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https://dev.mysql.com/doc/refman/5.7/en/mysql-indexes.html
Without an index, MySQL must begin with the first row and then read through the entire table to find the relevant rows. If the table has an index for the columns in question, MySQL can quickly determine the position to seek to in the middle of the ... Indexes are used to find rows with specific column values ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-flush.html
Some forms of the FLUSH statement are not logged because they could cause problems if replicated to a replica: FLUSH LOGS and FLUSH TABLES WITH READ LOCK. The FLUSH TABLES, ANALYZE TABLE, OPTIMIZE TABLE, and REPAIR TABLE statements are written to ...These statements are written to the binary log unless you specify NO_WRITE_TO_BINLOG or its alias ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema.html
INFORMATION_SCHEMA provides access to database metadata, information about the MySQL server such as the name of a database or table, the data type of a column, or access privileges. Other terms that are sometimes used for this information are data ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-disk-data.html
It is possible to store the nonindexed columns of NDB tables on disk, rather than in RAM. As part of implementing NDB Cluster Disk Data work, a number of improvements were made in NDB Cluster for the efficient handling of very large amounts ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-innodb.html
This section explains how to optimize database operations for InnoDB tables. InnoDB is the storage engine that MySQL customers typically use in production databases where reliability and concurrency are important.
https://dev.mysql.com/doc/refman/5.7/en/optimizing-myisam.html
The MyISAM storage engine performs best with read-mostly data or with low-concurrency operations, because table locks limit the ability to perform simultaneous updates. In MySQL, InnoDB is the default storage engine rather than MyISAM.
https://dev.mysql.com/doc/refman/5.7/en/show-warnings.html
Warnings are generated for DML statements such as INSERT, UPDATE, and LOAD DATA as well as DDL statements such as CREATE TABLE and ALTER TABLE. The ALTER TABLE statement produces three warning messages (strict SQL mode is disabled for the example to ...mysql> CREATE TABLE t1 (a TINYINT NOT NULL, b CHAR(4)); Query OK, 0 rows affected (0.05 sec) mysql> INSERT INTO t1 VALUES(10,'mysql'), (NULL,'test'), (300,'xyz'); Query OK, 3 rows affected, 3 warnings (0.00 sec) Records: 3 Duplicates: 0 Warnings: 3 mysql> SHOW WARNINGS\G ...
https://dev.mysql.com/doc/refman/5.7/en/slow-query-log.html
Administrative statements include ALTER TABLE, ANALYZE TABLE, CHECK TABLE, CREATE INDEX, DROP INDEX, OPTIMIZE TABLE, and REPAIR TABLE. Note If you specify the TABLE log destination, see Log Tables and “Too many open files” Errors. (Even with ...
https://dev.mysql.com/doc/refman/5.7/en/user-names.html
You should never alter the structure of tables in the mysql database in any manner whatsoever except by means of the procedure that is described in Section 2.10, “Upgrading MySQL”. MySQL stores accounts in the user table of the mysql system ...
https://dev.mysql.com/doc/refman/5.7/en/all-subqueries.html
The expression is TRUE if table t2 contains (-5,0,+5) because 10 is greater than all three values in t2. The expression is FALSE if table t2 contains (12,6,NULL,-100) because there is a single value 12 in table t2 that is greater than 10. The ...