High Resident and Virtual memory for DBWR

Hello All
on 64 bit RHEL5 with physical memory of 98gb.
I see in OEM db console for 11gR2 database that dbwr processes is consuming 21gb of Resident and Virtual memory.
There are 3 dbwr processes (all using 21g) running and i see swapping happens even there is not much load on database .
Is it normal for dbwr to allocate such high memory ?
other memory config
sga_max_size big integer 60G
sga_target big integer 39808M
pga_aggregate_target big integer 10G

That is an excellent document.
The one thing you have to remember when looking at memory usage of Oracle processes, is they all attach to the same set of shared memory so your values will look high. For example if you assume your sid is XE and run the following command you can get something like this.
ps -eo pid,pmem,pcpu,rss,vsz,args | grep -i XE
29259 0.3 0.0 15004 869972 xe_j000_XE
29305 0.0 0.0 792 6560 grep -i XE
30927 0.2 0.0 10500 870080 xe_pmon_XE
30929 0.2 0.0 8520 869464 xe_psp0_XE
30931 1.4 0.0 58692 869464 xe_mman_XE
30933 5.9 0.0 241388 894124 xe_dbw0_XE
30935 0.3 0.0 14188 885016 xe_lgwr_XE
30937 0.5 0.0 21372 869984 xe_ckpt_XE
30939 2.8 0.0 114928 871024 xe_smon_XE
30941 0.3 0.0 14420 869464 xe_reco_XE
30943 1.3 0.0 55860 871060 xe_cjq0_XE
30945 1.3 0.0 56168 872216 xe_mmon_XE
30947 0.3 0.0 12360 869464 xe_mmnl_XE
30949 0.6 0.0 28260 870348 xe_d000_XE
30951 6.2 0.0 253720 875060 xe_s000_XE
30953 5.6 0.0 227984 875020 xe_s001_XE
30955 5.8 0.0 239556 875068 xe_s002_XE
30957 5.0 0.0 204960 875056 xe_s003_XE
30959 4.2 0.0 174516 875080 xe_s004_XE
30961 5.7 0.0 232812 875028 xe_s005_XE
30963 4.4 0.0 179788 875004 xe_s006_XE
30965 3.2 0.0 132100 874988 xe_s007_XE
30967 2.5 0.0 101676 874980 xe_s008_XE
30969 2.0 0.0 82304 874976 xe_s009_XE
30973 0.4 0.0 19980 885016 xe_arc0_XE
30975 0.4 0.0 19936 885016 xe_arc1_XE
30979 0.2 0.0 9672 869464 xe_qmnc_XE
30985 0.2 0.0 10932 869460 xe_q000_XE
30987 0.2 0.0 9004 869460 xe_q001_XE
Notice how my virtual size is all close to 875Mb for each process more than available with ram and swap space. That is because they all attach to my SGA thus the OS reports the SGA in it's memory listing.
Edited by: user652447 on Apr 11, 2011 9:56 AM

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