Comments on: A Bookmark lookup, by any other name…

By: Gail

Gail — Fri, 19 Jun 2009 09:16:43 +0000

Sure, tuning this involves widening the index so that it covers the query.

By: pedro

pedro — Thu, 18 Jun 2009 17:26:11 +0000

bottom line question if this is 97% of a cost in a query can it be better tuned?

By: Peso

Peso — Fri, 13 Feb 2009 09:24:10 +0000

I vote for Key Lookup.
Not only for the deprecation of SQL Server 2000, but because that’s what all Lookups really are. They use a key to re-read a table and the matching values stored by keys in a worktable in TempDB.

By: Michelle Ufford

Michelle Ufford — Wed, 28 Jan 2009 15:50:22 +0000

Great post. I vote for bookmark look-up.

By: Christopher Stobbs

Christopher Stobbs — Wed, 28 Jan 2009 15:15:07 +0000

ooops I have a feeling this blog post may have been a result of my confusion thanks for the clearing it up for me the other day. I think bookmark look-up is accepted

By: Jack D Corbett

Jack D Corbett — Wed, 28 Jan 2009 02:27:34 +0000

I still call it a bookmark lookup, but I think you need to explain what MS calls it in each version for your audience to understand it.

By: Jonathan Kehayias

Jonathan Kehayias — Tue, 27 Jan 2009 20:22:05 +0000

I think Bookmark Lookup is still applicable because it encompasses the Key Lookup and the RID Lookup under one umbrella term. The both do similar things and have an impact on performance and potential deadlocking in the database.

By: Gail

Gail — Tue, 27 Jan 2009 17:54:11 +0000

I realised that I’ve been doing the same thing, both when I present, on blog posts and on forum replies.

Didn’t help at all that last time I presented, I showed an execution plan and started talking about the key lookups, then realised (after several people in the audience looked confused) that my demo machine was SQL 2005 RTM and the exec plan clearly showed a clustered index seek.

By: Grant

Grant — Tue, 27 Jan 2009 17:41:25 +0000

I’ve been trying, not entirely successfully, to use Key Lookup when referring to… that thing… that’s not a bookmark lookup. I presented on Saturday and vacillated between the two terms so much I’m sure I confused people.