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https://dev.mysql.com/doc/refman/8.0/en/semijoins.html
A semijoin is a preparation-time transformation that enables multiple execution strategies such as table pullout, duplicate weedout, first match, loose scan, and materialization. The optimizer uses semijoin strategies to improve subquery execution, ...
https://dev.mysql.com/doc/refman/8.0/en/setting-environment-variables.html
Environment variables can be set at the command prompt to affect the current invocation of your command processor, or set permanently to affect future invocations. To set a variable permanently, you can set it in a startup file or by using the ...
https://dev.mysql.com/doc/refman/8.0/en/show-binlog-events.html
SHOW BINLOG EVENTS [IN 'log_name'] [FROM pos] [LIMIT [offset,] row_count] Shows the events in the binary log. If you do not specify 'log_name', the first binary log is displayed. The LIMIT clause has the same syntax as for the SELECT statement.
https://dev.mysql.com/doc/refman/8.0/en/show-index.html
SHOW [EXTENDED] {INDEX | INDEXES | KEYS} {FROM | IN} tbl_name [{FROM | IN} db_name] [WHERE expr] SHOW INDEX returns table index information. This statement requires some privilege for any column in the table. row *************************** Table: ...
https://dev.mysql.com/doc/refman/8.0/en/slow-query-log.html
The slow query log consists of SQL statements that take more than long_query_time seconds to execute and require at least min_examined_row_limit rows to be examined. The slow query log can be used to find queries that take a long time to execute ...
https://dev.mysql.com/doc/refman/8.0/en/source-configuration-options.html
The CMake program provides a great deal of control over how you configure a MySQL source distribution. Typically, you do this using options on the CMake command line. For information about options supported by CMake, run either of these commands in ...
https://dev.mysql.com/doc/refman/8.0/en/spatial-geohash-functions.html
Geohash is a system for encoding latitude and longitude coordinates of arbitrary precision into a text string. Geohash values are strings that contain only characters chosen from "0123456789bcdefghjkmnpqrstuvwxyz". The functions in this section ...
https://dev.mysql.com/doc/refman/8.0/en/start-replica.html
START REPLICA [thread_types] [until_option] [connection_options] [channel_option] thread_types: [thread_type [, thread_type] ... ] thread_type: IO_THREAD | SQL_THREAD until_option: UNTIL { {SQL_BEFORE_GTIDS | SQL_AFTER_GTIDS} = gtid_set | ...
https://dev.mysql.com/doc/refman/8.0/en/string-types.html
The string data types are CHAR, VARCHAR, BINARY, VARBINARY, BLOB, TEXT, ENUM, and SET. For information about storage requirements of the string data types, see Section 13.7, “Data Type Storage Requirements”. For descriptions of functions that ...
https://dev.mysql.com/doc/refman/8.0/en/subquery-materialization.html
The optimizer uses materialization to enable more efficient subquery processing. Materialization speeds up query execution by generating a subquery result as a temporary table, normally in memory. The first time MySQL needs the subquery result, it ...