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https://dev.mysql.com/doc/refman/8.0/en/declare-cursor.html
For information available through SHOW statements, it is possible in many cases to obtain equivalent information by using a cursor with an INFORMATION_SCHEMA table. DECLARE cursor_name CURSOR FOR select_statement This statement declares a cursor ...
https://dev.mysql.com/doc/refman/8.0/en/describe.html
The DESCRIBE and EXPLAIN statements are synonyms, used either to obtain information about table structure or query execution plans. For more information, see Section 15.7.7.5, “SHOW COLUMNS Statement”, and Section 15.8.2, “EXPLAIN ...
https://dev.mysql.com/doc/refman/8.0/en/do.html
For example, DO id FROM t1 is invalid because it references a table. In most respects, DO is shorthand for SELECT expr, ..., but has the advantage that it is slightly faster when you do not care about the result. DO is useful primarily with ...
https://dev.mysql.com/doc/refman/8.0/en/drop-logfile-group.html
(For information on creating log file groups, see Section 15.1.16, “CREATE LOGFILE GROUP Statement”.) Important Before dropping a log file group, you must drop all tablespaces that use that log file group for UNDO logging. DROP LOGFILE GROUP ...
https://dev.mysql.com/doc/refman/8.0/en/drop-spatial-reference-system.html
If the SRID value is used by some column in an existing table, an error occurs. DROP SPATIAL REFERENCE SYSTEM [IF EXISTS] srid srid: 32-bit unsigned integer This statement removes a spatial reference system (SRS) definition from the data dictionary. Example: DROP SPATIAL REFERENCE SYSTEM 4120; If no SRS definition with the SRID value exists, an error occurs unless IF EXISTS is ...
https://dev.mysql.com/doc/refman/8.0/en/drop-user.html
It removes privilege rows for the account from all grant tables. The DROP USER statement removes one or more MySQL accounts and their privileges. Roles named in the mandatory_roles system variable value cannot be dropped. To use DROP USER, you must ...
https://dev.mysql.com/doc/refman/8.0/en/enterprise-encryption-usage.html
Key string values can be created at runtime and stored into a variable or table using SET, SELECT, or INSERT. To use MySQL Enterprise Encryption in applications, invoke the functions that are appropriate for the operations you wish to perform. In ...
https://dev.mysql.com/doc/refman/8.0/en/error-creating-innodb.html
Initialization Problems If something goes wrong when InnoDB attempts to initialize its tablespace or its log files, delete all files created by InnoDB: all ibdata files and all redo log files (#ib_redoN files in MySQL 8.0.30 and higher or ib_logfile ... The troubleshooting steps for InnoDB I/O problems depend on when the problem occurs: during startup of the MySQL server, or during normal operations when a DML or DDL statement fails due to problems at the file system ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-event-fields.html
Error events intended for the error log contain a set of fields, each of which consists of a key/value pair. An event field may be classified as core, optional, or user-defined: A core field is set up automatically for error events. However, its ...
https://dev.mysql.com/doc/refman/8.0/en/error-log-priority-based-filtering.html
The log_error_verbosity system variable controls verbosity based on which priorities to permit for messages written to the log, as shown in the following table. The log_filter_internal log filter component implements a simple form of log filtering ...