Hi Subhas,
There are two nice documentation from SAP that can help you understanding in detail on what you are asking.
http://maxdb.sap.com/training/administration_7.6/MaxDB-Admin-All.pdf
Let me know if they are helpful.
If you still have issues to startup SAP, share the dev_w0 and dev_ms log here. Thanks.
Regards,
Sujit Kumar Banerjee