Schema on Db2 database installed on Main frame machine zOS.

Hi ,

I would like to know :
1.how to find all the schema in my DB2 database on Main frame
machine .
2. How to see all the tables for a given schema .
3. What are the default schema in Db2 on Mainframe . zOS.


I know all the above when I connect to DB2 on LUW ..
1. db2 select schemaname from syscat.schemata
2. db2 list tables for schema <schema name >
3. The defauult are  SYSIBM SYCAT , SYSCAT  . SYSFUN .

Can u please help me ...as I am connecting to  the ZOS Db2 database
for the first time ,..and all the query fails .

Thanks a lot .
Bikash Karan