http://www.nhforge.org/doc/nh/en/index.html#performance-collections-oneshotdelete


-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of 
Dzyann
Sent: den 1 april 2011 23:23
To: nhusers
Subject: [nhusers] Delete Cascade taking a long time

Hi,

I have a an entity Query that has a lot of items Metadata in a relation 
"one-to-many".
When I delete the Query, I want all its childs to be delete too, so I set 
cascade to all-delete-orphan.

The items get deleted, but it takes a lot of time. The query can have many 
items, lets say 95k items.
I checked out with the SQL Profiler to see what was going on, and I saw that 
each Metadata Item is getting deleted one by one like:

exec sp_executesql N'DELETE FROM MyDatabase.dbo.[QueryMetadata] WHERE Id = 
@p0',N'@p0 int',@p0=302401

This takes time, and produces a bad user experience. I would like to hear out 
any recommendations.
Maybe is better if I delete the items with a sql sentence?

Thanks in advance for your help!

Dzy.-

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