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https://dev.mysql.com/doc/refman/8.0/en/audit-log-file-formats.html
The MySQL server calls the audit log plugin to write an audit record to its log file whenever an auditable event occurs. <AUDIT_RECORD> <TIMESTAMP>2019-10-03T14:09:38 UTC</TIMESTAMP> <RECORD_ID>6_2019-10-03T14:06:33</RECORD_ID> <NAME>Query</NAME> ...Typically the first audit record written after plugin startup contains the server description and startup ...
https://dev.mysql.com/doc/refman/8.0/en/example-foreign-keys.html
To demonstrate ON DELETE and ON UPDATE referential actions, drop the child table and recreate it to include ON UPDATE and ON DELETE subclauses with the CASCADE option. MySQL supports foreign keys, which permit cross-referencing related data across ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-quick-start.html
To see the structure of individual tables, use SHOW CREATE TABLE: mysql> SHOW CREATE TABLE performance_schema.setup_consumers\G *************************** 1. row *************************** Table: setup_consumers Create Table: CREATE TABLE ...The ... This section briefly introduces the Performance Schema with examples that show how to use ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-threads-table.html
If the thread spawns a subthread, matching occurs again for the threads table row created for the subthread. If the thread spawns a subthread, matching occurs again for the threads table row created for the subthread. The threads table contains a ...Each row contains information about a thread and indicates whether monitoring and historical event logging are enabled for it: mysql> SELECT * FROM performance_schema.threads\G *************************** ...
https://dev.mysql.com/doc/refman/8.0/en/view-updatability.html
For information about generated columns, see Section 15.1.20.8, “CREATE TABLE and Generated Columns”. Consider this view: CREATE VIEW v AS SELECT col1, 1 AS col2 FROM t; This view is not insertable because col2 is an expression. Some views are ...For dependent subqueries in the select list, no data change statements are ...
https://dev.mysql.com/doc/refman/8.0/en/myisam-repair.html
In this case, you must use ALTER TABLE to increase the MAX_ROWS and AVG_ROW_LENGTH table option values: ALTER TABLE tbl_name MAX_ROWS=xxx AVG_ROW_LENGTH=yyy; If you do not know the current table option values, use SHOW CREATE TABLE. Use the table ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-range.html
A table that is partitioned by range is partitioned in such a way that each partition contains rows for which the partitioning expression value lies within a given range. While the examples work as shown for purposes of the present discussion, you ...Ranges should be contiguous but not overlapping, and are defined using the VALUES LESS THAN ...
https://dev.mysql.com/doc/refman/8.0/en/identifier-qualifiers.html
For example, this statement creates a table using the unqualified name t1: CREATE TABLE t1 (i INT); Because t1 includes no qualifier to specify a database, the statement creates the table in the default database. This statement creates a table using ...ON mydb.mytable ...; A column name may be given multiple qualifiers to indicate context in statements that reference it, as shown in the following ...
https://dev.mysql.com/doc/refman/8.0/en/semijoins.html
A semijoin is a preparation-time transformation that enables multiple execution strategies such as table pullout, duplicate weedout, first match, loose scan, and materialization. For an inner join between two tables, the join returns a row from one ...The optimizer uses semijoin strategies to improve subquery execution, as described in this ...
https://dev.mysql.com/doc/refman/8.0/en/replica-logs-status.html
Before MySQL 8.0, to create the replication metadata repositories as tables, it was necessary to specify master_info_repository=TABLE and relay_log_info_repository=TABLE at server startup. From MySQL 8.0, creating the replication metadata ... A ...