What's the best way to handle the growth of the mdm.tblTransaction table?

Question

Can anyone suggest a good way to handle the growth of the mdm.tblTransaction table? This table logs all the MDS transactions and the history of the data residing in it is required for auditing purposes. Hence we can't delete this data. I'm looking for options
on how we can maitain this table ongoing. It is going to perform badly eventually. We currently have 15 Million transactions in this table.
What options can we look at?

Answer 1

In the vnext sql server, MDS will support cleaning based on log retention policy.
In the sql2014/sql2012, you have to clean up the table manually.
An sample sproc that can be reused is attached below.
==============================================================================
Copyright (c) Microsoft Corporation. All Rights Reserved.
==============================================================================
SELECT * FROM mdm.tbl_7_TR where LastChgDTM < '2014-10-22';
EXEC mdm.udpLogCLeanup 7, '2014-10-22';
SELECT * FROM mdm.tbl_7_TR where LastChgDTM < '2014-10-22';
CREATE PROCEDURE mdm.udpTransactionsCleanup
@Model_ID INT,
@CleanupOlderThanDate DATE
WITH EXECUTE AS N'mds_schema_user' -- Execute as a user that has permission to select on [tblUserGroupAssignment], [tblBRBusinessRule], [udfSecurityUserBusinessRuleList]
AS BEGIN
SET NOCOUNT ON
DECLARE
@SQL NVARCHAR(MAX)
--Annotation table names
,@TransactionTableName sysname
,@AnnotationTableName sysname;
SET @TransactionTableName = 'tblTransaction';
SET @AnnotationTableName = 'tblTransactionAnnotation';
BEGIN TRY
--Delete all Annotations on transactions being deleted issues
SET @SQL = N'
DELETE [mdm].' + QUOTENAME(@AnnotationTableName) + N'
FROM [mdm].' + QUOTENAME(@AnnotationTableName) + N' as tannt
JOIN [mdm].'+ QUOTENAME(@TransactionTableName) + N' as txn ON tannt.Transaction_ID = txn.ID
JOIN [mdm].[tblModelVersion] as tmv ON txn.Version_ID = tmv.ID
WHERE tmv.Model_ID= @Model_ID AND txn.LastChgDTM <= @CleanupOlderThanDate
EXEC sp_executesql @SQL, N'@Model_ID INT, @CleanupOlderThanDate DATE', @Model_ID, @CleanupOlderThanDate;
--Delete all transactions older than the specified date
SET @SQL = N'
DELETE [mdm].' + QUOTENAME(@TransactionTableName) + N'
FROM [mdm].' + QUOTENAME(@TransactionTableName) + N' txn
JOIN [mdm].[tblModelVersion] tmv ON (txn.Version_ID = tmv.ID)
WHERE tmv.Model_ID = @Model_ID AND txn.LastChgDTM <= @CleanupOlderThanDate
EXEC sp_executesql @SQL, N'@Model_ID INT, @CleanupOlderThanDate DATE', @Model_ID, @CleanupOlderThanDate;
RETURN(0);
END TRY
--Compensate as necessary
BEGIN CATCH
-- Get error info
DECLARE
@ErrorMessage NVARCHAR(4000),
@ErrorSeverity INT,
@ErrorState INT;
EXEC mdm.udpGetErrorInfo
@ErrorMessage = @ErrorMessage OUTPUT,
@ErrorSeverity = @ErrorSeverity OUTPUT,
@ErrorState = @ErrorState OUTPUT;
RAISERROR(@ErrorMessage, @ErrorSeverity, @ErrorState);
--On error, return NULL results
--SELECT @Return_ID = NULL;
RETURN(1);
END CATCH;
SET NOCOUNT OFF
END --proc
GO