Hello Shruthi,
Are you planning to change the passwords of the MAXDB database users?
If yes =>
A)
MAXDB library:
http://maxdb.sap.com/doc/7_8/default.htm ->
Database Studio -> Managing Users: Overview
B)
If you are SAP customer => Review SAP Note No. 25591
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What is the version of your database?
What is the type of your database?
What is the version of the DB studio installed on your machine?
Are you planning to change the password of dbm < database operator, default SAP installation - control >, SYSDBA or DBA database user ?
Regards, Natalia khlopina