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https://dev.mysql.com/doc/refman/8.0/en/subquery-optimization-with-exists.html
Replace a comparison that looks like this: outer_expr [NOT] IN (SELECT inner_expr FROM ...) with this expression: (outer_expr IS NOT NULL) AND (outer_expr [NOT] IN (SELECT inner_expr FROM ...)) Then NULL IN (SELECT ...) is never evaluated because ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-restrictions.html
In general, you cannot modify a table and select from the same table in a subquery. For example, this limitation applies to statements of the following forms: DELETE FROM t WHERE ... FROM t ...); Exception: The preceding prohibition does not apply ...
https://dev.mysql.com/doc/refman/8.0/en/symbolic-links.html
You can move databases or tables from the database directory to other locations and replace them with symbolic links to the new locations. You might want to do this, for example, to move a database to a file system with more free space or increase ...
https://dev.mysql.com/doc/refman/8.0/en/sys-format-statement.html
Otherwise, the middle part of the string is replaced by an ellipsis (...). Given a string (normally representing an SQL statement), reduces it to the length given by the statement_truncate_len configuration option, and returns the result. This ...
https://dev.mysql.com/doc/refman/8.0/en/sys-metrics.html
This view summarizes MySQL server metrics to show variable names, values, types, and whether they are enabled. The metric type determines the source from which the name is taken: For global status variables: The VARIABLE_NAME column of the ...
https://dev.mysql.com/doc/refman/8.0/en/sys-ps-trace-thread.html
Dumps all Performance Schema data for an instrumented thread to a .dot formatted graph file (for the DOT graph description language). Each result set returned from the procedure should be used for a complete graph. This procedure disables binary ...
https://dev.mysql.com/doc/refman/8.0/en/sys-schema-object-index.html
The following tables list sys schema objects and provide a short description of each one.
https://dev.mysql.com/doc/refman/8.0/en/sys-statement-performance-analyzer.html
Creates a report of the statements running on the server. The views are calculated based on the overall and/or delta activity. This procedure disables binary logging during its execution by manipulating the session value of the sql_log_bin system ...
https://dev.mysql.com/doc/refman/8.0/en/table.html
With INSERT and REPLACE statements, where you would otherwise use SELECT *. TABLE is a DML statement introduced in MySQL 8.0.19 which returns rows and columns of the named table. Given the existence of a table named t, the following two statements ...
https://dev.mysql.com/doc/refman/8.0/en/uln-installation.html
If you are changing your package source to use ULN and not changing which build of MySQL you are using, then back up your data, remove your existing binaries, and replace them with those from ULN. Linux supports a number of different solutions for ...