What are the disadvantges in executing .net assembly in SQL Server ?

Is it a good practice to execute the .net  assembly through SQL server ?
Varshini SAsked:
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Jacques Bourgeois (James Burger)PresidentCommented:
They are slower than straight SQL.

Their role is not to replace SQL, they are there to provide a way to perform operations that cannot be done or are hard to do from SQL, such as Office interop.
Kyle AbrahamsSenior .Net DeveloperCommented:
Also it depends on if you own the DLL or not.  If you don't own the DLL (eg: you didn't compile the source to generate that DLL) you're trusting the user who provided the DLL that it's going to do what they say it will do.

There are ways around that (eg: de-compiling to verify) but it's a disadvantage in my mind.

Also to elaborate on why they are slower the DB has to load the dll into memory, then invoke the function in the CLR.  It also doesn't perform any kind of performance tuning or optimizations.

Lastly RAM usage could be another disadvantage (eg: the assembly will take up RAM space).
Éric MoreauSenior .Net ConsultantCommented:
Kyle AbrahamsSenior .Net DeveloperCommented:
Eric . . . where do you cover the advantages / disadvantages?
Éric MoreauSenior .Net ConsultantCommented:
I don't have a section specific for pros/cons. I warn that SQL statements will always be faster then your CLR code.

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