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https://dev.mysql.com/doc/refman/8.0/en/order-by-optimization.html
Whether the optimizer actually does so depends on whether reading the index is more efficient than a table scan if columns not in the index must also be read. In that case, scanning an entire index and looking up table rows to find columns not in ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-hash.html
To partition a table using HASH partitioning, it is necessary to append to the CREATE TABLE statement a PARTITION BY HASH (expr) clause, where expr is an expression that returns an integer. In addition, you most likely want to follow this with ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-subpartitions.html
Subpartitioning—also known as composite partitioning—is the further division of each partition in a partitioned table. Consider the following CREATE TABLE statement: CREATE TABLE ts (id INT, purchased DATE) PARTITION BY RANGE( YEAR(purchased) ) ...Each of these partitions—p0, p1, and p2—is further divided into 2 ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-restrictions.html
If you save event information in another table, you should not assume that the original events remain available later. For example, if you select events from a performance_schema table into a temporary table, intending to join that table with the ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-thread-filtering.html
The threads table contains a row for each server thread. For the Performance Schema to monitor a thread, these things must be true: The thread_instrumentation consumer in the setup_consumers table must be YES. Monitoring occurs only for those ...
https://dev.mysql.com/doc/refman/8.0/en/privilege-changes.html
If the mysqld server is started without the --skip-grant-tables option, it reads all grant table contents into memory during its startup sequence. The in-memory tables become effective for access control at that point. If you modify the grant ...
https://dev.mysql.com/doc/refman/8.0/en/replication-rules-channel-based-filters.html
Channel specific replication filters are particularly useful in a multi-source replication topology when the same database or table is present on multiple sources, and the replica is only required to replicate it from one source. Overview of ...
https://dev.mysql.com/doc/refman/8.0/en/select-into.html
SELECT id, data INTO @x, @y FROM test.t1 LIMIT 1; INTO var_list can also be used with a TABLE statement, subject to these restrictions: The number of variables must match the number of columns in the table. If the table contains more than one row, ...INTO form of SELECT enables a query result to be stored in variables or written to a file: SELECT ...
https://dev.mysql.com/doc/refman/8.0/en/thread-pool-installation.html
Thread Pool Installation as of MySQL 8.0.14 Thread Pool Installation Prior to MySQL 8.0.14 Thread Pool Installation as of MySQL 8.0.14 In MySQL 8.0.14 and higher, the thread pool monitoring tables are Performance Schema tables that are loaded and ...
https://dev.mysql.com/doc/refman/8.0/en/faqs-stored-procs.html
You can manage stored procedures with CREATE [FUNCTION|PROCEDURE], ALTER [FUNCTION|PROCEDURE], DROP [FUNCTION|PROCEDURE], and SHOW CREATE [FUNCTION|PROCEDURE]. You can obtain information about existing stored procedures using the ROUTINES table in ...Where can I find documentation for MySQL stored procedures and stored functions? ...