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https://dev.mysql.com/doc/refman/5.7/en/optimizing-queries-myisam.html
For MyISAM tables that change frequently, try to avoid all variable-length columns (VARCHAR, BLOB, and TEXT). The table uses dynamic row format if it includes even a single variable-length column. The only cases where splitting up a table makes an ... Some general tips for speeding up queries on MyISAM tables: To help MySQL better optimize queries, use ANALYZE TABLE or run myisamchk --analyze on a table after it has been loaded with ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-invoked.html
For example, trying to replicate a loadable function with statement-based replication generates this warning because it currently cannot be determined by the MySQL server whether the function is deterministic. The ORIGINATOR column in the ...
https://dev.mysql.com/doc/refman/5.7/en/show-slave-hosts.html
Statement output includes this column only if the source server is started with the --show-slave-auth-info option. Statement output includes this column only if the source server is started with the --show-slave-auth-info option. A zero in this ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-materialization.html
Materialization speeds up query execution by generating a subquery result as a temporary table, normally in memory. Assume that where_condition involves columns only from t2 and not t1 so that the subquery is noncorrelated. The optimizer uses ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-optimization-with-exists.html
Table-condition generator: If the subquery is a join of several tables, the triggered condition is checked as soon as possible. In EXPLAIN output, the fallback shows up as Full scan on NULL key in the Extra column: mysql> EXPLAIN SELECT t1.col1, ...
https://dev.mysql.com/doc/refman/5.7/en/dynamic-format.html
Dynamic storage format is used if a MyISAM table contains any variable-length columns (VARCHAR, VARBINARY, BLOB, or TEXT), or if the table was created with the ROW_FORMAT=DYNAMIC table option. If you have fixed-length columns that you access or ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-system-tables.html
INNODB_SYS_COLUMNS provides metadata about InnoDB table columns, equivalent to the information in the SYS_COLUMNS table in the InnoDB data dictionary. INNODB_SYS_FIELDS provides metadata about the key columns (fields) of InnoDB indexes, equivalent ... You can extract metadata about schema objects managed by InnoDB using InnoDB INFORMATION_SCHEMA system ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-overview.html
The SQL language itself is intended to work independently of any data structures or media underlying the schemas, tables, rows, or columns with which it works. This expression can be a column value, a function acting on one or more column values, or ... This section provides a conceptual overview of partitioning in MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-auto-increment.html
Statement-based replication of AUTO_INCREMENT, LAST_INSERT_ID(), and TIMESTAMP values is done correctly, subject to the following exceptions: When using statement-based replication prior to MySQL 5.7.1, AUTO_INCREMENT columns in tables on the ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-reference.html
The table has these columns: USER The user name part of an account. The field value is an integer that represents the UNIX timestamp value indicating the date and time when the audit event was generated. Unless those objects are installed, the ...