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https://dev.mysql.com/doc/refman/8.0/en/external-locking.html
External locking is the use of file system locking to manage contention for MyISAM database tables by multiple processes. External locking is used in situations where a single process such as the MySQL server cannot be assumed to be the only ...The ...
https://dev.mysql.com/doc/refman/8.0/en/lock-instance-for-backup.html
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 snapshot. Executing the LOCK INSTANCE ...The BACKUP_ADMIN privilege is automatically granted to users with the RELOAD privilege when performing an in-place upgrade to MySQL 8.0 from an earlier ...
https://dev.mysql.com/doc/refman/8.0/en/table-locking.html
InnoDB tables use row-level locking so that multiple sessions and applications can read from and write to the same table simultaneously, without making each other wait or producing inconsistent results. For this storage engine, avoid using the LOCK ...But because only one session can write to a table at any one time, for best performance with these other storage engines, use them primarily for tables that are queried often and rarely inserted into or ...
https://dev.mysql.com/doc/refman/8.0/en/account-locking.html
MySQL supports locking and unlocking user accounts using the ACCOUNT LOCK and ACCOUNT UNLOCK clauses for the CREATE USER and ALTER USER statements: When used with CREATE USER, these clauses specify the initial locking state for a new account. In ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-locking-transaction-model.html
To implement a large-scale, busy, or highly reliable database application, to port substantial code from a different database system, or to tune MySQL performance, it is important to understand InnoDB locking and the InnoDB transaction model. This ...
https://dev.mysql.com/doc/refman/8.0/en/locking-issues.html
MySQL manages contention for table contents using locking: Internal locking is performed within the MySQL server itself to manage contention for table contents by multiple threads. This type of locking is internal because it is performed entirely ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-lock-tables.html
The Performance Schema exposes lock information through these tables: data_locks: Data locks held and requested data_lock_waits: Relationships between data lock owners and data lock requestors blocked by those owners metadata_locks: Metadata locks ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-metadata-locks-table.html
MySQL uses metadata locking to manage concurrent access to database objects and to ensure data consistency; see Section 10.11.4, “Metadata Locking”. Metadata locking applies not just to tables, but also to schemas, stored programs (procedures, ...The value is one of INTENTION_EXCLUSIVE, SHARED, SHARED_HIGH_PRIO, SHARED_READ, SHARED_WRITE, SHARED_UPGRADABLE, SHARED_NO_WRITE, SHARED_NO_READ_WRITE, or ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-locks-table.html
For information about which lock requests are blocked by which held locks, see Section 29.12.13.2, “The data_lock_waits Table”. Example data lock information: mysql> SELECT * FROM performance_schema.data_locks\G *************************** 1.
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-examples.html
Note This section describes locking information as exposed by the Performance Schema data_locks and data_lock_waits tables, which supersede the INFORMATION_SCHEMA INNODB_LOCKS and INNODB_LOCK_WAITS tables in MySQL 8.0. For similar discussion ...