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更新时间:2024-06-20 GMT+08:00
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执行表分区操作时,报错:start value of partition "xxx" NOT EQUAL up-boundary of last partition

问题现象

执行ALTER TABLE PARTITION时报错:

ERROR:start value of partition "XX" NOT EQUAL up-boundary of last partition.

原因分析

在同一条ALTER TABLE PARTITION语句中,既存在DROP PARTITION又存在ADD PARTITION时,无论它们的相对顺序是什么,GaussDB(DWS)总会先执行DROP PARTITION再执行ADD PARTITION。执行完DROP PARTITION删除末尾分区后,再执行ADD PARTITION操作会出现分区间隙,导致报错。

解决办法

为防止出现分区间隙,需要将ADD PARTITION的START值前移。

以分区表partitiontest为例:

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CREATE TABLE partitiontest 
( 
 c_int integer,
 c_time TIMESTAMP WITHOUT TIME ZONE
) 
PARTITION BY range (c_int) 
(
 partition p1 start(100)end(108), 
 partition p2 start(108)end(120) 
);  

执行如下两种语句会发生报错:

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ALTER TABLE partitiontest ADD PARTITION p3 start(120)end(130), DROP PARTITION p2;
ERROR:  start value of partition "p3" NOT EQUAL up-boundary of last partition.
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ALTER TABLE partitiontest DROP PARTITION p2,ADD PARTITION p3 start(120)end(130);
ERROR:  start value of partition "p3" NOT EQUAL up-boundary of last partition.

可以修改语句为:

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ALTER TABLE partitiontest ADD PARTITION p3 start(108)end(130), DROP PARTITION p2;
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ALTER TABLE partitiontest DROP PARTITION p2,ADD PARTITION p3 start(108)end(130);

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