Windows server locking issue on datafiles

Question

Hi,
We are having Oracle database (10.2.0.3) on Windows 2003 (R2 Standard Edition) server. We have database residing on the server, however, the issue is that the database is getting shutdown due to some errors. When we check the alert.log, we understand that some OS process is locking the database files due to which the database is getting shutdown every day around 3.15 - 3.45 am.
The error as per alert.log is as below;
Errors in file f:\oracle\product\10.2.0\admin\orclint\bdump\orclint_ckpt_7680.trc:
ORA-00206: error in writing (block 3, # blocks 1) of control file
ORA-00202: control file: 'F:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCLINT\CONTROL02.CTL'
ORA-27072: File I/O error
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 33) The process cannot access the file because another process has locked a portion of the file.
When we check the orclint_ckpt_7680.trc file, we have;
Dump file f:\oracle\product\10.2.0\admin\orclint\bdump\orclint_ckpt_7680.trc
Sat Nov 19 03:22:15 2011
ORACLE V10.2.0.3.0 - Production vsnsta=0
vsnsql=14 vsnxtr=3
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, OLAP and Data Mining options
Windows NT Version V5.2 Service Pack 2
CPU : 2 - type 586, 2 Physical Cores
Process Affinity : 0x00000000
Memory (Avail/Total): Ph:475M/2047M, Ph+PgF:934M/3434M, VA:1266M/2047M
Instance name: orclint
Redo thread mounted by this instance: 1
Oracle process number: 7
Windows thread id: 7680, image: ORACLE.EXE (CKPT)
*** 2011-11-19 03:22:15.440
*** SERVICE NAME:(SYS$BACKGROUND) 2011-11-19 03:22:15.409
*** SESSION ID:(165.1) 2011-11-19 03:22:15.409
ORA-00206: error in writing (block 3, # blocks 1) of control file
ORA-00202: control file: 'F:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCLINT\CONTROL02.CTL'
ORA-27072: File I/O error
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 33) The process cannot access the file because another process has locked a portion of the file.
error 221 detected in background process
ORA-00221: error on write to control file
ORA-00206: error in writing (block 3, # blocks 1) of control file
ORA-00202: control file: 'F:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCLINT\CONTROL02.CTL'
ORA-27072: File I/O error
OSD-04008: WriteFile() failure, unable to write to file
O/S-Error: (OS 33) The process cannot access the file because another process has locked a portion of the file.
We have disabled the Antivirus and checked, still the problem exists. We need additional help in identifying the OS process that might be locking the datafiles.Also, when we check the Windows Event Log, it shows nothing wrt the same.
Please help us with the issue.
Thanks,
Rahul

Answer 1

Try to use the handle tool http://technet.microsoft.com/en-us/sysinternals/bb896655 .
Example with Oracle XE on Windows 7 with administrator privileges:
c:\>handle.exe dbf | findstr  SYSTEM
oracle.exe         pid: 2420   type: File           73C: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           744: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: Section        758: \BaseNamedObjects\C:_ORACLEXE_APP_ORACLE_ORADATA_XE_SYSTEM.DBF
oracle.exe         pid: 2420   type: File           81C: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           820: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           844: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           848: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           8BC: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           8C0: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           8F0: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           8F4: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           9AC: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           9B0: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           A18: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           A1C: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           A9C: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           AA0: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           AD8: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF
oracle.exe         pid: 2420   type: File           ADC: C:\oraclexe\app\oracle\oradata\XE\SYSTEM.DBF