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https://dev.mysql.com/doc/refman/9.7/en/non-typed-operators.html
->> Return value from JSON column after evaluating path and unquoting the result; equivalent to JSON_UNQUOTE(JSON_EXTRACT()). / Division operator := Assign a value = Assign a value (as part of a SET statement, or as part of the SET clause in an ...
https://dev.mysql.com/doc/refman/9.7/en/optimize-blob.html
When storing a large blob containing textual data, consider compressing it first. Do not use this technique when the entire table is compressed by InnoDB or MyISAM. For a table with several columns, to reduce memory requirements for queries that do ...
https://dev.mysql.com/doc/refman/9.7/en/option-modifiers.html
Some options are “boolean” and control behavior that can be turned on or off. For example, the mysql client supports a --column-names option that determines whether or not to display a row of column names at the beginning of query results.
https://dev.mysql.com/doc/refman/9.7/en/outer-join-simplification.html
Table expressions in the FROM clause of a query are simplified in many cases. At the parser stage, queries with right outer join operations are converted to equivalent queries containing only left join operations. When the optimizer evaluates plans ...
https://dev.mysql.com/doc/refman/9.7/en/performance-schema-variables-metadata-table.html
The variables_metadata table shows, for each server system variable, its name, scope, type, range of values (where applicable), and description. VARIABLE_SCOPE The variable's scope; this is one of the values listed here: GLOBAL The variable is ...
https://dev.mysql.com/doc/refman/9.7/en/replication-gtids-failover.html
There are a number of techniques when using MySQL Replication with Global Transaction Identifiers (GTIDs) for provisioning a new replica which can then be used for scaleout, being promoted to source as necessary for failover. Each identifier ...
https://dev.mysql.com/doc/refman/9.7/en/replication-gtids-functions.html
This section provides examples of stored functions (see Chapter 27, Stored Objects) which you can create using some of the built-in functions provided by MySQL for use with GTID-based replication, listed here: GTID_SUBSET(): Shows whether one GTID ...
https://dev.mysql.com/doc/refman/9.7/en/replication-options-replica.html
This section explains the server options and system variables that apply to replica servers and contains the following: Startup Options for Replica Servers System Variables Used on Replica Servers Specify the options either on the command line or ...
https://dev.mysql.com/doc/refman/9.7/en/rewriter-query-rewrite-plugin-usage.html
To enable or disable the plugin, enable or disable the rewriter_enabled system variable. By default, the Rewriter plugin is enabled when you install it (see Section 7.6.4.1, “Installing or Uninstalling the Rewriter Query Rewrite Plugin”). To ...
https://dev.mysql.com/doc/refman/9.7/en/row-subqueries.html
Scalar or column subqueries return a single value or a column of values. A row subquery is a subquery variant that returns a single row and can thus return more than one column value. If this row has col3 and col4 values equal to the col1 and col2 ...