What is restarting my ora processes after a crash ?

Hey,
my standby database crashed from time to time.
It looks like an fragmentation error in the SHARED_POOL_SIZE parameter. ORA-04031 comes up.
But my questions is:
At 03:15 a backup job via RMAN is starting.
Looks like that RMAN is responsible for this crash.
But at soon as RMAN recon that oracle is not available, all oracle processes are restarted.
BUT HOW DOES THE RESTART ?
Then the next question.
After the crash, mrp is not restarted by this 'automatic' process.
Could it be, that RMAN sets the database in backup mode - disables mrp - crashes - and the last status was, that mrp was not active ? So the redoApply is starting again ?
Backup.log
channel ORA_DISK_3: starting piece 1 at 18-FEB-10
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00601: fatal error in recovery manager
RMAN-03004: fatal error during execution of command
ORA-01092: ORACLE instance terminated. Disconnection forced
ORACLE error from target database:
ORA-03114: not connected to ORACLE
alert.log
Thu Feb 18 03:15:44 2010
Errors in file /opt/oracle/admin/TESTB/bdump/testb1_asmb_17361.trc:
ORA-04031: unable to allocate 3912 bytes of shared memory ("shared pool","unknown object","sga heap(1
,1)","ASM extent pointer array")
Thu Feb 18 03:15:44 2010
ASMB: terminating instance due to error 4031
Thu Feb 18 03:15:45 2010
System state dump is made for local instance
System State dumped to trace file /opt/oracle/admin/TESTB/bdump/testb1_diag_17216.trc
Thu Feb 18 03:15:46 2010
Shutting down instance (abort)
testb1_diag_23770.trc
opt/oracle/admin/TESTB/bdump/testb1_diag_23770.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, OLAP, Data Mining
and Real Application Testing options
ORACLE_HOME = /opt/oracle/product/10.2.0/db_1
System name: Linux
Node name: testb1
Release: 2.6.5-7.244-smp
Version: #1 SMP Mon Dec 12 18:32:25 UTC 2005
Machine: x86_64
Instance name: testb1
Redo thread mounted by this instance: 0 <none>
Oracle process number: 3
Unix process pid: 23770, image: oracle@testb1 (DIAG)
*** SERVICE NAME:() 2010-02-18 03:15:56.450
*** SESSION ID:(2204.1) 2010-02-18 03:15:56.450
kjzcprt:rcv port created
Node id: 0
List of nodes: 0, 1, 2,
*** 2010-02-18 03:15:56.451
Reconfiguration starts [incarn=0]
*** 2010-02-18 03:15:56.451
I'm the master node
A rcfg proposal from node 1 is received
A rcfg proposal from node 2 is received
*** 2010-02-18 03:15:57.478
Reconfiguration completes [incarn=7]
DIAG attached to DLM

Let me guess: You have a RAC standby database but you maintain it without Data Guard Broker. The clusterware on the node (precisely: crsd background process, belonging to the clusterware) where the instance crashed restarts the instance. Because there is no DMON (no Data Guard Broker configured), the MRP is not started automatically. Suggestion: Use also Data Guard Broker.
Kind regards
Uwe
http://uhesse.wordpress.com

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