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https://dev.mysql.com/doc/refman/8.0/en/lock-instance-for-backup.html
LOCK INSTANCE FOR BACKUP permits DDL operations that only affect user-created temporary tables. In effect, files that belong to user-created temporary tables can be created, renamed, or removed while a backup lock is held. LOCK INSTANCE FOR BACKUP ... LOCK INSTANCE FOR BACKUP UNLOCK INSTANCE LOCK INSTANCE FOR BACKUP acquires an instance-level backup lock that permits DML during an online backup while preventing operations that could result in an inconsistent ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-logs-cluster-log.html
The following table lists the most common NDB cluster log messages. Table 25.53 Common NDB cluster log messages Log Message Description Event Name Event Type Priority Severity Node mgm_node_id: Node data_node_id Connected The data node having node ...For information about the cluster log, log events, and event types, see Section 25.6.3, “Event Reports Generated in NDB ...
https://dev.mysql.com/doc/refman/8.0/en/revoke.html
(GRANT does not create such rows when lower_case_table_names is set, but such rows might have been created prior to setting the variable. To revoke all privileges from a user, use one of the following statements; either of these statements drops all ...[IGNORE UNKNOWN USER] REVOKE [IF EXISTS] ALL [PRIVILEGES], GRANT OPTION FROM user_or_role [, user_or_role] ...
https://dev.mysql.com/doc/refman/8.0/en/function-optimization.html
If a function is tagged nondeterministic, a reference to it in a WHERE clause is evaluated for every row (when selecting from one table) or combination of rows (when selecting from a multiple-table join). MySQL also determines when to evaluate ...A ...
https://dev.mysql.com/doc/refman/8.0/en/identifier-length.html
The following table describes the maximum length for each type of identifier. For constraint definitions that include no constraint name, the server internally generates a name derived from the associated table name. For example, internally ...You ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-programs-ndb-size-pl.html
If you do not wish to use an existing account, then creating one using GRANT USAGE ON db_name.*—where db_name is the name of the database to be examined—is sufficient for this purpose. Options that can be used with ndb_size.pl are shown in the ... This is a Perl script that can be used to estimate the amount of space that would be required by a MySQL database if it were converted to use the NDBCLUSTER storage ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning.html
An attempt to create a partitioned tables using a storage engine that does not supply native partitioning support fails with ER_CHECK_NOT_IMPLEMENTED. Note Table partitioning differs from partitioning as used by window functions. MySQL 8.0 does not ...In MySQL 8.0, partitioning support is provided by the InnoDB and NDB storage ...
https://dev.mysql.com/doc/refman/8.0/en/replication-features-directory.html
If a DATA DIRECTORY or INDEX DIRECTORY table option is used in a CREATE TABLE statement on the source server, the table option is also used on the replica. This can be overridden by using the NO_DIR_IN_CREATE server SQL mode on the replica, which ...This can cause problems if no corresponding directory exists in the replica host file system or if it exists but is not accessible to the replica MySQL ...
https://dev.mysql.com/doc/refman/8.0/en/precision-math-examples.html
Consider these statements: mysql> CREATE TABLE t (i INT, d DECIMAL, f FLOAT); mysql> INSERT INTO t VALUES(1,1,1); mysql> CREATE TABLE y SELECT AVG(i), AVG(d), AVG(f) FROM t; The result is a double only for the floating-point argument. This section ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema.html
This section provides information and usage examples for InnoDB INFORMATION_SCHEMA tables. InnoDB INFORMATION_SCHEMA tables provide metadata, status information, and statistics about various aspects of the InnoDB storage engine. You can view a list ...