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https://dev.mysql.com/doc/refman/8.0/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/8.0/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/8.0/en/update.html
For information about generated columns, see Section 15.1.20.8, “CREATE TABLE and Generated Columns”. UPDATE is a DML statement that modifies rows in a table. An UPDATE statement can start with a WITH clause to define common table expressions ...The SET clause indicates which columns to modify and the values they should be ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-trx-table.html
The INNODB_TRX table provides information about every transaction currently executing inside InnoDB, including whether the transaction is waiting for a lock, when the transaction started, and the SQL statement the transaction is executing, if any.
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-setup-actors-table.html
Modifications to the setup_actors table affect only foreground threads created subsequent to the modification, not existing threads. The setup_actors table contains information that determines whether to enable monitoring and historical event ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-events-table.html
The EVENTS table provides information about Event Manager events, which are discussed in Section 27.4, “Using the Event Scheduler”. The EVENTS table has these columns: EVENT_CATALOG The name of the catalog to which the event belongs. DEFINER ...
https://dev.mysql.com/doc/refman/8.0/en/replication-gtids-concepts.html
A global transaction identifier (GTID) is a unique identifier created and associated with each transaction committed on the server of origin (the source). The MySQL system table mysql.gtid_executed is used to preserve the assigned GTIDs of all the ...This identifier is unique not only to the server on which it originated, but is unique across all servers in a given replication ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-filter-definitions.html
The preceding definition can be written like this: { "filter": { "class": [ { "name": [ "connection", "general", "table_access" ] } ] } } Logging Specific Event Subclasses To select specific event subclasses, use an event item containing a name item ...For information about using JSON data in MySQL, see Section 13.5, “The JSON Data ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-locks-set.html
If you have no indexes suitable for your statement and MySQL must scan the entire table to process the statement, every row of the table becomes locked, which in turn blocks all inserts by other users to the table. It is important to create good ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-page-compression.html
Page compression is enabled by specifying the COMPRESSION attribute with CREATE TABLE or ALTER TABLE. Enabling Page Compression To enable page compression, specify the COMPRESSION attribute in the CREATE TABLE statement. For example: CREATE TABLE t1 ... InnoDB supports page-level compression for tables that reside in file-per-table ...