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https://dev.mysql.com/doc/refman/8.0/en/view-syntax.html
The CREATE VIEW statement creates a new view (see Section 15.1.23, “CREATE VIEW Statement”). To alter the definition of a view or drop a view, use ALTER VIEW (see Section 15.1.11, “ALTER VIEW Statement”), or DROP VIEW (see Section 15.1.35, ...
https://dev.mysql.com/doc/refman/8.0/en/optimize-overview.html
As you work on database performance, you start by learning the high-level rules and guidelines for the software side, and measuring performance using wall-clock time. Advanced users look for opportunities to improve the MySQL software itself, or ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-stage-tables.html
For additional information about configuring event collection, see Section 29.3, “Performance Schema Startup Configuration”, and Section 29.4, “Performance Schema Runtime Configuration”. The Performance Schema tables provide a container to ... The Performance Schema instruments stages, which are steps during the statement-execution process, such as parsing a statement, opening a table, or performing a filesort ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-trx-table.html
TRX_WAIT_STARTED The time when the transaction started waiting on the lock, if TRX_STATE is LOCK WAIT; otherwise NULL. Whether to relinquish the search latch immediately for the adaptive hash index, or reserve it across calls from MySQL. During ...
https://dev.mysql.com/doc/refman/8.0/en/replication-administration-skip.html
You can use mysqlbinlog to retrieve and display the events that were logged around the time of the error. For instructions to do this, see Section 9.5, “Point-in-Time (Incremental) Recovery”. 19.1.7.3.2 Skipping Transactions Without GTIDs To ...
https://dev.mysql.com/doc/refman/8.0/en/window-functions-frames.html
MySQL permits a frame clause for such functions but ignores it. (For details about the permitted units specifiers, see the description of the DATE_ADD() function in Section 14.7, “Date and Time Functions”.) RANGE on a numeric or temporal expr ...
https://dev.mysql.com/doc/refman/8.0/en/delete.html
To ensure that a given DELETE statement does not take too much time, the MySQL-specific LIMIT row_count clause for DELETE specifies the maximum number of rows to be deleted. The IGNORE modifier causes MySQL to ignore ignorable errors during the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-processlist-table.html
Important INFORMATION_SCHEMA.PROCESSLIST is deprecated and subject to removal in a future MySQL release. The MySQL process list indicates the operations currently being performed by the set of threads executing within the server. TIME The time in ...As such, the implementation of SHOW PROCESSLIST which uses this table is also ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-deadlocks-handling.html
In particular, do not leave an interactive mysql session open for a long time with an uncommitted transaction. With MySQL table-level locks, the timeout method must be used to resolve deadlocks. You can cope with deadlocks and reduce the likelihood ... This section builds on the conceptual information about deadlocks in Section 17.7.5.2, “Deadlock ...
https://dev.mysql.com/doc/refman/8.0/en/replication-sbr-rbr.html
If there is an error in evaluation on the replica, particularly when executing complex statements, statement-based replication may slowly increase the margin of error across the affected rows over time. As of MySQL 8.0.22, DML operations that read ...For most users, the mixed replication format should provide the best combination of data integrity and ...