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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/mysql-cluster-mgm-client-commands.html
CREATE NODEGROUP nodeid[, nodeid, ...] Creates a new NDB Cluster node group and causes data nodes to join it. This command is used after adding new data nodes online to an NDB Cluster, and causes them to join a new node group and thus to begin ...
https://dev.mysql.com/doc/refman/5.7/en/replication-options-replica.html
Important Replication filters cannot be used on a MySQL server instance that is configured for Group Replication, because filtering transactions on some servers would make the group unable to reach agreement on a consistent state. Important ... This ...
https://dev.mysql.com/doc/refman/5.7/en/server-system-variables.html
group_concat_max_len Command-Line Format --group-concat-max-len=# System Variable group_concat_max_len Scope Global, Session Dynamic Yes Type Integer Default Value 1024 Minimum Value 4 Maximum Value (64-bit platforms) 18446744073709551615 Maximum ...