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https://dev.mysql.com/doc/refman/8.0/en/show-engine.html
Use SHOW ENGINE PERFORMANCE_SCHEMA STATUS to inspect the internal operation of the Performance Schema code: mysql> SHOW ENGINE PERFORMANCE_SCHEMA STATUS\G ... SHOW ENGINE engine_name {STATUS | MUTEX} SHOW ENGINE displays operational information ...
https://dev.mysql.com/doc/refman/8.0/en/sql-compound-statements.html
These objects are defined in terms of SQL code that is stored on the server for later invocation (see Chapter 27, Stored Objects). END compound statement and other statements that can be used in the body of stored programs: Stored procedures and ...
https://dev.mysql.com/doc/refman/8.0/en/statement-labels.html
[begin_label:] BEGIN [statement_list] END [end_label] [begin_label:] LOOP statement_list END LOOP [end_label] [begin_label:] REPEAT statement_list UNTIL search_condition END REPEAT [end_label] [begin_label:] WHILE search_condition DO statement_list ...
https://dev.mysql.com/doc/refman/8.0/en/storage-engines.html
Example: This engine serves as an example in the MySQL source code that illustrates how to begin writing new storage engines. Storage engines are MySQL components that handle the SQL operations for different table types. InnoDB is the default and ...
https://dev.mysql.com/doc/refman/8.0/en/stored-objects.html
This chapter discusses stored database objects that are defined in terms of SQL code that is stored on the server for later execution. Stored objects include these object types: Stored procedure: An object created with CREATE PROCEDURE and invoked ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-optimization-with-exists.html
row *************************** Level: Note Code: 1003 Message: select `test`.`t1`.`col1` AS `col1`, <in_optimizer>(`test`.`t1`.`col1`, <exists>(<index_lookup>(<cache>(`test`.`t1`.`col1`) in t2 on key1 checking NULL where (`test`.`t2`.`col2` = ...
https://dev.mysql.com/doc/refman/8.0/en/sys-processlist.html
source The source file and line number containing the instrumented code that produced the event. The MySQL process list indicates the operations currently being performed by the set of threads executing within the server. They provide more complete ...
https://dev.mysql.com/doc/refman/8.0/en/table-locking.html
You could change the locking code in mysys/thr_lock.c to use a single queue. 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 ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-elements.html
Prior to MySQL 8.0.14, the monitoring tables are INFORMATION_SCHEMA tables; see Section 28.5, “INFORMATION_SCHEMA Thread Pool Tables”. The INFORMATION_SCHEMA tables now are deprecated; expect them to be removed in a future version of MySQL.
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-operation.html
One thread begins executing a statement, becomes blocked, but does not report back that it is blocked because the block does not occur in code that has been instrumented with thread pool callbacks. The thread pool consists of a number of thread ...