Search Results
https://dev.mysql.com/doc/refman/8.4/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/8.4/en/partitioning-selection.html
Explicit selection of partitions and subpartitions for rows matching a given WHERE condition is supported. Partition selection is similar to partition pruning, in that only specific partitions are checked for matches, but differs in two key ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/en/performance-schema-optimization.html
Applications that monitor databases may make frequent use of Performance Schema tables. To write queries for these tables most efficiently, take advantage of their indexes. For example, include a WHERE clause that restricts retrieved rows based on ...
https://dev.mysql.com/doc/refman/8.4/en/performance-schema-quick-start.html
This section briefly introduces the Performance Schema with examples that show how to use it. For additional examples, see Section 29.19, “Using the Performance Schema to Diagnose Problems”. To enable or disable it explicitly, start the server ...
https://dev.mysql.com/doc/refman/8.4/en/set-character-set.html
SET {CHARACTER SET | CHARSET} {'charset_name' | DEFAULT} This statement maps all strings sent between the server and the current client with the given mapping. SET CHARACTER SET sets three session system variables: character_set_client and ...
https://dev.mysql.com/doc/refman/8.4/en/show-create-procedure.html
SHOW CREATE PROCEDURE proc_name This statement is a MySQL extension. It returns the exact string that can be used to re-create the named stored procedure. A similar statement, SHOW CREATE FUNCTION, displays information about stored functions (see ...
https://dev.mysql.com/doc/refman/8.4/en/show.html
SHOW has many forms that provide information about databases, tables, columns, or status information about the server. The pattern is useful for restricting statement output to matching values. Several SHOW statements also accept a WHERE clause ...
https://dev.mysql.com/doc/refman/8.4/en/string-type-syntax.html
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. In some cases, MySQL may change a string column to a type different from that given in a CREATE TABLE or ALTER TABLE statement. For definitions of character ...
https://dev.mysql.com/doc/c-api/8.4/en/c-api-data-structures.html
This section describes C API data structures other than those used for prepared statements, the asynchronous interface, or the replication stream interface. For information about those, see Section 6.2, “C API Prepared Statement Data ...