Hi.. I have applied for passport but people born aftr 1989 need to have date of birth certificate.but I was born in hometown in visakhapatnam and I don't have any records.how will I get my date of birth certificate?and where will I get it?

Hopefully your birth was registered by your parents at the registrar’s office in your home town.

You'll need to go to the registrar’s office and complete the forms they require to have a birth certificate issued.

I read this at:
Home: National Portal of India (http://india.gov.in/)