错误 13542 为现有表启用系统版本控制

Question

我正在尝试为包含数据的 SQL Server 2016 数据库中的某些现有表启用系统版本控制。我正在遵循Microsoft 的这些说明。

其中一张表如下所示：

CREATE TABLE [dbo].[ClientBeacon](
    [ClientId] [int] NOT NULL,
    [BeaconId] [int] NOT NULL,
    [FromDate] [datetime] NOT NULL,
    [ToDate] [datetime] NULL,
    [Deleted] [bit] NOT NULL,
    [ModifiedByUserId] [nvarchar](128) NOT NULL,
    [ModifiedOn] [datetime] NOT NULL,
    [Timestamp] [timestamp] NOT NULL,
    CONSTRAINT [PK_ClientBeacon] PRIMARY KEY CLUSTERED 
    (
        [ClientId] ASC,
        [BeaconId] ASC
    )
)

我试图运行的脚本如下所示：

CREATE SCHEMA History;   
GO

ALTER TABLE dbo.ClientBeacon   
   ADD   
      SysStartTime datetime2(0) GENERATED ALWAYS AS ROW START HIDDEN CONSTRAINT DF_ClientBeacon_SysStartTime DEFAULT SYSUTCDATETIME(),
      SysEndTime datetime2(0) GENERATED ALWAYS AS ROW END HIDDEN CONSTRAINT DF_ClientBeacon_SysEndTime DEFAULT CONVERT(datetime2 (0), '9999-12-31 23:59:59'),   
      PERIOD FOR SYSTEM_TIME (SysStartTime, SysEndTime);   
GO   

ALTER TABLE dbo.ClientBeacon SET (SYSTEM_VERSIONING = ON (HISTORY_TABLE = History.ClientBeacon));
GO

运行脚本的结果是如下错误：

Msg 13542, Level 16, State 0, Line 4
ADD PERIOD FOR SYSTEM_TIME on table 'test.dbo.ClientBeacon' failed because there are open records with start of period set to a value in the future.
Msg 13510, Level 16, State 1, Line 11
Cannot set SYSTEM_VERSIONING to ON when SYSTEM_TIME period is not defined.

关于此错误，我找不到太多信息。在这篇文章的评论中有一个建议，如果 UTC 早于服务器时间，则在默认情况下使用 UTC 可能是一个问题，但我在英国夏令时，比 UTC 早一个小时。我试过使用GETDATE以防万一，但发生了同样的错误。

Answer 1

我有类似的问题，将 alter table 分成两个单独的语句解决了它。尝试

ALTER TABLE dbo.ClientBeacon ADD 
  datetime2(0) GENERATED ALWAYS AS ROW START HIDDEN CONSTRAINT F_ClientBeacon_SysStartTime DEFAULT SYSUTCDATETIME(),
  SysEndTime datetime2(0) GENERATED ALWAYS AS ROW END HIDDEN CONSTRAINT DF_ClientBeacon_SysEndTime DEFAULT CONVERT(datetime2 (0), '9999-12-31 23:59:59');

GO

ALTER TABLE dbo.ClientBeacon ADD 
  PERIOD FOR SYSTEM_TIME (SysStartTime, SysEndTime);

GO