Concurrent table creation - sql

Question

Have a situation when table can be created from different places.
So, I have ~10 working applications, that can simultaneously try to create a same table.
Question. How can I synchronize them ? So I don't have any exceptions or errors ?
All instances of the application are trying to create a new table when the day ends, so when there is something like 00:00:00 they all will try to create it.
Sorry, for possible 'stupid question', have been googling for a while, no results.
Thank you.

Answer 1

You can use sp_getapplock to take arbitrary locks. You could make your app take such a lock before creating the table. Like that:
exec sp_getapplock
if tabledoesnotexist
create table ...

Answer 2

As alluded to in the comments, your first step is to perform an existence check. Then, on the off chance that there are two simultaneous creations you can use TRY...CATCH.
IF Object_ID('test', 'U') IS NULL
BEGIN
BEGIN TRY
CREATE TABLE test ( a int )
END TRY
BEGIN CATCH
SELECT Error_Message()
END CATCH
END
UPDATE
You do not want to create a table every day. Seriously. This is very poor database design.
Instead you want to add a datetime column to your table that indicates when each record was created.

Answer 3

Can you please go through the following code ... Concurrent execution is handled using ISOLATION LEVEL SERIALIZABLE.
CREATE PROCEDURE [dbo].[GetNextID](
#IDName nvarchar(255)
)
AS
BEGIN
/*
Description: Increments and returns the LastID value from tblIDs
for a given IDName
Author: Max Vernon
Date: 2012-07-19
*/
DECLARE #Retry int;
DECLARE #EN int, #ES int, #ET int;
SET #Retry = 5;
DECLARE #NewID int;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SET NOCOUNT ON;
WHILE #Retry > 0
BEGIN
BEGIN TRY
BEGIN TRANSACTION;
SET #NewID = COALESCE((SELECT LastID FROM tblIDs WHERE IDName = #IDName),0)+1;
IF (SELECT COUNT(IDName) FROM tblIDs WHERE IDName = #IDName) = 0
INSERT INTO tblIDs (IDName, LastID) VALUES (#IDName, #NewID)
ELSE
UPDATE tblIDs SET LastID = #NewID WHERE IDName = #IDName;
COMMIT TRANSACTION;
SET #Retry = -2; /* no need to retry since the operation completed */
END TRY
BEGIN CATCH
IF (ERROR_NUMBER() = 1205) /* DEADLOCK */
SET #Retry = #Retry - 1;
ELSE
BEGIN
SET #Retry = -1;
SET #EN = ERROR_NUMBER();
SET #ES = ERROR_SEVERITY();
SET #ET = ERROR_STATE()
RAISERROR (#EN,#ES,#ET);
END
ROLLBACK TRANSACTION;
END CATCH
END
IF #Retry = 0 /* must have deadlock'd 5 times. */
BEGIN
SET #EN = 1205;
SET #ES = 13;
SET #ET = 1
RAISERROR (#EN,#ES,#ET);
END
ELSE
SELECT #NewID AS NewID;
END
GO