# Connecting to DB2 instance on the mainframe

**URL:** <https://forums.toadworld.com/t/connecting-to-db2-instance-on-the-mainframe/7992>\
**Category:** Toad for IBM DB2\
**Created:** [August 23, 2011, 6:28pm UTC](https://forums.toadworld.com/t/connecting-to-db2-instance-on-the-mainframe/7992 "2011-08-23T18:28:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mohinder](https://avatars.discourse-cdn.com/v4/letter/m/aca169/32.png) [@Mohinder](https://forums.toadworld.com/u/Mohinder)\
**Post date:** [August 23, 2011, 6:28pm UTC](https://forums.toadworld.com/t/connecting-to-db2-instance-on-the-mainframe/7992/1 "2011-08-23T18:28:00Z")

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I am a newbie. So please bear with me.

I have installed toad 4.7.1.638. We have an enterprise Licence.  
I beleive I installed the ZOS version but I may be mistaken which brings me to the first question

1. Is there a way to verify that I have the ZOS version installed?

For the rest of the questions I will assume that I do have the ZOS version installed  
2. What information would I need to set up the connection to the DB2 Instance?  
3. I will be creating a front end (GUI) application using Visual Studio. What do I need to set up a connection string so that my application can talk to the DB2 database?  
Thank you in advance for your support.

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**Author:** ![Mohinder](https://avatars.discourse-cdn.com/v4/letter/m/aca169/32.png) [@Mohinder](https://forums.toadworld.com/u/Mohinder)\
**Post date:** [August 23, 2011, 6:42pm UTC](https://forums.toadworld.com/t/connecting-to-db2-instance-on-the-mainframe/7992/2 "2011-08-23T18:42:05Z")

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BTW I just figured out that the version I installed is the “LUW Professional” version.

So does that mean I will need to download and install the Z/OS upgrade? Will that invalidate my license?

Thanks Again

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**Author:** ![Jeff\_Podlasek](https://sea1.discourse-cdn.com/quest/user_avatar/forums.toadworld.com/jeff_podlasek/32/29_2.png) [@Jeff\_Podlasek](https://forums.toadworld.com/u/Jeff_Podlasek)\
**Post date:** [August 24, 2011, 9:04am UTC](https://forums.toadworld.com/t/connecting-to-db2-instance-on-the-mainframe/7992/3 "2011-08-24T09:04:52Z")

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Mohinder,  
When you install Toad for DB2, support for both DB2 LUW and DB2 on z/OS is installed. The specific license that you or your organization purchased controls whether you have access to DB2 LUW, DB2 z/OS (or both).  
From what I gather, your organization purchased a DB2 LUW Professional License.  
If you want to gain access to DB2 on z/OS within Toad, you will need to purchase a Toad for DB2 on z/OS product. That will come with a separate Toad DB2 z/OS license. Once you have done that, you do not need to download or reinstall Toad DB2 4.7.1.638, but you will just need to add the new Toad DB2 z/OS license (by selecting Help | Licensing from the main menu in Toad) within your already installed 4.7.1.638 version of Toad DB2.  
Hope this helps,  
Jeff