Solution : https://service.sap.com/sap/support/notes/515762 (SAP Service marketplace login required)
Key words :
solaris oracle 64-bit/general/3rdparty/oracle/solaris_64/8, related rollback segment increases, oracle fet$ internal table, oracle source code, shadow process requires, redo entries relating, oracle version 6, c_ts# table, terms loop, c_ts# i_ts#