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https://dev.mysql.com/doc/refman/5.7/en/information-schema-variables-table.html
Note The value of the show_compatibility_56 system variable affects the information available from the tables described here. For details, see the description of that variable in Section 5.1.7, “Server System Variables”. Note Information ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-transaction-model.html
The InnoDB transaction model aims combine the best properties of a multi-versioning database with traditional two-phase locking. InnoDB performs locking at the row level and runs queries as nonlocking consistent reads by default, in the style of ...
https://dev.mysql.com/doc/refman/5.7/en/is-null-optimization.html
MySQL can perform the same optimization on col_name IS NULL that it can use for col_name = constant_value. For example, MySQL can use indexes and ranges to search for NULL with IS NULL. This optimization does not occur in cases when the column ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-configuration.html
This engine is also referred to sometimes as NDBCLUSTER, although NDB is preferred. A MySQL server that is part of an NDB Cluster differs in one chief respect from a normal (nonclustered) MySQL server, in that it employs the NDB storage engine. To ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-file-summary-tables.html
row *************************** EVENT_NAME: wait/io/file/sql/binlog COUNT_STAR: 31 SUM_TIMER_WAIT: 8243784888 MIN_TIMER_WAIT: 0 AVG_TIMER_WAIT: 265928484 MAX_TIMER_WAIT: 6490658832 ... row *************************** FILE_NAME: ... The Performance ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-create-select.html
SELECT statement to make any changes in tables other than the table that is created by the statement. Some older versions of MySQL permitted these statements to do so; this means that, when using replication between a MySQL 5.6 or later replica and ...
https://dev.mysql.com/doc/refman/5.7/en/replication-multi-source-configuration.html
A multi-source replication topology requires at least two sources and one replica configured. In these tutorials, we assume you have two sources source1 and source2, and a replica replicahost. The replica replicates one database from each of the ...
https://dev.mysql.com/doc/refman/5.7/en/x-plugin-encrypted-connections.html
This section explains how to configure X Plugin to use encrypted connections. To enable configuring support for encrypted connections, X Plugin has mysqlx_ssl_xxx system variables, which can have different values from the ssl_xxx system variables ...
https://dev.mysql.com/doc/refman/5.7/en/sys-schema.html
mysql_upgrade returns an error if a sys schema exists but has no version view, on the assumption that absence of this view indicates a user-created sys schema. MySQL 5.7 includes the sys schema, a set of objects that helps DBAs and developers ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-setup-actors-table.html
This table has a maximum size of 100 rows by default. The setup_actors table contains information that determines whether to enable monitoring and historical event logging for new foreground server threads (threads associated with client ...