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https://dev.mysql.com/doc/refman/5.7/en/replication-semisync-installation.html
Semisynchronous replication is implemented using plugins, so the plugins must be installed into the server to make them available. After a plugin has been installed, you control it by means of the system variables associated with it. These system ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-fulltext_index-tables.html
When OPTIMIZE TABLE is run, the INNODB_FT_BEING_DELETED table is emptied, and DOC_ID values are removed from the INNODB_FT_DELETED table. INNODB_FT_BEING_DELETED: Provides a snapshot of the INNODB_FT_DELETED table; it is used only during an OPTIMIZE ...
https://dev.mysql.com/doc/refman/5.7/en/myisamchk-table-info.html
Nullpos, Nullbit For columns that can be NULL, MyISAM stores NULL values as a flag in a byte. Depending on how many nullable columns there are, there can be one or more bytes used for this purpose. The Nullpos and Nullbit values, if nonempty, ... To ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-ndb-transid-mysql-connection-map-table.html
The ndb_transid_mysql_connection_map table provides a mapping between NDB transactions, NDB transaction coordinators, and MySQL Servers attached to an NDB Cluster as API nodes. This information is used when populating the server_operations and ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-examples.html
Identifying Blocking Transactions It is sometimes helpful to identify which transaction blocks another. The tables that contain information about InnoDB transactions and data locks enable you to determine which transaction is waiting for another, ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-routines-table.html
If the routine is a stored procedure, this value is NULL. If the routine is a stored procedure, this value is NULL. If the routine is a stored procedure, this value is NULL. If the routine is a stored procedure, this value is NULL. If the routine is ... The ROUTINES table provides information about stored routines (stored procedures and stored ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-management-range-list.html
Adding and dropping of range and list partitions are handled in a similar fashion, so we discuss the management of both sorts of partitioning in this section. For information about working with tables that are partitioned by hash or key, see ...
https://dev.mysql.com/doc/refman/5.7/en/libmysqld-example.html
* * You can use mysql_library_init(0, NULL, NULL), and it * initializes the server using groups = { * "server", "embedded", NULL * }. These two example programs should work without any changes on a Linux or FreeBSD system. For other operating ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-threads-table.html
row *************************** THREAD_ID: 1 NAME: thread/sql/main TYPE: BACKGROUND PROCESSLIST_ID: NULL PROCESSLIST_USER: NULL PROCESSLIST_HOST: NULL PROCESSLIST_DB: NULL PROCESSLIST_COMMAND: NULL PROCESSLIST_TIME: 80284 PROCESSLIST_STATE: NULL ...
https://dev.mysql.com/doc/refman/5.7/en/show-slave-status.html
In MySQL 5.7, this field is NULL (undefined or unknown) if the replica SQL thread is not running, or if the SQL thread has consumed all of the relay log and the replica I/O thread is not running. (In older versions of MySQL, this field was NULL if ... SHOW SLAVE STATUS [FOR CHANNEL channel] This statement provides status information on essential parameters of the replica ...