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https://dev.mysql.com/doc/refman/8.0/en/switchable-optimizations.html
The following list describes the permissible opt_name flag names, grouped by optimization strategy: Batched Key Access Flags batched_key_access (default off) Controls use of BKA join algorithm. Limit Optimization Flags prefer_ordering_index (default ...Its value is a set of flags, each of which has a value of on or off to indicate whether the corresponding optimizer behavior is enabled or ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-information-schema-tables.html
They provide information about thread pool operation: TP_THREAD_GROUP_STATE: Information about thread pool thread group states TP_THREAD_GROUP_STATS: Thread group statistics TP_THREAD_STATE: Information about thread pool thread states Rows in these ... Note As of MySQL 8.0.14, the INFORMATION_SCHEMA thread pool tables are also available as Performance Schema ...
https://dev.mysql.com/doc/refman/8.0/en/version-tokens-usage.html
An administrative or management application that communicates with the servers and organizes them into high-availability groups. Groups serve different purposes, and servers within each group may have different assignments. Assignment of a server ...
https://dev.mysql.com/doc/refman/8.0/en/where-optimization.html
HAVING is merged with WHERE if you do not use GROUP BY or aggregate functions (COUNT(), MIN(), and so on). If all columns in ORDER BY and GROUP BY clauses come from the same table, that table is preferred first when joining. If there is an ORDER BY ... This section discusses optimizations that can be made for processing WHERE ...
https://dev.mysql.com/doc/refman/8.0/en/binary-installation.html
Create a mysql User and Group If your system does not already have a user and group to use for running mysqld, you may need to create them. The following commands add the mysql group and the mysql user. You might want to call the user and group ...
https://dev.mysql.com/doc/refman/8.0/en/connection-interfaces.html
The Group Replication plugin interacts with MySQL Server using internal sessions to perform SQL API operations. In those releases, if the server has reached the max_connections limit when Group Replication is started or attempts to perform an ...
https://dev.mysql.com/doc/refman/8.0/en/derived-tables.html
This does not work: SELECT AVG(SUM(column1)) FROM t1 GROUP BY column1; However, this query provides the desired information: SELECT AVG(sum_column1) FROM (SELECT SUM(column1) AS sum_column1 FROM t1 GROUP BY column1) AS t1; Notice that the column ...
https://dev.mysql.com/doc/refman/8.0/en/grant.html
CREATE TABLESPACE Enable tablespaces and log file groups to be created, altered, or dropped. [WITH GRANT OPTION] [AS user [WITH ROLE DEFAULT | NONE | ALL | ALL EXCEPT role [, role ] ... ] ] } GRANT PROXY ON user_or_role TO user_or_role [, ...
https://dev.mysql.com/doc/refman/8.0/en/internal-locking.html
FOR UPDATE statement for each group of rows expected to be modified, even if the data change statements come later in the transaction. Advantages of table-level locking: Relatively little memory required (row locking requires memory per row or group ... This section discusses internal locking; that is, locking performed within the MySQL server itself to manage contention for table contents by multiple ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-cluster-ndb-innodb-engines.html
The NDB storage engine is implemented using a distributed, shared-nothing architecture, which causes it to behave differently from InnoDB in a number of ways. For those unaccustomed to working with NDB, unexpected behaviors can arise due to its ...