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[Tools] Database: `information_schema` Table: `SYSTEM_VARIABLES`

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Table `information_schema`.`SYSTEM_VARIABLES`
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	#	VARIABLE_NAME	SESSION_VALUE	GLOBAL_VALUE	GLOBAL_VALUE_ORIGIN	DEFAULT_VALUE	VARIABLE_SCOPE	VARIABLE_TYPE	VARIABLE_COMMENT	NUMERIC_MIN_VALUE	NUMERIC_MAX_VALUE	NUMERIC_BLOCK_SIZE	ENUM_VALUE_LIST [BB]	READ_ONLY	COMMAND_LINE_ARGUMENT	GLOBAL_VALUE_PATH
View: compact The Query contains 15 Columns
	1.	INNODB_LOG_CHECKSUMS	NULL	ON	COMPILE-TIME	ON	GLOBAL	BOOLEAN	Deprecated parameter with no effect.	NULL	NULL	NULL	OFF,ON	NO	REQUIRED	NULL
	2.	PERFORMANCE_SCHEMA	NULL	OFF	COMPILE-TIME	OFF	GLOBAL	BOOLEAN	Enable the performance schema.	NULL	NULL	NULL	OFF,ON	YES	OPTIONAL	NULL
	3.	SQL_MODE	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	CONFIG	STRICT_TRANS_TABLES,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION	SESSION	SET	Sets the sql mode	NULL	NULL	NULL	REAL_AS_FLOAT,PIPES_AS_CONCAT,ANSI_QUOTES,IGNORE_SPACE,IGNORE_BAD_TABLE_OPTIONS,ONLY_FULL_GROUP_BY,NO_UNSIGNED_SUBTRACTION,NO_DIR_IN_CREATE,POSTGRESQL,ORACLE,MSSQL,DB2,MAXDB,NO_KEY_OPTIONS,NO_TABLE_OPTIONS,NO_FIELD_OPTIONS,MYSQL323,MYSQL40,ANSI,NO_AUTO_VALUE_ON_ZERO,NO_BACKSLASH_ESCAPES,STRICT_TRANS_TABLES,STRICT_ALL_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ALLOW_INVALID_DATES,ERROR_FOR_DIVISION_BY_ZERO,TRADITIONAL,NO_AUTO_CREATE_USER,HIGH_NOT_PRECEDENCE,NO_ENGINE_SUBSTITUTION,PAD_CHAR_TO_FULL_LENGTH,EMPTY_STRING_IS_NULL,SIMULTANEOUS_ASSIGNMENT,TIME_ROUND_FRACTIONAL	NO	REQUIRED	NULL
	4.	SYSTEM_VERSIONING_ALTER_HISTORY	ERROR	ERROR	COMPILE-TIME	ERROR	SESSION	ENUM	Versioning ALTER TABLE mode. ERROR: Fail ALTER with error; KEEP: Keep historical system rows and subject them to ALTER	NULL	NULL	NULL	ERROR,KEEP	NO	REQUIRED	NULL
	5.	UNIQUE_CHECKS	ON	ON	COMPILE-TIME	ON	SESSION	BOOLEAN	If set to 1, the default, secondary indexes in InnoDB tables are performed. If set to 0, storage engines can (but are not required to) assume that duplicate keys are not present in input data. Set to 0 to speed up imports of large tables to InnoDB. The storage engine will still issue a duplicate key error if it detects one, even if set to 0.	NULL	NULL	NULL	OFF,ON	NO	NULL	NULL
	6.	PERFORMANCE_SCHEMA_EVENTS_WAITS_HISTORY_SIZE	NULL	-1	COMPILE-TIME	-1	GLOBAL	BIGINT	Number of rows per thread in EVENTS_WAITS_HISTORY. Use 0 to disable, -1 for automated sizing.	-1	1024	1	NULL	YES	REQUIRED	NULL
	7.	MAX_RELAY_LOG_SIZE	1073741824	1073741824	AUTO	1073741824	SESSION	BIGINT UNSIGNED	relay log will be rotated automatically when the size exceeds this value. If 0 at startup, it's set to max_binlog_size	4096	1073741824	4096	NULL	NO	REQUIRED	NULL
	8.	PERFORMANCE_SCHEMA_MAX_COND_CLASSES	NULL	90	COMPILE-TIME	90	GLOBAL	BIGINT UNSIGNED	Maximum number of condition instruments.	0	256	1	NULL	YES	REQUIRED	NULL
	9.	HAVE_RTREE_KEYS	NULL	YES	COMPILE-TIME	NULL	GLOBAL	VARCHAR	If RTREE indexes (used for spatial indexes) are available, will be set to YES, otherwise will be set to NO.	NULL	NULL	NULL	NULL	YES	NULL	NULL
	10.	PERFORMANCE_SCHEMA_MAX_COND_INSTANCES	NULL	-1	COMPILE-TIME	-1	GLOBAL	BIGINT	Maximum number of instrumented condition objects. Use 0 to disable, -1 for automated sizing.	-1	1048576	1	NULL	YES	REQUIRED	NULL
	11.	INNODB_FLUSH_LOG_AT_TIMEOUT	NULL	1	COMPILE-TIME	1	GLOBAL	INT UNSIGNED	Write and flush logs every (n) second.	0	2700	0	NULL	NO	OPTIONAL	NULL
	12.	PERFORMANCE_SCHEMA_MAX_RWLOCK_INSTANCES	NULL	-1	COMPILE-TIME	-1	GLOBAL	BIGINT	Maximum number of instrumented RWLOCK objects. Use 0 to disable, -1 for automated sizing.	-1	104857600	1	NULL	YES	REQUIRED	NULL
	13.	INNODB_ENCRYPT_TEMPORARY_TABLES	NULL	OFF	COMPILE-TIME	OFF	GLOBAL	BOOLEAN	Enrypt the temporary table data.	NULL	NULL	NULL	OFF,ON	YES	OPTIONAL	NULL
	14.	PERFORMANCE_SCHEMA_MAX_PREPARED_STATEMENTS_INSTANCES	NULL	-1	COMPILE-TIME	-1	GLOBAL	BIGINT	Maximum number of instrumented prepared statements. Use 0 to disable, -1 for automated scaling.	-1	1048576	1	NULL	YES	REQUIRED	NULL
	15.	PERFORMANCE_SCHEMA_MAX_THREAD_CLASSES	NULL	50	COMPILE-TIME	50	GLOBAL	BIGINT UNSIGNED	Maximum number of thread instruments.	0	256	1	NULL	YES	REQUIRED	NULL
	16.	RPL_SEMI_SYNC_SLAVE_TRACE_LEVEL	NULL	32	COMPILE-TIME	32	GLOBAL	BIGINT UNSIGNED	The tracing level for semi-sync replication.	0	18446744073709551615	1	NULL	NO	REQUIRED	NULL
	17.	SSL_CAPATH	NULL		COMPILE-TIME		GLOBAL	VARCHAR	CA directory (check OpenSSL docs, implies --ssl)	NULL	NULL	NULL	NULL	YES	REQUIRED	NULL
	18.	PERFORMANCE_SCHEMA_MAX_MUTEX_INSTANCES	NULL	-1	COMPILE-TIME	-1	GLOBAL	BIGINT	Maximum number of instrumented MUTEX objects. Use 0 to disable, -1 for automated sizing.	-1	104857600	1	NULL	YES	REQUIRED	NULL
	19.	CORE_FILE	NULL	OFF	COMPILE-TIME	NULL	GLOBAL	BOOLEAN	write a core-file on crashes	NULL	NULL	NULL	OFF,ON	YES	NULL	NULL
	20.	EVENT_SCHEDULER	NULL	OFF	COMPILE-TIME	OFF	GLOBAL	ENUM	Enable the event scheduler. Possible values are ON, OFF, and DISABLED (keep the event scheduler completely deactivated, it cannot be activated run-time)	NULL	NULL	NULL	OFF,ON,DISABLED,ORIGINAL	NO	OPTIONAL	NULL
	21.	INNODB_STATS_TRANSIENT_SAMPLE_PAGES	NULL	8	COMPILE-TIME	8	GLOBAL	BIGINT UNSIGNED	The number of leaf index pages to sample when calculating transient statistics (if persistent statistics are not used, default 8)	1	18446744073709551615	0	NULL	NO	REQUIRED	NULL
	22.	GTID_IGNORE_DUPLICATES	NULL	OFF	COMPILE-TIME	OFF	GLOBAL	BOOLEAN	When set, different master connections in multi-source replication are allowed to receive and process event groups with the same GTID (when using GTID mode). Only one will be applied, any others will be ignored. Within a given replication domain, just the sequence number will be used to decide whether a given GTID has been already applied; this means it is the responsibility of the user to ensure that GTID sequence numbers are strictly increasing.	NULL	NULL	NULL	OFF,ON	NO	OPTIONAL	NULL
	23.	SLOW_LAUNCH_TIME	NULL	2	COMPILE-TIME	2	GLOBAL	BIGINT UNSIGNED	If creating the thread takes longer than this value (in seconds), the Slow_launch_threads counter will be incremented	0	31536000	1	NULL	NO	REQUIRED	NULL
	24.	PERFORMANCE_SCHEMA_MAX_RWLOCK_CLASSES	NULL	50	COMPILE-TIME	50	GLOBAL	BIGINT UNSIGNED	Maximum number of rwlock instruments.	0	256	1	NULL	YES	REQUIRED	NULL
	25.	OPTIMIZER_SELECTIVITY_SAMPLING_LIMIT	100	100	COMPILE-TIME	100	SESSION	BIGINT UNSIGNED	Controls number of record samples to check condition selectivity	10	4294967295	1	NULL	NO	REQUIRED	NULL
	26.	RPL_SEMI_SYNC_SLAVE_KILL_CONN_TIMEOUT	NULL	5	COMPILE-TIME	5	GLOBAL	INT UNSIGNED	Timeout for the mysql connection used to kill the slave io_thread's connection on master. This timeout comes into play when stop slave is executed.	0	4294967295	1	NULL	NO	OPTIONAL	NULL
	27.	INNODB_ADAPTIVE_HASH_INDEX_PARTS	NULL	8	COMPILE-TIME	8	GLOBAL	BIGINT UNSIGNED	Number of InnoDB Adaptive Hash Index Partitions (default 8)	1	512	0	NULL	YES	OPTIONAL	NULL
	28.	PERFORMANCE_SCHEMA_ACCOUNTS_SIZE	NULL	-1	COMPILE-TIME	-1	GLOBAL	BIGINT	Maximum number of instrumented user@host accounts. Use 0 to disable, -1 for automated sizing.	-1	1048576	1	NULL	YES	REQUIRED	NULL
	29.	THREAD_POOL_OVERSUBSCRIBE	NULL	3	COMPILE-TIME	3	GLOBAL	INT UNSIGNED	How many additional active worker threads in a group are allowed.	1	1000	1	NULL	NO	REQUIRED	NULL
	30.	PERFORMANCE_SCHEMA_SETUP_OBJECTS_SIZE	NULL	-1	COMPILE-TIME	-1	GLOBAL	BIGINT	Maximum number of rows in SETUP_OBJECTS.	-1	1048576	1	NULL	YES	REQUIRED	NULL

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