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https://dev.mysql.com/doc/refman/5.7/en/sys-schema-unused-indexes.html
These views display indexes for which there are no events, which indicates that they are not being used. This view is most useful when the server has been up and processing long enough that its workload is representative. Otherwise, presence of an ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema.html
MySQL 5.7 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/5.7/en/sys-statements-with-full-table-scans.html
These views display normalized statements that have done full table scans. By default, rows are sorted by descending percentage of time a full scan was done and descending total latency. The statements_with_full_table_scans and ...
https://dev.mysql.com/doc/refman/5.7/en/system-variable-privileges.html
A system variable can have a global value that affects server operation as a whole, a session value that affects only the current session, or both. This section describes the privileges required to assign values to system variables at runtime.
https://dev.mysql.com/doc/refman/5.7/en/table-locking.html
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 producing inconsistent results. For this storage engine, avoid using the LOCK ...
https://dev.mysql.com/doc/refman/5.7/en/tutorial.html
This chapter provides a tutorial introduction to MySQL by showing how to use the mysql client program to create and use a simple database. mysql (sometimes referred to as the “terminal monitor” or just “monitor”) is an interactive program ...
https://dev.mysql.com/doc/refman/5.7/en/using-date.html
You should use this format in UPDATE expressions and in the WHERE clause of SELECT statements. For example: SELECT * FROM t1 WHERE date >= '2003-05-05'; As a convenience, MySQL automatically converts a date to a number if the date is used in numeric ...
https://dev.mysql.com/doc/refman/5.7/en/view-algorithms.html
The optional ALGORITHM clause for CREATE VIEW or ALTER VIEW is a MySQL extension to standard SQL. For MERGE, the text of a statement that refers to the view and the view definition are merged such that parts of the view definition replace ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-files-table.html
For NDB: The name of an UNDO log file created by CREATE LOGFILE GROUP or ALTER LOGFILE GROUP, or of a data file created by CREATE TABLESPACE or ALTER TABLESPACE. For NDB: The name of the log file group to which the log file or data file belongs. For ... The FILES table provides information about the files in which MySQL tablespace data is ...
https://dev.mysql.com/doc/refman/5.7/en/windows-pluggable-authentication.html
Windows pluggable authentication uses the identity of the client to check whether it is a given account or a member of a group. Suppose that the Windows users Rafal and Tasha should be permitted to connect to MySQL, as well as any users in the ...