CHECKDB’s Hidden Snapshot

I am in the middle of some research regarding CHECKDB and learnt something new. From SQL Server 2014 onwards the database snapshot that is used to get to a transactionally-consistent point-in-time is no longer hidden.

To understand the behavior prior to 2014 I am going to quote Paul Randal here – he states “ As the database snapshot is hidden, there is no control over where the snapshot files are placed – in fact they are created as alternate streams of the files comprising the source database” (http://www.sqlskills.com/blogs/paul/checkdb-from-every-angle-complete-description-of-all-checkdb-stages/)

In SQL Server 2014 things have changed – it is not hidden and it doesn’t use alternate streams.

DBCC CHECKDB ('Newdb')

Checking the location where the data files reside we can see the snapshot.

checkme.JPG

This disappears once CHECKDB finishes.

 

1 thought on “CHECKDB’s Hidden Snapshot

  1. Pingback: CHECKDB Snapshots – Curated SQL

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s