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https://dev.mysql.com/doc/refman/5.7/en/performance-schema-table-characteristics.html
The name of the performance_schema database is lowercase, as are the names of tables within it. Many tables in the performance_schema database are read only and cannot be modified: mysql> TRUNCATE TABLE performance_schema.setup_instruments; ERROR ...Generally, the effect is to reset the summary columns to 0 or NULL, not to remove ...
https://dev.mysql.com/doc/refman/5.7/en/show-tables.html
SHOW [FULL] TABLES [{FROM | IN} db_name] [LIKE 'pattern' | WHERE expr] SHOW TABLES lists the non-TEMPORARY tables in a given database. The LIKE clause, if present, indicates which table names to match. Matching performed by the LIKE clause is ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-key.html
In MySQL 5.7, columns using prefixes are permitted when creating, altering, or upgrading partitioned tables, even though they are not included in the table's partitioning key. Important For a key-partitioned table, you cannot execute an ALTER TABLE ...NDB Cluster uses MD5() for this purpose; for tables using other storage engines, the server employs its own internal hashing function which is based on the same algorithm as ... Partitioning by key ...
https://dev.mysql.com/doc/refman/5.7/en/problems-connecting.html
(Alternatively, you could add a row to the user table with a Host value that contains a wildcard (for example, 'pluto.%'). Under Linux or Unix, check your IP tables (or similar) configuration to ensure that the port has not been blocked. The grant ... If you encounter problems when you try to connect to the MySQL server, the following items describe some courses of action you can take to correct the ...
https://dev.mysql.com/doc/refman/5.7/en/sys-table-exists.html
Tests whether a given table exists as a regular table, a TEMPORARY table, or a view. If both a temporary and a permanent table exist with the given name, TEMPORARY is returned. Parameters in_db VARCHAR(64): The name of the database in which to ...
https://dev.mysql.com/doc/refman/5.7/en/charset-table.html
The CREATE TABLE and ALTER TABLE statements have optional clauses for specifying the table character set and collation: CREATE TABLE tbl_name (column_list) [[DEFAULT] CHARACTER SET charset_name] [COLLATE collation_name]] ALTER TABLE tbl_name ...If ...
https://dev.mysql.com/doc/refman/5.7/en/information-schema-innodb-cmpmem-table.html
The INNODB_CMPMEM and INNODB_CMPMEM_RESET tables provide status information on compressed pages within the InnoDB buffer pool. The INNODB_CMPMEM and INNODB_CMPMEM_RESET tables have these columns: PAGE_SIZE The block size in bytes. row ...PAGES_USED ...
https://dev.mysql.com/doc/refman/5.7/en/extensions-to-ansi.html
(Nevertheless, it is preferable to use RENAME TABLE or ALTER TABLE ... Use of CHANGE col_name, DROP col_name, or DROP INDEX, IGNORE or RENAME in ALTER TABLE statements. Use of multiple ADD, ALTER, DROP, or CHANGE clauses in an ALTER TABLE statement.
https://dev.mysql.com/doc/refman/5.7/en/information-schema-table-constraints-table.html
The TABLE_CONSTRAINTS table has these columns: CONSTRAINT_CATALOG The name of the catalog to which the constraint belongs. TABLE_SCHEMA The name of the schema (database) to which the table belongs. CONSTRAINT_SCHEMA The name of the schema (database) ...
https://dev.mysql.com/doc/refman/5.7/en/external-locking.html
External locking is the use of file system locking to manage contention for MyISAM database tables by multiple processes. External locking is used in situations where a single process such as the MySQL server cannot be assumed to be the only ...