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https://dev.mysql.com/doc/refman/8.0/en/sys-schema-redundant-indexes.html
The schema_redundant_indexes view displays indexes that duplicate other indexes or are made redundant by them. In the following column descriptions, the dominant index is the one that makes the redundant index redundant. The ...
https://dev.mysql.com/doc/refman/8.0/en/show-create-trigger.html
row *************************** Trigger: ins_sum sql_mode: ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES, NO_ZERO_IN_DATE,NO_ZERO_DATE, ERROR_FOR_DIVISION_BY_ZERO, NO_ENGINE_SUBSTITUTION SQL Original Statement: CREATE DEFINER=`me`@`localhost` TRIGGER ...
https://dev.mysql.com/doc/refman/8.0/en/comparisons-using-subqueries.html
WHERE 'a' = (SELECT column1 FROM t1) MySQL also permits this construct: non_subquery_operand LIKE (subquery) At one time the only legal place for a subquery was on the right side of a comparison, and you might still find some old DBMSs that insist ... 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: = > < >= <= <> != <=> For example: ...
https://dev.mysql.com/doc/refman/8.0/en/execute.html
Parameter values can be supplied only by user variables, and the USING clause must name exactly as many variables as the number of parameter markers in the statement. You can execute a given prepared statement multiple times, passing different ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-migration.html
This may seem more complicated, but ultimately saves time and trouble. Where can I find information on how to upgrade or downgrade MySQL? A.8.1. Where can I find information on how to upgrade or downgrade MySQL? For detailed upgrade information, see ...
https://dev.mysql.com/doc/refman/8.0/en/innodb-transaction-scheduling.html
lock_schedule_refreshes The number of times the wait-for graph was analyzed to update the scheduled transaction weights. Note Prior to MySQL 8.0.20, InnoDB also uses a First In First Out (FIFO) algorithm to schedule transactions, and the CATS ...
https://dev.mysql.com/doc/refman/8.0/en/monitoring-performance-schema.html
You can query the tables in the performance_schema database to see real-time information about the performance characteristics of your server and the applications it is running.
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-cluster-transactions.html
The cluster_transactions table shows information about all ongoing transactions in an NDB Cluster. (Currently, the MySQL Server does not expose the NDB API transaction ID of an ongoing transaction.) block_instance refers to an instance of a kernel ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndbinfo-server-transactions.html
The server_transactions table is subset of the cluster_transactions table, but includes only those transactions in which the current SQL node (MySQL Server) is a participant, while including the relevant connection IDs. Together with the block ...
https://dev.mysql.com/doc/refman/8.0/en/no-matching-rows.html
Remove one table at a time from the query until it returns some rows. Open the file in an editor, remove some insert lines (if there are more than needed to demonstrate the problem), and add your SELECT statement at the end of the file. Verify that ... If you have a complicated query that uses many tables but that returns no rows, you should use the following procedure to find out what is wrong: Test the query with EXPLAIN to check whether you can find something that is obviously ...