Caida de la DB

Hola
Se me presento dos caídas seguidas de la DB que me genero los siguientes .trc., pero  la DB subió normal, pero quisiera saber como puedo averiguar la causa de las misma para evitar que vuelva a suceder.
Gracias
traza 1:
/oradata1/admin/produc/udump/produc_ora_7743.trc
Oracle9i Release 9.2.0.7.0 - Production
JServer Release 9.2.0.7.0 - Production
ORACLE_HOME = /u01/oracle/product/9i
System name: Linux
Node name: produc.orga.gov.co
Release: 2.6.9-34.ELsmp
Version: #1 SMP Fri Feb 24 16:54:53 EST 2006
Machine: i686
Instance name: produc
Redo thread mounted by this instance: 1
Oracle process number: 13
Unix process pid: 7743, image: oracle@produc. Orga.gov.co (TNS V1-V3)
*** SESSION ID:(10.1) 2008-09-15 10:41:19.347
Thread checkpoint rba:0x001953.00000002.0010 scn:0x0000.3853a4e1
On-disk rba:0x001953.00009858.0000 scn:0x0000.3853b2e1
Use incremental checkpoint cache-low RBA
Thread 1 recovery from rba:0x001953.00000003.0000 scn:0x0000.00000000
*** 2008-09-15 10:41:19.466
Recovery of Online Redo Log: Thread 1 Group 2 Seq 6483 Reading mem 0
traza 2
/oradata1/admin/produc/udump/produc_ora_9062.trc
Oracle9i Release 9.2.0.7.0 - Production
JServer Release 9.2.0.7.0 - Production
ORACLE_HOME = /u01/oracle/product/9i
System name: Linux
Node name: produc.orga.gov.co
Release: 2.6.9-34.ELsmp
Version: #1 SMP Fri Feb 24 16:54:53 EST 2006
Machine: i686
Instance name: produc
Redo thread mounted by this instance: 1
Oracle process number: 13
Unix process pid: 9062, image: [email protected] (TNS V1-V3)
*** SESSION ID:(10.3) 2008-09-15 10:34:59.498
Thread checkpoint rba:0x001951.00000002.0010 scn:0x0000.38528610
On-disk rba:0x001952.00006b6b.0000 scn:0x0000.385356bf
Use incremental checkpoint cache-low RBA
Thread 1 recovery from rba:0x001951.00022409.0000 scn:0x0000.00000000
*** 2008-09-15 10:34:59.617
Recovery of Online Redo Log: Thread 1 Group 3 Seq 6481 Reading mem 0
*** 2008-09-15 10:35:12.039
Recovery of Online Redo Log: Thread 1 Group 1 Seq 6482 Reading mem 0