How to SET IDENTITY_INSERT ON in SQL Server 2008 for multiple tables at once

Question

I have two tables tblData1 and tblData2 and now I want to migrate records from another table with identity insert and I am trying to run a command as shown below

SET IDENTITY_INSERT LP1.dbo.tblData1 ON
GO

SET IDENTITY_INSERT LP1.dbo.tblData2 ON
GO

INSERT INTO LP1.DBO.tblData1 (ID,DATA)
SELECT ID,DATA FROM LP.DBO.tblData1
GO

INSERT INTO LP1.DBO.tblData2 (ID,DATA)
SELECT ID,DATA FROM LP.DBO.tblData2
GO

SET IDENTITY_INSERT LP1.dbo.tblData1 OFF
GO

SET IDENTITY_INSERT LP1.dbo.tblData2 OFF
GO

But it is showing error as below

IDENTITY_INSERT is already ON for table 'Sample_Training.dbo.tblData1'. Cannot perform SET operation for table 'dbo.tblData2'

Is it possible to perform multiple IDENTITY_INSERT at time in SQL Server 2008

Answer 1

At any time, only one table in a session can have the IDENTITY_INSERT property set to ON.

So before enabling the other one, you should turn of existing if any.
If it is lesser number of tables you can turn on and turn off before and after your operations.
If the table count is huge, you should automate somehow to enable and disable before your operations.

Answer 2

Did you try changing the order

go

SET IDENTITY_INSERT LP1.dbo.tblData1 ON

INSERT INTO LP1.DBO.tblData1
            (ID,DATA)
SELECT ID,DATA
FROM   LP.DBO.tblData1

SET IDENTITY_INSERT LP1.dbo.tblData1 OFF

GO

SET IDENTITY_INSERT LP1.dbo.tblData2 ON

INSERT INTO LP1.DBO.tblData2
            (ID,DATA)
SELECT ID,DATA
FROM   LP.DBO.tblData2

SET IDENTITY_INSERT LP1.dbo.tblData2 OFF

GO 

Answer 3

You can only set Identity_Insert for one table at a time in a single session. If there are no data dependancies between the tables, then you can open several sessions, each handling a different set of tables. Each session can set one table for identy_insert.