[英]Destination table partition is empty but alter table switch still fails stating destination partition must be empty
I am working with SQL Server 2008. I have two 100 partitioned tables of same structure, partition schema/function and same file group. 我正在使用SQL Server2008。我有两个具有相同结构,分区架构/功能和相同文件组的100个分区表。
Table structure: 表结构:
Create table source_table
(
id int,
XmlData xml,
Partitionkey ([id]%(100)) As Persisted
)
Create table Destination_table
(
id int,
XmlData xml,
Partitionkey ([id]%(100)) As Persisted
)
Requirement: 需求:
Destination_table
has records but partition 23 is empty. Destination_table
有记录,但分区23为空。 I need to move partition 23 records from Source_table
to Destination_table
. 我需要将分区23记录从
Source_table
移到Destination_table
。
ALTER TABLE Source_table
SWITCH partition 23 TO Destination_table partition 23
I get an error 我得到一个错误
ALTER TABLE SWITCH failed.
ALTER TABLE SWITCH失败。 The target partition 23 of Destination_table must be empty.
Destination_table的目标分区23必须为空。
The partition 23 of destination_table
is already empty. destination_table
的分区23已经为空。
Select count(1)
from destination_table
returns 0. 返回0。
Then why do I get this error? 那为什么我会得到这个错误?
Had a confusion between partition value and partition Id. 分区值和分区ID之间有混淆。 The partition value is 23 but the partition Id was 24 as the partition value started from 0 to 99 and the partition Id was 1 to 100.
分区值为23,但分区ID为24,因为分区值从0到99开始,分区ID为1到100。
So, the partition Id 24 worked for moving partition with value 23: 因此,分区ID 24用于移动值为23的分区:
ALTER TABLE Source_table SWITCH partition 24 TO Destination_table partition 24 ALTER TABLE Source_table切换分区24到Destination_table分区24
This structure would work 这种结构会起作用
Create table source_table
(
id int,
XmlData xml,
Partitionkey ((([id] - 1) % (100)) + 1) As Persisted
)
Create table Destination_table
(
id int,
XmlData xml,
Partitionkey ((([id] - 1) % (100)) + 1) As Persisted
)
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