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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 ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-tuning.html
For example, blocks could occur in code that has not been instrumented with thread pool callbacks. This section provides guidelines on determining the best configuration for thread pool performance, as measured using a metric such as transactions ...
https://dev.mysql.com/doc/refman/8.0/en/tuning-trace-purging.html
A user who wants to see the trace of a different substatement can enable or disable tracing for the desired substatement, but this requires editing the routine code, which may not always be possible. Thus, if a statement contains substatements (such ...
https://dev.mysql.com/doc/refman/8.0/en/verifying-md5-checksum.html
After you have downloaded a MySQL package, you should make sure that its MD5 checksum matches the one provided on the MySQL download pages. Each package has an individual checksum that you can verify against the package that you downloaded. The ...
https://dev.mysql.com/doc/refman/8.0/en/which-version.html
You want to read or modify the C and C++ code that makes up MySQL. When preparing to install MySQL, decide which version and distribution format (binary or source) to use. First, decide whether to install from a bugfix series like MySQL 8.4, or use ...
https://dev.mysql.com/doc/refman/8.0/en/windows-installation.html
The source distribution format contains all the code and support files for building the executables using the Visual Studio compiler system. Important MySQL 8.0 Server requires the Microsoft Visual C++ 2019 Redistributable Package to run on Windows ...