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https://dev.mysql.com/doc/refman/8.0/en/mysql-commands.html
mysql sends each SQL statement that you issue to the server to be executed. There is also a set of commands that mysql itself interprets. For a list of these commands, type help or \h at the mysql> prompt: mysql> help List of all MySQL commands: ...
https://dev.mysql.com/doc/refman/8.0/en/mysql-installation-windows-path.html
To make it easier to invoke MySQL programs, you can add the path name of the MySQL bin directory to your Windows system PATH environment variable: On the Windows desktop, right-click the My Computer icon, and select Properties. Next select the ...
https://dev.mysql.com/doc/refman/8.0/en/mysqldumpslow.html
The MySQL slow query log contains information about queries that take a long time to execute (see Section 7.4.5, “The Slow Query Log”). mysqldumpslow parses MySQL slow query log files and summarizes their contents. Normally, mysqldumpslow ...
https://dev.mysql.com/doc/refman/8.0/en/network-namespace-support.html
A connection may produce a result like this: $> mysql --user=admin --host=203.0.113.10 --protocol=tcp mysql> SELECT USER(); +--------------------+ | USER() | +--------------------+ | admin@198.51.100.2 | +--------------------+ In this case, the ...
https://dev.mysql.com/doc/refman/8.0/en/no-matching-rows.html
Select only those columns that are used in the WHERE clause. Issue a SELECT for the column that should have matched a row against the table that was last removed from the query. Open the file in an editor, remove some insert lines (if there are more ... If you have a complicated query that uses many tables but that returns no rows, you should use the following procedure to find out what is wrong: Test the query with EXPLAIN to check whether you can find something that is obviously ...
https://dev.mysql.com/doc/refman/8.0/en/option-defaults-equals.html
mysql> SELECT USER(); +---------------+ | USER() | +---------------+ | jon@localhost | +---------------+ 1 row in set (0.00 sec) This is not the same behavior as with the command line, where the equal sign is not required: $> mysql --user jon --host ...Due to this behavior, problems can occasionally arise when no value is provided for an option that expects ...
https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations-storage-engines.html
In MySQL 8.0, partitioning support is not actually provided by the MySQL Server, but rather by a table storage engine's own or native partitioning handler. In MySQL 8.0, only the InnoDB and NDB storage engines provide native partitioning handlers.
https://dev.mysql.com/doc/refman/8.0/en/partitioning-limitations.html
This section discusses current restrictions and limitations on MySQL partitioning support. The following constructs are not permitted in partitioning expressions: Stored procedures, stored functions, loadable functions, or plugins. For a list of ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-data-lock-waits-table.html
Example data lock wait information: mysql> SELECT * FROM performance_schema.data_lock_waits\G *************************** 1. The data_lock_waits table requires the usual Performance Schema privilege of SELECT on the table to be selected from. The ...
https://dev.mysql.com/doc/refman/8.0/en/performance-schema-examples.html
You can determine what the thread is waiting for: SELECT * FROM performance_schema.events_waits_current WHERE THREAD_ID = thread_1; Say the query result identifies that the thread is waiting for mutex A, found in ... The Performance Schema is a tool ...