Performance Schema System Variables

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The following variables are used with MariaDB's Performance Schema. See Performance Schema Options for Performance Schema options that are not system variables. See Server System Variables for a complete list of system variables and instructions on setting them.

See also the Full list of MariaDB options, system and status variables.

performance_schema

  • Description: If set to 1 (0 is default), enables the Performance Schema
  • Commandline: --performance-schema=#
  • Scope: Global
  • Dynamic: No
  • Data Type: boolean
  • Default Value: OFF (>= MariaDB 10.0.12), ON (<= MariaDB 10.0.11)

performance_schema_accounts_size


performance_schema_digests_size


performance_schema_events_stages_history_long_size


performance_schema_events_stages_history_size


performance_schema_events_statements_history_long_size


performance_schema_events_statements_history_size


performance_schema_events_transactions_history_long_size

  • Description: Number of rows in events_transactions_history_long table. Use 0 to disable, -1 for automated sizing.
  • Commandline: --performance-schema-events-transactions-history-long-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1
  • Range: -1 to 1048576
  • Introduced: MariaDB 10.5.2

performance_schema_events_transactions_history_size

  • Description:Number of rows per thread in events_transactions_history. Use 0 to disable, -1 for automated sizing.
  • Commandline: --performance-schema-events-transactions-history-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1
  • Range: -1 to 1024
  • Introduced: MariaDB 10.5.2

performance_schema_events_waits_history_long_size

  • Description: Number of rows contained in the events_waits_history_long table. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-events-waits-history-long-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1 (>= MariaDB 10.0.12), 100 (<= MariaDB 10.0.11)
  • Range: -1 to 1048576

performance_schema_events_waits_history_size

  • Description: Number of rows per thread contained in the events_waits_history table. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-events-waits-history-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1 (>= MariaDB 10.0.12), 5 (<= MariaDB 10.0.11)
  • Range: -1 to 1024

performance_schema_hosts_size

  • Description: Number of rows stored in the hosts table. If set to zero, no connection statistics are kept for the hosts table. -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-hosts-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1 (>= MariaDB 10.0.12), 20 (<= MariaDB 10.0.11)
  • Range: -1 to 1048576
  • Introduced: MariaDB 10.0.0

performance_schema_max_cond_classes

  • Description: Specifies the maximum number of condition instruments.
  • Commandline: --performance-schema-max-cond-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 90 (>= MariaDB 10.5.1), 80 (<= MariaDB 10.5.0)
  • Range: 0 to 256

performance_schema_max_cond_instances

  • Description: Specifies the maximum number of instrumented condition objects. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-cond-instances=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1 (>= MariaDB 10.0.12), 1000 (<= MariaDB 10.0.11)
  • Range: -1 to 1048576

performance_schema_max_digest_length

  • Description: Maximum length considered for digest text, when stored in performance_schema tables.
  • Commandline: --performance-schema-max-digest-length=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 1024
  • Range: 0 to 1048576
  • Introduced: MariaDB 10.0.21

performance_schema_max_file_classes

  • Description: Specifies the maximum number of file instruments.
  • Commandline: --performance-schema-max-file-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value:80 (>= MariaDB 10.5.2), 50 (<= MariaDB 10.5.1)
  • Range: 0 to 256

performance_schema_max_file_handles

  • Description: Specifies the maximum number of opened file objects. Should always be higher than open_files_limit.
  • Commandline: --performance-schema-max-file-handles=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 32768
  • Range: -1 to 32768

performance_schema_max_file_instances

  • Description: Specifies the maximum number of instrumented file objects. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-file-instances=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1 (>= MariaDB 10.0.12), 10000 (<= MariaDB 10.0.11)
  • Range: -1 to 1048576

performance_schema_max_mutex_classes

  • Description: Specifies the maximum number of mutex instruments.
  • Commandline: --performance-schema-max-mutex-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 200
  • Range: 0 to 256

performance_schema_max_mutex_instances

  • Description: Specifies the maximum number of instrumented mutex instances. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-mutex-instances=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value:-1 (>= MariaDB 10.0.12), 1000000 (<= MariaDB 10.0.11)
  • Range: -1 to 104857600

performance_schema_max_rwlock_classes

  • Description: Specifies the maximum number of rwlock instruments.
  • Commandline: --performance-schema-max-rwlock-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 40
  • Range: 0 to 256

performance_schema_max_rwlock_instances

  • Description: Specifies the maximum number of instrumented rwlock objects. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-rwlock-instances=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value:-1 (>= MariaDB 10.0.12), 1000000 (<= MariaDB 10.0.11)
  • Range: -1 to 104857600

performance_schema_max_socket_classes

  • Description: Specifies the maximum number of socket instruments.
  • Commandline: --performance-schema-max-socket-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 10
  • Range: 0 to 256
  • Introduced: MariaDB 10.0.0

performance_schema_max_socket_instances

  • Description: Specifies the maximum number of instrumented socket objects. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-socket-instances=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value:-1 (>= MariaDB 10.0.12)
  • Range: -1 to 1048576
  • Introduced: MariaDB 10.0.0

performance_schema_max_stage_classes

  • Description: Specifies the maximum number of stage instruments.
  • Commandline: --performance-schema-max-stage-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 160 (>= MariaDB 10.3.3), 150 (<= MariaDB 10.3.2)
  • Range: 0 to 256
  • Introduced: MariaDB 10.0.0

performance_schema_max_statement_classes

  • Description: Specifies the maximum number of statement instruments. Automatically calculated at server build based on the number of available statements. Should be left as either autosized or disabled, as changing to any positive value has no benefit and will most likely allocate unnecessary memory. Setting to zero disables all statement instrumentation, and no memory will be allocated for this purpose.
  • Commandline: --performance-schema-max-statement-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: Autosized (see description)
  • Range: 0 to 256
  • Introduced: MariaDB 10.0.0

performance_schema_max_table_handles

  • Description: Specifies the maximum number of opened table objects. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-table-handles=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1 (>= MariaDB 10.0.12), 10000 (<= MariaDB 10.0.11)
  • Range: -1 to 1048576

performance_schema_max_table_instances

  • Description: Specifies the maximum number of instrumented table objects. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-table-instances=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value:-1 (>= MariaDB 10.0.12), 1000 (<= MariaDB 10.0.11)
  • Range: -1 to 1048576

performance_schema_max_thread_classes

  • Description: Specifies the maximum number of thread instruments.
  • Commandline: --performance-schema-max-thread-classes=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 50
  • Range: 0 to 256

performance_schema_max_thread_instances

  • Description: Specifies how many of the running server threads (see max_connections and max_delayed_threads) can be instrumented. Should be greater than the sum of max_connections and max_delayed_threads. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-max-thread-instances=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value:-1 (>= MariaDB 10.0.12), 1000 (<= MariaDB 10.0.11)
  • Range: -1 to 1048576

performance_schema_session_connect_attrs_size

  • Description: Per thread preallocated memory for holding connection attribute strings. Incremented if the strings are larger than the reserved space. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
  • Commandline: --performance-schema-session-connect-attrs-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: -1 (>= MariaDB 10.0.12)
  • Range: -1 to 1048576
  • Introduced: MariaDB 10.0.4

performance_schema_setup_actors_size

  • Description: The maximum number of rows to store in the performance schema setup_actors table.
  • Commandline: --performance-schema-setup-actors-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 100
  • Range: 0 to 1024
  • Introduced: MariaDB 10.0.0

performance_schema_setup_objects_size

  • Description: The maximum number of rows that can be stored in the performance schema setup_objects table.
  • Commandline: --performance-schema-setup-objects-size=#
  • Scope: Global
  • Dynamic: No
  • Data Type: numeric
  • Default Value: 100
  • Range: 0 to 1048576
  • Introduced: MariaDB 10.0.0

performance_schema_users_size


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