Manual Database Testing:
every application will have an user interface page to enter 
the data.
Actually what we enter the data in front end will be stored
in the back end database.
In this process od database testing we will enter some test 
data from front end.
We will check the data stored in to the database with the 
test data which we entered from the front end.

If the database is working fine then the data entered from 
the front end must be same as the data present in the 
database.

To start actual database testing testers normally login in 
to database using User name and password.

More than this we should check the database constarints of 
the database like
  i.  Check constrain
  ii. Primary key constrain
  iii.Forign key constrain(Referential integrity constain)
  iv. Unique contrain
  v.  Not Null constratins must be tested for the given
      database.
LEKAGE:When large volumes of data is inserted in to database
database cannot retain the data in the database.
this condition is called as database lekage.

In QTP we use data driven feature for storing large amount 
of data i to database.

Byee

rajendra 
rajendra_penumalli@yahoo.com
9885162742