When Creating Domain for Oracle SOA it’s Mandatory to Run Oracle RCU before to create SOA Repository, This will create tables configuration and information about Oracle SOA.
But What happened the this tablespace was getting full, increase it 20GB is not enough which mean it’s strange case and not acceptable.
after investigation Table Called “REFERENCE_INSTANCE” include information about Running Composite in SOA ans instances. the size for this table 18GB.
Select * from Reference_instance;
Check the data in the above query, just in case you can use export data-bump utility for this table, however after this Truncate the table and from full tablespace toonly 2% usage.
Thank you
Osama Mustafa
Technology Geek 