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shawnhenson avatar image
shawnhenson asked

Export & remove data then re-access later

Is there a way to take a database, have it export say 3 years of data into its own database. Then remove those 3 years of data from the current to reduce the size? Then lets say If I needed to get to the data from that 3 years, Is there a way to temporarily connect to the 3 year database?
databaseexport-datasystem-databasesexportdata-export
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If I was faced with this task, I'd want to consider things like: How big is the database? How fast is it growing? How many tables and rows in those tables are going to be affected? What happens if you remove a row that is referenced by a different table's foreign key? Are you doing this because of a shortage of disk space or are you trying to improve performance? Is table partitioning and row compression another option?
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JohnM avatar image
JohnM answered
There are a multitude of ways to accomplish this. For example, you could use SSIS to loop through all of the tables and move the data; you could use native TSQL to do the same with a cross database join, or possibly you could use a backup/restore strategy. Each solution will require some up front work and design but all are pretty reliable. This isn't going to be a simple switch type of solution that will do the work for you behind the scenes. Once the data is in the archive location, you would most likely have to use a cross database join to query that data in relation to the "active" data. There can be some gotcha's with this, but certainly doable. Hope this helps!
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Venkataraman answered
Let us assume you have got dbo.TableA in DatabaseA and history column is CreatedDate. 1. First create a new database DatabaseB 2. Load data into TableA of DatabaseB with filter applied as per script below. 3. Repeat the step 2 for other tables DECLARE @HistoricalFilterStartDate datetime, @HistoricalFilterEndDate datetime SET @HistoricalFilterStartDate = -- Specify historical Start value for filter SET @HistoricalFilterEndDate = -- Specify historical End value for filter SELECT * INTO DatabaseB.dbo.TableA FROM DatabaseA.dbo.TableA WHERE CreatedDate > @HistoricalFilterStartDate AND CreatedDate < @HistoricalFilterEndDate
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