SQL Server 2017 Cumulative Update 4

On February 20, 2018, Microsoft released SQL Server 2017 Cumulative Update 4, which is Build 14.0.3022.28. I count 55 hotfixes in the public fix list. There is a special T-SQL script in the release notes that you need to run if you are using Query Store and previously ever had SQL Server 2017 CU2 installed (and you were using Query Store on any of your databases at that time). The script will look for any plans that were forced while you were running SQL Server 2017 CU2, and if it finds any, it will unforce them, and then clear them from Query Store.

There are also quite a few updates for Columnstore indexes and for Availability Groups. Remember, there are not going to be any Service Packs for SQL Server 2017, so you are going to want to test and deploy SQL Server 2017 Cumulative Updates as they become available.

As always, I think it is a good idea to make an effort to stay current on Cumulative Updates, as does Microsoft.

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