Search Results
https://dev.mysql.com/doc/refman/8.4/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/mysql-monitor/8.0/en/mem-graphs-lock-waits-ref.html
To open the Lock Waits reports, select Lock Waits from the Reports & Graphs menu. InnoDB Row Lock Waits This report retrieves data on InnoDB row locks from sys.x$innodb_lock_waits. For more information on the data retrieved in this report, see The ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/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/mysql-monitor/8.0/en/mem-graphs-database-fileio-lock-wait.html
This chapter describes the Database File I/O and Lock Waits reports. These reports identify I/O hot spots and lock wait contention in your application using the sys schema, thereby enabling you to tune the performance of your queries. Important The ...
https://dev.mysql.com/doc/internals/en/replication-locks.html
Status of this subsection: not started 2009-10-21 ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/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/8.4/en/innodb-information-schema-examples.html
This section describes the use of locking information as exposed by the Performance Schema data_locks and data_lock_waits tables. Identifying Blocking Transactions It is sometimes helpful to identify which transaction blocks another. The tables ...
https://dev.mysql.com/doc/refman/8.4/en/lock-order-tool.html
The MySQL server is a multithreaded application that uses numerous internal locking and lock-related primitives, such as mutexes, rwlocks (including prlocks and sxlocks), conditions, and files. Within the server, the set of lock-related objects ...