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https://dev.mysql.com/doc/refman/8.0/en/fulltext-natural-language.html
If you create a MyISAM table and insert only one or two rows of text into it, every word in the text occurs in at least 50% of the rows. For each row in the table, MATCH() returns a relevance value; that is, a similarity measure between the search ... By default or with the IN NATURAL LANGUAGE MODE modifier, the MATCH() function performs a natural language search for a string against a text ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-instrument-naming.html
Example names: wait/io/file/myisam/log wait/io/file/mysys/charset wait/lock/table/sql/handler wait/synch/cond/mysys/COND_alarm wait/synch/cond/sql/BINLOG::update_cond wait/synch/mutex/mysys/BITMAP_mutex wait/synch/mutex/sql/LOCK_delete ...This ...
https://dev.mysql.com/doc/refman/8.0/en/archive-storage-engine.html
When you create an ARCHIVE table, the storage engine creates files with names that begin with the table name. The ARCHIVE engine also supports the AUTO_INCREMENT table option in CREATE TABLE statements to specify the initial sequence value for a new ... The ARCHIVE storage engine produces special-purpose tables that store large amounts of unindexed data in a very small ...
https://dev.mysql.com/doc/refman/8.0/en/resignal.html
ERROR 1051 (42S02): Unknown table 'xx' Then execution enters the EXIT handler. ERROR 1051 (42S02): Unknown table 'xx' At this point, the contents of the first (current) and second (stacked) diagnostics areas are the same. ERROR 1051 (42S02): Unknown ...RESIGNAL may change some or all information before passing it ...
https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html
In general, you should try to avoid using an ON DUPLICATE KEY UPDATE clause on tables with multiple unique indexes. It is possible to use IGNORE with ON DUPLICATE KEY UPDATE in an INSERT statement, but this may not behave as you expect when ... If ...
https://dev.mysql.com/doc/refman/8.0/en/view-restrictions.html
The maximum number of tables that can be referenced in the definition of a view is 61. View processing is not optimized: It is not possible to create an index on a view. However, a view that is processed with the temptable algorithm is unable to ...
https://dev.mysql.com/doc/refman/8.0/en/index-condition-pushdown-optimization.html
Index Condition Pushdown (ICP) is an optimization for the case where MySQL retrieves rows from a table using an index. Without ICP, the storage engine traverses the index to locate rows in the base table and returns them to the MySQL server which ...With ICP enabled, and if parts of the WHERE condition can be evaluated by using only columns from the index, the MySQL server pushes this part of the WHERE condition down to the storage ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-troubleshoot.html
loose-daemon_memcached_option='-c 64' To troubleshoot problems where the memcached daemon is unable to store or retrieve InnoDB table data, encode the -vvv memcached option in the daemon_memcached_option configuration parameter in the MySQL ... This ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-limitations-limits.html
Memory consumed when data is inserted into an NDB table is not automatically recovered when deleted, as it is with other storage engines. Instead, the following rules hold true: A DELETE statement on an NDB table makes the memory formerly used by ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-temporary-tablespace.html
Session Temporary Tablespaces Session temporary tablespaces store user-created temporary tables and internal temporary tables created by the optimizer when InnoDB is configured as the storage engine for on-disk internal temporary tables. InnoDB ...