Recommends best practices and optimizes the cluster for maximum performance.

This command makes or recommends the following best practices:

  • By default, if --memory-percentage is not specified, sets maximum_memory to either 90% of the total RAM available to a leaf or aggregator node, or to the total RAM available to the node minus 10 GB or minus 5 GB multiplied by number of nodes, whichever is greater.

  • If --memory-percentage is specified, sets maximum_memory to that percentage of the total RAM available to a leaf or aggregator node.

  • If the maximum_blob_cache_size_percent variable is set, checks that the total cache reserved by all leaf nodes does not exceed the disk size. Otherwise, sets maximum_blob_cache_size_mb to an optimal value.

  • If there are multiple leaf or aggregator nodes on the same host, the memory allocation will be divided evenly among the nodes of the same type.

  • If there are leaf and aggregator nodes on the host, 3/4 of the memory will be allocated to the leaf nodes and 1/4 of the memory will be allocated to the aggregator nodes.

  • Queries for the NUMA node count on the host. If numactl is installed on the host, optimize will set up the NUMA binding based on the number of NUMA nodes on the host and the number of leaf nodes created.

  • Deploying additional leaf nodes is recommended if the number of leaf nodes is less than what the NUMA configuration recommends.


memsqlctl optimize [flags]
--blob-cache-max-size Optimize the maximum_blob_cache_size_mb value for each leaf node (default true)
-h, --help Help for optimize
--memory-percentage INT The percentage of memory to use for the database on each host
--no-numa Do not change NUMA settings on any nodes
Global Flags:
-c, --config FILE_PATH Path to the memsqctl config file
--default-install-dir DIRECTORY_PATH Path to the default install directory
--insecure-ssl Fall back to insecure SSL connections to local SingleStoreDB nodes if memsqlctl is unable to otherwise establish a connection (ADVANCED)
-j, --json Print output in JSON format
--node-metadata-file FILE_PATH Path to the node metadata file
--parallelism POSITIVE_INTEGER Maximum amount of operations to be run in parallel
--ssl-ca FILE_PATH The path to the CA certificate file (in PEM format) to authenticate the database certificate
--timeout duration Maximum time for operation to complete (e.g., 30s, 10m, 1.5h)
--verbose-json Print output in JSON format, include some warnings and user messages
-v, --verbosity count Increase logging verbosity
-y, --yes Enable non-interactive mode and assume the user would like to move forward with the proposed actions by default


  • This command is interactive unless you use either --yes or --json flag to override interactive behavior.

  • The memsqlctl optimize command is equivalent to the sdb-admin optimize command.


The following example shows how to use optimize to increase memory size on a leaf node to align with deployment best practices.

sudo memsqlctl optimize
Warning: The maximum memory per node, 7184 MB, is less than SingleStore's minimum recommendation of 7372 MB per node.
memsqlctl will perform the following actions:
  · On leaf node with MemSQL ID 7DE9330A9F374C580C9857C851CE3A8380DA2FFC on port 3307
    - Set maximum_memory to 7184 MB

Would you like to continue? [y/N]: y
✓ Updated MemSQL config file with setting 'maximum_memory = 7184' for node with MemSQL ID 7DE9330A9F374C580C9857C851CE3A8380DA2FFC
✓ Executed 'SET GLOBAL maximum_memory=7184' command on node with MemSQL ID 7DE9330A9F374C580C9857C851CE3A8380DA2FFC

Last modified: August 3, 2023

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