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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-reference.html
The following table summarizes all available Performance Schema tables. For greater detail, see the individual table descriptions. Table 25.1 Performance Schema Tables Table Name Description Deprecated accounts Connection statistics per client ...
https://dev.mysql.com/doc/refman/5.7/en/repair-table-optimization.html
An alternative that avoids this problem is to use a separate key cache, assign to it the indexes from the table to be repaired, and deallocate it when the repair is complete. REPAIR TABLE for MyISAM tables is similar to using myisamchk for repair ...You may be able to its improve performance by setting these variables, as described in Section 4.6.3.6, “myisamchk Memory ...
https://dev.mysql.com/doc/refman/5.7/en/storage-engine-setting.html
To convert a table from one storage engine to another, use an ALTER TABLE statement that indicates the new engine: ALTER TABLE t ENGINE = InnoDB; See Section 13.1.18, “CREATE TABLE Statement”, and Section 13.1.8, “ALTER TABLE Statement”. By ... When you create a new table, you can specify which storage engine to use by adding an ENGINE table option to the CREATE TABLE statement: -- ENGINE=INNODB not needed unless you have set a different -- default storage ...
https://dev.mysql.com/doc/refman/5.7/en/faqs-cjk.html
Does MySQL permit CJK characters to be used in database and table names? A.11.18. You can obtain this information for a column column_name in the table table_name using the following query: SELECT HEX(column_name) FROM table_name; 3F is the encoding ... This set of Frequently Asked Questions derives from the experience of MySQL's Support and Development groups in handling many inquiries about CJK (Chinese-Japanese-Korean) ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-locking.html
Intention Locks InnoDB supports multiple granularity locking which permits coexistence of row locks and table locks. WRITE takes an exclusive lock (an X lock) on the specified table. Intention locks are table-level locks that indicate which type of ...Shared and Exclusive Locks Intention Locks Record Locks Gap Locks Next-Key Locks Insert Intention Locks AUTO-INC Locks Predicate Locks for Spatial Indexes Shared and Exclusive Locks InnoDB implements standard row-level locking where there are two types of locks, shared (S) locks and exclusive (X) ...
https://dev.mysql.com/doc/refman/5.7/en/replication-features-transactions.html
In general, you should avoid transactions that update both transactional and nontransactional tables in a replication environment. You should also avoid using any statement that accesses both transactional (or temporary) and nontransactional tables ...The server uses these rules for binary logging: If the initial statements in a transaction are nontransactional, they are written to the binary log ...
https://dev.mysql.com/doc/refman/5.7/en/rewriter-query-rewrite-plugin-reference.html
Users communicate with the plugin by modifying the set of rules stored in this table. The plugin communicates information to users by setting the table's message column. Note The rules table is loaded into the plugin by the flush_rewrite_rules ...
https://dev.mysql.com/doc/refman/5.7/en/federated-create.html
Alternatively, make a note of the table definition of an existing table, perhaps using the SHOW CREATE TABLE statement. To create a FEDERATED table you should follow these steps: Create the table on the remote server. Create the table on the local ...The optimization occurs because the query sent to the remote server includes the contents of the WHERE clause, and is sent to the remote server and subsequently executed ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-statistics-estimation.html
Optimizer statistics are not persisted to disk when innodb_stats_persistent=OFF or when individual tables are created or altered with STATS_PERSISTENT=0. Optimizer Statistics Updates Non-persistent optimizer statistics are updated when: Running ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-columns-table.html
The COLUMNS table has these columns: TABLE_CATALOG The name of the catalog to which the table containing the column belongs. TABLE_SCHEMA The name of the schema (database) to which the table containing the column belongs. Unlike SHOW COLUMNS, SELECT ...ORDINAL_POSITION is necessary because you might want to say ORDER BY ...