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https://dev.mysql.com/doc/refman/5.7/en/create-logfile-group.html
For example, you cannot have a tablespace and a log file group with the same name, or a tablespace and a data file with the same name. You can verify that the UNDO files were created and obtain information about them by querying the Information ...
https://dev.mysql.com/doc/refman/5.7/en/debugging-server.html
This command also provides some useful information even if you have not compiled MySQL for debugging! If the problem is that some tables are getting slower and slower you should try to optimize the table with OPTIMIZE TABLE or myisamchk. If you are ...
https://dev.mysql.com/doc/refman/5.7/en/declare-handler.html
It can take the following forms: mysql_error_code: An integer literal indicating a MySQL error code, such as 1051 to specify “unknown table”: DECLARE CONTINUE HANDLER FOR 1051 BEGIN -- body of handler END; Do not use MySQL error code 0 because ...statement handler_action: { CONTINUE | EXIT | UNDO } condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value | condition_name | SQLWARNING | NOT FOUND | SQLEXCEPTION } The DECLARE ...
https://dev.mysql.com/doc/refman/5.7/en/differences-from-ansi.html
For example, in MySQL, privileges for a table are not automatically revoked when you delete a table. You must explicitly issue a REVOKE statement to revoke privileges for a table. We try to make MySQL Server follow the ANSI SQL standard and the ...
https://dev.mysql.com/doc/refman/5.7/en/distinct-optimization.html
DISTINCT combined with ORDER BY needs a temporary table in many cases. If you do not use columns from all tables named in a query, MySQL stops scanning any unused tables as soon as it finds the first match. Because DISTINCT may use GROUP BY, learn ...
https://dev.mysql.com/doc/refman/5.7/en/drop-server.html
Dropping a server for a table does not affect any FEDERATED tables that used this connection information when they were created. DROP SERVER [ IF EXISTS ] server_name Drops the server definition for the server named server_name. DROP SERVER is not ...
https://dev.mysql.com/doc/refman/5.7/en/drop-trigger.html
DROP TRIGGER requires the TRIGGER privilege for the table associated with the trigger. Triggers for a table are also dropped if you drop the table. DROP TRIGGER [IF EXISTS] [schema_name.]trigger_name This statement drops a trigger. If the schema is ...
https://dev.mysql.com/doc/refman/5.7/en/execution-plan-information.html
Depending on the details of your tables, columns, indexes, and the conditions in your WHERE clause, the MySQL optimizer considers many techniques to efficiently perform the lookups involved in an SQL query. A query on a huge table can be performed ...The set of operations that the optimizer chooses to perform the most efficient query is called the “query execution plan”, also known as the EXPLAIN ...
https://dev.mysql.com/doc/refman/5.7/en/expressions.html
The following table shows the expected form of the expr argument for each unit value. This section lists the grammar rules that expressions must follow in MySQL and provides additional information about the types of terms that may appear in ...
https://dev.mysql.com/doc/refman/5.7/en/federated-storage-engine.html
Querying a local FEDERATED table automatically pulls the data from the remote (federated) tables. The FEDERATED storage engine lets you access data from a remote MySQL database without using replication or cluster technology. To include the ...