Hi All,
I'm looking at a performance problem, a proc which gets called with some set of date parameters to delete data from a table, on a particular day one takes quite some time whilst the next day it takes a ridiculous amout of time. I have the execution plan for both, and what I can see is that the plan looks very similar, the only difference is that one has a clustered index delete which has a higher level of percentage compared to the execution plan for the day when it ran fine.
Clustered index delete was 72% of time estimate costings on when it took excessively longer, and the day when it didnt the clustered index delete was only about 10%.
The stats estimate on both of them were not very accurate, so thats not a main difference.
Any ideas here ?
