T-SQL Tuesday #152 – Rants

Thanks to Deborah for hosting July month of T-SQL Tuesday!

I would like to share a rant on a situation I faced working on the database Server migrations couple of years ago.

In the past few years, I have done several database and server migrations. As you know, there are many things that needs to be taken care of during the testing phase until we do the actual migrations.

It is not simply the database that we migrate but all the related objects needs to be migrated as well. The agent jobs, SSIS packages, linked servers and most importantly updating the connections to the datasource information, not only to the database related objects but also to the related applications.

If you are using the Servername and database name in the connection strings in all the applications connecting to your database being migrated, this process gets tough and tedious to update once the database is migrated to a different server. It is always advised to use database DNS in the connection strings instead of the IP address or the Servername.

This also applies to the report server datasources as well.

I know it is hard to make the change but if the change is good, it is worth the effort.

During several database Server migrations, I have seen developers feeling comfortable in changing their application code to the new Server name instead of taking the advice of database DNS. I know the amount of work that goes behind to find the objects referencing the server names. Missing any one of the locations can absolutely break the code and mess really hard.

I have experienced many times where developers had failed updating the SSIS packages or failed Linked Server connections once the databases are migrated. This problem can be solved simply by using the database DNS instead of the Server name. You will be only updating the DNS entry pointing to the new server name once you migrate the database to point to the new Server environment.

I know many companies already follow the standards of using database DNS but there are still others out there doesn’t want to make the change and instead fix the problem when applications break.

I believe it is not only important to fix a broken application somehow but how effectively and simply you can avoid causing the applications to break in the first place.

I am very interested in reading other SQL family member posts on this topic!

Thanks for reading!

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