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https://dev.mysql.com/doc/refman/8.4/en/window-function-descriptions.html
LAG() (and the similar LEAD() function) are often used to compute differences between rows. The last row shows the same thing when there is no next row for LEAD(). LAG() and LEAD() also serve to compute sums rather than differences. LEAD(expr [, N[, ... This section describes nonaggregate window functions that, for each row from a query, perform a calculation using rows related to that ...
https://dev.mysql.com/doc/mysql-errors/8.4/en/server-error-reference.html
Error number: 1557; Symbol: ER_FOREIGN_DUPLICATE_KEY_OLD_UNUSED; SQLSTATE: 23000 Message: Upholding foreign key constraints for table '%s', entry '%s', key %d would lead to a duplicate entry Error number: 1558; Symbol: ... The MySQL server writes ...
https://dev.mysql.com/doc/refman/8.4/en/fulltext-boolean.html
InnoDB full-text search does not support the use of a leading plus sign with wildcard ('+*'), a plus and minus sign combination ('+-'), or leading a plus and minus sign combination ('+-apple'). The boolean full-text search capability supports the ...
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-6.html
(Bug #37704514) Performance: Redundant conditions in some queries optimized away in MySQL 8.0 were no longer removed in later versions, leading to a significant drop in the performance of such queries. This occurred when the transaction coordinator ... Note These release notes were created with the assistance of MySQL HeatWave ...
https://dev.mysql.com/doc/refman/8.4/en/server-system-variables.html
If a tag value of tag is specified, it is appended to the server identifier with a leading hyphen, resulting in a syslog identifier of mysqld-tag (or MySQL-tag on Windows). However, if you have many large triggers on your tables that cause a high ...
https://dev.mysql.com/doc/refman/8.4/en/string-functions.html
TRIM([{BOTH | LEADING | TRAILING} [remstr] FROM] str), TRIM([remstr FROM] str) Returns the string str with all remstr prefixes or suffixes removed. If none of the specifiers BOTH, LEADING, or TRAILING is given, BOTH is assumed. mysql> SELECT TRIM(' ...For functions that operate on string positions, the first position is numbered ...
https://dev.mysql.com/doc/relnotes/mysql/8.4/en/news-8-4-0.html
This backlog of transactions to apply can be monitored using the performance_schema.replication_applier_status_by_worker table, but there was no information about it in the error log, which could lead to the mistaken impression that the server was ...(Bug #36301441) Audit log filtering by type, using error as the type, did not work ...
https://dev.mysql.com/doc/refman/8.4/en/mysql-cluster-ndbd-definition.html
DataMemory can be changed, but decreasing it can be risky; doing so can easily lead to a node or even an entire NDB Cluster that is unable to restart due to there being insufficient memory space. Because full parallelism in such cases can lead to ...
https://dev.mysql.com/doc/refman/8.4/en/optimizer-hints.html
If the hint includes no leading @query_block_name, the hint applies to the query block in which it occurs. If the hint includes no leading @query_block_name, the hint applies to the query block in which it occurs. If the hint includes no leading ...
https://dev.mysql.com/doc/refman/8.4/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 14.2, “Loadable Function Reference”. ->> Return value ...