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Dynamics 365 Community / Forums / Microsoft Dynamics AX (Archived) / SQL Backup very LARGE ...
Microsoft Dynamics AX (Archived)

SQL Backup very LARGE (all of a sudden)

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Posted on by new_axys 135

Hi All,


so to move updates from my DEV Env to the TEST Env, i simply backup the SQL Database and restore in TEST. Working easy and quick.

(i have to move the .bak from one Location to another via internet/vpn tunnel)

So far the Backup file was around 120 MB , fairly small and quick to transfer.

All of a Sudden the Backup File has a whapping 3.5 GB , and i mean from last week to today. I am not talking about Modelstore, i am talking the Table Database.

This makes transfering data much harder, what happened ? Can anyone help please?

I did export the modelstore in a seperate step before hand. But this wasnt the first time i did this.

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  • Martin Dráb Profile Picture
    Martin Dráb 237,967 Most Valuable Professional on at

    You have to collect more information. Fist of all, connect to your DB server in SQL Server Management Studio, right click your database and choose Reports > Standard reports > Disk usage. This will give you a quick overview of what consumes space (data, unallocated space and so on). Depending on your findings, you can try other reports (such as Disk Usage by Table) and queries to find more details.

  • new_axys Profile Picture
    new_axys 135 on at

    so it turns out, dbo.XREFERENCES reserves 6.9 GB (2.4 BG of Data), dbo.XREFPATHS reserves 1.4 GB (the 3.5 BG i was mentioning in the thread is already the zipped file).

    Is it possible the Developer (who is currently working on some modifications) somehow blew up those tables ?

  • Verified answer
    Martin Dráb Profile Picture
    Martin Dráb 237,967 Most Valuable Professional on at

    These tables contains cross-references between all objects (fields, method calls etc.), therefore yes, it has something to do with developers. I don't know what's the usual size of these tables (I don't have any AX 2012 on hand), but it's true that they contain a lot of records.

    On the other hand, if it's a development box, you can't just tell developers stop using cross-references. It would be like cutting off one of their hands. :) If it's not a dev box, nobody should be doing any modifications there.

    Note that indexes of xRef* tables are often horribly fragmented, which wastes disk space. If it's the case, you can get some space by defragmenting them.

  • new_axys Profile Picture
    new_axys 135 on at

    Okay, thanks. That would explain the whole thing.

    Now there should be a solution to how to back up without the cross-references. i shall look that up. thanks Martin.

  • Suggested answer
    Vilmos Kintera Profile Picture
    Vilmos Kintera 46,149 on at

    You could move those tables to a separate filegroup in SQL Server, only back up the PRIMARY filegroup and log file, to be shipped between environments.

  • Suggested answer
    guk1964 Profile Picture
    guk1964 10,888 on at

    This is a very interesting thread I recommend also see this trail https://community.dynamics.com/ax/f/33/t/137796

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