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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-processlist-table.html
This implementation queries active thread data from the Performance Schema rather than the thread manager and does not require a mutex. The MySQL process list indicates the operations currently being performed by the set of threads executing within ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-digests.html
For example, table columns that show wait times, lock times, or index use may highlight types of queries that are inefficient. The MySQL server is capable of maintaining statement digest information. The digesting process converts each SQL ...
https://dev.mysql.com/doc/refman/8.0/en/replace.html
REPLACE [LOW_PRIORITY | DELAYED] [INTO] tbl_name [PARTITION (partition_name [, partition_name] ...)] [(col_name [, col_name] ...)] { {VALUES | VALUE} (value_list) [, (value_list)] ... | VALUES row_constructor_list } REPLACE [LOW_PRIORITY | DELAYED] ...
https://dev.mysql.com/doc/refman/8.0/en/select-into.html
INTO form of SELECT enables a query result to be stored in variables or written to a file: SELECT ... Column and line terminators can be specified to produce a specific output format. INTO DUMPFILE writes a single row to a file without any ...
https://dev.mysql.com/doc/refman/8.0/en/string-comparison-functions.html
Note Aggregate queries involving NOT LIKE comparisons with columns containing NULL may yield unexpected results. The same is true for aggregate queries involving NULL and comparisons using NOT RLIKE or NOT REGEXP. Table 14.13 String Comparison ...
https://dev.mysql.com/doc/refman/8.0/en/subqueries.html
We say that the subquery is nested within the outer query, and in fact it is possible to nest subqueries within other subqueries, to a considerable depth. The main advantages of subqueries are: They allow queries that are structured so that it is ...
https://dev.mysql.com/doc/refman/8.0/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.22, “CREATE TRIGGER Statement”, and Section 15.1.34, “DROP TRIGGER Statement”. Here is a simple example that associates a ...
https://dev.mysql.com/doc/refman/8.0/en/assignment-operators.html
Table 14.6 Assignment Operators Name Description := Assign a value = Assign a value (as part of a SET statement, or as part of the SET clause in an UPDATE statement) := Assignment operator. Causes the user variable on the left hand side of the ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-reference.html
audit_log_policy Command-Line Format --audit-log-policy=value Deprecated 8.0.34 System Variable audit_log_policy Scope Global Dynamic No SET_VAR Hint Applies No Type Enumeration Default Value ALL Valid Values ALLLOGINSQUERIESNONE Note This ...Unless ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log.html
Note MySQL Enterprise Audit is an extension included in MySQL Enterprise Edition, a commercial product. MySQL Enterprise Edition includes MySQL Enterprise Audit, implemented using a server plugin named audit_log. MySQL Enterprise Audit uses the ...