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https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb-queries.html
To tune queries for InnoDB tables, create an appropriate set of indexes on each table. Do not create a separate secondary index for each column, because each query can only make use of one index. If you have many queries for the same table, testing ...Follow these guidelines for InnoDB indexes: Because each InnoDB table has a primary key (whether you request one or not), specify a set of primary key columns for each table, columns that are used in the most important and time-critical ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-stage-tables.html
The Performance Schema instruments stages, which are steps during the statement-execution process, such as parsing a statement, opening a table, or performing a filesort operation. Stages correspond to the thread states displayed by SHOW ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-triggers.html
If the new server is a replication source server and has old replicas that do not support multiple triggers, an error occurs on those replicas if a trigger is created on the source for a table that already has a trigger with the same trigger event ... With statement-based replication, triggers executed on the source also execute on the ...
https://dev.mysql.com/doc/refman/5.7/en/replication-gtids-failover.html
There are several variants of this method, the difference being in the manner in which data dumps and transactions from binary logs are transfered to the replica, as outlined here: Data Set Create a dump file using mysqldump on the source server.
https://dev.mysql.com/doc/refman/5.7/en/replication-rules-examples.html
If you use a combination of database-level and table-level replication filtering options, the replica first accepts or ignores events using the database options, then it evaluates all events permitted by those options according to the table options. It is also important to note that the results vary depending on whether the operation is logged using statement-based or row-based binary logging ...
https://dev.mysql.com/doc/refman/5.7/en/scalar-subqueries.html
In its simplest form, a subquery is a scalar subquery that returns a single value. A scalar subquery is a simple operand, and you can use it almost anywhere a single column value or literal is legal, and you can expect it to have those ...
https://dev.mysql.com/doc/refman/5.7/en/show-procedure-status.html
row *************************** Db: test Name: sp1 Type: PROCEDURE Definer: testuser@localhost Modified: 2018-08-08 13:54:11 Created: 2018-08-08 13:54:11 Security_type: DEFINER Comment: character_set_client: utf8 collation_connection: ...It returns ... SHOW PROCEDURE STATUS [LIKE 'pattern' | WHERE expr] This statement is a MySQL ...
https://dev.mysql.com/doc/refman/5.7/en/temporary-table-problems.html
Temporary tables created with CREATE TEMPORARY TABLE have the following limitations: TEMPORARY tables are supported only by the InnoDB, MEMORY, MyISAM, and MERGE storage engines. It may occur for temporary tables created outside stored functions ...
https://dev.mysql.com/doc/refman/5.7/en/truncate-table.html
Logically, TRUNCATE TABLE is similar to a DELETE statement that deletes all rows, or a sequence of DROP TABLE and CREATE TABLE statements. It differs from DELETE in the following ways: Truncate operations drop and re-create the table, which is much ...To achieve high performance, it bypasses the DML method of deleting ...
https://dev.mysql.com/doc/refman/5.7/en/view-check-option.html
The WITH CHECK OPTION clause can be given for an updatable view to prevent inserts to rows for which the WHERE clause in the select_statement is not true. It also prevents updates to rows for which the WHERE clause is true but the update would ...