SQL Server 2017 CU21 Released

SQL Server 2017 CU21

On July 1, 2020, Microsoft released SQL Server 2017 Cumulative Update 21. This is Build 14.0.3335.1 By my count, there are 34 public hotfixes in SQL Server 2017 CU21, which is about an average number.

SQL Server 2017 CU21 Released
SQL Server Support End Dates

No Service Packs

SQL Server 2017 and newer does not have Service Packs. Microsoft is not using Service Packs as a servicing mechanism for SQL Server, only cumulative updates.

SQL Server 2017 CU21 was released on July 1, 2020. Due to human malware concerns, CU21 was delayed until July 1, 2020. Normally, Microsoft will release a new SQL Server 2017 CU every two months. This is what they will do until SQL Server 2017 falls out of Mainstream Support on October 11, 2022. When SQL Server 2017 falls out of Mainstream Support, there won’t be anymore cumulative updates.

Final Words

SQL Server cumulative updates are actually cumulative, which might seem obvious from the name. This means that when you install SQL Server 2017 CU21, you are going to get all of the hotfixes and product improvements from ALL of the previous CUs. Microsoft has fixed hundreds of bugs since SQL Server 2017 RTM, and they have also added a significant number of product improvements and new features since the RTM release.

Despite some recent stumbles by Microsoft, I am still a big proponent of trying to keep your SQL Server instances as up to date as possible. That does not mean throwing a new CU into Production the day it is released, but it also does not mean avoiding patching SQL Server indefinitely either. You really are better off trying to stay as current as possible on your SQL Server builds.

Here is Microsoft’s official guidance:

Microsoft recommends ongoing, proactive installation of CUs as they become available

  • SQL Server CUs are certified to the same levels as Service Packs, and should be installed at the same level of confidence.
  • Historical data shows that a significant number of support cases involve an issue that has already been addressed in a released CU.
  • CUs may contain added value over and above hotfixes. This includes supportability, manageability, and reliability updates.

If you have any questions about this post, please ask me here in the comments or on Twitter. I am pretty active on Twitter as GlennAlanBerry. Thanks for reading!

Categories SQL Server, SQL Server 2017Tags ,

2 thoughts on “SQL Server 2017 CU21 Released

  1. Michael A Dean July 8, 2020 — 6:47 am

    Hi Glenn,
    Your blog has SQL 2017 coming out of Mainstream Support on October 11, 2020; but the year should be 2022.

    Michael Dean

    1. Thanks for pointing that out! I have fixed that typo now.

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