[CentOS] swap memory crash

Dear all,

   I am getting below syslog error on my oracle database server running on
RHEL4U5. During this time my swap shows zero on both available and  free in
the top command output , result in total system hang. can any one guide me
how to fix this issue of memory and exactly what  this error indicates??

ERROR FROM SYSLOG

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Aug 30 15:46:20 crmdb kernel: cpu 7 cold: low 0, high 32, batch 16
Aug 30 15:46:20 crmdb kernel:
Aug 30 15:46:20 crmdb kernel: Free pages:       16000kB (2560kB HighMem)
Aug 30 15:46:20 crmdb kernel: Active:1433949 inactive:40363 dirty:1
writeback:0 unstable:0 free:4
000 slab:24910 mapped:1405036 pagetables:565097
Aug 30 15:46:20 crmdb kernel: DMA free:12544kB min:16kB low:32kB high:48kB
active:0kB inactive:0k
B present:16384kB pages_scanned:1878896 all_unreclaimable? yes
Aug 30 15:46:20 crmdb kernel: protections[]: 0 0 0
Aug 30 15:46:20 crmdb kernel: Normal free:896kB min:928kB low:1856kB
high:2784kB active:736kB ina
ctive:208kB present:901120kB pages_scanned:1889 all_unreclaimable? yes
Aug 30 15:46:20 crmdb kernel: protections[]: 0 0 0
Aug 30 15:46:20 crmdb kernel: HighMem free:2560kB min:512kB low:1024kB
high:1536kB active:5735060
kB inactive:161244kB present:8257532kB pages_scanned:0 all_unreclaimable? no
Aug 30 15:46:20 crmdb kernel: protections[]: 0 0 0
Aug 30 15:46:20 crmdb kernel: DMA: 2*4kB 5*8kB 3*16kB 3*32kB 3*64kB 3*128kB
2*256kB 0*512kB 1*102
4kB 1*2048kB 2*4096kB = 12544kB
Aug 30 15:46:20 crmdb kernel: Normal: 0*4kB 28*8kB 2*16kB 0*32kB 0*64kB
1*128kB 0*256kB 1*512kB 0
*1024kB 0*2048kB 0*4096kB = 896kB
Aug 30 15:46:20 crmdb kernel: HighMem: 512*4kB 8*8kB 2*16kB 1*32kB 0*64kB
1*128kB 1*256kB 0*512kB
 0*1024kB 0*2048kB 0*4096kB = 2560kB
Aug 30 15:46:20 crmdb kernel: Swap cache: add 26913978, delete 26700605,
find 10635368/14522876, race 848+1364
Aug 30 15:46:20 crmdb kernel: 0 bounce buffer pages
Aug 30 15:46:20 crmdb kernel: Free swap:       14593184kB
Aug 30 15:46:20 crmdb kernel: 2293759 pages of RAM
Aug 30 15:46:20 crmdb kernel: 1867351 pages of HIGHMEM
Aug 30 15:46:20 crmdb kernel: 216549 reserved pages
Aug 30 15:46:20 crmdb kernel: 44388024 pages shared
Aug 30 15:46:20 crmdb kernel: 213522 pages swap cached
Aug 30 15:46:20 crmdb kernel: Out of Memory: Killed process 22462 (oracle).
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Regards
lingu
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