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https://dev.mysql.com/doc/refman/5.7/en/request-access.html
This is where the privilege columns in the grant tables come into play. These privileges can come from any of the user, db, tables_priv, columns_priv, or procs_priv tables. (You may find it helpful to refer to Section 6.2.3, “Grant Tables”, ...
https://dev.mysql.com/doc/refman/5.7/en/checksum-table.html
[QUICK | EXTENDED] CHECKSUM TABLE reports a checksum for the contents of a table. If you run CHECKSUM TABLE against a view, the Checksum value is always NULL, and a warning is returned. For a nonexistent table, CHECKSUM TABLE returns NULL and ...You ...
https://dev.mysql.com/doc/refman/5.7/en/myisam-table-close.html
Each MyISAM index file (.MYI file) has a counter in the header that can be used to check whether a table has been closed properly. If you get the following warning from CHECK TABLE or myisamchk, it means that this counter has gone out of sync: ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-transaction-tables.html
These tables store transaction events: events_transactions_current: The current transaction event for each thread. There are also summary tables that aggregate information about transaction events; see Section 25.12.15.4, “Transaction Summary ...
https://dev.mysql.com/doc/refman/5.7/en/column-count-limit.html
This section describes limits on the number of columns in tables and the size of individual rows. Column Count Limits Row Size Limits Column Count Limits MySQL has hard limit of 4096 columns per table, but the effective maximum may be less for a ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-overview.html
However, if no columns are listed in the PARTITION BY KEY or PARTITION BY LINEAR KEY clause of the CREATE TABLE or ALTER TABLE statement used to create or modify a user-partitioned NDB table, then the table is not required to have an explicit ...The ... This section provides a conceptual overview of partitioning in MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-index-stat.html
ndb_index_stat provides per-fragment statistical information about indexes on NDB tables. sampleCount can be compared with the cardinality of SHOW INDEX or INFORMATION_SCHEMA.STATISTICS, although the latter two provide a view of the table as a ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-system-variables.html
The alternative SHOW PROCESSLIST implementation is based on the Performance Schema processlist table. To ensure that the default and alternative implementations yield the same information, certain configuration requirements must be met; see Section ...Even when the Performance Schema is disabled, it continues to populate the global_variables, session_variables, global_status, and session_status ...
https://dev.mysql.com/doc/refman/5.7/en/migrating-from-year2.html
Several programs or statements convert YEAR(2) columns to 4-digit YEAR columns automatically: ALTER TABLE statements that result in a table rebuild. To convert 2-digit YEAR(2) columns to 4-digit YEAR manually, use ALTER TABLE or REPAIR TABLE. If you ... This section describes problems that can occur when using the 2-digit YEAR(2) data type and provides information about converting existing YEAR(2) columns to 4-digit year-valued columns, which can be declared as YEAR with an implicit display width of 4 characters, or equivalently as YEAR(4) with an explicit display ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-buffer-pool-tables.html
The InnoDB INFORMATION_SCHEMA buffer pool tables provide buffer pool status information and metadata about the pages within the InnoDB buffer pool. The InnoDB INFORMATION_SCHEMA buffer pool tables include those listed below: mysql> SHOW TABLES FROM ...INNODB_BUFFER_PAGE_LRU: Holds information about the pages in the InnoDB buffer pool, in particular how they are ordered in the LRU list that determines which pages to evict from the buffer pool when it becomes ...