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https://dev.mysql.com/doc/refman/5.7/en/date-and-time-type-conversion.html
To some extent, you can convert a value from one temporal type to another. However, there may be some alteration of the value or loss of information. In all cases, conversion between temporal types is subject to the range of valid values for the ...
https://dev.mysql.com/doc/refman/5.7/en/dba-dtrace-server.html
Support for DTrace is deprecated in MySQL 5.7 and is removed in MySQL 8.0. The DTrace probes in the MySQL server are designed to provide information about the execution of queries within MySQL and the different areas of the system being utilized ...
https://dev.mysql.com/doc/refman/5.7/en/declare-cursor.html
DECLARE cursor_name CURSOR FOR select_statement This statement declares a cursor and associates it with a SELECT statement that retrieves the rows to be traversed by the cursor. The number of columns retrieved by the SELECT statement must match the ...
https://dev.mysql.com/doc/refman/5.7/en/deleting-from-related-tables.html
If the total length of the DELETE statement for related_table is more than 1MB (the default value of the max_allowed_packet system variable), you should split it into smaller parts and execute multiple DELETE statements. You probably get the ...
https://dev.mysql.com/doc/refman/5.7/en/disk-issues.html
This section describes ways to configure storage devices when you can devote more and faster storage hardware to the database server. For information about optimizing an InnoDB configuration to improve I/O performance, see Section 8.5.8, ...
https://dev.mysql.com/doc/refman/5.7/en/downgrade-troubleshooting.html
If you downgrade from one release series to another, there may be incompatibilities in table storage formats. In this case, use mysqldump to dump your tables before downgrading. After downgrading, reload the dump file using mysql or mysqlimport to ...
https://dev.mysql.com/doc/refman/5.7/en/engine-condition-pushdown-optimization.html
This optimization improves the efficiency of direct comparisons between a nonindexed column and a constant. In such cases, the condition is “pushed down” to the storage engine for evaluation. This optimization can be used only by the NDB ...
https://dev.mysql.com/doc/refman/5.7/en/entering-queries.html
Make sure that you are connected to the server, as discussed in the previous section. Doing so does not in itself select any database to work with, but that is okay. At this point, it is more important to find out a little about how to issue ...
https://dev.mysql.com/doc/refman/5.7/en/error-message-elements.html
This section discusses how error messages originate within MySQL and the elements they contain. Error Message Sources Error Message Elements Error Message Sources Error messages can originate on the server side or the client side: On the server ...
https://dev.mysql.com/doc/refman/5.7/en/event-scheduler.html
The MySQL Event Scheduler manages the scheduling and execution of events, that is, tasks that run according to a schedule. The following discussion covers the Event Scheduler and is divided into the following sections: Section 23.4.1, “Event ...