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https://dev.mysql.com/doc/refman/8.0/en/information-schema-check-constraints-table.html
As of MySQL 8.0.16, CREATE TABLE permits the core features of table and column CHECK constraints, and the CHECK_CONSTRAINTS table provides information about these constraints. The CHECK_CONSTRAINTS table has these columns: CONSTRAINT_CATALOG The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-keywords-table.html
The KEYWORDS table lists the words considered keywords by MySQL and, for each one, indicates whether it is reserved. This table provides applications a runtime source of MySQL keyword information. Prior to MySQL 8.0.13, selecting from the KEYWORDS ...Reserved keywords may require special treatment in some contexts, such as special quoting when used as identifiers (see Section 11.3, “Keywords and Reserved ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-schema-privileges-table.html
The SCHEMA_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. TABLE_CATALOG The name of the catalog to which the schema belongs. IS_GRANTABLE YES if the user has ...The value can be any privilege that can be granted at the schema level; see Section 15.7.1.6, “GRANT ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-tablespaces-table.html
Other INFORMATION_SCHEMA tables may provide related information: For NDB, the INFORMATION_SCHEMA FILES table provides tablespace-related information. For InnoDB, the INFORMATION_SCHEMA INNODB_TABLESPACES and INNODB_DATAFILES tables provide ...It is ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-user-privileges-table.html
The USER_PRIVILEGES table has these columns: GRANTEE The name of the account to which the privilege is granted, in 'user_name'@'host_name' format. IS_GRANTABLE YES if the user has the GRANT OPTION privilege, NO otherwise. The value can be any ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-information-schema-tables.html
For related information and examples, see Section 17.15, “InnoDB INFORMATION_SCHEMA Tables”. INFORMATION_SCHEMA InnoDB tables can be used to monitor ongoing InnoDB activity, to detect inefficiencies before they turn into issues, or to ...As your ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-firewall-tables.html
Note The Performance Schema tables described here are available as of MySQL 8.0.23. Prior to MySQL 8.0.23, use the corresponding INFORMATION_SCHEMA tables instead; see MySQL Enterprise Firewall Tables. The following sections describe the ...They ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-tables.html
The setup tables provide information about the current instrumentation and enable the monitoring configuration to be changed. For this reason, some columns in these tables can be changed if you have the UPDATE privilege. The use of tables rather ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-memcached-txn.html
Allowing or Disallowing DDL By default, you can perform DDL operations such as ALTER TABLE on tables used by the daemon_memcached plugin. Although the default behavior does not offer the best possible raw performance, it is still fast compared to ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-optimization.html
Applications that monitor databases may make frequent use of Performance Schema tables. To write queries for these tables most efficiently, take advantage of their indexes. Tables that do not are those that normally contain few rows or are unlikely ...For example, include a WHERE clause that restricts retrieved rows based on comparison to specific values in an indexed ...