List of Engine Variables
On this page
The following tables list the sync engine variables and non-sync engine variables.
When reading or setting engine variables keep in mind that the values ON and 1 are synonymous, as are the values OFF and 0.
Sync Variables Lists
See the engine variables overview to learn how sync variables work.
Note
All of the sync variables listed in the following table are global variables, except when noted as a session variable that can also be set globally
in the Description
column.
You can set sync variables on the master aggregator, only.Description
column in the following table.
|
Name |
Description |
Default |
|---|---|---|
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Shows a JSON array of users whose query runs are not considered active to measure the cluster's idle time. |
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Deprecated in MemSQL 6. |
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Allows modification of global variables even in the presence of computed shard keys. The behavior changing sysvars include:
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Determines whether to allow errors while consuming '/proc/cpuinfo' to append CPU flags to the code generation's hash. |
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Specifies if every audit log record is synchronously written and persisted to the disk. |
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Indicates the retention period (in days) for audit log files. |
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Specifies if the aggregator will try to attach a node automatically after it has been marked offline, but starts responding to heartbeats again. |
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Number of seconds a table's incremental autostats can go unused before being flushed to disk. |
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Number of seconds to wait after a new node has attached to the cluster before running a rebalance. |
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How often (in seconds) background statistics will check for out-of-date statistics (rowstore only). |
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Threshold as a fraction of table row count triggering the collection of autostats. |
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Determines if external functions are batched. |
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Deprecated. |
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Possible values are This variable can sync to all nodes, including aggregator and leaf nodes. This engine variable is configurable on SingleStore Helios. |
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Maximum frequency (in seconds) that change count metadata will be written. |
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The character set of the node. For more information, see Specifying Character Set and Collation for Clusters. |
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Sets the collation that is used on the node. For more information, see Specifying Character Set and Collation for Clusters. |
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Sets the collation that is used on the node. For more information, see Specifying Character Set and Collation for Clusters. |
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Sets the collation that is used on the node. For more information, see Specifying Character Set and Collation for Clusters. |
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Sends |
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At this threshold (fraction of |
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Controls the rowstore-backed segment size for columnstore tables. |
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Timeout (in seconds) to queue a columnstore ingest query before returning an error. |
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Sets the threshold at which multiple inserts to a columnstore table with unique keys will switch from row value lock to table lock. |
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Controls the maximum row count for a columnstore segment. |
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Verifies the checksum of a blob before merging it. |
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Determines whether consensus can be configured or not. |
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Generates a core if a file IO API encounters |
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Generates a core instead of throwing an error if a stack overflow occurs during query execution. |
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Limits the size of some critical diagnostics sent to SingleStore. |
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Specifies the level of data conversion behavior to use. This variable can sync to all nodes, including aggregator and leaf nodes. |
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See Row Locking. |
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Sets the default type of cardinality autostats for newly created columnstore tables. |
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Sets the default state for autostats sampling for newly created columnstore tables. |
l |
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Whether autostats is enabled by default on newly created tables. |
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Sets the default type of automatic histograms on newly created tables. |
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Sets the default type of cardinality autostats for newly created rowstore tables. |
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Sets a threshold for the number of rows that are locked before a table lock is acquired when updating or deleting rows in a columnstore table. |
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The time (in milliseconds) to wait for a distributed DDL transaction to commit. |
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The default number of partitions a newly created database will be created with. |
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A global variable used for MySQL compatibility. |
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The default table type to use when creating a new table. |
When you upgrade a cluster, the setting of the variable does not change. |
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Controls the default value for If it is enabled and Once it is turned on, it impacts only the newly created users. This variable can sync to all aggregators. |
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Controls pushdown logic of pushing down reference table clauses to the leaves. |
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Prevents the removal of |
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Whether merging subqueries are disabled if they contain This is a session variable that can also be set globally. |
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The interval in which a query plan must be read from disk (plancache directory) before it is removed. |
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Controls how long (in seconds) an aggregator caches a distributed transaction outcome. |
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Deprecated in MemSQL 6. |
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As of MemSQL 6. |
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At a high level, this variable makes the optimizer more (lower) or less (higher) likely to consider a broadcast when planning distributed joins. This is a session variable that can also be set globally. |
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This variable is deprecated but still exists for backward compatibility purposes. This variable can sync to all nodes, including aggregator and leaf nodes. |
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The minimum number of tables that must be present in a join for initial heuristics to be run before join optimization. This is a session variable that can also be set globally. |
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Enabling this variable will result in a return to pre-7. This is a session variable that can also be set globally. |
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The maximum number of tables present in a join that will result in an unrestricted search being performed to find the optimal query plan. This is a session variable that can also be set globally. |
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Allows the user to set the minimum amount of time to wait for Disaster Recovery (DR) replication in milliseconds (ms). This variable can sync to all nodes, including aggregator and leaf nodes. |
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Trims leading spaces for column name aliases. |
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Profile results are not collected automatically. Please note, a profiled query will have a different query plan than a non-profiled query. This variable can sync to all nodes, including aggregator and leaf nodes. |
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Controls whether the background statistics thread can invalidate plans automatically. |
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If set to |
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When this variable is set to |
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When this variable is set to |
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Enables queuing on columnstore ingest queries when the background flusher is behind. |
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Enable removal of stale on-disk plans from the plancache directory based on the value of |
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Retains human-readable query plan summaries for compiled query plans. |
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When set to |
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Allows the on-disk IR cache to be enabled or disabled. |
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When this variable is set to |
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Enables the forwarding of DDL queries from a child aggregator to the master. |
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Enables spilling onto disk for HashGroupBy operations during query processing.
The sync variables This variable can sync to all nodes, including aggregator and leaf nodes. |
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Enables tracing in backup subprocesses. |
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Enables compressing identical strings on |
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Uses heuristic or histogram to estimate missing sampling data instead of returning zero rows. |
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Specifies how SingleStore estimates the equality predicate for uncorrelated scalar subselects. This variable can sync to all nodes, including aggregator and leaf nodes. |
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Number of cpu cores expected on each leaf. |
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Specifies the maximum number of characters to be used by expressions when outputting the |
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Specifies whether the server disables certain nonstandard behaviors for default values and NULL-value handling in |
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Port number to use for prometheus exporter http endpoint. |
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Path to user CA file to use for prometheus exporter connection. |
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Path to user directory with CA files to use for prometheus exporter connection. |
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Provides the path to the ssl certificate. |
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If a node moves offline a second time after just failing and then coming back online failover won’t be triggered again if it happens within |
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Controls whether the cluster fails over if disk use falls below |
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Maximum number of tables in a join which SingleStore will still cost bushy joins. |
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The radius of the sphere is used for distance calculation, in meters. |
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This variable is the maximum length string This variable can sync to all nodes, including aggregator and leaf nodes. |
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The size of a block of characters used to logically divide up string columns when using the full-text search highlight functionality. |
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Maximum number of fragments to return from highlight function. |
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When this variable is set to |
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Specifies the maximum number of list values to consider during histogram estimation for a query with an This is a session variable that can also be set globally. |
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Amount of time (in seconds) the background thread waits before trying to flush on a table with data less than |
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Specifies the maximum number of nested common table expressions (CTEs). |
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The endpoint to get JWKS updates from. |
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The CA certificate file to be used for SSL JWKS endpoint host verification when HTTPS protocol is used. |
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The JWKS update interval in seconds. |
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Whether or not the master aggregator should detect leaf failures and trigger failovers. |
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Specifies the placement of replica partitions in a cluster. |
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Hides license-related variables from |
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The amount of time, in minutes, that a |
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If this variable is set to |
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Maximum number of unparsed bytes read by |
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Number of bytes read at a time by |
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Number of bytes written at a time by |
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Restricts access to the local file system. |
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Time (in seconds) to wait for a row lock before returning an error. |
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Determines whether to use the lockfree backup implementation that is introduced in version 7. |
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Specifies the log file size (in bytes) for partitions. |
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Specifies the log file size (in bytes) for reference databases. |
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The number of compiles that can run asynchronously at a given time on each node, when This variable can sync to all nodes, including aggregator and leaf nodes. |
Half the number of cores on the host machine. |
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The maximum amount of memory (in megabytes) used to compile a query. |
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The maximum time allowed (in seconds) to compile a query. |
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If the number of interrupted connections from a host exceeds the value of |
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Sets the maximum number of threads to use for pre-fetching per scan. |
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Sets the maximum number of simultaneous prepared statements. |
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Displays the version of SingleStore initially installed. |
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Indicates the size (in bytes) of the SingleStore database log upon which a new snapshot will be kicked off. |
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The period in minutes to keep historical monitoring data. |
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Preferred number of tuples in multi-inserts that aggregators send to leaves. |
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Time (in seconds) that is allowed for a multi-statement transaction to remain idle while holding locks. |
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Controls the number of threads per leaf node for parallel columnstore scans. |
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Variable to write default |
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A statement count threshold for a procedure or function. |
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Controls the beam search width. |
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Setting this to |
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Sets a threshold for the number of empty tables that must be present in a query before the optimizer falls back to being rule-based, instead of cost-based. |
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The maximum number of scalar constants a single query can contain. |
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The interval in which a query plan must be reused at least once or it gets unloaded from the query plan cache. |
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A global variable that preserves This variable can sync to all nodes, including aggregator and leaf nodes. |
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The maximum number of bytes available to the |
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Default timeout (in milliseconds) to wait for a |
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This variable is deprecated. Maximum number of simultaneous running queries. |
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Serializes query shape metadata to disk. |
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Maximum size (in bytes) for each query shape in a serialization file. |
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Stores actual parameter values to on-disk query shape metadata serialization. |
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If |
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If set to 1, there is no redundancy across leaves. |
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Specifies the heap allocation limit of the regexp compiler (in megabytes). |
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Specifies the regular expression format to be used by regular expression functions that you call. |
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Determines whether the mode of control over the |
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The function that is executed at runtime that selects the resource pool to use when the user runs a query. For more information on this variable, see the Setting Resource Limits topic. |
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Sets the lifetime (in seconds) of a result table error before garbage collection. |
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Displays the service edition: |
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Adds conditional compatibility comments to outputs like |
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Maximum number of tables present in a join which will utilize the cost-based singlebox join optimizer. This is a session variable that can also be set globally. |
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The aggregate size of transaction logs (in bytes) which, when reached, will trigger a new snapshot. |
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Specifies how much time (in seconds) to wait between snapshots before taking a snapshot for blob garbage collection from previous snapshots. |
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Number of snapshot and log files to keep for backup and replication. |
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Specifies whether different query plans are generated for This variable can sync to all aggregators. |
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Memory threshold (ratio of total node memory, 0 - 1) to start spilling. |
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Memory threshold (bytes) for a query operator to be considered for spilling. |
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The maximum number of rows returned by a |
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Makes subprocess errors easier to read. |
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This engine variable is deprecated. |
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The maximum number of retries for |
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The maximum amount of time (in milliseconds) the engine waits for or retries a request before timing out to return metadata used to verify the cluster is on ec2 from which implicit credentials can be obtained. |
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The maximum amount of time (in milliseconds) the engine waits for or retries a request before timing out and failing the backup when connecting to cloud providers. |
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This session variable fine-tunes the behavior of the rewrite If the variable is set to This variable can sync to all nodes, including aggregator and leaf nodes. |
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This aggregator will synchronize its permissions with other aggregators. |
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This engine variable is deprecated. |
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Sets the case-sensitivity for database object names. |
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Transaction isolation level. This engine variable is configurable on SingleStore Helios. |
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Transaction isolation level. This engine variable has been deprecated. |
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Determines whether |
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This variable has been deprecated and is no longer operational in SingleStore version 5. |
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Controls how much time (in milliseconds) a transaction waits on a rowlock before giving up when the decision is "die". This variable can sync to all nodes, including aggregator and leaf nodes. |
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Specifies the cluster name used by the backup. |
JSON Sync Variables
|
Name |
Description |
Default |
|---|---|---|
|
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Controls whether the |
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Password Complexity Sync Variables
For information about how to configure a password complexity policy, see Configuring a Password Policy.
|
Name |
Description |
Default |
|---|---|---|
|
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The maximum number of consecutive repeated characters allowed ( |
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The maximum number of consecutive characters allowed ( |
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The minimum number of characters required ( |
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The minimum number of lowercase characters required ( |
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The minimum number of numeric digit characters required ( |
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The minimum number of special (non-alphanumeric) characters required ( |
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The minimum number of uppercase characters required ( |
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Pipelines Sync Variables
You cannot set a variable for a specific pipeline – each variable setting applies to all pipelines in the cluster.
|
Name |
Description |
Default |
|---|---|---|
|
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Specifies whether to enable security features for HDFS pipelines. |
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Allows custom java pipelines. |
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Implements an extractor interface used for experimental Java pipelines. |
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Heap size (in megabytes) for HDFS pipelines. |
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The number of batch metadata entries to persist per partition, per pipeline before they are overwritten by incoming batches. This variable can sync to all nodes, including aggregator and leaf nodes. |
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For keyless sharded destination tables, if less than this fraction of batch partitions are active, reshuffle to avoid skew. |
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The amount of time in minutes that a pipeline error is stored on disk. This variable can sync to all nodes, including aggregator and leaf nodes. |
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Generates core dumps on pipeline extractor operations that timeout. |
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Specifies whether to enable extractor debugging for Kafka or HDFS pipelines. |
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The maximum time (in milliseconds) to wait for offset data to be returned from the data source before returning an error. This variable can sync to all aggregators. |
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The maximum time (in milliseconds) that a pipeline will wait for more data from an external source. |
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Maximum memory of a pipeline extractor (in megabytes). |
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Max number of files that will be garbage collected in one iteration. |
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The Kafka version used for the Kafka extractor. This variable is not applicable to current (>= 0. For legacy Kafka, |
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The maximum number of pipelines running concurrently. |
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The maximum number of pipeline batch partitions running concurrently. This variable can sync to all nodes, including aggregator and leaf nodes. |
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Deprecated in MemSQL 6. This variable can sync to all nodes, including aggregator and leaf nodes. |
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The maximum number of data source partition offsets to extract in a single batch transaction. This variable applies only to Kafka pipelines. This variable can sync to all aggregators. |
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Max pooled extractors for Kafka pipelines. |
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The number of retry attempts for writing batch partition data to the destination table. This variable can sync to all aggregators. |
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Amount of time in minutes allowed for pipeline metadata timestamp skew. |
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Max number of batches for a pooled extractor for Kafka pipelines. |
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The buffer size for standard error output (in bytes). This variable can sync to all nodes, including aggregator and leaf nodes. |
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Specifies whether or not each pipeline in the cluster should stop when an error occurs. This variable can sync to all aggregators. |
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If set to This variable can sync to all aggregators. |
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Unlimited Storage Database (Bottomless) and Point-in-Time Restore Variables
|
Name |
Description |
Default |
|---|---|---|
|
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Controls the maximum number of threads available for downloading blobs from unlimited storage. |
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Sets the timeout, in milliseconds, for CURL HTTP requests made by the unlimited storage cloud API (AWS/Azure). |
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Specifies the amount of time, in minutes, a restore point for a remote storage database is retained after it is created. This variable can sync to all nodes, including aggregator and leaf nodes. |
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Number of milliseconds elapsed between unlimited storage uploads. |
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Maximum size (in bytes) an unlimited storage download's buffer can grow to. |
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Skips API checks when creating a new bottomless database. |
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Determines how often snapshot files are uploaded to the object store. This variable can sync to all nodes, including aggregator and leaf nodes. |
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A higher value can increase the concurrency of uploading data updates made on the cluster to the object store. This variable can sync to all nodes, including aggregator and leaf nodes. |
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Amount of lag (in seconds) after which all columnstore ingest is throttled, subject to This variable can sync to all nodes, including aggregator and leaf nodes. |
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Minimum disk space when an unlimited storage columnstore ingest kicks in. This variable can sync to all nodes, including aggregator and leaf nodes. |
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Amount of lag (in seconds) after which some columnstore ingest may be throttled, subject to This variable can sync to all nodes, including aggregator and leaf nodes. |
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Workload Management Sync Variables
|
Name |
Description |
Default |
|---|---|---|
|
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Whether to train or enable the resource usage model for workload management. This variable can sync to all aggregators. |
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Specifies whether to enable workload management for the cluster. This variable can sync to all aggregators. |
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Sets the ratio of the available leaf memory for workload_ |
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Enables/disables the dynamic reuse of WM queues feature. |
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Enables static resource partitioning for deterministic behavior by workload management. |
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The maximum number of connections to use per leaf node in the cluster. |
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The maximum depth of the query queue, which is the maximum number of queries that can be queued. This variable can sync to all aggregators. |
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The maximum number of threads to use per leaf. |
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Percentage of memory a query can use before it will get queued. This variable can sync to all aggregators. |
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Whether to turn on queuing based on memory usage of queries. |
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Workload management contains two queues for execution and depending on the amount of resources required for query execution, a query will be in one of the two available queues (MEDIUM or LARGE). This variable can sync to all aggregators. |
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Specifies when a warning will appear based on the ratio of time spent by a query in the queue versus the actual execution time of the query. This variable can sync to all aggregators. |
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The time duration (in seconds) after which a query times out and is removed from the queue without being executed. This variable can sync to all aggregators. |
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Non-Sync Variables List
See the engine variables overview to learn how non-sync variables work.
Note
All of the non-sync variables listed in the following table are global variables, except when noted as a session variable that can also be set globally
in the Description
column.
The variables listed in the following tables can be set to take effect on node startup and can be set to take effect while the node is running.
Basic Variables
|
Name |
Description |
Default |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
|
Defines the IP address to use to listen for incoming connections. If the address is 0. |
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You can only set this variable while the node is offline. |
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|
Directory path for the data directory. |
You can only set this variable while the node is offline. |
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The number of digits by which to increase the scale of division results performed with the division (/) operator. |
|
You can set this variable but it is currently not supported in SingleStore. |
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If |
|
You can only set this variable while the node is offline. |
|
|
Appending |
You can only set this variable while the node is offline. |
|
|
|
Specifies the maximum blob cache size per leaf node.
|
Version <=7. For disk range 0-40GB, cache value is 100% of disk. For disk range 40GB+, cache value is 80% of disk.
Version =>8. For disk range 0-40GB, cache value is 100% of disk. For disk range 40-140GB, cache value is 40GB. For disk range 140-666GB, cache value is 75% of disk. For disk range 667GB+, cache value is 90% of disk - 100GB. |
|
|
|
Maximum memory SingleStore will use, in MB. |
90% of System RAM or System RAM minus 10 GB, whichever is greater |
You are required to restart a node only when the variable is being reduced. |
|
|
Maximum memory SingleStore will use for table storage, in MB. |
If |
You are required to restart a node only when the variable is being reduced. |
|
|
SingleStore port number. |
|
You can only set this variable while the node is offline. |
|
|
The hostname or IP of the machine in use. |
||
|
|
Directory path for the plancache directory. |
|
You can only set this variable while the node is offline. |
|
|
Directory path for the tracelogs directory. |
|
You can only set this variable while the node is offline. |
Connection Management Variables
|
Name |
Description |
Default |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
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The number of seconds the node’s SingleStore waits for a connection packet before sending back a |
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|
|
Maximum allowed protocol packet size (in bytes). |
|
You can only set this variable while the node is offline. |
|
|
The number of simultaneous clients allowed. |
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|
|
The maximum number of kernel threads for processing queries. |
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|
|
Specifies the number of connections reserved for admin users (users granted the You connect via a socket file, for example: Refer to the Dedicated Admin Connections page for how to create dedicated admin connections. |
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|
|
The maximum number of stashed connections per leaf. |
|
You can only set this variable while the node is offline. |
|
|
Controls whether to perform name resolution. |
|
You can only set this variable while the node is offline. |
Database Optimization Variables
|
Name |
Description |
Default |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
|
Deprecated alias to |
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|
|
This variable has been deprecated and is no longer operational in SingleStore. |
||
|
|
Whether to merge the newly loaded data segments (for |
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|
|
Number of seconds an online failover will wait to drain open idle write transactions before issuing a kill to those transactions. |
|
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|
|
Number of seconds to wait for more data from a connection before aborting the read. |
|
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|
|
Number of seconds to wait for a block to be written to a connection before aborting the write. |
|
|
|
|
This variable has been deprecated and is no longer operational in SingleStore. |
||
|
|
This variable has been deprecated and is no longer operational in SingleStore. |
Logging Variables
|
Name |
Description |
Default |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
|
Turning |
|
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|
|
Sends usage and critical error diagnostics to SingleStore. |
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If set to |
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Log connections and queries to a given file. |
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Defines how SingleStore behaves when it encounters unsupported functionality. |
|
Password Complexity Non-Sync Variables
|
Name |
Description |
Default |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
|
Specifies whether the root password can expire. |
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The time (in seconds) before a password expires. |
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The number of previous passwords per user that SingleStore will store and disallow from reuse. |
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Pipelines Non-Sync Variables
You cannot set a variable for a specific pipeline – each variable setting applies to all pipelines in the cluster.
|
Name |
Description |
Default Setting |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
|
Specifies the value that SingleStore sets the node’s operating system environment variable |
You can only set this variable while the node is offline. |
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Specifies the path that the HDFS extractor uses to run Java. |
Security Variables
|
Name |
Description |
Default |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
|
When this variable is set to |
|
You can only set this variable while the node is offline. |
|
|
CA file to be used for SSL connections. |
You can only set this variable while the node is offline. |
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CA directory to be used for SSL connections. |
You can only set this variable while the node is offline. |
|
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|
Certificate file to be used for SSL connections. |
You can only set this variable while the node is offline. |
|
|
|
Cipher to be used for SSL/TLS connections. You must manually enumerate all desired cipher suites. For example: ssl_ This will enable only the enumerated cipher suites in both the SingleStore engine and websocket proxy. |
You can only set this variable while the node is offline. |
|
|
|
When this variable is set to |
|
You can only set this variable while the node is offline. |
|
|
Public-private key pair file to be used for SSL connections. |
You can only set this variable while the node is offline. |
|
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|
Passphrase for encrypted |
You can only set this variable while the node is offline. |
Other Variables
|
Name |
Description |
Default |
Exceptions to When Variable can be Set |
|---|---|---|---|
|
|
Enables support for filesystems without |
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|
Specifies the local or network directory to write log files. |
|
You can only set this variable while the node is offline. |
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|
You can only set this variable while the node is offline. |
|
|
Specifies the maximum size per log file (in bytes). |
|
You can only set this variable while the node is offline. |
|
|
Specifies the maximum time duration to write to a single log file (in seconds). |
|
You can only set this variable while the node is offline. |
|
|
If Note: If |
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Specifies the maximum number of concurrent threads, per leaf, used to run a backup on each leaf. The number of threads, if set, is shared among active backups, with the first backup using as many as it needs. |
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|
Specifies the path where the installation directory can be found. |
You can only set this variable while the node is offline. |
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|
This variable exists for backwards compatibility with MySQL. |
||
|
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If |
|
You cannot set this variable while the node is offline. |
|
|
When this variable is set as |
|
You can only set this variable while the node is offline. |
|
|
Specifies the type of core dump to generate if SingleStore terminates abnormally. |
|
You can only set this variable while the node is offline. |
|
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This is a configuration variable that is used to set the time zone on a host by specifying an offset from UTC time. |
||
|
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This variable has been deprecated and is no longer operational in SingleStore version 5. |
||
|
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The local path to the keytab file created on the KDC. |
You can only set this variable while the node is offline. |
|
|
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The SPN for SingleStore that was created on the KDC. |
You can only set this variable while the node is offline. |
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Speficies the server hostname at startup. |
||
|
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Enables SingleStore's Data API endpoints on the built-in HTTP server when used in conjunction with the |
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Specifies the maximum number of connections each pool can have open at any point in time when using the SingleStore's Data API. |
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Specifies the maximum number of idle connections to retain in each connection pool when using the SingleStore's Data API. |
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Specifies the port on which the WebSocket proxy should run. The Note: This variable is mutually exclusive with the |
||
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Specifies the port on which WebSocket proxy should run. The Note: This variable is mutually exclusive with the |
||
|
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Idle threads terminate after the specified number of seconds. |
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|
|
Contains the value of |
You cannot set this variable while the node is offline. |
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|
|
If set to |
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|
If set to |
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|
|
Controls whether SingleStore compiles or interprets query plans. |
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|
|
Controls the maximum length (in bytes) of JSON_ |
|
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|
|
This variable has been deprecated and is no longer operational in SingleStore. |
||
|
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Specifies the directory where error messages are stored. |
|
You can only set this variable while the node is offline. |
|
|
This variable has been deprecated and is no longer operational in SingleStore version 5. |
||
|
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Specifies the setting to materialize the common table expressions (CTEs).
This engine variable is experimental and should not be enabled in production. For more information, see WITH (Common Table Expressions). |
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The ID of the SingleStore node whose config you would like to update. |
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|
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SingleStore version number. |
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The build date of the SingleStore version currently running. |
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|
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SingleStore version hash. |
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Sets the minimal available disk space allowed (in megabytes). |
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Specifies the size (in bytes) of the connection buffer and the result buffer with which each client thread starts. |
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The path name of the process ID file. |
|
You can only set this variable while the node is offline. |
|
|
This variable enables the collection of additional data with |
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Specifies the version of the client/server protocol. |
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The number of threads pooled for replication management of reference databases. |
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The number of threads pooled for replication management of partition databases. |
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|
Specifies the resource pool to be used. |
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|
This variable determines verbose debug tracing for rewrites. |
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Number of threads running for rowstore garbage collection. |
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|
Specifies a single audience restriction for the SAML assertion. For more information on this variable, see Configuring SAML Global Variables. |
You can only set this variable while the node is offline. |
|
|
|
Specifies the intended recipient for a wrapped encryption key. For more information on this variable, see Configuring SAML Global Variables. |
You can only set this variable while the node is offline. |
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|
Specifies the file path for the private key used to decrypt an encrypted assertion. For more information on this variable, see Configuring SAML Global Variables. |
You can only set this variable while the node is offline. |
|
|
|
Specifies if authentication should fail when both the SAML response and SAML assertion are unencrypted. For more information on this variable, see Configuring SAML Global Variables. |
|
You can only set this variable while the node is offline. |
|
|
Specifies if authentication should fail when both the SAML response and SAML assertion are unsigned. For more information on this variable, see Configuring SAML Global Variables. |
|
You can only set this variable while the node is offline. |
|
|
Specifies whether a username value should be extracted from the For more information on this variable, see Configuring SAML Global Variables. |
|
You can only set this variable while the node is offline. |
|
|
Specifies the username attribute in a SAML assertion that should be used to determine if a user exists in the database. For more information on this variable, see Configuring SAML Global Variables. |
You can only set this variable while the node is offline. |
|
|
|
Specifies the file path for the identity provider’s public x509 signing certificate. For more information on this variable, see Configuring SAML Global Variables. |
You can only set this variable while the node is offline. |
|
|
|
Specifies the directory to which any import or export operations should be limited, or |
You can only set this variable while the node is offline. |
|
|
|
Specifies the Unix socket file to use for local connections. |
|
You can only set this variable while the node is offline. |
|
|
If the node's disk space (in MBs) is less than |
|
|
|
|
If |
|
|
|
|
System time zone. |
|
|
|
|
This variable has been deprecated and is no longer operational in SingleStore version 5. |
||
|
|
Specifies how many inactive connection threads should be cached. |
|
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|
|
Determines how the server handles connection threads. |
|
You can only set this variable while the node is offline. |
|
|
Specifies the stack size (in bytes) for each thread. The value must be between 131072 and 134217728, and also evenly divisible by 1024. |
|
You can only set this variable while the node is offline. |
|
|
The current time zone. |
|
|
|
|
Used to capture the original timestamp of the client. |
|
|
|
|
Indicates the TLS version with which to configure the node. |
You can only set this variable while the node is offline. |
|
|
|
MemSQL Ops writes temporary data to |
You can only set this variable while the node is offline. |
|
|
|
The type of the server binary. |
|
|
|
|
The operating system on which SingleStore was built. |
|
In-Depth Variable Definitions
This section contains supplemental information about engine variables that require more understanding to configure properly.
max_
max_ is the maximum number of kernel-level threads the SingleStore node will use to handle connections (i.max_ setting on an aggregator is essentially a limit on the number of queries - including internal SingleStore queries - the aggregator will run simultaneously.
The maximum value of max_ is 12192.
If the max_ limit is reached on an aggregator, queries are queued until a thread becomes available, which can potentially cause unresponsiveness, latency spikes, and failures.max_ limit is reached on an aggregator, increasing the limit should solve the problem.
max_
max_ is the maximum number of connections cached between nodes.max_ is reached.SHOW PROCESSLIST on a leaf that has been running a workload will show both open and idle connections.
The default value is 1024, which is typically sufficient.
max_
max_ is the maximum number of connections that can be open to a SingleStore node at one time.max_ as lowering its value would not impact resource allocation.
node_
Sets the per-node degree of parallelism for applicable query operators.0 the parallelism is chosen automatically (i.
When node_ is set to a value other than 0, say n, then n processor threads are started on each leaf node to handle all the partitions on that leaf.
interpreter_
Controls both whether and how SingleStore compiles or interprets query plans.
-
llvmorcompile: Queries are compiled to machine code.compileis an alias forllvm. -
mbcorinterpret: Queries are interpreted and not compiled.interpretis an alias formbc. -
interpret_: Queries start out as interpreted and dynamically switch to compiled during the first query execution.first This mode can help improve ad-hoc query performance. The interpret_mode is turned on by default and can be used in production deployments.first
This variable can also be set as a query option by adding OPTION (interpreter_ at the end of the query.interpreter_ is non-operational on the leaf node since it is forwarded from the aggregator to the leaf.
For more information on interpreter_ and query compilation behavior, see Code Generation.
sp_
Syntax
SET GLOBAL sp_query_dynamic_param = {ON | OFF};
Remarks
When set to ON, sp_ changes the plan generation behavior as follows:
-
Calls to a stored procedure use the same plan, regardless of whether the arguments to the procedure are
NULLor notNULL.For example, the following procedure calls use the same plan: CALL proc_test(1, NULL, 7);CALL proc_test("Adam", NULL, 4);CALL proc_test(NULL, "Sam", "Smith");The following procedure calls use different query plans, because of different number of arguments:
CALL proc_test(NULL);CALL proc_test(NULL, 7); -
All occurrences of a query, inside a stored procedure, that uses variables will use the same plan, regardless of whether the variable values are
NULLor notNULL.This applies when such a query appears in the stored procedure multiple times or when the query runs repeatedly via multiple calls to the stored procedure.
When sp_ is enabled, compilation time and plancache size are reduced.
Note
The OFF setting of sp_ disables the plan generation behavior described above.
Example: Changes in Type Conversion Behavior
A query returns different results for cases where an invalid conversion is being done, depending on the value of sp_.TIME data type.
If sp_ is disabled,
DELIMITER //CREATE OR REPLACE PROCEDURE sp_ex (t TIME) ASBEGINECHO SELECT t AS "t";END; //DELIMITER ;CALL sp_ex(9006060);
+-----------+
| t |
+-----------+
| 838:59:59 |
+-----------+If sp_ is enabled,
DELIMITER //CREATE OR REPLACE PROCEDURE sp_ex (t TIME) ASBEGINECHO SELECT t AS "t";END; //DELIMITER ;CALL sp_ex(9006060);
+----------+
| t |
+----------+
| 00:00:00 |
+----------+json_
json_ allows you to control the collation of JSON_ output.
-
json: Specifies that the result will use the collation of the JSON argument.If the collation of the argument is not set, the default ( utf8_) is used.bin -
Since the old
AUTO/SERVERbehavior is error-prone, existing customers should set this engine variable toSERVER_immediately after upgrading.V2 See the support bulletin: Using the JSON utf8mb4 Column. . . -
server/auto: Specifies that the collation result will be the same as collation of the server defined by thecollation_variable.server Generally, this value is utf8_.general_ ci -
SERVER_: Functions the same as server/auto, in previous version older than 7.V1 8. 21 but without the parser lockdown. -
SERVER_: When theV2 collation_isserver utf8and the JSON object isutf8mb4, the output will useutf8mb4.This is the default beginning with version 7. 8. 21
skip_
skip_ controls whether the server performs name resolution via DNS lookup upon login.
-
AUTO: By default,AUTOwill only perform a reverse DNS lookup if there are any host-based security rules. -
OFF: Always uses name resolution.This is not recommended without a reliable existing DNS. -
ON: Disables DNS and never uses name resolution.The server matches only IP addresses (not host names) to the list of grants. This can improve performance for users with a slow DNS and many hosts.
sql_
sql_ specifies the current SQL mode (or modes) that the current session runs in.
-
ANSI_: ChangesQUOTES "to be treated as the identifier quote character (like the ` quote character) and not as a string quote character.You can still use ` as an identifier quote character with this mode enabled. With ANSI_enabled, you cannot use double quotation marks to quote literal strings because they are interpreted as identifiers.QUOTES -
ANSI: Setssql_tomode STRICT_,ALL_ TABLES ONLY_,FULL_ GROUP_ BY PIPES_, andAS_ CONCAT ANSI_together.QUOTES -
NO_: If you grant privileges to a non-existing user, the user will be created automatically unlessAUTO_ CREATE_ USER NO_is specified inAUTO_ CREATE_ USER sql_.mode -
ONLY_: Throws an error when fields in theFULL_ GROUP_ BY SELECTlist,HAVINGcondition, orORDER BYlist are not in aGROUP BYclause, or are outside of an aggregate function.This is because the result set could include multiple possible values for the non-grouped, non-aggregated field. -
PIPES_: ChangesAS_ CONCAT ||to be treated as string concatenation operation and not as an OR operation.You can still use built-in function CONCATas a string concatenation with this mode enabled. -
STRICT_: Always enabled, regardless of other modes being enabled or not.ALL_ TABLES If set to an empty value, behavior is the same as if STRICT_is set.ALL_ TABLES
Example
The following examples show how to set sql_ with one more or more values.
SELECT @@sql_mode;
+-------------------+
| @@sql_mode |
+-------------------+
| STRICT_ALL_TABLES |
+-------------------+
1 row in set (0.00 sec)-- Set sql_mode to include ONLY_FULL_GROUP_BYSET sql_mode = 'ONLY_FULL_GROUP_BY';SELECT @@sql_mode;
+--------------------------------------+
| @@sql_mode |
+--------------------------------------+
| ONLY_FULL_GROUP_BY,STRICT_ALL_TABLES |
+--------------------------------------+
1 row in set (0.01 sec)-- Set sql_mode to ANSI_QUOTES, which replaces ONLY_FULL_GROUP_BYSET sql_mode = 'ANSI_QUOTES';SELECT @@sql_mode;
+-------------------------------+
| @@sql_mode |
+-------------------------------+
| ANSI_QUOTES,STRICT_ALL_TABLES |
+-------------------------------+
1 row in set (0.00 sec)-- Set ONLY_FULL_GROUP_BY and ANSI_QUOTES togetherSET sql_mode = 'ONLY_FULL_GROUP_BY,ANSI_QUOTES';SELECT @@sql_mode;
+--------------------------------------------------+
| @@sql_mode |
+--------------------------------------------------+
| ANSI_QUOTES,ONLY_FULL_GROUP_BY,STRICT_ALL_TABLES |
+--------------------------------------------------+
1 row in set (0.01 sec)ssl_
The passphrase specified with ssl_ is used to decrypt the encrypted Privacy Enhanced Mail (PEM) or Password Protected (PASS) file.memsql. file and can used for both intra-cluster and inter-cluster configuration.
Last modified: August 30, 2024