Hi !!
I need to store big xmls in a db and query them.
The relational model would require myriad of tables and joins
So i guess , i'll have to choose between a document oriented or a xml oriented db.

I have been going through the mongo model and pure XML db.
Which one would be a better option ?
I don't have much of an idea about these.

Thanks

What is the purpose of the 'big xmls' ?

IF you were to completely parse the xml data and store each element in separate tables, then, yes, it would take a lot of work. However, most modern relational databases support xml field types, so, you can often add key identifying fields and store the XML in a table.

hii

We have like 4K tags , so storing them into tables doesn't sound like a good idea.Also, mostly need to query the xmls based on tags.

DB2 (I think others as well) has a built-in xml engine that let's you combine xpath/xquery with sql or run them as is. Don't know whether it will suit your needs, but here's a link to some samples:

IBM DB2 9.5 Information Center for Linux, UNIX, and Windows