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https://dev.mysql.com/doc/refman/8.0/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/8.0/en/information-schema-innodb-columns-table.html
HAS_DEFAULT A boolean value indicating whether a column that was added instantly using ALTER TABLE ... DEFAULT_VALUE The initial default value of a column that was added instantly using ALTER TABLE ... For related usage information and examples, see ...When a column is dropped, the remaining columns are reordered so that the sequence has no ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-role-table-grants-table.html
The ROLE_TABLE_GRANTS table (available as of MySQL 8.0.19) provides information about the table privileges for roles that are available to or granted by the currently enabled roles. The ROLE_TABLE_GRANTS table has these columns: GRANTOR The user ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/en/create-trigger.html
A trigger is a named database object that is associated with a table, and that activates when a particular event occurs for the table. The trigger becomes associated with the table named tbl_name, which must refer to a permanent table. You cannot ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-statement-digests.html
The copy of the normalized statement digest is stored in the appropriate Performance Schema tables, along with the SHA-256 hash value computed from the original normalized statement. Statement Digests in the Performance Schema In the Performance ...
https://dev.mysql.com/doc/refman/8.0/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/8.0/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/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. row ...COMPRESS_OPS ...
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 ...