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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-transactions-history-table.html
The events_transactions_history table contains the N most recent transaction events that have ended per thread. Transaction events are not added to the table until they have ended. When the table contains the maximum number of rows for a given ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-events-waits-history-table.html
The events_waits_history table contains the N most recent wait events that have ended per thread. Wait events are not added to the table until they have ended. When the table contains the maximum number of rows for a given thread, the oldest thread ...The Performance Schema autosizes the value of N during server ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-objects-summary-global-by-type-table.html
The Performance Schema maintains the objects_summary_global_by_type table for aggregating object wait events. row *************************** OBJECT_TYPE: TABLE OBJECT_SCHEMA: test OBJECT_NAME: t COUNT_STAR: 3 SUM_TIMER_WAIT: 263126976 ...Example ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-replication-applier-status-table.html
This table shows the current general transaction execution status on the replica. The table provides information about general aspects of transaction applier status that are not specific to any thread involved. Thread-specific status information is ...There is always a default replication channel, and more replication channels can be ...
https://dev.mysql.com/doc/refman/8.0/en/type-conversion.html
mysql> SELECT 38.8, CAST(38.8 AS CHAR); -> 38.8, '38.8' mysql> SELECT 38.8, CONCAT(38.8); -> 38.8, '38.8' See later in this section for information about the character set of implicit number-to-string conversions, and for modified rules that apply ...A single-row subquery from a table or tables is not considered a ... When an operator is used with operands of ...
https://dev.mysql.com/doc/refman/8.0/en/data-masking-component-usage.html
Creating Views that Display Masked Data If masked data from a table is used for multiple queries, it may be convenient to define a view that produces masked data. To use a dictionary, it must first be added to the masking_dictionaries system table ... Before using MySQL Enterprise Data Masking and De-Identification, install it according to the instructions provided at Section 8.5.2.1, “MySQL Enterprise Data Masking and De-Identification Component ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-file-space.html
In a newly created system tablespace, InnoDB allocates space starting from the first data file. To avoid the issues that come with storing all tables and indexes inside the system tablespace, you can enable the innodb_file_per_table configuration ...
https://dev.mysql.com/doc/refman/8.0/en/dynamic-format.html
Dynamic storage format is used if a MyISAM table contains any variable-length columns (VARCHAR, VARBINARY, BLOB, or TEXT), or if the table was created with the ROW_FORMAT=DYNAMIC table option. You can use OPTIMIZE TABLE or myisamchk -r to ...
https://dev.mysql.com/doc/refman/8.0/en/all-subqueries.html
The expression is TRUE if table t2 contains (-5,0,+5) because 10 is greater than all three values in t2. The expression is FALSE if table t2 contains (12,6,NULL,-100) because there is a single value 12 in table t2 that is greater than 10. The ...
https://dev.mysql.com/doc/refman/8.0/en/processlist-access.html
Note As of MySQL 8.0.22, an alternative implementation for SHOW PROCESSLIST is available based on the Performance Schema processlist table, which, like the threads table, does not require a mutex and has better performance characteristics. The ...