hi please help me to know about the db2 udb dba activities in real time scenarios there is any prerquisites to learn the db2 udb dba v9.7

http://www.ibm.com/developerworks/data/library/techarticle/dm-0404snow/index.html

http://www.ibm.com/developerworks/data/library/techarticle/dm-0509poon/

http://www.ibm.com/developerworks/data/library/techarticle/dm-0404mcarthur/

http://www.selectorweb.com/db2.html

http://publib.boulder.ibm.com/infocenter/db2luw/v9r5/index.jsp?topic=/com.ibm.db2.luw.qb.server.doc/doc/r0024443.html

http://www.ibm.com/developerworks/data/library/techarticle/dm-0406qi/

When Am Taking Online Back up connection to the database is disconnecting. As per knowledge when we taking the online backup the users or Applications can connect to the database but what is the solution for the above situation. This is when am practicing on the express-c software.