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Process PC,PO,PD died

Update:11-30Source: network consolidation
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Dear sir,
In our database, on peck hour, alert log show like bellows.... what would be the cause ?
is it lack of OS resource/incorrect configuration or anything please sir ?
total OS RAM := 63.60 GB
sga_max_size 36.80 G
sga_target 36.80 G
pga_aggregate_target 14G
processes 4000
and etc/system is
set noexec_user_stack=1
set semsys:seminfo_semmni=100
set semsys:seminfo_semmsl=256
set shmsys:shminfo_shmmax=57982058496
set shmsys:shminfo_shmmni=100
Database version :- 10.2.0.4
OS :- Sun Solaries spark 64 bit
Mon Apr  4 11:52:21 2011
Error occured while spawning process PH18; error = 3135
Mon Apr  4 11:52:57 2011
Error occured while spawning process PH56; error = 3135
Mon Apr  4 11:53:40 2011
Error occured while spawning process PH89; error = 3135
Mon Apr  4 11:53:41 2011
Timed out trying to start process PH92.
Mon Apr  4 11:55:06 2011
Thread 1 advanced to log sequence 82960 (LGWR switch)
  Current log# 9 seq# 82960 mem# 0: /d01/oracle/oradata/stlbas/redo09.log
Mon Apr  4 11:55:25 2011
Timed out trying to start process PI80.
Mon Apr  4 11:55:43 2011
Timed out trying to start process PJ12.
Mon Apr  4 11:56:58 2011
Error occured while spawning process PB34; error = 3135
Mon Apr  4 11:57:49 2011
Error occured while spawning process PK51; error = 3135
Mon Apr  4 11:57:58 2011
Timed out trying to start process PL14.
Mon Apr  4 12:00:26 2011
Error occured while spawning process PA07; error = 3135
Mon Apr  4 12:01:24 2011
Timed out trying to start process PB59.
Mon Apr  4 12:01:54 2011
Process PC93 died
Mon Apr  4 12:01:55 2011
Timed out trying to start process PO36.
Mon Apr  4 12:01:56 2011
Process PC96 died
Mon Apr  4 12:01:58 2011
Process PO37 died
Mon Apr  4 12:02:01 2011
Process PD03 died
Mon Apr  4 12:02:02 2011
Process PD04 died
Mon Apr  4 12:02:04 2011
Process PO42 died
Mon Apr  4 12:02:07 2011
Process PD08 died
Mon Apr  4 12:02:08 2011
Process PO44 died
Mon Apr  4 12:02:09 2011
Process PO45 died
Mon Apr  4 12:02:10 2011
Process PD10 died
Mon Apr  4 12:02:11 2011
Process PD11 died
Mon Apr  4 12:02:12 2011
Process PO47 died
Mon Apr  4 12:02:13 2011
Process PO48 died
Mon Apr  4 12:02:14 2011
Process PO49 died
Mon Apr  4 12:02:15 2011
Process PD14 died
Mon Apr  4 12:02:16 2011
Process PO50 died
Mon Apr  4 12:02:17 2011
Process PD15 died
Mon Apr  4 12:02:20 2011
Process PO51 died
Mon Apr  4 12:02:22 2011
Timed out trying to start process PD25.
Mon Apr  4 12:02:23 2011
Process PO53 died
Mon Apr  4 12:02:24 2011
Process PO54 died
Mon Apr  4 12:02:26 2011
Timed out trying to start process PD26.
Mon Apr  4 12:02:27 2011
Process PD29 died
Mon Apr  4 12:02:28 2011
Process PC93 died
Mon Apr  4 12:02:29 2011
Process PO56 died
Mon Apr  4 12:02:30 2011
Process PO57 died
Mon Apr  4 12:02:31 2011
Process PD30 died
Mon Apr  4 12:02:32 2011
Process PC96 died
Mon Apr  4 12:02:41 2011
Process PO62 died
Mon Apr  4 12:02:43 2011
Process PO64 died
Mon Apr  4 12:02:44 2011
Process PD56 died
Mon Apr  4 12:02:46 2011
Process PD57 died
Mon Apr  4 12:02:47 2011
Process PD59 died
Mon Apr  4 12:02:49 2011
Thread 1 advanced to log sequence 82961 (LGWR switch)
  Current log# 10 seq# 82961 mem# 0: /d01/oracle/oradata/stlbas/redo10.log
Mon Apr  4 12:02:49 2011
Process PD60 died
Mon Apr  4 12:02:50 2011Thanks & Regards
Halim
http://halimdba.blogspot.com

The Best Answer

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Thanks Helios
OK , i will try to bounce db on Friday night .
but in that note says
"You have recently added data files to your system and your database has
crashed. Startup raises errors ORA-00449, ORA-01092, ORA-00470, and ORA-00447."
My situation is not this.
well, what are they mean by - *Action: Warm start instance .
Regards
Halim
http://halimdba.blogspot.com/
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