Hi Jonu,
You can get info of all column tables and their memory utilization from M_CS_TABLES View
You can get info of all row tables and their memory utilization from M_RS_TABLES View
To find all tables for a particular schema, just filter that schema
SELECT * FROM "SYS"."M_CS_TABLES" WHERE SCHEMA_NAME = '<YOURSCHEMANAME>'
These Monitoring views are present in SYS schema
Regards,
Vivek