SingleStoreDB v8.1

SHOW PLANCACHE

Shows all query statements that SingleStoreDB has compiled and executed, as well as cumulative query execution statistics associated with each plan.

Syntax

SHOW PLANCACHE

Remarks

SHOW PLANCACHE is a SingleStoreDB extension (it doesn’t exist in MySQL).
All counters shown by SHOW PLANCACHE are cleared when SingleStoreDB is restarted.
This command can be run on any SingleStoreDB node (see Node Requirements for SingleStoreDB Commands).
See the Permission Matrix for the required permission.

Output

Column	Description
`Database`	Context database selected with `USE <db_name>` when query was compiled.
`QueryText`	Query text with all numeric and string parameters replaced by tags (depending on parameter and/or query type). `@` is used for integers and `^` for string parameters. `?` is always used for INSERT queries.
`PlanID`	ID of the plan.
`PlanType`	Plan type, interpreted or compiled.
`Commits`	Number of successful executions of the query.
`Rollbacks`	Number of unsuccessful executions of the query (i.e. if the query was aborted or it encountered runtime errors).
`RowCount`	Cumulative number of rows returned by a `SELECT` query or the cumulative number of rows inserted, updated, or deleted for an `INSERT`, `UPDATE`, or `DELETE` query.
`ExecutionTime`	Cumulative time (in milliseconds) spent executing the query.
`AverageExecTime`	Average plan execution time.
`LogBufferTime`	NULL for `SELECT` queries, otherwise the cumulative time (in milliseconds) spent waiting to reserve space in the transaction buffer for this query. A larger transaction buffer and faster disk can help reduce it.
`LogFlushTime`	NULL for `SELECT` queries, otherwise the cumulative time (in milliseconds) spent waiting until changes made by this query are flushed to disk. A faster disk can help reduce it.
`RowLockTime`	NULL for `SELECT` queries, otherwise the cumulative time (in milliseconds) spent waiting to acquire exclusive row locks.
`StreamedRows`	(Cluster Only) Cumulative number of rows streamed from leaves and processed by the `SELECT` query.
`LeafNetworkTime`	(Cluster Only) Cumulative time (in milliseconds) spent waiting for results from leaves. This includes the time spent executing queries on the leaves.
`QueuedTime`	Query queued time.
`LastExecuted`	Query last execution time.
`CpuTime`	The amount of CPU time, in milliseconds, spent executing the query.
`AverageMemoryUse`	The average amount of memory used to execute this query. Any temporary memory allocation needed to execute a query including those for hash tables, sorts, result tables, etc. is tracked here.
`PlanWarnings`	Any warnings associated with the plan.
`AverageMaxMemoryUse`	This is the maximum memory use of each run, averaged across all runs of the same query plan.
`WorkloadManagementQueuedTime`	The amount of time, in milliseconds, a given query spent queued by Workload Management.
`ResourcePoolQueuedTime`	The amount of time, in milliseconds, a given query spent queued by Resource Governance.
`MplPath`	The path to the plan files on disk.
`FirstLoadTime`	The timestamp at which a query was first created or loaded from disk.
`OptimizerNotes`	Information about the query plan used by the optimizer, in JSON format.
`AverageDiskSpillingUse`	The average amount of data, in bytes, spilt to disk during query execution.

The OptimizerNotes column may contain the following information:

table_row_counts: Table row counts and other statistics.
prospective_histograms: Queries in the plancache that could have made use of histograms.
num_broadcasts, num_reshuffles: Number of broadcasts or reshuffles in the plan.
is_single_partition: Value is true for a single partition; otherwise, false.
average_leaf_memory, average_runtime: Average memory usage by leaf and average query runtime statistics collected by Workload Management.
num_broadcasts, num_reshuffles: Number of broadcasts or reshuffles in the plan.
Note
SingleStoreDB returns -1 for num_reshuffles and num_broadcasts when the workload manager is not managing (or tracking) the query based on the number of connections (or threads).
For example:
```
---
"LogBufferTime": 0,
"LogFlushTime": 0,
"OptimizerNotes": "{\"num_broadcasts\": -1, \"num_reshuffles\": -1, \"is_single_partition\": false, \"average_leaf_memory\": 0, \"average_runtime\": 0}",
"PlanId": 57080,
"PlanType": "LLVM",
"PlanWarnings": "",
---
```

Example

SHOW PLANCACHE;
****
+--------------------+----------------------------------+--------+----------+---------+-----------+----------+---------------+-----------------+---------------+--------------+-------------+--------------+-----------------+------------+---------------------+------------------+--------------+-------------------------------------------------------------------------------------------------------------------------+---------+---------------------+
| Database           | QueryText                        | PlanId | PlanType | Commits | Rollbacks | RowCount | ExecutionTime | AverageExecTime | LogBufferTime | LogFlushTime | RowLockTime | StreamedRows | LeafNetworkTime | QueuedTime | LastExecuted        | AverageMemoryUse | PlanWarnings | OptimizerNotes                                                                                                          | CpuTime | AverageMaxMemoryUse |
+--------------------+----------------------------------+--------+----------+---------+-----------+----------+---------------+-----------------+---------------+--------------+-------------+--------------+-----------------+------------+---------------------+------------------+--------------+-------------------------------------------------------------------------------------------------------------------------+---------+---------------------+
| information_schema | SELECT @@memsql_id               |      0 | LLVM     |       4 |         0 |        4 |           347 |              86 |          NULL |         NULL |        NULL |            0 |               0 |          0 | 2019-07-01 13:33:15 |            84237 |             | {"num_broadcasts": 0, "num_reshuffles": 0, "is_single_partition": true, "average_leaf_memory": 0, "average_runtime": 0} |       9 |              131072 |
| information_schema | SELECT @@memsql_version          |      1 | LLVM     |       1 |         0 |        1 |           157 |             157 |          NULL |         NULL |        NULL |            0 |               0 |          0 | 2019-07-01 13:33:15 |           130681 |              | {"num_broadcasts": 0, "num_reshuffles": 0, "is_single_partition": true, "average_leaf_memory": 0, "average_runtime": 0} |      13 |              131072 |
|                    | select @@version_comment limit @ |      2 | LLVM     |       1 |         0 |        1 |           558 |             558 |          NULL |         NULL |        NULL |            0 |               0 |          0 | 2019-07-01 13:33:23 |           130987 |              | {"num_broadcasts": 0, "num_reshuffles": 0, "is_single_partition": true, "average_leaf_memory": 0, "average_runtime": 0} |       9 |              131072 |
+--------------------+----------------------------------+--------+----------+---------+-----------+----------+---------------+-----------------+---------------+--------------+-------------+--------------+-----------------+------------+---------------------+------------------+--------------+-------------------------------------------------------------------------------------------------------------------------+---------+---------------------+

In this section:

SHOW PLANCACHE

Syntax

Remarks

Note

Example

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