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https://dev.mysql.com/doc/refman/5.7/en/ignoring-user.html
If you get the following error, it means that when mysqld was started or when it reloaded the grant tables, it found an account in the user table that had an invalid password. Found wrong password for user 'some_user'@'some_host'; ignoring user As ...
https://dev.mysql.com/doc/refman/5.7/en/index-preloading.html
If there are enough blocks in a key cache to hold blocks of an entire index, or at least the blocks corresponding to its nonleaf nodes, it makes sense to preload the key cache with index blocks before starting to use it. Preloading enables you to ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-columns-table.html
The COLUMNS table has these columns: TABLE_CATALOG The name of the catalog to which the table containing the column belongs. TABLE_SCHEMA The name of the schema (database) to which the table containing the column belongs. ORDINAL_POSITION is ...
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. Much of the same information may also be obtained using InnoDB buffer pool server status variables. The idea of ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmp-per-index-table.html
The INNODB_CMP_PER_INDEX and INNODB_CMP_PER_INDEX_RESET tables provide status information on operations related to compressed InnoDB tables and indexes, with separate statistics for each combination of database, table, and index, to help you ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-sys-indexes-table.html
The INNODB_SYS_INDEXES table provides metadata about InnoDB indexes, equivalent to the information in the internal SYS_INDEXES table in the InnoDB data dictionary. For related usage information and examples, see Section 14.16.3, “InnoDB ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-partitions-table.html
Each row in this table corresponds to an individual partition or subpartition of a partitioned table. The PARTITIONS table has these columns: TABLE_CATALOG The name of the catalog to which the table belongs. TABLE_SCHEMA The name of the schema ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-profiling-table.html
Its contents correspond to the information produced by the SHOW PROFILE and SHOW PROFILES statements (see Section 13.7.5.30, “SHOW PROFILE Statement”). The table is empty unless the profiling session variable is set to 1. Note This table is ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-compression-tuning-monitoring.html
Overall application performance, CPU and I/O utilization and the size of disk files are good indicators of how effective compression is for your application. This section builds on the performance tuning advice from Section 14.9.1.3, “Tuning ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-create-table-external.html
There are different reasons for creating InnoDB tables externally; that is, creating tables outside of the data directory. Those reasons might include space management, I/O optimization, or placing tables on a storage device with particular ...