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https://dev.mysql.com/doc/refman/5.7/en/not-enough-file-handles.html
If you get ERROR 'file_name' not found (errno: 23), Can't open file: file_name (errno: 24), or any other error with errno 23 or errno 24 from MySQL, it means that you have not allocated enough file descriptors for the MySQL server. To tell mysqld ...You can either tell mysqld not to open so many files at once or increase the number of file descriptors available to ...
https://dev.mysql.com/doc/refman/5.7/en/show-events.html
row *************************** Db: myschema Name: e_daily Definer: jon@ghidora Time zone: SYSTEM Type: RECURRING Execute at: NULL Interval value: 1 Interval field: DAY Starts: 2018-08-08 11:06:34 Ends: NULL Status: ENABLED Originator: 1 ...Type The ... SHOW EVENTS [{FROM | IN} schema_name] [LIKE 'pattern' | WHERE expr] This statement displays information about Event Manager events, which are discussed in Section 23.4, “Using the Event ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-table-import.html
If the table has a foreign key relationship, foreign_key_checks must be disabled before executing DISCARD TABLESPACE. Also, you should export all foreign key related tables at the same logical point in time, as ALTER TABLE ... A schema mismatch ...
https://dev.mysql.com/doc/refman/5.7/en/cost-model.html
To generate execution plans, the optimizer uses a cost model that is based on estimates of the cost of various operations that occur during query execution. The optimizer has a set of compiled-in default “cost constants” available to it to make ...Any non-NULL cost estimate specified in the tables takes precedence over the corresponding compiled-in default cost ...
https://dev.mysql.com/doc/refman/5.7/en/group-by-optimization.html
There are two ways to execute a GROUP BY query through index access, as detailed in the following sections. The second method first performs a range scan, and then groups the resulting tuples. The most general way to satisfy a GROUP BY clause is to ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-delete-all.html
--connect-retries Command-Line Format --connect-retries=# Type Integer Default Value 12 Minimum Value 0 Maximum Value 12 Number of times to retry connection before giving up. --connect-retry-delay Command-Line Format --connect-retry-delay=# Type ...
https://dev.mysql.com/doc/refman/5.7/en/using-encrypted-connections.html
(The files need not have been generated automatically; what matters is that they have those names and are valid.) If the server does not find valid certificate and key files in the data directory, it continues executing but without support for ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-programs-ndb-move-data.html
--connect-retry-delay Command-Line Format --connect-retry-delay=# Type Integer Default Value 5 Minimum Value 0 Maximum Value 5 Number of seconds to wait between attempts to contact management server. --connect-retries Command-Line Format ...Usage ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking.html
If a lock request conflicts with an existing lock and cannot be granted because it would cause deadlock, an error occurs. It allows you to choose how to trade off between predictable sequences of auto-increment values and maximum concurrency for ...
https://dev.mysql.com/doc/refman/5.7/en/function-resolution.html
ADDDATE BIT_AND BIT_OR BIT_XOR CAST COUNT CURDATE CURTIME DATE_ADD DATE_SUB EXTRACT GROUP_CONCAT MAX MID MIN NOW POSITION SESSION_USER STD STDDEV STDDEV_POP STDDEV_SAMP SUBDATE SUBSTR SUBSTRING SUM SYSDATE SYSTEM_USER TRIM VARIANCE VAR_POP VAR_SAMP ... MySQL supports built-in (native) functions, loadable functions, and stored ...