Question

对于每个https://docs.microsoft.com/en-us/sql/relational-databases/indexes/columnstore-indexes-data-loading-guidance?view=sql-server-2017，我们都对列存储索引的批量加载操作进行了一些优化，每当我们尝试将其插入CCI时，都会得到以下结果：

Location:    columnset.cpp:3707
Expression:  !pColBinding->IsLobAccessor()
SPID:        55
Process ID:  1988
Msg 3624, Level 20, State 1, Line 3
A system assertion check has failed. Check the SQL Server error log for details. Typically, an assertion failure is caused by a software bug or data corruption. To check for database corruption, consider running DBCC CHECKDB. If you agreed to send dumps to Microsoft during setup, a mini dump will be sent to Microsoft. An update might be available from Microsoft in the latest Service Pack or in a Hotfix from Technical Support.
Msg 596, Level 21, State 1, Line 0
Cannot continue the execution because the session is in the kill state.
Msg 0, Level 20, State 0, Line 0
A severe error occurred on the current command.  The results, if any, should be discarded.

没有数据损坏-DBCC CHECKDB运行无错误。插入少量行可以成功，但是当我们尝试超过1000行时会失败（我们没有尝试找出发生错误的确切数目，但是我们也尝试了超过一百万行）。我们正在运行SQL Server 2017 14.0.3223.3。

如何重现该问题：

第1步：创建样本登台表

CREATE TABLE [dbo].[Data](
    [Id] [bigint] IDENTITY(1,1) NOT NULL,
    [Description] [varchar](50) NOT NULL,
    [JSON] [nvarchar](max) NOT NULL,
 CONSTRAINT [PK_Data] PRIMARY KEY CLUSTERED 
(
    [Id] 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].[Data]  WITH CHECK ADD  CONSTRAINT [CK_Data] CHECK  ((isjson([JSON])=(1)))
GO

ALTER TABLE [dbo].[Data] CHECK CONSTRAINT [CK_Data]
GO

第2步：在过渡表中填充示例数据（我们的JSON列超过100KB）

DECLARE @i INT = 1
WHILE (@i < 1000)
BEGIN
    INSERT INTO Data
    SELECT 'Test' AS Description, BulkColumn as JSON
    FROM OPENROWSET (BULK 'C:\Temp\JSON.json', SINGLE_CLOB) AS J
    SET @i = @i + 1
END

第3步：创建示例目标表和CCI

CREATE TABLE [dbo].[DataCCI](
    [Id] [bigint] IDENTITY(1,1) NOT NULL,
    [Description] [varchar](50) NOT NULL,
    [JSON] [nvarchar](max) NOT NULL
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

ALTER TABLE [dbo].[DataCCI]  WITH CHECK ADD  CONSTRAINT [CK_DataCCI] CHECK  ((isjson([JSON])=(1)))
GO

ALTER TABLE [dbo].[DataCCI] CHECK CONSTRAINT [CK_DataCCI]
GO

CREATE CLUSTERED COLUMNSTORE INDEX [cci] ON [dbo].[DataCCI] WITH (DROP_EXISTING = OFF, COMPRESSION_DELAY = 0) ON [PRIMARY]

GO

第4步：从样品转移到CCI的批量装载

INSERT INTO DataCCI WITH (TABLOCK)
SELECT Description, JSON FROM Data

我想念什么？有没有更好的方法可以做到这一点或解决方法？

谢谢。

Answer 1

我能够通过从目标表中删除约束来解决此问题。

干杯！

批量加载时断言检查失败

1 个答案: