database is shutting down frequently

[nishantprabha]

My database is shutting down frequently (once in 24 hours)

Please see the below Alert file and trace file and suggest me what should I do


Alert file
=========
Mon May 04 11:44:05 2009
Process q002 started up but failed with error = 20
Process q002 started up but failed with error = 20
Process q002 started up but failed with error = 20
Process q002 started up but failed with error = 20
Process q002 started up but failed with error = 20
Mon May 04 11:49:18 2009
Process q005 started up but failed with error = 20
Process q005 started up but failed with error = 20
Process q005 started up but failed with error = 20
Process q005 started up but failed with error = 20
Process q005 started up but failed with error = 20
Mon May 04 11:51:02 2009
Private_strands 7 at log switch
Thread 1 advanced to log sequence 44692
Current log# 3 seq# 44692 mem# 0: D:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCLJDE\REDO03.LOG
Mon May 04 11:52:31 2009
Errors in file d:\oracle\product\10.1.0\admin\orcljde\udump\orcljde_ora_3800.trc:
ORA-25254: time-out in LISTEN while waiting for a message
ORA-06512: at “SYS.DBMS_AQ”, line 577
ORA-06512: at “SYSMAN.EMD_NOTIFICATION”, line 492
ORA-06512: at line 1
————————————————————————————————

When I checked individual trace file it shows as below
=====================================

Dump file d:\oracle\product\10.1.0\admin\orcljde\bdump\orcljde_ora_4392.trc
Mon May 04 11:02:28 2009
ORACLE V10.1.0.2.0 - Production vsnsta=0
vsnsql=13 vsnxtr=3
Oracle Database 10g Enterprise Edition Release 10.1.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
Windows Server 2003 Version V5.2 Service Pack 2
CPU : 4 - type 586, 2 Physical Cores
Process Affinity: 0×00000000
Memory (A/P) : PH:20392M/24575M, PG:27290M/32151M, VA:940M/2047M
Instance name: orcljde

Redo thread mounted by this instance: 1

Oracle process number: 0

4392

Died during process startup with error 20 (seq=1464)
OPIRIP: Uncaught error 20. Error stack:
ORA-00020: maximum number of processes (150) exceeded


Plz help me

[PAVB]

ORA-00020: maximum number of processes (150) exceeded

How about starting by pumping up processes and sessions values?

[nishantprabha]

Yes ,To increase the number of processes.

Current value is 150 . Im planning to increase it to 200 or 250.

But my worry is, will it affect anywhere else in the system.. Do I need to provide more space in SGA or PGA? because we have only 4Gb RAM in which I have mentioned SGA = 700 MB and PGA = 100 MB..And I have enabled Automatic Share Memory Management.

Please let me know which part of the system will affected by increasing the number of processes? Also what are all the negative part (if any) by increasing the processes

[malay_biswal]

You are executing with only 700MB of SGA. Did you check buffer pool advisory? Try what PAVB mentioned and let us know if that helps.

[gtcol]

Why is PGA only 100m? How many concurrent users work in a time? I also doubt you've your db in dedicated server mode.

[nishantprabha]

our server is dedicated server. and we have hardly 100 users logging at a time.

Currently we have enabled ASMM (Automatic Shared Memory Management). So I think even if I increase the processes ,Shared pool size will be taken care by ASMM (as no manual control due to enabling ASMM)

hope increasing processes will not affect sharedpool and other areas.. if you know what other areas it can affect please let me know.. So that i can be more cautious in that relevant areas.

Thanks

[PAVB]

if you know what other areas it can affect please let me know.

Yes, we know.

Do you know why we know? in most cases because we bother in reading the documentation.

Take a look here http://download-east.oracle.com/docs...43/process.htm

[gtcol]

Please go through the document suggested by PAVB. This will surely help you learn more about processes with Oracle, giving you closer look at Oracle architecture and how it functions.