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https://dev.mysql.com/doc/refman/5.7/en/charset-we-sets.html
Western European character sets cover most West European languages, such as French, Spanish, Catalan, Basque, Portuguese, Italian, Albanian, Dutch, German, Danish, Swedish, Norwegian, Finnish, Faroese, Icelandic, Irish, Scottish, and English. ascii ...
https://dev.mysql.com/doc/refman/5.7/en/compiler-characteristics.html
In some cases, the compiler used to build MySQL affects the features available for use. The notes in this section apply for binary distributions provided by Oracle Corporation or that you compile yourself from source. icc (Intel C++ Compiler) ...
https://dev.mysql.com/doc/refman/5.7/en/conditions-and-parameters.html
If a stored procedure exits with an unhandled exception, modified values of OUT and INOUT parameters are not propogated back to the caller. If an exception is handled by a CONTINUE or EXIT handler that contains a RESIGNAL statement, execution of ...
https://dev.mysql.com/doc/refman/5.7/en/correlated-subqueries.html
A correlated subquery is a subquery that contains a reference to a table that also appears in the outer query. For example: SELECT * FROM t1 WHERE column1 = ANY (SELECT column1 FROM t2 WHERE t2.column2 = t1.column2); Notice that the subquery ...
https://dev.mysql.com/doc/refman/5.7/en/creating-many-tables.html
If you have many MyISAM tables in the same database directory, open, close, and create operations are slow. If you execute SELECT statements on many different tables, there is a little overhead when the table cache is full, because for every table ...
https://dev.mysql.com/doc/refman/5.7/en/creating-tables.html
You want a table that contains a record for each of your pets. This can be called the pet table, and it should contain, as a bare minimum, each animal's name. Because the name by itself is not very interesting, the table should contain other ...
https://dev.mysql.com/doc/refman/5.7/en/ddl-log.html
The DDL log, or metadata log, records metadata operations generated by data definition statements affecting table partitioning, such as ALTER TABLE t3 DROP PARTITION p2, where we must make certain that the partition is completely dropped and that ...
https://dev.mysql.com/doc/refman/5.7/en/debugging-server.html
If you are using some functionality that is very new in MySQL, you can try to run mysqld with the --skip-new option (which disables all new, potentially unsafe functionality). If mysqld does not want to start, verify that you have no my.cnf files ...
https://dev.mysql.com/doc/refman/5.7/en/declare-condition.html
DECLARE condition_name CONDITION FOR condition_value condition_value: { mysql_error_code | SQLSTATE [VALUE] sqlstate_value } The DECLARE ... CONDITION statement declares a named error condition, associating a name with a condition that needs ...
https://dev.mysql.com/doc/refman/5.7/en/delete-optimization.html
The time required to delete individual rows in a MyISAM table is exactly proportional to the number of indexes. To delete rows more quickly, you can increase the size of the key cache by increasing the key_buffer_size system variable. To delete all ...