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https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-locks-table.html
For InnoDB, to obtain details about the transaction, join this column with the TRX_ID column of the INFORMATION_SCHEMA INNODB_TRX table. To obtain details about the thread, join this column with the THREAD_ID column of the Performance Schema threads ...For information about which lock requests are blocked by which held locks, see Section 29.12.13.2, “The data_lock_waits ...
https://dev.mysql.com/doc/refman/8.0/en/replication-privilege-checks-gr.html
The group_replication_applier thread on each group member is used for applying the group's transactions, and the group_replication_recovery thread on each group member is used for state transfer from the binary log as part of distributed recovery ...
https://dev.mysql.com/doc/refman/8.0/en/subqueries.html
They provide alternative ways to perform operations that would otherwise require complex joins and unions. Many people find subqueries more readable than complex joins or unions. A subquery can contain many of the keywords or clauses that an ...All ...
https://dev.mysql.com/doc/refman/8.0/en/temporary-table-problems.html
For example, the following does not work: SELECT * FROM temp_table JOIN temp_table AS t2; The statement produces this error: ERROR 1137: Can't reopen table: 'temp_table' You can work around this issue if your query permits use of a common table ...
https://dev.mysql.com/doc/refman/8.0/en/using-explain.html
That is, MySQL explains how it would process the statement, including information about how tables are joined and in which order. You can also use EXPLAIN to check whether the optimizer joins the tables in an optimal order. To give a hint to the ...
https://dev.mysql.com/doc/refman/8.0/en/xml-functions.html
To find elements for which the same attribute matches any of several values, you can use multiple locators joined by the | operator. Note The difference between or and | is that or joins conditions, while | joins result sets. Table 14.16 XML ...
https://dev.mysql.com/doc/refman/8.0/en/ansi-diff-foreign-keys.html
For example, if you define a RESTRICT type constraint, and there is a child row with several parent rows, InnoDB does not permit the deletion of any of the parent rows. If ON UPDATE CASCADE or ON UPDATE SET NULL recurses to update the same table it ...
https://dev.mysql.com/doc/refman/8.0/en/audit-log-file-formats.html
For example, the following statement generates one Query event, two TableRead events, and a TableInsert events: INSERT INTO t3 SELECT t1.* FROM t1 JOIN t2; Each TableXXX event contains <TABLE> and <DB> elements to identify the table to which the ...
https://dev.mysql.com/doc/refman/8.0/en/comparisons-using-subqueries.html
Here is an example of a common-form subquery comparison that you cannot do with a join. The most common use of a subquery is in the form: non_subquery_operand comparison_operator (subquery) Where comparison_operator is one of these operators: = > < ...
https://dev.mysql.com/doc/refman/8.0/en/create-tablespace.html
The precise syntax and semantics depend on the storage engine used. MySQL NDB Cluster also supports tablespaces using the NDB storage engine. Considerations for InnoDB Considerations for NDB Cluster Options Notes InnoDB Examples NDB Example ...