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https://dev.mysql.com/doc/refman/5.7/en/innodb-transaction-isolation-levels.html
Transaction isolation is one of the foundations of database processing. Isolation is the I in the acronym ACID; the isolation level is the setting that fine-tunes the balance between performance and reliability, consistency, and reproducibility of ...
https://dev.mysql.com/doc/refman/5.7/en/insert-on-duplicate.html
The VALUES() function is meaningful only as an introducer for INSERT statement value lists, or in the ON DUPLICATE KEY UPDATE clause of an INSERT statement, and returns NULL otherwise. If you specify an ON DUPLICATE KEY UPDATE clause and a row to ...
https://dev.mysql.com/doc/refman/5.7/en/keyring-functions-plugin-specific.html
Return value: Returns 1 for success, or NULL and an error for failure. Return value: Returns 1 for success, or NULL and an error for failure. For each keyring plugin-specific function, this section describes its purpose, calling sequence, and ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-tables.html
The pet table keeps track of which pets you have. If you want to record other information about them, such as events in their lives like visits to the vet or when litters are born, you need another table. What should this table look like? It needs ...
https://dev.mysql.com/doc/refman/5.7/en/myisam-ftdump.html
Example: Suppose that the test database contains a table named mytexttable that has the following definition: CREATE TABLE mytexttable ( id INT NOT NULL, txt TEXT NOT NULL, PRIMARY KEY (id), FULLTEXT (txt) ) ENGINE=MyISAM; The index on id is index 0 ...It reads the MyISAM index file directly, so it must be run on the server host where the table is ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-accounts-table.html
This is NULL for an internal thread, or for a user session that failed to authenticate. This is NULL for an internal thread, or for a user session that failed to authenticate. The accounts table contains a row for each account that has connected to ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-atom-molecule-events.html
For example, a row fetch might result in rows like this: Row# EVENT_NAME TIMER_START TIMER_END ---- ---------- ----------- --------- 1 wait/io/file/myisam/dfile 10001 10002 2 wait/io/table/sql/handler 10000 NULL The row fetch causes a file read. In ... For a table I/O event, there are usually two rows in events_waits_current, not ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-events-stages-current-table.html
END_EVENT_ID This column is set to NULL when the event starts and updated to the thread current event number when the event ends. If an event is produced from an instrument that has TIMED = NO, timing information is not collected, and TIMER_START, ...The table stores one row per thread showing the current status of the thread's most recent monitored stage event, so there is no system variable for configuring the table ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-mutex-instances-table.html
LOCKED_BY_THREAD_ID When a thread currently has a mutex locked, LOCKED_BY_THREAD_ID is the THREAD_ID of the locking thread, otherwise it is NULL. When a thread unlocks a mutex, mutex_instances shows that the mutex now has no owner (the THREAD_ID ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-performance-timers-table.html
The rows that do not contain NULL indicate which timers you can use in setup_timers. For an explanation of how event timing occurs, see Section 25.4.1, “Performance Schema Event Timing”. Note As of MySQL 5.7.21, the Performance Schema ...