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RE: dedicated server process memory usage ....

From: Pampati, Sree <Sree.Pampati_at_FMR.COM>
Date: Tue, 8 Jun 2004 09:56:44 -0400
Message-ID: <2E3783C866E6C944B62AECD56D23808302FB1F16@MSGBOSCLB2WIN.DMN1.FMR.COM>


Thanks Mark for your reply!  

I meant : I just opened sqlplus connection using "sqlplus userid/pwd", that's all!  

You said : ..." but please be sure to avoid taking the .6G per server process allocation seriously" . I am not sure how to tune/avoid this ?  

I sincerely appreciate your thoughts on this .    

 pmap -x <pid> is given below:
read/write/exec/shared {ism shmid=0X201 ] figures seem to be very big ?!!!!!!          

8828: oracleqalc4 (DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))

 Address   Kbytes Resident Shared Private Permissions       Mapped File
00010000   48272   25952   25952       - read/exec         oracle
02F42000     472     472     368     104 read/write/exec   oracle
02FB8000     432     320       -     320 read/write/exec     [ heap ]
20000000  536576  536576  536576       - read/write/exec/shared  [ ism
shmid=0x201 ]
FEBC0000      16      16      16       - read/exec         libc_psr.so.1
FEBD0000      88      80      80       - read/exec         libm.so.1
FEBF4000       8       8       -       8 read/write/exec   libm.so.1
FEC00000    4400    2880    2880       - read/exec         libjox9.so
FF05A000     192     192      32     160 read/write/exec   libjox9.so
FF08A000       8       -       -       - read/write/exec   libjox9.so
FF0A0000      16      16      16       - read/exec         libmp.so.2
FF0B4000       8       8       -       8 read/write/exec   libmp.so.2
FF0C0000       8       8       8       - read/exec         libkstat.so.1
FF0D2000       8       8       -       8 read/write/exec   libkstat.so.1
FF0E0000      32      32      32       - read/exec         libaio.so.1
FF0F8000       8       8       -       8 read/write/exec   libaio.so.1
FF100000     688     688     688       - read/exec         libc.so.1
FF1BC000      32      32       -      32 read/write/exec   libc.so.1
FF1D0000      24      24      24       - read/exec         librt.so.1
FF1E6000       8       8       -       8 read/write/exec   librt.so.1
FF1F0000       8       8       -       8 read/write/exec     [ anon ]
FF200000     568     568     568       - read/exec         libnsl.so.1
FF29E000      40      40       -      40 read/write/exec   libnsl.so.1
FF2A8000      24      16       -      16 read/write/exec   libnsl.so.1
FF2C0000       8       8       8       - read/exec         libsched.so.1
FF2D2000       8       8       -       8 read/write/exec   libsched.so.1
FF2E0000       8       8       8       - read/write/exec/shared   [ anon
]
FF2F0000      24      24      24       - read/exec         libgen.so.1
FF306000       8       8       -       8 read/write/exec   libgen.so.1
FF310000      40      40      40       - read/exec
libsocket.so.1
FF32A000       8       8       -       8 read/write/exec
libsocket.so.1
FF330000       8       8       8       - read/exec         libskgxn9.so
FF340000       8       8       -       8 read/write/exec   libskgxn9.so
FF350000       8       8       8       - read/exec         libskgxp9.so
FF360000       8       8       -       8 read/write/exec   libskgxp9.so
FF370000       8       8       -       8 read/write/exec     [ anon ]
FF380000       8       8       8       - read/exec         libodmd9.so
FF390000       8       8       -       8 read/write/exec   libodmd9.so
FF3A0000       8       8       8       - read/exec         libdl.so.1
FF3B0000     160     160     160       - read/exec         ld.so.1
FF3E6000      16      16       -      16 read/write/exec   ld.so.1
FFBE6000      40      40       -      40 read/write          [ stack ]
--------  ------  ------  ------  ------
total Kb  592320  568344  567512     832
 

febiccp_at_eceisdblc4 - qalc4    

Thanks,
Sree Pampati
617-392-1594

	-----Original Message-----
	From: Mark W. Farnham [mailto:mwf_at_rsiz.com] 
	Sent: Monday, June 07, 2004 10:34 AM
	To: oracle-l_at_freelists.org
	Subject: RE: dedicated server process memory usage ....
	
	
	Unfortunately it is non-trivial to figure out how much of the
shared memory area of the running Oracle instance is reported as part of each server connection, and this varies by OS, release of OS, and tool used to report "sz" and "RSS."          

        I'm not sure what you meant about "no SQL fired" since I'm not aware of how to open a sqlplus connection without the query of username/password firing, along with whatever level of auditing you may have.          

        Possibly someone else can refer you to a good resource for evaluating MTS, but please be sure to avoid taking the .6G per server process allocation seriously. I doubt Solaris 8 has this problem, but some old Unix varieties had page/swap limits that did not take into account shared memory, so executing a table scan would drive "false paging" unless you configured "RSSMAX" to the ceiling of your shared memory plus the program space. By "false paging" I mean copying shared memory your process has mapped to page or swap (from whence it will never be recalled, since the shared memory is still actually current.) Setting the RSSMAX high would in turn then allow applications to run rampant on your memory, so this tipped the balance of whether to allow a certain application on your database server far in favor of saying no if an application had big libraries.          

        Good luck!                    

-----Original Message-----

                From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Pampati, Sree

		Sent: Monday, June 07, 2004 9:42 AM
		To: oracle-l_at_freelists.org
		Subject: dedicated server process memory usage ....
		
		
		Hi,
		 
		How is memory allocated to a dedicated server process ?
I just opened a sqlplus connection ( no SQL fired!), did ps -elf | grep <pid> on the server pid, which showed sz: 592M, RSS: 558. There are about 800 server processes running at that time ( the box has 10G physical mem, of which about 2GB was free at that time. Solaris 8 . Oracle version :9.2.0.4 ).                  
		*_area_size parameters in init.ora  are :
bitmap_merge_area_size = 1048576     (1MB)
	

create_bitmap_area_size= 8388608 (8MB)         

hash_area_size = 4194304 (4MB)         

sort_area_size                = 2097152     (2MB)
		 
		 
		Oracle 10gAS and 9iAS too are running on the box in
addition to the oracle instance.                  

                Is this a good candidate for MTS ? Do I get substantial benefit using pga_target_aggregate features of 9i ?                  

                I would very sincerely appreciate your valuable feed back ( any pointers to docs/info are highly appreciated).                  

		Thanks, 
		Sree Pampati 
		

-----Original Message-----
From: Darrell Landrum [mailto:darrell_at_landrum.com] Sent: Saturday, June 05, 2004 12:58 AM To: oracle-l_at_freelists.org Subject: Re: Hardware Question Hey Jay, I hate when management comes to me with
questions like you mention about this new hardware handling the workload.

                        But, I have a response now that I love because it can be confusing to them.

			I simply ask, "Why?".
			Why are they looking at new hardware?  Does the
current hardware not handle the workload? Is there a forthcoming app server/database upgrade that will require more resources? Are they scaling out their current utilization, perhaps to more users? Are they adding more databases? I know this may not seem like the best attitude and trust me, I love newer, faster hardware more than most, but really the justification for new hardware should come before the shopping for hardware. In my role as a DBA, I should be the one (or, of course, the sys admins) that recognizes the need for hardware upgrades and hopefully before management starts to feel the need. If I can't quantify the need for new servers or additional hardware (or software for that matter), I actually speak against it. This way, when I tell them we need something, they listen!
			Just one guy's 2 cents.
			However, you mention a bottleneck on the SAN
controllers. That is a big red flag. There's always a chance (and some would argue a very good chance) that faster processors and more memory will make this SAN controller bottleneck worse or at least more noticeable. Hopefully, additional channels to the SAN are being considered with this new box as well.                          

                        Good luck!



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Received on Tue Jun 08 2004 - 08:55:40 CDT

Original text of this message

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