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Search Results
https://dev.mysql.com/doc/refman/8.0/en/derived-condition-pushdown-optimization.html
This includes WHERE conditions having multiple predicates joined with AND, OR, or both. The optimization cannot be used if the derived table is an inner table of an outer join. MySQL 8.0.22 and later supports derived condition pushdown for eligible ...
https://dev.mysql.com/doc/refman/8.0/en/example-maximum-row.html
Task: Find the number, dealer, and price of the most expensive article.
https://dev.mysql.com/doc/refman/8.0/en/faqs-views.html
Can you insert into views that are based on joins? A.6.1. Can you insert into views that are based on joins? It is possible, provided that your INSERT statement has a column list that makes it clear there is only one table involved. What happens to ...
https://dev.mysql.com/doc/refman/8.0/en/fulltext-natural-language.html
If the query joins tables, the full-text index scan must be the leftmost non-constant table in the join. By default or with the IN NATURAL LANGUAGE MODE modifier, the MATCH() function performs a natural language search for a string against a text ...
https://dev.mysql.com/doc/refman/8.0/en/grant-tables.html
Operations that are performed as non-locking reads on MySQL grant tables include: SELECT statements and other read-only statements that read data from grant tables through join lists and subqueries, including SELECT ... DML operations that read data ... The mysql system database includes several grant tables that contain information about user accounts and the privileges held by ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-compatibility-communication.html
To check the group's communication protocol version, issue the following statement on any member: SELECT group_replication_get_communication_protocol(); The return value shows the oldest MySQL Server version that can join this group and use the ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-functions-for-communication-protocol.html
Return value: The oldest MySQL Server version that can join this group and use the group's communication protocol. group_replication_set_communication_protocol() Downgrade the Group Replication communication protocol version of a group so that ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-offline-upgrade.html
If you upgrade all the members of a replication group when they are offline and then restart the group, the members join using the new release's Group Replication communication protocol version, so that becomes the group's communication protocol ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-online-upgrade-considerations.html
When upgrading an online group you should consider the following points: Regardless of the way which you upgrade your group, it is important to disable any writes to group members until they are ready to rejoin the group. When MySQL 5.7.22 or MySQL ...When a member is stopped, the super_read_only variable is set to on automatically, but this change is not ...
https://dev.mysql.com/doc/refman/8.0/en/group-replication-online-upgrade-methods.html
In other words servers with a newer version can join the group only as secondaries. In this method there is only ever one group, and each server instance is removed from the group, upgraded and then rejoined to the group. This is because if a member ... Choose one of the following methods of upgrading a Group Replication group: Rolling In-Group Upgrade This method is supported provided that servers running a newer version are not generating workload to the group while there are still servers with an older version in ...