Comments on: db4o Performance Pitfalls

By: Christoph Menge

Christoph Menge — Sun, 14 Mar 2010 17:49:44 +0000

In my case, yes. Native query optimization in db4o depends on those dlls – if the .dlls are missing, optimization won’t work.

However, there are many reasons why the optimization could still fail. Mostly this happens because people call methods that can’t be optimized.

The current optimizer supports only a small subset of what LINQ to objects supports. Complicated string operations won’t be optimized either. See http://developer.db4o.com/Documentation/Reference/db4o-7.12/net35/reference/html/reference/tuning/native_query_optimization.html for details and a list of supported operations.

By: Benny

Benny — Sun, 14 Mar 2010 17:39:44 +0000

For this optimizer to work, just put those dll? no code change required?

By: siaqodb_user

siaqodb_user — Sun, 28 Feb 2010 23:13:12 +0000

Christoph,
Indeed siaqodb is commercial, but as you said: “On the other hand, for a commercial project I’d stick to a solution that has some history and a strong community.” this means you need also to buy license for db4o because for commercial projects db4o is not free.
Is also true that siaqodb is not lauched too long time ago, but already has a lot of interests from developers and speacially from Silverlight developers because LINQ is supported by siaqodb on Silverlight and has small footprint which is very important because user need to download small .XAP file.

By: Christoph Menge

Christoph Menge — Fri, 26 Feb 2010 14:38:59 +0000

Thanks for the comment. I think it’s good to see more innovative solutions approaching data storage come up.

What I posted is not entirely specific to db4o: calling a lambda expression will require object instantiation, while parsing the expression tree does not. The latter is obviously much faster, but also more complicated. db4o’s support for it is quite good, however – as long as you don’t leave out the required libraries.

siaqodb sure looks interesting because it has a very small footprint. On the other hand, for a commercial project I’d stick to a solution that has some history and a strong community.

Also, siaqodb is not open source which would help to build the required amount of trust, especially in the beginning where community support will not be strong.

By: siaqodb_user

siaqodb_user — Thu, 25 Feb 2010 20:50:07 +0000

You can also try siaqodb ( http://siaqodb.com ). Has also very fast LINQ queries and in plus support LINQ on Silverlight