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https://dev.mysql.com/doc/refman/8.0/en/information-schema-key-column-usage-table.html
This table provides no information about functional key parts because they are expressions and the table provides information only about columns. The KEY_COLUMN_USAGE table has these columns: CONSTRAINT_CATALOG The name of the catalog to which the ...CONSTRAINT_SCHEMA The name of the schema (database) to which the constraint ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-system-variable-tables.html
System variable information is available in these Performance Schema tables: global_variables: Global system variables. An application that wants only global values should use this table. An application that wants all system variable values for its ... The MySQL server maintains many system variables that indicate how it is configured (see Section 7.1.8, “Server System ...
https://dev.mysql.com/doc/refman/8.0/en/table-scan-avoidance.html
The output from EXPLAIN shows ALL in the type column when MySQL uses a full table scan to resolve a query. This usually happens under the following conditions: The table is so small that it is faster to perform a table scan than to bother with a ...
https://dev.mysql.com/doc/refman/8.0/en/internal-locking.html
This section discusses internal locking; that is, locking performed within the MySQL server itself to manage contention for table contents by multiple sessions. Row-Level Locking Table-Level Locking Choosing the Type of Locking Row-Level Locking ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-system-variables.html
Even when the Performance Schema is disabled, it continues to populate the global_variables, session_variables, global_status, and session_status tables. This occurs as necessary to permit the results for the SHOW VARIABLES and SHOW STATUS ...The ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-indexes-table.html
For GEN_CLUST_INDEX indexes, this value is 0 because the index is created using an artificial value rather than a real table column. Any other number represents a table created with a separate .ibd file in file-per-table mode. For related usage ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-columns-table.html
For information about generated columns, see Section 15.1.20.8, “CREATE TABLE and Generated Columns”. You can cause such information to be hidden by setting show_gipk_in_create_table_and_information_schema = OFF. The related ST_GEOMETRY_COLUMNS ...ORDINAL_POSITION is necessary because you might want to say ORDER BY ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-tp-thread-state-table.html
The tp_thread_state table has one row per thread created by the thread pool to handle connections. Note The Performance Schema table described here is available as of MySQL 8.0.14. Prior to MySQL 8.0.14, use the corresponding INFORMATION_SCHEMA ...
https://dev.mysql.com/doc/refman/8.0/en/replication-options-binary-log.html
For example, DDL statements such as CREATE TABLE and ALTER TABLE are always logged as statements, without regard to the logging format in effect, so the following statement-based rules for --binlog-do-db always apply in determining whether or not ...
https://dev.mysql.com/doc/refman/8.0/en/nontransactional-tables.html
This can happen if you try to create a table using a transactional storage engine that is not supported by your mysqld server (or that was disabled with a startup option). If mysqld does not support a storage engine, it instead creates the table as ... If you receive the following message when trying to perform a ROLLBACK, it means that one or more of the tables you used in the transaction do not support transactions: Warning: Some non-transactional changed tables couldn't be rolled back These nontransactional tables are not affected by the ROLLBACK ...