Skip to content

Commit

Permalink
sql: improve kill's description (#6233) (#6305)
Browse files Browse the repository at this point in the history
  • Loading branch information
ti-chi-bot authored Aug 27, 2021
1 parent 15248b7 commit a1dfa08
Showing 1 changed file with 3 additions and 2 deletions.
5 changes: 3 additions & 2 deletions sql-statements/sql-statement-kill.md
Original file line number Diff line number Diff line change
Expand Up @@ -33,8 +33,9 @@ Query OK, 0 rows affected (0.00 sec)

## MySQL compatibility

* By design, this statement is not compatible with MySQL by default. This helps prevent against a case of a connection being terminated on the wrong TiDB server, because it is common to place multiple TiDB servers behind a load balancer.
* The `KILL TIDB` statement is a TiDB extension. If you are certain that the session you are attempting to kill is on the same TiDB server, set [`compatible-kill-query = true`](/tidb-configuration-file.md#compatible-kill-query) in your configuration file.
* By design, `KILL` is not compatible with MySQL by default. This helps prevent against a case of a connection being terminated on the wrong TiDB server, because it is common to place multiple TiDB servers behind a load balancer.
* DO NOT set [`compatible-kill-query = true`](/tidb-configuration-file.md#compatible-kill-query) in your configuration file UNLESS you are certain that clients will be always connected to the same TiDB node. This is because pressing <kbd>ctrl</kbd>+<kbd>c</kbd> in the default MySQL client opens a new connection in which `KILL` is executed. If there are proxies in between, the new connection might be routed to a different TiDB node, which possibly kills a different session.
* The `KILL TIDB` statement is a TiDB extension, which is a different syntax from the MySQL `KILL [CONNECTION|QUERY]` command and the MySQL command-line <kbd>ctrl</kbd>+<kbd>c</kbd> feature. It is safe to use `KILL TIDB` on the same TiDB node.

## See also

Expand Down

0 comments on commit a1dfa08

Please sign in to comment.