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https://dev.mysql.com/doc/refman/5.7/en/group-replication-user-credentials.html
Group Replication uses the asynchronous replication protocol to achieve Section 17.9.5, “Distributed Recovery”, synchronizing group members before joining them to the group. The distributed recovery process relies on a replication channel named ...Therefore you need to set up a replication user with the correct permissions so that Group Replication can establish direct member-to-member recovery replication ...
https://dev.mysql.com/doc/refman/5.7/en/innodb-information-schema-system-tables.html
InnoDB INFORMATION_SCHEMA system tables can be joined together through fields such as TABLE_ID, INDEX_ID, and SPACE, allowing you to easily retrieve all available data for an object you want to study or monitor. Example 14.4 Joining InnoDB ... You ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-option-tables.html
Ndb_pushed_queries_defined: Number of joins that API nodes have attempted to push down to data nodes. Ndb_pushed_queries_dropped: Number of joins that API nodes have tried to push down, but failed. Ndb_pushed_queries_executed: Number of joins ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-cluster-what-is-new-7-5.html
Using this relationship you can write a join on these two tables to obtain the default, maximum, minimum, and current values for one or more NDB Cluster configuration parameters by name. Major changes and new features in NDB Cluster 7.5 which are ...
https://dev.mysql.com/doc/refman/5.7/en/mysql-command-options.html
--max-join-size=value Command-Line Format --max-join-size=value Type Numeric Default Value 1000000 The automatic limit for rows in a join when using --safe-updates. mysql supports the following options, which can be specified on the command line or ...
https://dev.mysql.com/doc/refman/5.7/en/optimizing-subqueries.html
For example: SELECT * FROM t1 WHERE t1.column1 IN (SELECT column1 FROM t2 ORDER BY column1); SELECT * FROM t1 WHERE t1.column1 IN (SELECT DISTINCT column1 FROM t2); SELECT * FROM t1 WHERE EXISTS (SELECT * FROM t2 LIMIT 1); Replace a join with a ...
https://dev.mysql.com/doc/refman/5.7/en/partitioning-range.html
A table that is partitioned by range is partitioned in such a way that each partition contains rows for which the partitioning expression value lies within a given range. Ranges should be contiguous but not overlapping, and are defined using the ...
https://dev.mysql.com/doc/refman/5.7/en/select-optimization.html
NDB Cluster supports a join pushdown optimization whereby a qualifying join is sent in its entirety to NDB Cluster data nodes, where it can be distributed among them and executed in parallel. For more information about this optimization, see ...
https://dev.mysql.com/doc/refman/5.7/en/update.html
Here is an example: UPDATE items,month SET items.price=month.price WHERE items.id=month.id; The preceding example shows an inner join that uses the comma operator, but multiple-table UPDATE statements can use any type of join permitted in SELECT ...
https://dev.mysql.com/doc/refman/5.7/en/where-optimization.html
For each table in a join, a simpler WHERE is constructed to get a fast WHERE evaluation for the table and also to skip rows as soon as possible. All of the following tables are used as constant tables: SELECT * FROM t WHERE primary_key=1; SELECT * ... This section discusses optimizations that can be made for processing WHERE ...