Mroonga System Variables

This page documents system variables related to the Mroonga storage engine. See Server System Variables for 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.

• Command line: --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 ()

mroonga_database_path_prefix

• Description: The database path prefix.

• Command line: --mroonga-database-path-prefix=value

• Scope: Global

• Dynamic: Yes

mroonga_default_parser

• Description: The fulltext default parser, for example TokenBigramSplitSymbolAlphaDigit or TokenBigram (the default). See the list of options at . Deprecated since Mroonga 5.04, use instead.

• Command line: --mroonga-default-parser=value

• Scope: Global

mroonga_default_tokenizer

• Description: The fulltext default parser, for example TokenBigramSplitSymbolAlphaDigit or TokenBigram (the default). See the list of options at .

• Command line: --mroonga-default-tokenizer=value

• Scope: Global, Session

mroonga_default_wrapper_engine

• Description: The default engine for wrapper mode.

• Command line: --mroonga-default-wrapper-engine=value

• Scope: Global

• Dynamic: No

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.

• Command line: --mroonga-dry-write[={0|1}]

• Scope: Global, Session

mroonga_enable_operations_recording

• Description: Whether recording operations for recovery to the Groonga database is enabled (default) or not. Requires reopening the database with after changing the variable.

• Command line: --mroonga-enable-operations-recording={0|1}

• Scope: Global

• Dynamic: Yes

mroonga_enable_optimization

• Description: If set to on (the default), optimization is enabled. Only really useful to change for benchmarking.

• Command line: --mroonga-enable-optimization={0|1}

• Scope: Global, Session

• Dynamic: Yes

mroonga_libgroonga_embedded

• Description: Whether libgroonga is embedded or not.

• Command line: None

• Scope: Global

• Dynamic: No

mroonga_libgroonga_support_lz4

• Description: Whether libgroonga supports lz4 or not.

• Command line: None

• Scope: Global

• Dynamic: No

mroonga_libgroonga_support_zlib

• Description: Whether libgroonga supports zlib or not.

• Command line: None

• Scope: Global

• Dynamic: No

mroonga_libgroonga_support_zstd

• Description: Whether libgroonga supports Zstandard or not.

• Command line: None

• Scope: Global

• Dynamic: No

mroonga_libgroonga_version

• Description: Groonga library version.

• Command line: None

• Scope: Global

• Dynamic: No

mroonga_lock_timeout

• Description: Lock timeout used in Groonga.

• Command line: --mroonga-lock-timeout=#

• Scope: Global

• Dynamic: Yes

mroonga_log_file

• Description: Name and path of the Mroonga log file.

• Command line: --mroonga-log-file=value

• Scope: Global

• Dynamic: Yes

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.

mroonga_match_escalation_threshold

• Description: The threshold to determine whether the match method is escalated. -1 means never escalate.

• Command line: --mroonga-match-escalation-threshold=#

• Scope: Global, Session

• Dynamic: Yes

mroonga_max_n_records_for_estimate

• Description: The max number of records to estimate the number of matched records

• Command line: --mroonga-max-n-records-for-estimate=#

• Scope: Global, Session

• Dynamic: Yes

mroonga_query_log_file

• Description: Query log file for Mroonga.

• Command line: --mroonga-query-log-file=filename

• Scope: Global

• Dynamic: Yes

mroonga_vector_column_delimiter

• Description: Delimiter to use when outputting a vector column. The default is a white space.

• Command line: --mroonga-vector-column-delimiter=value

• Scope: Global

• Dynamic: Yes

mroonga_version

• Description: Mroonga version

• Command line: None

• Scope: Global

• Dynamic: No

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