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https://dev.mysql.com/doc/refman/8.0/en/security-options.html
The following table shows mysqld options and system variables that affect security. For descriptions of each of these, see Section 7.1.7, “Server Command Options”, and Section 7.1.8, “Server System Variables”.
https://dev.mysql.com/doc/refman/8.0/en/subquery-optimization.html
Note A limitation on UPDATE and DELETE statements that use a subquery to modify a single table is that the optimizer does not use semijoin or materialization subquery optimizations. As a workaround, try rewriting them as multiple-table UPDATE and ...
https://dev.mysql.com/doc/refman/8.0/en/sys-innodb-buffer-stats-by-schema.html
Do not query these views on a production system unless you are aware of the performance impact and have determined it to be acceptable. To avoid impacting performance on a production system, reproduce the issue you want to investigate and query ...
https://dev.mysql.com/doc/refman/8.0/en/sys-io-global-by-file-by-bytes.html
By default, rows are sorted by descending total I/O (bytes read and written). The io_global_by_file_by_bytes and x$io_global_by_file_by_bytes views have these columns: file The file path name. total The total number of bytes read and written for the ... These views summarize global I/O consumers to display amount of I/O, grouped by ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-examples-compression-sect.html
Compressing or uncompressing pages has consumed less than a second since the time the statistics were reset, because the columns COMPRESS_TIME and UNCOMPRESS_TIME are zero. Example 17.1 Using the Compression Information Schema Tables The following ...The following table shows the contents of INFORMATION_SCHEMA.INNODB_CMP under a light ...
https://dev.mysql.com/doc/refman/8.0/en/sys-io-by-thread-by-latency.html
These views summarize I/O consumers to display time waiting for I/O, grouped by thread. The io_by_thread_by_latency and x$io_by_thread_by_latency views have these columns: user For foreground threads, the account associated with the thread.
https://dev.mysql.com/doc/refman/8.0/en/sys-io-global-by-file-by-latency.html
These views summarize global I/O consumers to display time waiting for I/O, grouped by file. The io_global_by_file_by_latency and x$io_global_by_file_by_latency views have these columns: file The file path name. total_latency The total wait time of ...count_read The total number of read I/O events for the ...
https://dev.mysql.com/doc/refman/8.0/en/conditions-and-parameters.html
If a stored procedure exits with an unhandled exception, modified values of OUT and INOUT parameters are not propagated back to the caller. If an exception is handled by a CONTINUE or EXIT handler that contains a RESIGNAL statement, execution of ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-requirements-and-limitations.html
This section lists and explains the requirements and limitations of Group Replication.
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instrument-filtering.html
The setup_instruments table lists the available instruments: mysql> SELECT NAME, ENABLED, TIMED FROM performance_schema.setup_instruments; +---------------------------------------------------+---------+-------+ | NAME | ENABLED | TIMED | ...| ...