tl;dr Planned service interruption that will impact all Stack Exchange sites, Jobs, and Chat. All sites may be read-only for up to 2 hours on Saturday, February 19, 2022 at 2:00AM UTC (Friday, February 18, 2022 at 9:00PM US/ET). On-premises Enterprise instances will not be affected.

Short Version

There will be a service degradation for up to 2 hours on Saturday, February 19, 2022 at 2:00AM UTC (Friday, February 18, 2022 at 9:00PM EST). During that time, questions and answers will still display, job listings will still work, and job ads will still display. However, the site will be "read only," i.e. people won't be able to add/edit new job listings, apply for jobs, post, edit, or vote on questions/comments/answers; reputation won't change, etc. This should minimize the disruption to the majority of casual readers. We will display a banner on the sites stating we're read-only for maintenance.

Longer Version

What we’ll be doing

SQL Server has a large number of features which can interact in surprising ways. In this case, the sparse columns feature prevents us from adding new non-null columns with a default value as an online, metadata-only change. We are removing sparse columns from some tables to make changes easier without further outages.

We expect that the site will be in a read-only state for less than two hours in total. Once we have made our changes and everything seems to be up and running, we’ll restore functionality.

Questions or concerns?

Please post a comment or answer below; we’ll do our best to answer any concerns between now and the maintenance window.

  • 45
    I like that you have a tl;dr, a short version, and a long version, all of which are about the same length
    – Cullub
    Commented Feb 7, 2022 at 21:50
  • 7
    @Cullub Maybe they build up -- so you have to read the "tl;dr" first before you get the rest ;)
    – NerdOnTour
    Commented Feb 8, 2022 at 16:09
  • 17
    Hah! Truthfully, it's a template and I just put the words in the template. Commented Feb 8, 2022 at 19:49
  • 4
    With your hands?!
    – Braiam
    Commented Feb 10, 2022 at 14:44

1 Answer 1


Migration complete

On February 18, 2022 at 9:41 PM EST US (February 19, 2022 at 2:41 AM UTC), we completed migration and returned the site to read-write mode. Thanks for your patience!


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