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https://dev.mysql.com/doc/refman/8.0/en/partitioning-management-hash-key.html
Tables which are partitioned by hash or by key are very similar to one another with regard to making changes in a partitioning setup, and both differ in a number of ways from tables which have been partitioned by range or list. For that reason, ...
https://dev.mysql.com/doc/refman/8.0/en/password-logging.html
Passwords can be written as plain text in SQL statements such as CREATE USER, GRANT and SET PASSWORD. Statement logging avoids writing passwords as cleartext for the following statements: CREATE USER ... If such statements are logged by the MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-locks-table.html
THREAD_ID The thread ID of the session that created the lock. THREAD_ID can be used together with EVENT_ID to determine the event during which the lock data structure was created in memory. In practice, InnoDB always creates an index ...For ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-summary-tables.html
If no row has the digest value for the statement that just completed, and the table is not full, a new row is created for the statement. If no row has the statement digest value for the statement that just completed, and the table is full, the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-threads-table.html
Thereafter, a new row is added each time the server creates a thread. If the thread spawns a subthread, matching occurs again for the threads table row created for the subthread. If the thread spawns a subthread, matching occurs again for the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-transaction-tables.html
CREATE TABLE t2 (a INT) ENGINE = MyISAM; -- Transaction 1 COMMIT -- (implicit; DDL forces commit) 6. COMMIT; -- Transaction 2 COMMIT From the perspective of the server, Transaction 1 ends when table t2 is created. Within the event hierarchy, wait ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-wait-summary-tables.html
If an instrument is used to create multiple instances, each instance has a unique OBJECT_INSTANCE_BEGIN value and is summarized separately in this table. An instrument might be used to create multiple instances of the instrumented object. For ...
https://dev.mysql.com/doc/refman/8.0/en/prepare.html
The scope of a prepared statement is the session within which it is created, which as several implications: A prepared statement created in one session is not available to other sessions. A prepared statement created within a stored program ...
https://dev.mysql.com/doc/refman/8.0/en/problems-with-float.html
Suppose that you execute the following statements: CREATE TABLE t1(c1 FLOAT(53,0), c2 FLOAT(53,0)); INSERT INTO t1 VALUES('1e+52','-1e+52'); SELECT * FROM t1; On some platforms, the SELECT statement returns inf and -inf. An implication of the ...
https://dev.mysql.com/doc/refman/8.0/en/rebuilding-tables.html
If you need to rebuild an InnoDB table because a CHECK TABLE operation indicates that a table upgrade is required, use mysqldump to create a dump file and mysql to reload the file. For example, if t1 is an InnoDB table, use this statement: ALTER ...