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有一個SQL表正在快速增長,並且與內在數據相比不一致。爲了簡短起見,本表中有一個用於備份.txt文件內容的Windows服務,文件大小約爲1KB到45KB。因此用於存儲這些文本文件內容的nvarchar(max)列。SQL表增長不一致
在此表上運行的註釋sp_spaceused命令,這裏是結果:
name rows reserved data index_size unused
Files 20402 814872 KB 813416 KB 1048 KB 408 KB
但運行這個簡單的查詢,這給了我以字節爲單位由本表中使用的總數據量時,其結果是不在任何附近:(97231108字節)。
SELECT (SUM(DATALENGTH(A)) +
SUM(DATALENGTH(B)) +
SUM(DATALENGTH(C)) +
SUM(DATALENGTH(D)) +
SUM(DATALENGTH(E)) +
SUM(DATALENGTH(F)) +
SUM(DATALENGTH(G)) +
SUM(DATALENGTH(H)) +
SUM(DATALENGTH(I))) AS BytesUsed
FROM Files
RESULT: 97231108 bytes
的創建此表的語句是這樣的:
CREATE TABLE [dbo].[Files](
[A] [int] IDENTITY(33515427,1) NOT NULL,
[B] [nvarchar](100) NOT NULL,
[C] [nvarchar](max) NOT NULL,
[D] [nvarchar](100) NOT NULL,
[E] [datetime] NULL,
[F] [nvarchar](2) NULL,
[G] [datetime] NULL,
[H] [nvarchar](100) NULL,
[I] [int] NULL,
CONSTRAINT [PK_Files] PRIMARY KEY CLUSTERED
(
[A] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [UK_Files_FileType_FileDate] UNIQUE NONCLUSTERED
(
[D] ASC,
[E] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO
ALTER TABLE [dbo].[Files] WITH CHECK ADD CONSTRAINT [FK_Files_FileStatus] FOREIGN
KEY([F])
REFERENCES [dbo].[F] ([F])
GO
ALTER TABLE [dbo].[Files] CHECK CONSTRAINT [FK_Files_FileStatus]
GO
臨時修復:我已經重新創建表(DROP & CREATE),然後複製舊錶的數據到新的一個,這使桌子從65GB變成了108MB。
我的問題是:
- 是什麼讓這個表採取這麼大的空間,我怎麼能阻止它再次增長?