當ClusterIndex有Partition時，PK(Noncluster)有什麼要求，才能正確的Partition Switch？- SQL Server

Posted by: Max Chen | in SQL Server, database | 1 year, 9 months ago |

答：

如果A表有PK

ALTER TABLE [A] SWITCH PARTITION 1 TO [B] PARTITION 1 則A的PK也必須要Partiton, 也就是

(1)A表 PK也必須包含Partition的欄位

(2)A的PK並且不能只單純ON在FileGroup上,而是要真的Partition

(3)A的PK的Partition Schema可以與 A的Cluster的Partition Schema不同,也可正確Partition Switch過去 (這點Partition時,是Noncluster Index都是如此)

滿足以上條件就可以成功Partition Switch 否則會產生以下錯誤：

‘ALTER TABLE SWITCH’ statement failed. The table ‘A’ is partitioned while index ‘PK_A’ is not partitioned.

B表可以不要求要有PK! (這點Partition時,是Noncluster Index都是如此)

但若B表有PK則其PK也要滿足以上條件(1)(2),否則會出現

‘ALTER TABLE SWITCH’ statement failed. The table ‘A’ is partitioned while index ‘PK_B’ is not partitioned.

而若B表有PK,條件(3)其Partition必須保證與A表一一對應(A怎麼用哪個Parttition Schema, B就用哪個) (這點Partition時,是Noncluster Index都是如此)

ALTER TABLE SWITCH statement failed. There is no identical index in source table ‘A’ for the index ‘PK_B’ in target table ‘B’ .

參考來源:

ALTER TABLE (Transact-SQL) - SQL Server
Applies to: SQL Server (all supported versions) Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics…docs.microsoft.com https://dotblogs.com.tw/rockchang/2017/08/11/113423

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SQL Server

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Max Chen (159)

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