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https://dev.mysql.com/doc/refman/8.0/en/firewall-reference.html
For information about MySQL Enterprise Firewall Information Schema and Performance Schema tables, see Section 28.7, “INFORMATION_SCHEMA MySQL Enterprise Firewall Tables”, and Section 29.12.17, “Performance Schema Firewall Tables”, ...When ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-triggers-table.html
To see information about a table's triggers, you must have the TRIGGER privilege for the table. The TRIGGERS table has these columns: TRIGGER_CATALOG The name of the catalog to which the trigger belongs. This is the type of operation on the ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-cmp-table.html
The INNODB_CMP and INNODB_CMP_RESET tables provide status information on operations related to compressed InnoDB tables. The INNODB_CMP and INNODB_CMP_RESET tables have these columns: PAGE_SIZE The compressed page size in bytes. Pages are ...
https://dev.mysql.com/doc/refman/8.0/en/added-deprecated-removed.html
innodb_tmpdir: Directory location for temporary table files created during online ALTER TABLE operations. print_identified_with_as_hex: For SHOW CREATE USER, print hash values containing unprintable characters in hex. Replica_open_temp_tables: ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-what-is-upgraded.html
If the actual data dictionary version is lower than the current expected version, the server creates data dictionary tables with updated definitions, copies persisted metadata to the new tables, atomically replaces the old tables with the new ones, ... Installing a new version of MySQL may require upgrading these parts of the existing installation: The mysql system schema, which contains tables that store information required by the MySQL server as it runs (see Section 7.3, “The mysql System ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-threads-table.html
For background threads, setting the ENABLED value controls whether INSTRUMENTED is set to YES or NO for threads that are subsequently created for this instrument and listed in the threads table. For background threads, setting the HISTORY value ...
https://dev.mysql.com/doc/refman/8.0/en/alter-table-problems.html
If you get a duplicate-key error when using ALTER TABLE to change the character set or collation of a character column, the cause is either that the new column collation maps two keys to the same value or that the table is corrupted. In the latter ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-columns-table.html
For related usage information and examples, see Section 17.15.3, “InnoDB INFORMATION_SCHEMA Schema Object Tables”. The INNODB_COLUMNS table has these columns: TABLE_ID An identifier representing the table associated with the column; the same ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-host-cache-table.html
The host_cache_size system variable controls the size of the host cache, as well as the size of the host_cache table. Because the host_cache table exposes the contents of the host cache, it can be examined using SELECT statements. The host_cache ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-log-status-table.html
The log_status table provides information that enables an online backup tool to copy the required log files without locking those resources for the duration of the copy process. When the log_status table is queried, the server blocks logging and ...