New Article – How expensive are column-side Implicit Conversions?

Last week I blogged about Implicit Conversions that cause Index Scans, and showed two charts for where implicit conversions could result in an index scan operation instead of an index seek during query execution.  As a part of writing that blog post I thought it would be interesting to also look at the performance overhead […]

Implicit Conversions that cause Index Scans

Implicit conversions seem to be a growing trend in the SQL Server performance tuning work that I’ve been engaged in recently, and I’ve blogged in the past about ways to identify when implicit conversions are occurring using the plan cache. For those of you who don’t know, implicit conversions occur whenever data with two different […]

Finding Key Lookups inside the Plan Cache

This is actually a blog post I thought I’d written more than two years ago, but this morning when I went looking for it after receiving a question by email  I realized that I’ve never blogged about this before.  At PASS Summit 2010 I presented a session on performance tuning SQL Server by digging into […]