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https://dev.mysql.com/doc/refman/5.7/en/replace.html
When modifying an existing table that is not partitioned to accommodate partitioning, or, when modifying the partitioning of an already partitioned table, you may consider altering the table's primary key (see Section 22.6.1, “Partitioning Keys, ...REPLACE works exactly like INSERT, except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE index, the old row is deleted before the new row is ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-column-privileges-table.html
The COLUMN_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the table containing the column belongs. TABLE_SCHEMA ...The value can be any privilege that can be granted at the column level; see Section 13.7.1.4, “GRANT ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-buffer-pool-stats-table.html
The INNODB_BUFFER_POOL_STATS table provides much of the same buffer pool information provided in SHOW ENGINE INNODB STATUS output. For related usage information and examples, see Section 14.16.5, “InnoDB INFORMATION_SCHEMA Buffer Pool Tables”.
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/performance-schema-file-summary-tables.html
The Performance Schema maintains file I/O summary tables that aggregate information about I/O operations. Each file I/O summary table has one or more grouping columns to indicate how the table aggregates events. Event names refer to names of event ...Example file I/O event summary information: mysql> SELECT * FROM performance_schema.file_summary_by_event_name\G ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-performance-timers-table.html
Note As of MySQL 5.7.21, the Performance Schema setup_timers table is deprecated and is removed in MySQL 8.0, as is the TICKS row in the performance_timers table. The performance_timers table has these columns: TIMER_NAME The name by which to refer ...The rows that do not contain NULL indicate which timers you can use in ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-replication-applier-status-by-coordinator-table.html
For a multithreaded replica, the replica uses multiple worker threads and a coordinator thread to manage them, and this table shows the status of the coordinator thread. For a multithreaded replica, the replication_applier_status_by_worker table ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-repair-table.html
When used on a corrupted or otherwise damaged table, it is possible for the REPAIR TABLE statement to delete rows that cannot be recovered. However, any such modifications of table data performed by this statement are not replicated, which can ...
https://dev.mysql.com/doc/refman/5.7/en/table-corruption.html
If you have started mysqld with the myisam_recover_options system variable set, MySQL automatically checks and tries to repair MyISAM tables if they are marked as 'not closed properly' or 'crashed'. If this happens, MySQL writes an entry in the ...
https://dev.mysql.com/doc/refman/5.7/en/charset-conversion.html
To convert a binary or nonbinary string column to use a particular character set, use ALTER TABLE. The following statement accomplishes this: ALTER TABLE t MODIFY col1 CHAR(50) CHARACTER SET utf8; Conversion may be lossy if the column contains ...