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)
• Introduced: MariaDB 5.5

performance_schema_accounts_size

• Description: Number of rows in the performance_schema.accounts table. If set to 0, the Performance Schema will not store statistics in the accounts table. -1 (the default from MariaDB 10.0.12) for automated sizing.
• Commandline: --performance-schema-accounts-size=#
• Scope: Global
• Dynamic: No
• Data Type: numeric
• Default Value: -1 (>= MariaDB 10.0.12), 10 (<= MariaDB 10.0.11)
• Range: -1 to 1048576
• Introduced: MariaDB 10.0.0

performance_schema_digests_size

• Description: Maximum number of rows that can be stored in the events_statements_summary_by_digest table. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
• Commandline: --performance-schema-digests-size=#
• Scope: Global
• Dynamic: No
• Data Type: numeric
• Default Value: -1 (>= MariaDB 10.0.12), 1000 (<= MariaDB 10.0.11)
• Range: -1 to 200
• Introduced: MariaDB 10.0.0

performance_schema_events_stages_history_long_size

• Description: Number of rows in the events_stages_history_long table. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
• Commandline: --performance-schema-events-stages-history-long-size=#
• Scope: Global
• Dynamic: No
• Data Type: numeric
• Default Value: -1 (>= MariaDB 10.0.12), 10000 (<= MariaDB 10.0.11)
• Range: -1 to 1048576
• Introduced: MariaDB 10.0.0

performance_schema_events_stages_history_size

• Description: Number of rows per thread in the events_stages_history table. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
• Commandline: --performance-schema-events-stages-history-size=#
• Scope: Global
• Dynamic: No
• Data Type: numeric
• Default Value: -1 (>= MariaDB 10.0.12), 10 (<= MariaDB 10.0.11)
• Range: -1 to 1024
• Introduced: MariaDB 10.0.0

performance_schema_events_statements_history_long_size

• Description: Number of rows in the events_statements_history_long table. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
• Commandline: --performance-schema-events-statements-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
• Introduced: MariaDB 10.0.0

performance_schema_events_statements_history_size

• Description: Number of rows per thread in the events_statements_history table. 0 for disabling, -1 (the default from MariaDB 10.0.12) for automated sizing.
• Commandline: --performance-schema-events-statements-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
• Introduced: MariaDB 10.0.0

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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: 80
• Range: 0 to 256
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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: 50
• Range: 0 to 256
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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
• Introduced: MariaDB 5.5

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

• Description: Number of rows in the performance_schema.users table. If set to 0, the Performance Schema will not store connection statistics in the users table. -1 (the default from MariaDB 10.0.12) for automated sizing.
• Commandline: --performance-schema-users-size=#
• Scope: Global
• Dynamic: No
• Data Type: numeric
• Default Value: -1 (>= MariaDB 10.0.12)
• Range: -1 to 1048576
• Introduced: MariaDB 10.0.0