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https://dev.mysql.com/doc/refman/5.7/en/xa-statements.html
To perform XA transactions in MySQL, use the following statements: XA {START|BEGIN} xid [JOIN|RESUME] XA END xid [SUSPEND [FOR MIGRATE]] XA PREPARE xid XA COMMIT xid [ONE PHASE] XA ROLLBACK xid XA RECOVER [CONVERT XID] For XA START, the JOIN and ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-variable-table-migration.html
Before MySQL 5.7.9, selecting from the INFORMATION_SCHEMA tables produces an empty result set plus a deprecation warning. The INFORMATION_SCHEMA has tables that contain system and status variable information (see Section 24.3.11, “The ...
https://dev.mysql.com/doc/refman/5.7/en/midpoint-insertion.html
By default, the key cache management system uses a simple LRU strategy for choosing key cache blocks to be evicted, but it also supports a more sophisticated method called the midpoint insertion strategy. key_cache_division_limit is a component of ...When using the midpoint insertion strategy, the LRU chain is divided into two parts: a hot sublist and a warm ...
https://dev.mysql.com/doc/refman/5.7/en/group-replication-single-primary-mode.html
In this mode the group has a single-primary server that is set to read-write mode. All the other members in the group are set to read-only mode (with super-read-only=ON ). The primary is typically the first server to bootstrap the group, all other ...Upon primary member failure, an automatic primary election mechanism chooses the new primary ...
https://dev.mysql.com/doc/refman/5.7/en/charset-collation-effect.html
The second column shows the result of the SELECT using the German DIN-1 rule, which says that U-umlaut sorts with U. The third column shows the result of the SELECT using the German DIN-2 rule, which says that U-umlaut sorts with UE.
https://dev.mysql.com/doc/refman/5.7/en/information-schema-collations-table.html
The COLLATIONS table provides information about collations for each character set. IS_DEFAULT Whether the collation is the default for its character set. CHARACTER_SET_NAME The name of the character set with which the collation is associated.
https://dev.mysql.com/doc/refman/5.7/en/savepoint.html
SAVEPOINT identifier ROLLBACK [WORK] TO [SAVEPOINT] identifier RELEASE SAVEPOINT identifier InnoDB supports the SQL statements SAVEPOINT, ROLLBACK TO SAVEPOINT, RELEASE SAVEPOINT and the optional WORK keyword for ROLLBACK. The SAVEPOINT statement ...The ROLLBACK TO SAVEPOINT statement rolls back a transaction to the named savepoint without terminating the ...
https://dev.mysql.com/doc/refman/5.7/en/bit-functions.html
Table 12.17 Bit Functions and Operators Name Description & Bitwise AND >> Right shift << Left shift ^ Bitwise XOR BIT_COUNT() Return the number of bits that are set | Bitwise OR ~ Bitwise inversion The following list describes available bit ...
https://dev.mysql.com/doc/refman/5.7/en/comparison-operators.html
The following relational comparison operators can be used to compare not only scalar operands, but row operands: = > < >= <= <> != The descriptions for those operators later in this section detail how they work with row operands. For additional ...
https://dev.mysql.com/doc/refman/5.7/en/create-logfile-group.html
The optional UNDO_BUFFER_SIZE parameter sets the size used by the UNDO buffer for the log file group; The default value for UNDO_BUFFER_SIZE is 8M (eight megabytes); this value cannot exceed the amount of system memory available. This includes any ...For rules covering the naming of log file groups, see Section 9.2, “Schema Object ... CREATE LOGFILE GROUP logfile_group ADD UNDOFILE 'undo_file' [INITIAL_SIZE [=] initial_size] [UNDO_BUFFER_SIZE [=] undo_buffer_size] [REDO_BUFFER_SIZE [=] redo_buffer_size] [NODEGROUP [=] nodegroup_id] [WAIT] [COMMENT [=] 'string'] ENGINE [=] engine_name This statement ...