SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


Lazy Spool - How can i improve/avoid this?


Lazy Spool - How can i improve/avoid this?

Author
Message
curious_sqldba
curious_sqldba
Hall of Fame
Hall of Fame (3.6K reputation)Hall of Fame (3.6K reputation)Hall of Fame (3.6K reputation)Hall of Fame (3.6K reputation)Hall of Fame (3.6K reputation)Hall of Fame (3.6K reputation)Hall of Fame (3.6K reputation)Hall of Fame (3.6K reputation)

Group: General Forum Members
Points: 3628 Visits: 3655
About 75 percent of cost is being used by "Table Spool(Lazy Spool)" in the execution plan. The inputs on this operator are from an clustered index scan(cost is 0%) and a index seek(cost is 0%) from the same table with actual rows return 0 for each. I did do some research on lazy spool and seems like it is creating a temp table on temp db but why is the cost 75% when 0 records are fed as inputs?
jswong05
jswong05
Old Hand
Old Hand (357 reputation)Old Hand (357 reputation)Old Hand (357 reputation)Old Hand (357 reputation)Old Hand (357 reputation)Old Hand (357 reputation)Old Hand (357 reputation)Old Hand (357 reputation)

Group: General Forum Members
Points: 357 Visits: 476
Check if you have appropriate indexes.

Jason
http://dbace.us
:-P
GilaMonster
GilaMonster
SSC Guru
SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)SSC Guru (114K reputation)

Group: General Forum Members
Points: 114187 Visits: 45475
Query, table definitions, index definitions and execution plan please.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

We walk in the dark places no others will enter
We stand on the bridge and no one may pass


Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search