Improve NHibernate startup time?

luedi · **Joined:** Tue Feb 21, 2006 9:50 am **Posts:** 107

Hello,

i'm working on an application which uses a database with around 100 tables. All tables of hte database are mapped via NHibernate. On application startup NHibernate needs around 20 seconds to build up his mapping.

First i thought that the enabled logging was responsible for the startup time, but this is not the fact. Disable logging brings only minor improvements in startup time.

I'm using the standard way of mapping suggested in the documentation (each class has it's own mapping file and the mappings are placed as embedded resources).

Our customer want's a fast and highly responsive UI so the startup time is inacceptable for him, so i'm looking for a solution to speed up the startup time of NHibernate.

I'm thinking about putting the initialization code for NHibernate in a background task. The applicaton shows some data from the database immediately after startup, so i have to implement additional control logic to ensure that the NHibernate startup is completed before i can read the data. If there is an alternate (and faster) way to init NHibernate i maybe can avoid this additional effort.

Regards
Klaus

martijnb · **Joined:** Sat May 14, 2005 8:40 am **Posts:** 130

Disable the reflection optimizer:

Code:

<nhibernate>
...
  <add key="hibernate.use_reflection_optimizer" value="false" />
</nhibernate>

luedi · **Joined:** Tue Feb 21, 2006 9:50 am **Posts:** 107

wow...

this causes an incredible decrease of startup time. The appllication is now up in less than a second.

Thanks for the tip.

Klaus

smudges · **Posted:** Mon May 08, 2006 4:35 pm

You should look at this post.

http://forum.hibernate.org/viewtopic.php?t=956966

luedi · **Joined:** Tue Feb 21, 2006 9:50 am **Posts:** 107

i have read this posting but unfortunately i have to develop the application in .NET 1.1.

Regards
Klaus