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.
IGNORE_AND_LOG: Log the error without reporting it.
Commandline: --mroonga-action-on-fulltext-query-error=value
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
mroonga_database_path_prefix
Description: The database path prefix.
Commandline: --mroonga-database-path-prefix=value
Commandline: --mroonga-default-parser=value
Default Value: TokenBigram
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
Default Value: TokenBigram
mroonga_default_wrapper_engine
Description: The default engine for wrapper mode.
Commandline: --mroonga-default-wrapper-engine=value
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}]
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}
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}
mroonga_libgroonga_embedded
Description: Whether libgroonga is embedded or not.
mroonga_libgroonga_support_lz4
Description: Whether libgroonga supports lz4 or not.
mroonga_libgroonga_support_zlib
Description: Whether libgroonga supports zlib or not.
mroonga_libgroonga_support_zstd
Description: Whether libgroonga supports Zstandard or not.
mroonga_libgroonga_version
Description: Groonga library version.
Description: Lock timeout used in Groonga.
Commandline: --mroonga-lock-timeout=#
Description: Name and path of the Mroonga log file.
Commandline: --mroonga-log-file=value
Default Value: groonga.log
Description: Mroonga log file output level, which determines what is logged. Valid levels include:
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.
Commandline: --mroonga-log-level=value
mroonga_match_escalation_threshold
Description: The threshold to determine whether the match method is escalated. -1 means never escalate.
Commandline: --mroonga-match-escalation-threshold=#
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=#
Description: Query log file for Mroonga.
Commandline: --mroonga-query-log-file=filename
Default Value: (Empty string)
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
Default Value: `` (white space)
Description: Mroonga version
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