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https://dev.mysql.com/doc/refman/5.7/en/explain.html
In practice, the DESCRIBE keyword is more often used to obtain information about table structure, whereas EXPLAIN is used to obtain a query execution plan (that is, an explanation of how MySQL would execute a query). By default, DESCRIBE displays ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking-reads.html
(Old versions of a record cannot be locked; they are reconstructed by applying undo logs on an in-memory copy of the record.) These clauses are primarily useful when dealing with tree-structured or graph-structured data, either in a single table or ... If you query data and then insert or update related data within the same transaction, the regular SELECT statement does not give enough ...
https://dev.mysql.com/doc/refman/5.7/en/load-index.html
| ALL } The LOAD INDEX INTO CACHE statement preloads a table index into the key cache to which it has been assigned by an explicit CACHE INDEX statement, or into the default key cache otherwise. LOAD INDEX INTO CACHE applies only to MyISAM tables, ...tbl_index_list: tbl_name [PARTITION (partition_list)] [{INDEX|KEY} (index_name[, index_name] ...)] [IGNORE LEAVES] partition_list: { partition_name[, partition_name] ...
https://dev.mysql.com/doc/refman/5.7/en/multiple-key-caches.html
This feature enables you to assign different table indexes to different key caches. Where there are multiple key caches, the server must know which cache to use when processing queries for a given MyISAM table. By default, all MyISAM table indexes ... Shared access to the key cache improves performance but does not eliminate contention among sessions ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-sql-statements.html
However, you can use LIKE to filter queries against the Information Schema ENGINES table, as discussed in the next item. SELECT * FROM INFORMATION_SCHEMA.ENGINES [WHERE ENGINE LIKE 'NDB%'] This is the equivalent of SHOW ENGINES, but uses the ENGINES ... This section discusses several SQL statements that can prove useful in managing and monitoring a MySQL server that is connected to an NDB Cluster, and in some cases provide information about the cluster ...
https://dev.mysql.com/doc/refman/5.7/en/optimize-overview.html
Database performance depends on several factors at the database level, such as tables, queries, and configuration settings. In practice, the advanced InnoDB performance features mean that InnoDB tables often outperform the simpler MyISAM tables, ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning.html
Note As of MySQL 5.7.17, the generic partitioning handler in the MySQL server is deprecated, and is removed in MySQL 8.0, when the storage engine used for a given table is expected to provide its own (“native”) partitioning handler. Use of ...
https://dev.mysql.com/doc/refman/5.7/en/performance-schema-pre-filtering.html
Pre-filtering can be applied to either the producer or consumer stage of event processing: To configure pre-filtering at the producer stage, several tables can be used: setup_instruments indicates which instruments are available. An instrument ...
https://dev.mysql.com/doc/refman/5.7/en/cache-index.html
| ALL } The CACHE INDEX statement assigns table indexes to a specific key cache. However, the implementation assigns all the table's indexes to the cache, so there is no reason to specify anything other than the table name. A key cache must exist ...
https://dev.mysql.com/doc/refman/5.7/en/forcing-innodb-recovery.html
To investigate database page corruption, you might dump your tables from the database with SELECT ... In such cases, you can use the innodb_force_recovery option to force the InnoDB storage engine to start up while preventing background operations ...Usually, most of the data obtained in this way is ...