What’s a DACPAC and a BACPAC?

Another post for me that is simple and hopefully serves as an example for people trying to get blogging as #SQLNewBloggers.

If you’ve worked with SQL Server development and database projects, you might have heard about DACPACs. However, if you haven’t, this was a concept that didn’t seem to catch on with many companies. I’m not a fan of the format, but it works and you should be aware of what a DACPAC is and how it can be used.

The DAC part of the moniker is show for Data-tier Application.  This is the container that includes all of the object definitions for the objects that are contained inside of the DACPAC. The PAC part is just an easy way to note this is a contained in a compressed format.

In fact, the .DACPAC is a zip file. If I rename one of them, I can open is like any other zip file. Here’s one I’ve added a .zip to the end of and opened in Windows Explorer. There are a few files in here.

2017-02-21 14_30_31-PartsUnlimited.dacpac.zip

The only really important one is the model.xml, which is a model of my objects. If I look inside, it’s a cumbersome XML format, but I can easily see my Order table as a part of the file.

2017-02-21 14_25_38-Lab Setup.docx - Word

These are useful files for having a machine read the format and reproduce database objects in a live database. SQLPackage.exe will do this, as will other tools such as a the DacFX (Data-tier Application Framework).

I don’t love the format, but it is machine readable and can allow you to package and deploy database changes. There are limitations, especially between versions, and I think that it’s harder to understand than the formats that SQL Compare (From my company, Redgate Software) uses, but that’s me. I’m biased, but I don’t love DACPACs.

In any case, you can right click and “Unpack” this, or use SSMS to create and read them into a database. In the next post, I’ll show how that works.

What’s a BACPAC?

That’s easy. It’s a DACPAC with the data included.

About way0utwest

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1 Response to What’s a DACPAC and a BACPAC?

  1. Pingback: Create a DACPAC to Move Databases–#SQLNewBlogger | Voice of the DBA

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