Hello midhunjose,
I would like to inform you that using Oracle Express Edition(XE) for HP ALM 11.50 s not a good choice.
The reason for that are too many limitations that Oracle XE has.
There are CPU, RAM, User data and other limitations which can cause problem in the normal work of HP ALM 11.50.
We recommend you to use Oracle Standard Edition at least.
Currently supported versions of Oracle are:
Oracle 10.2.0.5
Oracle 11.2.0.3
All of the HP ALM 11.50 System Requirements you can find on the following URL:
https://hpln.hp.com/page/alm-qc-enterprise-technical-specifications
I hope this helps.