Yes, I do have sga_max_size set. -----Original Message----- From: Don Seiler [mailto:don@xxxxxxxxx] Sent: Wednesday, July 29, 2009 7:54 AM To: mathias.magnusson@xxxxxxxxx Cc: Crisler, Jon; oracle-l@xxxxxxxxxxxxx Subject: Re: Solaris 10 and Oracle 10g - swap space problem IIRC, lock_sga isn't valid in Solaris. Jon, do you have sga_max_size explicitly set? I seem to recall this behavior on Solaris 10 when sga_max_size was set explicitly. It caused us much grief if we set sga_max_size to more than half of the total physical memory on the box. Don. On Wed, Jul 29, 2009 at 1:42 AM, Mathias Magnusson<mathias.magnusson@xxxxxxxxx> wrote: > It makes the reservation, but if you have memory it would not use it. You > just end up wasting some disk for swap you'll never use. If you increase > Swap above 64 GB, does it work? Why would it crawl now? Fail for some DBs, > but if you never use Swap, then allocation of it should not impact > performance. Look at memory pressure to make sure the server never does > pagescans - sr column i vmstat - of any real magnutude (over 200 is probably > not desireable in production). > Also, would the parameter lock_sga have any effect in Solaris? I've never > tested it, but in theory it would pin SGA in real memory and never let it go > to Swap, which also would mean that it should not reserve it. It's one of > those parameter I've meant to play with, but I've never gotten around to > actually test the effect. > Mathias > > On Wed, Jul 29, 2009 at 1:31 AM, Crisler, Jon <Jon.Crisler@xxxxxxx> wrote: >> >> On Solaris 10, when I start my databases, I see my swap space usage >> increase in a one for one ratio with memory utilization. System has 64gb >> of memory. If I start up a 4gb database, I see 4gb of real memory used and >> 4gb of swap space used up as well (as shown by top, swap -l, swap -s >> etc.). This is purely a Oracle database server, and /etc/system and >> projects / resource controls seem to be set up, so I do not understand why >> swap is being touched. If I stop all oracle processes, swap drops down to >> about 100 Mb used. >> >> >> >> I have taken great pains to make sure that NO swap is being used, yet any >> little allocation of Oracle gets tossed into swap. I don't know where to >> look after this- I would have suspected /etc/system or resource control / >> projects to be at fault, or /etc/security (ulimits) but everything looks >> ok. The system has 64g real, and about 54 gb swap- if I get close to >> 54gb memory allocated oracle will return out of memory errors.. Needless to >> say the system crawls. >> >> >> >> What am I overlooking ? TOP and swap -s / swap -l agree so its not a TOP >> anomaly >> >> >> >> Example from TOP - I have 20g free, so why so much used in swap ? >> >> >> >> load averages: 0.64, 0.57, >> 0.46 >> 00:26:34 >> >> 1073 processes:1071 sleeping, 2 on cpu >> >> CPU states: 98.3% idle, 1.2% user, 0.5% kernel, 0.0% iowait, 0.0% swap >> >> Memory: 64G real, 20G free, 40G swap in use, 17G swap free >> >> >> >> PID USERNAME LWP PRI NICE SIZE RES STATE TIME CPU COMMAND >> >> 1997 oracle 1 39 0 4376K 2592K cpu/50 0:02 0.04% top >> >> 3454 oracle 1 52 0 16G 16G cpu/32 0:00 0.03% oracle >> >> 3456 oracle 1 24 0 16G 16G sleep 0:00 0.03% oracle >> >> 18589 oracle 1 59 0 16G 16G sleep 0:13 0.02% oracle >> >> >> >> Swap -s >> >> total: 39170184k bytes allocated + 2262264k reserved = 41432448k used, >> 18017608k available > -- Don Seiler http://seilerwerks.wordpress.com ultimate: http://www.mufc.us -- //www.freelists.org/webpage/oracle-l