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https://dev.mysql.com/doc/refman/9.7/en/partitioning-limitations-storage-engines.html
OPTIMIZE PARTITION does not work correctly with partitioned tables that use InnoDB. In MySQL 9.7, partitioning support is not actually provided by the MySQL Server, but rather by a table storage engine's own or native partitioning handler. In MySQL ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-management-exchange.html
Table nt contains no foreign key references, and no other table has any foreign keys that refer to nt. There are no rows in nt that lie outside the boundaries of the partition definition for p. For InnoDB tables, both tables must use the same row ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-overview.html
Some queries can be greatly optimized in virtue of the fact that data satisfying a given WHERE clause can be stored only on one or more partitions, which automatically excludes any remaining partitions from the search. This section provides a ...
https://dev.mysql.com/doc/refman/9.7/en/partitioning-types.html
This section discusses the types of partitioning which are available in MySQL 9.7. This type of partitioning assigns rows to partitions based on column values falling within a given range. For information about an extension to this type, RANGE ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-examples.html
To begin, you should have a repeatable use case where performance is deemed “too slow” and needs optimization, and you should enable all instrumentation (no pre-filtering at all). The Performance Schema is a tool to help a DBA do performance ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-instrument-naming.html
An instrument name consists of a sequence of elements separated by '/' characters. Example names: wait/io/file/myisam/log wait/io/file/mysys/charset wait/lock/table/sql/handler wait/synch/cond/mysys/COND_alarm ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-query-profiling.html
The following example demonstrates how to use Performance Schema statement events and stage events to retrieve data comparable to profiling information provided by SHOW PROFILES and SHOW PROFILE statements. The setup_actors table can be used to ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-rwlock-instances-table.html
Shared-exclusive access is otherwise known as an sxlock and optimizes concurrency and improves scalability for read-write workloads. The rwlock_instances table lists all the rwlock (read write lock) instances seen by the Performance Schema while ...
https://dev.mysql.com/doc/refman/9.7/en/problems-with-float.html
Floating-point numbers sometimes cause confusion because they are approximate and not stored as exact values. A floating-point value as written in an SQL statement may not be the same as the value represented internally. Attempts to treat ...
https://dev.mysql.com/doc/refman/9.7/en/repair-table.html
[QUICK] [EXTENDED] [USE_FRM] REPAIR TABLE repairs a possibly corrupted table, for certain storage engines only. Although normally you should never have to run REPAIR TABLE, if disaster strikes, this statement is very likely to get back all your data ...