As far as the exam goes, there is no specific order. it can be done any way you want. however the preferred route is

SQL - (1Z0-007) + DB-Funda I (1Z0-031) = OCA
OCA + DB-Fuuda II (1Z0-032) + P.T. (1Z0-033) = OCP :>

This is the route that i have taken. I have completed OCA and I'm now working towards OCP. I feel more confident now that I have the OCA and there's definately no pressure.

Cheers.