Hi ,
thanks for the reply.here is the trace file .

/app/oracle/admin/SOFPDWB4/udump/sofpdwb4_ora_1769540.trc
Oracle9i Enterprise Edition Release 9.2.0.5.0 - 64bit Production
With the Partitioning and Oracle Data Mining options
JServer Release 9.2.0.5.0 - Production
ORACLE_HOME = /app/oracle/product/9.2.0
System name: AIX
Node name: sof016
Release: 1
Version: 5
Machine: 000CEF9C4C00
Instance name: SOFPDWB4
Redo thread mounted by this instance: 1
Oracle process number: 25
Unix process pid: 1769540, image: oracle@sof016 (TNS V1-V3)

*** 2006-03-09 02:14:13.311
*** SESSION ID:(53.5721) 2006-03-09 02:14:13.310
ORA-27037: unable to obtain file status
IBM AIX RISC System/6000 Error: 2: No such file or directory
Additional information: 4