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https://dev.mysql.com/doc/heatwave-aws/en/heatwave-aws-hw-cluster-failure-and-recovery.html
Tables where partition load or unload operations were in progress when the DB system stopped abruptly. MySQL HeatWave Cluster Data Recovery 4.4 MySQL HeatWave Cluster Data Recovery MySQL HeatWave triggers the data recovery process when: One or more ...
https://dev.mysql.com/doc/refman/8.4/en/archive-storage-engine.html
The ARCHIVE storage engine produces special-purpose tables that store large amounts of unindexed data in a very small footprint. To enable this storage engine if you build MySQL from source, invoke CMake with the -DWITH_ARCHIVE_STORAGE_ENGINE ...
https://dev.mysql.com/doc/refman/8.4/en/blackhole-storage-engine.html
The BLACKHOLE storage engine acts as a “black hole” that accepts data but throws it away and does not store it. To examine the source for the BLACKHOLE engine, look in the sql directory of a MySQL source distribution. When you create a ...
https://dev.mysql.com/doc/refman/8.4/en/clone-plugin-remote.html
Either distribute the files to the recipient host using a secure channel or place them on a mounted partition that is accessible to the recipient host. The clone plugin supports the following syntax for cloning remote data; that is, cloning data ...
https://dev.mysql.com/doc/refman/8.4/en/constant-folding-optimization.html
row *************************** id: 1 select_type: SIMPLE table: t partitions: NULL type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 5 filtered: 20.00 Extra: Using where 1 row in set, 1 warning (0.00 sec) mysql> SHOW WARNINGS; ... Comparisons between constants and column values in which the constant value is out of range or of the wrong type with respect to the column type are now handled once during query optimization rather row-by-row than during ...
https://dev.mysql.com/doc/refman/8.4/en/create-trigger.html
CREATE [DEFINER = user] TRIGGER [IF NOT EXISTS] trigger_name trigger_time trigger_event ON tbl_name FOR EACH ROW [trigger_order] trigger_body trigger_time: { BEFORE | AFTER } trigger_event: { INSERT | UPDATE | DELETE } trigger_order: { FOLLOWS | ...
https://dev.mysql.com/doc/refman/8.4/en/data-dictionary-information-schema.html
In particular, for each INFORMATION_SCHEMA table that is a view on data dictionary tables: The server no longer must create a temporary table for each query of the INFORMATION_SCHEMA table. When the underlying data dictionary tables store values ...
https://dev.mysql.com/doc/refman/8.4/en/descending-indexes.html
MySQL supports descending indexes: DESC in an index definition is no longer ignored but causes storage of key values in descending order. Previously, indexes could be scanned in reverse order but at a performance penalty. A descending index can be ...
https://dev.mysql.com/doc/refman/8.4/en/example-maximum-column-group-row.html
Common table expression with window function: WITH s1 AS ( SELECT article, dealer, price, RANK() OVER (PARTITION BY article ORDER BY price DESC ) AS `Rank` FROM shop ) SELECT article, dealer, price FROM s1 WHERE `Rank` = 1 ORDER BY article; . Task: ...
https://dev.mysql.com/doc/refman/8.4/en/example-storage-engine.html
The EXAMPLE storage engine is a stub engine that does nothing. Its purpose is to serve as an example in the MySQL source code that illustrates how to begin writing new storage engines. To enable the EXAMPLE storage engine if you build MySQL from ...