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https://dev.mysql.com/doc/refman/5.7/en/innodb-parameters.html
innodb_flush_method Command-Line Format --innodb-flush-method=value System Variable innodb_flush_method Scope Global Dynamic No Type String Default Value NULL Valid Values (Unix) fsyncO_DSYNClittlesyncnosyncO_DIRECTO_DIRECT_NO_FSYNC Valid Values ...
https://dev.mysql.com/doc/refman/5.7/en/audit-log-file-formats.html
Valid XML characters are: #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF] The following elements are mandatory in every <AUDIT_RECORD> element: <NAME> A string representing the type of instruction that generated the audit ...
https://dev.mysql.com/doc/refman/5.7/en/subquery-optimization-with-exists.html
This section discusses these optimizations, particularly with regard to the challenges that NULL values present. That is, the “pushdown” strategy works as long as both of these conditions are true: outer_expr and inner_expr cannot be NULL.
https://dev.mysql.com/doc/refman/5.7/en/enum.html
Creating and Using ENUM Columns Index Values for Enumeration Literals Handling of Enumeration Literals Empty or NULL Enumeration Values Enumeration Sorting Enumeration Limitations Creating and Using ENUM Columns An enumeration value must be a quoted ... An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-replication-schema.html
Note When performing schema changes on NDB tables, applications should wait until the ALTER TABLE statement has returned in the MySQL client connection that issued the statement before attempting to use the updated definition of the table.
https://dev.mysql.com/doc/refman/5.7/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/5.7/en/gis-polygon-property-functions.html
If the argument is NULL or an empty geometry, the return value is NULL. Such components are extracted and made into a single MultiPolygon, MultiLineString, or MultiPoint for centroid computation. If the argument is an empty geometry collection, the ... Functions in this section return properties of Polygon or MultiPolygon ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-range.html
A table that is partitioned by range is partitioned in such a way that each partition contains rows for which the partitioning expression value lies within a given range. Ranges should be contiguous but not overlapping, and are defined using the ...
https://dev.mysql.com/doc/refman/5.7/en/charset-literal.html
Every character string literal has a character set and a collation. For the simple statement SELECT 'string', the string has the connection default character set and collation defined by the character_set_connection and collation_connection system ...Examples: SELECT 'abc'; SELECT _latin1'abc'; SELECT _binary'abc'; SELECT _utf8'abc' COLLATE utf8_danish_ci; Character set introducers and the COLLATE clause are implemented according to standard SQL ...
https://dev.mysql.com/doc/refman/5.7/en/case-sensitivity.html
For nonbinary strings (CHAR, VARCHAR, TEXT), string searches use the collation of the comparison operands. For binary strings (BINARY, VARBINARY, BLOB), comparisons use the numeric values of the bytes in the operands; this means that for alphabetic ...Simple comparison operations (>=, >, =, <, <=, sorting, and grouping) are based on each character's “sort value.” Characters with the same sort value are treated as the same ...