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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-threads-table.html
The threads table contains a row for each server thread. When the Performance Schema initializes, it populates the threads table based on the threads in existence then. The INSTRUMENTED and HISTORY column values for new threads are determined by ...
https://dev.mysql.com/doc/refman/8.0/en/data-dictionary-usage-differences.html
ALTER TABLE tbl_name ENGINE=engine_name fails because it updates the storage engine designation, which is stored in the data dictionary. Use of a data dictionary-enabled MySQL server entails some operational differences compared to a server that ...
https://dev.mysql.com/doc/refman/8.0/en/upgrade-prerequisites.html
To identify such tables, execute this query: SELECT TABLE_SCHEMA, TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE ENGINE NOT IN ('innodb', 'ndbcluster') AND CREATE_OPTIONS LIKE '%partitioned%'; Any table reported by the query must be altered to use ...Preliminary checks: The following issues must not be present: There must be no tables that use obsolete data types or ... Before upgrading to the latest MySQL 8.0 release, ensure the ...
https://dev.mysql.com/doc/refman/8.0/en/update.html
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 accessible within the UPDATE. Single-table syntax: UPDATE [LOW_PRIORITY] [IGNORE] table_reference SET ...
https://dev.mysql.com/doc/refman/8.0/en/drop-table.html
Be careful with this statement! For each table, it removes the table definition and all table data. If the table is partitioned, the statement removes the table definition, all its partitions, all data stored in those partitions, and all partition ...They are permitted to make porting easier from other database ...
https://dev.mysql.com/doc/refman/8.0/en/information-schema-innodb-ft-index-table-table.html
The INNODB_FT_INDEX_TABLE table provides information about the inverted index used to process text searches against the FULLTEXT index of an InnoDB table. Before querying it, set the value of the innodb_ft_aux_table system variable to the name ...
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/information-schema-optimization.html
Applications that monitor databases may make frequent use of INFORMATION_SCHEMA tables. To write queries for these tables most efficiently, use the following general guidelines: Try to query only INFORMATION_SCHEMA tables that are views on 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. For example, in a UNION, scanned ... A locking read, an UPDATE, or a DELETE generally set record locks on every index record that is scanned in the processing of an SQL ...
https://dev.mysql.com/doc/refman/8.0/en/upgrading-what-is-upgraded.html
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 ...