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https://dev.mysql.com/doc/refman/8.4/en/storage-engines.html
Storage engines are MySQL components that handle the SQL operations for different table types. InnoDB is the default and most general-purpose storage engine, and Oracle recommends using it for tables except for specialized use cases. (The CREATE ...
https://dev.mysql.com/doc/refman/8.4/en/stored-objects-security.html
Stored programs (procedures, functions, triggers, and events) and views are defined prior to use and, when referenced, execute within a security context that determines their privileges. The privileges applicable to execution of a stored object are ...
https://dev.mysql.com/doc/refman/8.4/en/stored-routines-privileges.html
The MySQL grant system takes stored routines into account as follows: The CREATE ROUTINE privilege is needed to create stored routines. The ALTER ROUTINE privilege is needed to alter or drop stored routines. This privilege is granted automatically ...
https://dev.mysql.com/doc/refman/8.4/en/string-comparison-functions.html
Table 14.13 String Comparison Functions and Operators Name Description LIKE Simple pattern matching NOT LIKE Negation of simple pattern matching STRCMP() Compare two strings If a string function is given a binary string as an argument, the ...
https://dev.mysql.com/doc/refman/8.4/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/8.4/en/sys-ps-setup-reset-to-default.html
Parameters in_verbose BOOLEAN: Whether to display information about each setup stage during procedure execution. row *************************** status: Resetting: setup_actors DELETE FROM performance_schema.setup_actors WHERE NOT (HOST = '%' AND ...
https://dev.mysql.com/doc/refman/8.4/en/sys-schema-table-statistics-with-buffer.html
These views summarize table statistics, including InnoDB buffer pool statistics. By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics_with_buffer and ...
https://dev.mysql.com/doc/refman/8.4/en/sys-schema-table-statistics.html
By default, rows are sorted by descending total wait time (tables with most contention first). The schema_table_statistics and x$schema_table_statistics views have these columns: table_schema The schema that contains the table. total_latency The ...
https://dev.mysql.com/doc/refman/8.4/en/sys-schema.html
MySQL 8.4 includes the sys schema, a set of objects that helps DBAs and developers interpret data collected by the Performance Schema. sys schema objects can be used for typical tuning and diagnosis use cases. Objects in this schema include: Views ...
https://dev.mysql.com/doc/refman/8.4/en/sys-sys-config.html
This table contains sys schema configuration options, one row per option. Configuration changes made by updating this table persist across client sessions and server restarts. The sys_config table has these columns: variable The configuration ...