Mroonga System Variables

This page documents system variables related to the Mroonga storage engine. 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.

mroonga_action_on_fulltext_query_error

  • Description: Action to take when encountering a Mroonga fulltext error.
    • ERROR: Report an error without logging.
    • ERROR_AND_LOG: Report an error with logging (the default)
    • IGNORE: No logging or reporting - the error is ignored.
    • IGNORE_AND_LOG: Log the error without reporting it.
  • Commandline: --mroonga-action-on-fulltext-query-error=value
  • Scope: Global, Session
  • Dynamic: Yes
  • Data Type: enum
  • Default Value: ERROR_AND_LOG

mroonga_boolean_mode_syntax_flags

  • Description: Flags to customize syntax in BOOLEAN MODE searches. Available flags:
    • DEFAULT: (=SYNTAX_QUERY,ALLOW_LEADING_NOT)
    • ALLOW_COLUMN: Allows COLUMN:... syntax in query syntax, an incompatible change to the regular BOOLEAN MODE syntax. Permits multiple indexes in one MATCH () AGAINST (). Can be used in other operations besides full-text search, such as equal, and prefix search. See Groonga query syntax for more details.
    • ALLOW_LEADING_NOT Permits using the NOT_INCLUDED_KEYWORD syntax in the query syntax.
    • ALLOW_UPDATE: Permits updating values with the COLUMN:=NEW_VALUE syntax in the query syntax.
    • SYNTAX_QUERY: Mroonga will use Groonga's query syntax, compatible with MariaDB's BOOLEAN MODE syntax. Unless SYNTAX_SCRIPT is specified, this mode is always in use.
    • SYNTAX_SCRIPT: Mroonga will use Groonga's script syntax, a JavaScript-like syntax. If both SYNTAX_QUERY and SYNTAX_SCRIPT are specified, SYNTAX_SCRIPT will take precedence..
  • Commandline: --mroonga-boolean-mode-syntax-flags=value
  • Scope: Global, Session
  • Dynamic: Yes
  • Data Type: enum
  • Default Value: DEFAULT

mroonga_database_path_prefix

  • Description: The database path prefix.
  • Commandline: --mroonga-database-path-prefix=value
  • Scope: Global
  • Dynamic: Yes
  • Data Type: string
  • Default Value: (Empty)

mroonga_default_parser

  • Description: The fulltext default parser, for example TokenBigramSplitSymbolAlphaDigit or TokenBigram (the default). See the list of options at Mroonga Overview:Parser. Deprecated since Mroonga 5.04, use mroonga_default_tokenizer instead.
  • Commandline: --mroonga-default-parser=value
  • Scope: Global
  • Dynamic: Yes
  • Data Type: string
  • Default Value: TokenBigram
  • Deprecated: MariaDB 10.1.6, Mroonga 5.0.4

mroonga_default_tokenizer

  • Description: The fulltext default parser, for example TokenBigramSplitSymbolAlphaDigit or TokenBigram (the default). See the list of options at Mroonga Overview:Parser.
  • Commandline: --mroonga-default-tokenizer=value
  • Scope: Global, Session
  • Dynamic: Yes
  • Data Type: string
  • Default Value: TokenBigram
  • Introduced: MariaDB 10.1.6, Mroonga 5.0.4

mroonga_default_wrapper_engine

  • Description: The default engine for wrapper mode.
  • Commandline: --mroonga-default-wrapper-engine=value
  • Scope: Global
  • Dynamic: No
  • Data Type: string
  • Default Value: (Empty)

mroonga_dry_write

  • Description: If set to on, (off is default), data is not actually written to the Groonga database. Only really useful to change for benchmarking.
  • Commandline: --mroonga-dry-write[={0|1}]
  • Scope: Global, Session
  • Dynamic: Yes
  • Data Type: boolean
  • Default Value: off

mroonga_enable_operations_recording

  • Description: Whether recording operations for recovery to the Groonga database is enabled (default) or not. Requires reopening the database with FLUSH TABLES after changing the variable.
  • Commandline: --mroonga-enable-operations-recording={0|1}
  • Scope: Global
  • Dynamic: Yes
  • Data Type: boolean
  • Default Value: ON
  • Introduced: MariaDB 10.2.11, MariaDB 10.1.29

mroonga_enable_optimization

  • Description: If set to on (the default), optimization is enabled. Only really useful to change for benchmarking.
  • Commandline: --mroonga-enable-optimization={0|1}
  • Scope: Global, Session
  • Dynamic: Yes
  • Data Type: boolean
  • Default Value: on

mroonga_libgroonga_embedded

  • Description: Whether libgroonga is embedded or not.
  • Commandline: None
  • Scope: Global
  • Dynamic: No
  • Data Type: boolean
  • Default Value: ON
  • Introduced: MariaDB 10.1.6

mroonga_libgroonga_support_lz4

  • Description: Whether libgroonga supports lz4 or not.
  • Commandline: None
  • Scope: Global
  • Dynamic: No
  • Data Type: boolean
  • Default Value: OFF
  • Introduced: MariaDB 10.0.17

mroonga_libgroonga_support_zlib

  • Description: Whether libgroonga supports zlib or not.
  • Commandline: None
  • Scope: Global
  • Dynamic: No
  • Data Type: boolean
  • Default Value: ON

mroonga_libgroonga_support_zstd

  • Description: Whether libgroonga supports Zstandard or not.
  • Commandline: None
  • Scope: Global
  • Dynamic: No
  • Data Type: boolean
  • Default Value: OFF
  • Introduced: MariaDB 10.2.11, MariaDB 10.1.29

mroonga_libgroonga_version

  • Description: Groonga library version.
  • Commandline: None
  • Scope: Global
  • Dynamic: No
  • Data Type: string

mroonga_lock_timeout

  • Description: Lock timeout used in Groonga.
  • Commandline: <<code>>--mroonga-lock-timeout=#</code>>
  • Scope: Global
  • Dynamic: Yes
  • Data Type: numeric
  • Default Value: 900000
  • Range: -1 to 2147483647

mroonga_log_file

  • Description: Name and path of the Mroonga log file.
  • Commandline: --mroonga-log-file=value
  • Scope: Global
  • Dynamic: Yes
  • Data Type: string
  • Default Value: groonga.log

mroonga_log_level

  • Description: Mroonga log file output level, which determines what is logged. Valid levels include:
    • NONE No output.
    • EMERG: Only emergency error messages, such as database corruption.
    • ALERT: Alert messages, such as internal errors.
    • CRIT : Critical error messages, such as deadlocks.
    • ERROR : Errors, such as API errors.
    • WARNING: Warnings, such as invalid arguments.
    • NOTICE: Notices, such as a change in configuration or a status change.
    • INFO: Information messages, such as file system operations.
    • DEBUG: Debug messages, suggested for developers or testers.
    • DUMP: Dump messages.
  • Commandline: --mroonga-log-level=value
  • Scope: Global
  • Dynamic: Yes
  • Data Type: enum
  • Default Value: NOTICE

mroonga_match_escalation_threshold

  • Description: The threshold to determine whether the match method is escalated. -1 means never escalate.
  • Commandline: --mroonga-match-escalation-threshold=#
  • Scope: Global, Session
  • Dynamic: Yes
  • Data Type: numeric
  • Default Value: 0
  • Range: -1 to 9223372036854775807

mroonga_max_n_records_for_estimate

  • Description: The max number of records to estimate the number of matched records
  • Commandline: --mroonga-max-n-records-for-estimate=#
  • Scope: Global, Session
  • Dynamic: Yes
  • Data Type: numeric
  • Default Value: 1000
  • Range: -1 to 2147483647
  • Introduced: MariaDB 10.0.18, Mroonga 5.0.2

mroonga_query_log_file

  • Description: Query log file for Mroonga.
  • Commandline: --mroonga-query-log-file=filename
  • Scope: Global
  • Dynamic: Yes
  • Data Type: string
  • Default Value: (Empty string)
  • Introduced: MariaDB 10.2.11, MariaDB 10.1.29

mroonga_vector_column_delimiter

  • Description: Delimiter to use when outputting a vector column. The default is a white space.
  • Commandline: --mroonga-vector-column-delimiter=value
  • Scope: Global
  • Dynamic: Yes
  • Data Type: string
  • Default Value: (white space)

mroonga_version

  • Description: Mroonga version
  • Commandline: None
  • Scope: Global
  • Dynamic: No
  • Data Type: string

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