如何从 Table 中删除分区？

Question

我已设法将分区添加到 Table（日志），但需要创建回滚脚本以防需要删除。不幸的是，这现在失败了，并且由于回滚脚本中途失败，Logs 现在没有主键，而且我无法将其添加回来，因为我收到错误...

Column 'SuperLogId' is partitioning column of the index 'PK__Logs__0E6B88F2'. Partition columns for a unique index must be a subset of the index key.

尝试运行时：

ALTER TABLE dbo.Logs
ADD PRIMARY KEY CLUSTERED (Id ASC)

所以我尝试按照本指南 (https://www.patrickkeisler.com/2013/01/how-to-remove-undo-table-partitioning.html) 进行操作，但最终不得不编写它来生成一个脚本来合并我所有动态创建的分区。

DECLARE @partitionsTable dbo.NVarCharCollectionTableType --User-defined table type to hold a collection of NVarChars.

INSERT INTO @partitionsTable
SELECT CONCAT('ALTER PARTITION FUNCTION Logs_SuperLogId_PartitionFunction() MERGE RANGE (', CONVERT(NVARCHAR, [Value]), ')')
FROM SYS.PARTITION_SCHEMES
INNER JOIN SYS.PARTITION_FUNCTIONS ON PARTITION_FUNCTIONS.FUNCTION_ID = PARTITION_SCHEMES.FUNCTION_ID
INNER JOIN SYS.PARTITION_RANGE_VALUES ON PARTITION_RANGE_VALUES.FUNCTION_ID = PARTITION_FUNCTIONS.FUNCTION_ID
WHERE PARTITION_SCHEMES.Name = 'Logs_SuperLogId_PartitionScheme'
AND PARTITION_FUNCTIONS.Name = 'Logs_SuperLogId_PartitionFunction'
ORDER BY [Value] ASC

DECLARE @statement NVARCHAR(MAX)

SELECT @statement =
    CASE
        WHEN @statement IS NULL
        THEN CAST([Text] AS NVARCHAR(MAX))
        ELSE CONCAT(@statement, '; ', [Text])
    END
    FROM @partitionsTable
    ORDER BY [Text] ASC

SELECT @statement

EXECUTE SP_EXECUTESQL @statement

ALTER PARTITION SCHEME Logs_SuperLogId_PartitionScheme NEXT USED [PRIMARY]

指南建议这会有所帮助，但没有帮助！我在尝试重新添加主键时仍然遇到同样的错误，并且在尝试删除分区函数和分区方案时仍然遇到这些错误！

DROP PARTITION SCHEME Logs_SuperLogId_PartitionScheme

The partition scheme "Logs_SuperLogId_PartitionScheme" is currently being used to partition one or more tables.

DROP PARTITION FUNCTION CatLogs_CatSessionLogId_PartitionFunction

Partition function 'Logs_SuperLogId_PartitionFunction' is being used by one or more partition schemes.

我的分区方案如何仍在使用？为什么我不能摆脱它并且不再使用它？我只想取消分区我的日志 table 并重新添加它原来的聚簇主键（我之前必须删除它并用非聚簇主键替换以使 SuperLogId 有一个聚簇索引所以它可以分区）。

更新：

我能够使用以下技巧从我的 table 中删除分区，但我仍然无法删除分区方案或函数。

--HACK: Dummy Index to disassociate the table from the partitioning scheme.
CREATE CLUSTERED INDEX IX_Logs_Id ON dbo.Logs(Id) ON [Primary]

--Now that the table has been disassociated with the partition, this dummy index can be dropped.
DROP INDEX IX_Logs_Id ON dbo.Logs

从运行开始，我就用这个脚本来找出哪些 table 正在使用我的数据库中的任何分区，但它 returns 没有，正如预期的那样。

SELECT DISTINCT TABLES.NAME
FROM SYS.PARTITIONS
INNER JOIN SYS.TABLES ON PARTITIONS.OBJECT_ID = TABLES.OBJECT_ID
WHERE PARTITIONS.PARTITION_NUMBER <> 1

这允许我重新添加主键，但在尝试删除分区方案时我仍然遇到 The partition scheme "Logs_SuperLogId_PartitionScheme" is currently being used... 错误。

根据 Microsoft 文档 (https://docs.microsoft.com/en-us/sql/t-sql/statements/drop-partition-scheme-transact-sql?view=sql-server-2017)，如果没有 table 或索引引用它，分区方案应该是可删除的。因此我随后也运行这个脚本来检查使用它的索引...

SELECT DISTINCT indexes.NAME
FROM SYS.PARTITIONS
INNER JOIN SYS.indexes ON indexes.index_id = partitions.index_id
WHERE PARTITIONS.PARTITION_NUMBER <> 1

...它什么也没返回！那么到底是什么在使用我的分区方案？！

Answer 1

我能够使用以下代码从 table 中删除分区。

--HACK: Dummy Index to disassociate the table from the partitioning scheme.
CREATE CLUSTERED INDEX IX_Logs_Id ON dbo.Logs(Id) ON [Primary]

--Now that the table has been disassociated with the partition, this dummy index can be dropped.
DROP INDEX IX_Logs_Id ON dbo.Logs

然后，使用以下脚本，发现两个索引仍然保留在分区方案上。

SELECT SCHEMA_NAME(B.SCHEMA_ID) SCHEMANAME, B.NAME TABLENAME, C.INDEX_ID, C.NAME INDEXNAME, C.TYPE_DESC,
A.PARTITION_NUMBER, D.NAME DATASPACENAME, F.NAME SCHEMADATASPACENAME,
H.VALUE DATARANGEVALUE, A.ROWS,
J.IN_ROW_RESERVED_PAGE_COUNT, J.LOB_RESERVED_PAGE_COUNT,
J.IN_ROW_RESERVED_PAGE_COUNT+J.LOB_RESERVED_PAGE_COUNT TOTALPAGECOUNT,
I.LOCATION
FROM SYS.PARTITIONS A
JOIN SYS.TABLES B ON A.OBJECT_ID = B.OBJECT_ID
JOIN SYS.INDEXES C ON A.OBJECT_ID = C.OBJECT_ID AND A.INDEX_ID = C.INDEX_ID
JOIN SYS.DATA_SPACES D ON C.DATA_SPACE_ID = D.DATA_SPACE_ID
LEFT JOIN SYS.DESTINATION_DATA_SPACES E ON E.PARTITION_SCHEME_ID = D.DATA_SPACE_ID AND A.PARTITION_NUMBER = E.DESTINATION_ID
LEFT JOIN SYS.DATA_SPACES F ON E.DATA_SPACE_ID = F.DATA_SPACE_ID 
LEFT JOIN SYS.PARTITION_SCHEMES G ON D.NAME = G.NAME
LEFT JOIN SYS.PARTITION_RANGE_VALUES H ON G.FUNCTION_ID = H.FUNCTION_ID AND H.BOUNDARY_ID = A.PARTITION_NUMBER
LEFT JOIN (SELECT DISTINCT DATA_SPACE_ID, LEFT(PHYSICAL_NAME, 1) LOCATION FROM SYS.DATABASE_FILES) I ON I.DATA_SPACE_ID = ISNULL(F.DATA_SPACE_ID, D.DATA_SPACE_ID)
LEFT JOIN SYS.DM_DB_PARTITION_STATS J ON J.OBJECT_ID = A.OBJECT_ID AND J.INDEX_ID = A.INDEX_ID AND J.PARTITION_NUMBER = A.PARTITION_NUMBER
ORDER BY 1, 2, 3, A.PARTITION_NUMBER

我所要做的就是删除引用分区方案的两个索引，这样我就可以删除分区方案，然后是分区函数。

如何从 Table 中删除分区？

How does one Remove a Partition from a Table?

tsql

sql-server

partitioning