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https://dev.mysql.com/doc/refman/5.7/en/derived-table-optimization.html
The optimizer handles derived tables and view references the same way: It avoids unnecessary materialization whenever possible, which enables pushing down conditions from the outer query to derived tables and produces more efficient execution plans.
https://dev.mysql.com/doc/refman/5.7/en/downgrading.html
Note In the following discussion, MySQL commands that must be run using a MySQL account with administrative privileges include -u root on the command line to specify the MySQL root user. This section describes the steps to downgrade a MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/enterprise-encryption-usage.html
To use MySQL Enterprise Encryption in applications, invoke the functions that are appropriate for the operations you wish to perform. Use the private key to encrypt data and the public key to decrypt it This requires that the members of the key ...
https://dev.mysql.com/doc/refman/5.7/en/enum.html
For example, this CREATE TABLE statement does not work because the CONCAT function cannot be used to construct an enumeration value: CREATE TABLE sizes ( size ENUM('small', CONCAT('med','ium'), 'large') ); You also cannot employ a user variable as ... An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation ...
https://dev.mysql.com/doc/refman/5.7/en/error-interfaces.html
The client may display the error message so the user can take corrective measures, internally attempt to resolve or retry a failed operation, or take other action. Error messages can originate on the server side or the client side, and each error ...
https://dev.mysql.com/doc/refman/5.7/en/error-message-elements.html
As just illustrated, the client may display the error message so the user can take corrective measures. This section discusses how error messages originate within MySQL and the elements they contain. Error Message Sources Error Message Elements ...
https://dev.mysql.com/doc/refman/5.7/en/events-syntax.html
An event can be dropped by any user having the EVENT privilege for the database on which the event is defined. MySQL provides several SQL statements for working with scheduled events: New events are defined using the CREATE EVENT statement. The ...
https://dev.mysql.com/doc/refman/5.7/en/explain-output.html
For InnoDB tables that have a user-defined clustered index, that index can be used even when Using index is absent from the Extra column. The EXPLAIN statement provides information about how MySQL executes statements. EXPLAIN returns a row of ...
https://dev.mysql.com/doc/refman/5.7/en/features.html
We also know of users who use MySQL Server with 200,000 tables and about 5,000,000,000 rows. This section describes some of the important characteristics of the MySQL Database Software. In most respects, the roadmap applies to all versions of MySQL. Tested with Purify (a commercial memory leakage detector) as well as with Valgrind, a GPL tool ...
https://dev.mysql.com/doc/refman/5.7/en/full-disk.html
This section describes how MySQL responds to disk-full errors (such as “no space left on device”), and to quota-exceeded errors (such as “write failed” or “user block limit reached”). If there is enough space, it continues as if nothing ...