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https://dev.mysql.com/doc/refman/8.0/en/hash-joins.html
row *************************** id: 1 select_type: SIMPLE table: t1 partitions: NULL type: ALL possible_keys: NULL key: NULL key_len: NULL ref: NULL rows: 1 filtered: 100.00 Extra: NULL *************************** 2. Prior to MySQL 8.0.20, a hash ...
https://dev.mysql.com/doc/refman/8.0/en/trigger-syntax.html
To create a trigger or drop a trigger, use the CREATE TRIGGER or DROP TRIGGER statement, described in Section 15.1.22, “CREATE TRIGGER Statement”, and Section 15.1.34, “DROP TRIGGER Statement”. Here is a simple example that associates a ...
https://dev.mysql.com/doc/refman/8.0/en/external-locking.html
External locking is the use of file system locking to manage contention for MyISAM database tables by multiple processes. External locking is used in situations where a single process such as the MySQL server cannot be assumed to be the only ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-upgrade-downgrade.html
In many cases, mysqld cannot open tables that were created or modified by a later version of MySQL. Do not use ALTER TABLE on any existing NDB tables; do not create any new NDB tables which cannot be safely dropped prior to downgrading. After ...In ... Versions Supported for Upgrade to NDB 8.0 Reverting an NDB Cluster 8.0 Upgrade Known Issues When Upgrading or Downgrading NDB Cluster This section provides information about NDB Cluster software and compatibility between different NDB Cluster 8.0 releases with regard to performing upgrades and ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-cached-indexes-table.html
The INNODB_CACHED_INDEXES table reports the number of index pages cached in the InnoDB buffer pool for each index. For related usage information and examples, see Section 17.15.5, “InnoDB INFORMATION_SCHEMA Buffer Pool Tables”. row ...Index ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-stages-history-long-table.html
The events_stages_history_long table contains the N most recent stage events that have ended globally, across all threads. Stage events are not added to the table until they have ended. When the table becomes full, the oldest row is discarded when ...The Performance Schema autosizes the value of N during server ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-statements-history-long-table.html
The events_statements_history_long table contains the N most recent statement events that have ended globally, across all threads. Statement events are not added to the table until they have ended. When the table becomes full, the oldest row is ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-transactions-history-long-table.html
The events_transactions_history_long table contains the N most recent transaction events that have ended globally, across all threads. Transaction events are not added to the table until they have ended. When the table becomes full, the oldest row ...The Performance Schema autosizes the value of N is autosized at server ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-waits-history-long-table.html
The events_waits_history_long table contains N the most recent wait events that have ended globally, across all threads. Wait events are not added to the table until they have ended. When the table becomes full, the oldest row is discarded when a ...The Performance Schema autosizes the value of N during server ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-ndb-cluster-tables.html
The following table shows all Performance Schema tables relating to the NDBCLUSTER storage engine. Table 29.3 Performance Schema NDB Tables Table Name Description ndb_sync_excluded_objects NDB objects which cannot be synchronized ...This is done by ...