tiny change

Signed-off-by: nolouch <nolouch@gmail.com>
pingcap · Feb 13, 2023 · 12b0d10 · 12b0d10
1 parent 2529934
commit 12b0d10
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/placement-rules-in-sql.md b/placement-rules-in-sql.md
@@ -256,7 +256,7 @@ PARTITION BY RANGE( YEAR(purchased) ) (
 
 ``` sql
 	CREATE PLACEMENT POLICY multiaz SURVIVAL_PREFERENCES="[zone, host]";
-	CREATE PLACEMENT POLICY singleaz CONSTRAINTS="[+zone=zone1]" SURVIVAL_PREFERENCES="[rack]";
+	CREATE PLACEMENT POLICY singleaz CONSTRAINTS="[+zone=zone1]" SURVIVAL_PREFERENCES="[host]";
 ```
 
 对于以上例子，绑定了 `multiaz` 该放置策略的表，会以 3 副本的形式放置在不同的可用区里, 数据会先优先满足跨 `zone`（即可用区）级别数据隔离的生存目标，再满足跨 `host`（即机器）级别的数据隔离的生存目标；应用了 `singleaz` 放置策略的数据，会以 3 副本的形式放置在名为 `zone1` 这个可用区里, 再满足跨 `host`（即机器）级别的数据隔离的生存目标。