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https://dev.mysql.com/doc/refman/8.0/en/password-management.html
Password failure tracking, to enable temporary account locking after too many consecutive incorrect-password login failures. Internal Versus External Credentials Storage Password Expiration Policy Password Reuse Policy Password Verification-Required ... MySQL supports these password-management capabilities: Password expiration, to require passwords to be changed ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-metrics-table.html
The INNODB_METRICS table provides information about InnoDB performance and resource-related counters. SET GLOBAL innodb_monitor_disable = [counter-name|module_name|pattern|all]; innodb_monitor_reset: Resets counter values to zero. SET GLOBAL ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbd-definition.html
MaxNoOfConcurrentOperations sets the number of records that can be in update phase or locked simultaneously. These records contain state information needed to find UNDO records for rollback, lock queues, and other purposes. Read queries which set ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-transactions.html
To ensure that a given transaction reads only before or after values, you can impose row locks using SELECT ... In such cases, the lock is held until the owning transaction is committed. LOCK IN SHARE MODE causes shared row locks to be used; FOR ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table.html
An exclusive metadata lock on the table may be taken briefly during preparation and execution phases of the operation. An exclusive metadata lock on the table may be taken briefly during the execution phase of the operation. The exception referred ... ALTER TABLE tbl_name [alter_option [, alter_option] ...] [partition_options] alter_option: { table_options | ADD [COLUMN] col_name column_definition [FIRST | AFTER col_name] | ADD [COLUMN] (col_name column_definition,...) | ADD {INDEX | KEY} [index_name] [index_type] (key_part,...) [index_option] ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instrument-naming.html
Example names: wait/io/file/myisam/log wait/io/file/mysys/charset wait/lock/table/sql/handler wait/synch/cond/mysys/COND_alarm wait/synch/cond/sql/BINLOG::update_cond wait/synch/mutex/mysys/BITMAP_mutex wait/synch/mutex/sql/LOCK_delete ... An ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-table-handles-table.html
The Performance Schema exposes table lock information through the table_handles table to show the table locks currently in effect for each opened table handle. This information shows which table handles the server has open, how they are locked, and ...It is autosized by default; to configure the table size, set the performance_schema_max_table_handles system variable at server ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-rwlock-instances-table.html
The rwlock_instances table lists all the rwlock (read write lock) instances seen by the Performance Schema while the server executes. An rwlock is a synchronization mechanism used in the code to enforce that threads at a given time can have access ...
https://dev.mysql.com/doc/refman/8.0/en/added-deprecated-removed.html
lock_order_debug_loop: Whether to cause debug assert when LOCK_ORDER tool encounters dependency flagged as loop. lock_order_debug_missing_arc: Whether to cause debug assert when LOCK_ORDER tool encounters undeclared dependency. Options and ...
https://dev.mysql.com/doc/refman/8.0/en/create-table-foreign-keys.html
Locking MySQL extends metadata locks, as necessary, to tables that are related by a foreign key constraint. Extending metadata locks prevents conflicting DML and DDL operations from executing concurrently on related tables. If a table is locked ...