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https://dev.mysql.com/doc/refman/5.7/en/partitioning-pruning.html
Important Invalid DATE and DATETIME values referenced in the WHERE condition of a statement against a partitioned table are treated as NULL. The core concept behind partition pruning is relatively simple, and can be described as “Do not scan ...
https://dev.mysql.com/doc/refman/5.7/en/sys-statement-performance-analyzer.html
If in_table is NULL and no snapshot exists, a new snapshot is created. Creates a report of the statements running on the server. The views are calculated based on the overall and/or delta activity. This procedure disables binary logging during its ...
https://dev.mysql.com/doc/refman/5.7/en/built-in-function-reference.html
The following table lists each built-in (native) function and operator and provides a short description of each one. For a table listing functions that are loadable at runtime, see Section 12.2, “Loadable Function Reference”. ->> Return value ...
https://dev.mysql.com/doc/refman/5.7/en/gis-wkb-functions.html
The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the WKB or SRID argument is NULL. The result is NULL if the ... These functions take as arguments a BLOB containing a Well-Known Binary (WKB) representation and, optionally, a spatial reference system identifier ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-online-add-node-example.html
In this section we provide a detailed example illustrating how to add new NDB Cluster data nodes online, starting with an NDB Cluster having 2 data nodes in a single node group and concluding with a cluster having 4 data nodes in 2 node groups.
https://dev.mysql.com/doc/refman/5.7/en/fulltext-natural-language.html
By default or with the IN NATURAL LANGUAGE MODE modifier, the MATCH() function performs a natural language search for a string against a text collection. A collection is a set of one or more columns included in a FULLTEXT index. For each row in the ...
https://dev.mysql.com/doc/refman/5.7/en/alter-table.html
Running ALTER TABLE tbl_name ENGINE=INNODB on an existing InnoDB table performs a “null” ALTER TABLE operation, which can be used to defragment an InnoDB table, as described in Section 14.12.4, “Defragmenting a Table”. The outcome of ...
https://dev.mysql.com/doc/refman/5.7/en/type-conversion.html
The following rules describe how conversion occurs for comparison operations: If one or both arguments are NULL, the result of the comparison is NULL, except for the NULL-safe <=> equality comparison operator. When an operator is used with operands ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-row-format.html
An SQL NULL value reserves one or two bytes in the record directory. An SQL NULL value reserves zero bytes in the data part of the record if stored in a variable-length column. Reserving fixed space for NULL values permits columns to be updated in ... The row format of a table determines how its rows are physically stored, which in turn can affect the performance of queries and DML ...
https://dev.mysql.com/doc/refman/5.7/en/locking-service.html
Namespace and lock names must be non-NULL, nonempty, and have a maximum length of 64 characters. A namespace or lock name specified as NULL, the empty string, or a string longer than 64 characters results in an ER_LOCKING_SERVICE_WRONG_NAME error.