Reg:-SGA & PGA Memory Allocation Size

Hi all
I Have a server System Configuration with
RAM size: 16GB Ram & Hard disk Size of 1TB.
I Installed Oracle 11g R2 in the server System
I want to Allocate Dedicated Memory for oracle..
How Should i calculate the Memory size of SGA+PGA for good Performance..

Check MOS
*How to calculate the memory used by dedicated and shared servers? [ID 551415.1]*

Similar Messages

SGA/PGA (Memory) in RAC environment.

Guys,
I would like to get your inputs on SGA / PGA settings on a RAC database.. Does LMS/LMON/LMD process use memory which is part of PGA or these process allocate memory at OS level ?
I would like to see the usage of Memory used by a database.
below sql from Mr. Kyte's website i have used. Somehow i am not getting real usage of the system. Any help would be appreciated.
Thanks
select
ssst.sid,
stn.name ,
round(ssst.value/1024/1024,2) memory ,
USERNAME,
COMMAND,
OSUSER,
MACHINE,
TERMINAL,
PROGRAM ,
ssst.STATISTIC#
from v$statname stn,v$sesstat ssst , v$session ses
where stn.STATISTIC# = ssst.STATISTIC# and
ssst.sid = ses.sid and
name like 'session%pga%memory%'
order by 3 asc ;
Edited by: P explorer on Aug 28, 2009 9:56 PM

From sql script, that get "session pga memory","session pga memory max" each of session in oracle database(on that node)
You'll see
sid: session id
memory:
if "session pga memory" = pga memory in this session now
if "session pga memory max"= maximum pga memory in this session.
program: os program name
More deatails abour v$session http://download.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2088.htm#REFRN30223
If need to know all PGA size in that node
"session pga memory":
select
round(sum(ssst.value)/1024/1024,2) memory
from v$statname stn,v$sesstat ssst , v$session ses
where stn.STATISTIC# = ssst.STATISTIC# and
ssst.sid = ses.sid and
name ='session pga memory';
"session pga memory max":
select
round(sum(ssst.value)/1024/1024,2) memory
from v$statname stn,v$sesstat ssst , v$session ses
where stn.STATISTIC# = ssst.STATISTIC# and
ssst.sid = ses.sid and
name ='session pga memory max';
Or if you need to check PGA memory all nodes (RAC)
COLUMN username FORMAT A20
COLUMN module FORMAT A20
SELECT a.inst_id,
NVL(a.username,'(oracle)') AS username,
a.module,
a.program,
Trunc(b.value/1024) AS memory_kb
FROM gv$session a,
gv$sesstat b,
gv$statname c
WHERE a.sid = b.sid
AND a.inst_id = b.inst_id
AND b.statistic# = c.statistic#
AND b.inst_id = c.inst_id
AND c.name = 'session pga memory'
AND a.program IS NOT NULL
ORDER BY b.value DESC;

SGA+PGA Size allocation

Hi all
I Have a server System Configuration with
RAM size: 16GB Ram & Hard disk Size of 1TB.
I Installed Oracle 11g R2 in the server System
I want to Allocate Dedicated Memory for oracle..
How Should i calculate the Memory size of SGA+PGA for good Performance..

Pl do not post duplicates - Reg:-SGA & PGA Memory Allocation Size

Memory allocation much more than size of table TST03

Hi all,
I found a strange situation, in our system, memory allocation in SP12 shows 2GB is used in DB side, but when I go to transaction DB02 to check the table TST03, it only has 50MB. Our parameter rspo/store_location is already set to 'db'.
System environment is: ECC6 running on AIX 53/Oracle 10g, 64bit.
In my opinion, temse data will be stored in TST03, so I think TST03 size should be larger than memory allocation result in SP12.
Could you please help me about this?
Thanks and regards

Hi Justin
Nice question, really made me think. I just checked, in the newer SAP versions, TST03 has a BLOB column, in the older versions there was a LONG RAW col.
I bet you have the BLOB (ECC6), you can check in sqlplus:
[code]SQL> desc sapsr3.tst03
Name                                      Null?    Type
DCLIENT                                   NOT NULL VARCHAR2(9)
DNAME                                     NOT NULL VARCHAR2(60)
DPART                                     NOT NULL NUMBER(5)
DROWNO                                    NOT NULL NUMBER(10)
DDATALEN                                  NOT NULL NUMBER(5)
DCONTENT                                           BLOB[/code]
A lob column is stored in a seperate segment:
[code]SQL> select SEGMENT_NAME from dba_lobs where table_name = 'TST03';
SEGMENT_NAME
SYS_LOB0000031954C00006$$[/code]
Just replace your segment_name to get the size, you can enter the segment in DB02 too:
[code]SQL> select BYTES/1024/1024 "SIZE_MB" from dba_segments where segment_name = 'SYS_LOB0000031954C00006$$';
   SIZE_MB
        12[/code]
Regards
Michael

SGA/PGA Sizes ???

I need help!
I have a Windows 2003 Server (w/sp2) with 4GB of RAM & 2 CPUs. Oracle 10.2.0.2 is installed.
ASMM is ENABLED by default (and it still is)
These are my sga/pga settings:
pga_aggregate_target = 1G
sga_max_size = 1504M
sga_target = 1000M
shared_pool_size = 504M
sort_area_size = 262144000 (250M)
large_pool_size = 104M
db_cache_size = 104M
I believe I should DISABLED ASMM, correct? Otherwise, my settings aren't used.
Based on my 4GB, I think Oracle can use 2GB of that.
What should I set the settings above too?
...thanks

First if you use Oracle's automatic memory management feature and provide spfile parameter values for parameters that are automatically managed by Oracle then the provided values are taken as minimum values for these areas. There are other situations where values for parameters like sort_area_size which is limited to 5% of pga_aggregate_target are in fact still referenced.
With a pga_aggregate_target of 1G I do not see any valid reason why you would have a sort_area_size set to 250M. What is the reason for this?
What kind of environment is this: OLTP, DSS, OLAP?
How many concurrent sessions?
Dedicated vs shared server?
Why do you not want to use automatic memory management? What problem have you encountered?
HTH -- Mark D Powell --

PGA memory problem - Oracle 10.2.0.4 on windows 2003

Hi,
I have recently started work at a new company and we are running Oracle 10g (10.2.0.4, Enterprise Edition) on Windows 2003 (Standard Edition). The server has 4Gb of RAM (and we have modified boot.ini to inclue the /3Gb switch).
RE: SGA/PGA, we have the following Oracle parameters set:
sga_target 1G
pga_aggregate_target 194M
The employees tell me that they frequently "have to reboot the database" because of ORA-4030 and ORA-4031 problems. Looking at taskmgr on the server, Oracle is using "too much" memory (~3Gb). New sessions cannot connect etc. and they restart the database. Being a DBA (experience in UNIX, not Windows) I'm not so keen on this "solution" and am trying to find out what's happening.
When this problem occurred yesterday, before allowing the reboot, I bought myself some time to have a little dig around in the database. In v$sesstat I saw one process that had a value of over 1GB for "session pga memory". Memory usage on the server for oracle.exe was (as predicted) ~1GB over the "expected" 1.2Gb value (of SGA+PGA agg target). So, part 1 of my question is:
- Is this "normal" behaviour for Oracle to allow a process to go so wild on the PGA?
(I understood that Oracle would attempt to maintain total PGA memory close to the value of PGA_AGGREGATE_TARGET. I believe I read in the documentation that it could allow PGA memory to increase "up to 20% over this value" but please don't quote me on that, I can't find it again..)
Part 2 to this problem is that sessions "collect" in the database and do not release their PGA memory, leading to the slow build up of memory until the errors are encountered. I believe Dead Connection Detection (DCD) not to be working here (sql_net.expire_time=1 is set on the server but appears to do nothing). I've started reading docs/notes on this and it seems that DCD is not reliable on Windows. Metalink Doc 151972.1 suggests testing and adjusting some underlying TCP/IP serttings in the O/S kernel (I'm not even sure how to do this in Windows yet, let alone if it's something I want to get involved with!). So:
- I'm wondering if anyone has any tips for this (killing off dead connections, getting DCD working in Windows 2003 etc.)? Any experiences, tips welcome here!!
Thanks in advance.
Regards,
Ados

user647632 wrote:
(By the way, can anyone recommend how to sort the formatting of these results please?!!)You can find all by clicking the Oracle Forum FAQ
</br>
Here is my PGASTAT result. Have a look at the values.
SQL> column name format a60
column value format 9,999,999,999,999,999
select * from gv$pgastat order by inst_id,name;
SQL> SQL>
   INST_ID NAME                                                                          VALUE UNIT
         1 PGA memory freed back to OS                                         202,362,322,944 bytes
         1 aggregate PGA auto target                                             1,831,209,984 bytes
         1 aggregate PGA target parameter                                        2,147,483,648 bytes
         1 bytes processed                                                     287,247,907,840 bytes
         1 cache hit percentage                                                             68 percent
         1 extra bytes read/written                                            133,790,002,176 bytes
         1 global memory bound                                                     214,743,040 bytes
         1 max processes count                                                              48
         1 maximum PGA allocated                                                 1,708,733,440 bytes
         1 maximum PGA used for auto workareas                                   1,112,871,936 bytes
         1 maximum PGA used for manual workareas                                       271,360 bytes
   INST_ID NAME                                                                          VALUE UNIT
         1 over allocation count                                                             0
         1 process count                                                                    42
         1 recompute count (total)                                                     136,756
         1 total PGA allocated                                                     328,158,208 bytes
         1 total PGA inuse                                                         196,502,528 bytes
         1 total PGA used for auto workareas                                        81,608,704 bytes
         1 total PGA used for manual workareas                                               0 bytes
         1 total freeable PGA memory                                                96,927,744 bytes
19 rows selected.
SQL>
SQL> column BYTES_PROCESSED format 9,999,999,999,999,999
column EST_RW_EXTRA_BYTES format 9,999,999,999,999,999
SQL> SQL> select inst_id,round(pga_target_for_estimate/1024/1024) as target_size_MB,
2                bytes_processed,estd_extra_bytes_rw as est_rw_extra_bytes,
3                estd_pga_cache_hit_percentage as est_hit_pct,
4                estd_overalloc_count as est_overalloc
5 from gv$pga_target_advice order by inst_id,target_size_mb;
   INST_ID TARGET_SIZE_MB        BYTES_PROCESSED     EST_RW_EXTRA_BYTES EST_HIT_PCT EST_OVERALLOC
         1            256        285,418,388,480        188,648,610,816          60             4
         1            512        285,418,388,480        131,006,145,536          69             0
         1           1024        285,418,388,480         92,476,995,584          76             0
         1           1536        285,418,388,480         91,536,565,248          76             0
         1           2048        285,418,388,480         72,373,725,184          80             0
         1           2458        285,418,388,480         68,650,139,648          81             0
         1           2867        285,418,388,480         68,650,139,648          81             0
         1           3277        285,418,388,480         68,650,139,648          81             0
         1           3686        285,418,388,480         68,650,139,648          81             0
         1           4096        285,418,388,480         68,650,139,648          81             0
         1           6144        285,418,388,480         68,650,139,648          81             0
   INST_ID TARGET_SIZE_MB        BYTES_PROCESSED     EST_RW_EXTRA_BYTES EST_HIT_PCT EST_OVERALLOC
         1           8192        285,418,388,480         68,650,139,648          81             0
         1          12288        285,418,388,480         68,650,139,648          81             0
         1          16384        285,418,388,480         68,650,139,648          81             0
14 rows selected.
SQL>
SQL> show parameters pga
NAME                                 TYPE        VALUE
pga_aggregate_target                 big integer 2G
SQL> show parameters sga_max
NAME                                 TYPE        VALUE
sga_max_size                         big integer 2G
SQL> show parameters sga_target
NAME                                 TYPE        VALUE
sga_target                           big integer 2G
SQL>

Oracle 11g SGA & PGA setup

Hi I installed oracle 11g & create database , now i want to use fully optimize database.
Currently my DB server RAM is 16GB, how should i allocate SGA for this.If i used oracle 11g automatic memeory management feature to allocate SGA+PGA, how should i use them.Currentlymy SGA is set to 4GB, Please advise

Hi,
It is depends upon the workload which you have in your organization(future and present situation)
SGA+PGA size will be automatically managed by Oracle. No need to worry about this.
If you need to increase Memory_Max_Size, you can also increase the Memory size in the future.
Thanks

PGA memory Leak issue along with TNS: listener could not hand off client connection

Hi,
We have two Oracle Database instances in a 32 bit Standard Edition Windows OS machine with 3 GB RAM : 1) 1525 MB (SGA+PGA) 2) 515 MB (SGA+PGA)
Recently we upgraded the RAM from 3 GB to 4 GB. Subsequently we upgraded the SGA + PGA of the 2nd instance to 771 MB.
This has resulted into PGA memory leak issue reported in the alert log file and trace file.
Reverting back the SGA+PGA size to 515 MB solved the issue.
Is this issue related to Address Windowing Extension (AWE)?
Is the reason related to Total memory for all the cumulative Oracle instance should be < 2GB.
How to solve this?
Mon Jul 15 08:21:25 2013
ORACLE V10.2.0.4.0 - Production vsnsta=0
vsnsql=14 vsnxtr=3
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
Windows Server 2003 Version V5.2 Service Pack 2
CPU                 : 4 - type 586, 4 Physical Cores
Process Affinity    : 0x00000000
Memory (Avail/Total): Ph:1068M/4023M, Ph+PgF:4985M/7933M, VA:18M/2047M
Instance name: dp3
Redo thread mounted by this instance: 0 <none>
Oracle process number: 0
Windows thread id: 4484, image: ORACLE.EXE (SHAD)
*** 2013-07-15 08:21:25.133
*** ACTION NAME:() 2013-07-15 08:21:25.133
*** MODULE NAME:() 2013-07-15 08:21:25.133
*** SERVICE NAME:() 2013-07-15 08:21:25.133
*** SESSION ID:(90.829) 2013-07-15 08:21:25.133
******** ERROR: PGA memory leak detected 6302928 > 30176 ********
HEAP DUMP heap name="pga heap" desc=6C98A800
extent sz=0x206c alt=92 het=32767 rec=0 flg=3 opc=3
parent=00000000 owner=00000000 nex=00000000 xsz=0x0
EXTENT 0 addr=7FC10008
Chunk 7fc10010 sz=    64996    free      "               "
Chunk 7fc1fdf4 sz= 2097676    freeable "krfrbAllocate: "
Dump of memory from 0x7FC1FDF4 to 0x7FE20000
7FC1FDF0          1020020D 7FC10010 03871E90      [.. .........]
7FC1FE00 00000000 00000000 00000000 00000000 [................]
Repeat 131103 times
EXTENT 1 addr=7FA00008
Chunk 7fa00010 sz=    64996    free      "               "
Chunk 7fa0fdf4 sz= 2097676    freeable "krfrbAllocate: "
Dump of memory from 0x7FA0FDF4 to 0x7FC10000
7FA0FDF0          1020020D 7FA00010 03871E90      [.. .........]
7FA0FE00 00000000 00000000 00000000 00000000 [................]
Repeat 131103 times
EXTENT 2 addr=7F7F0008
Chunk 7f7f0010 sz=    64996    free      "               "
Chunk 7f7ffdf4 sz= 2097676    freeable "krfrbAllocate: "
Dump of memory from 0x7F7FFDF4 to 0x7FA00000
7F7FFDF0          1020020D 7F7F0010 03871E90      [.. .........]
7F7FFE00 00000000 00000000 00000000 00000000 [................]
Repeat 131103 times
EXTENT 3 addr=70A50008

There may be something fixed in the patch that gives the error rather than mysterious hangs. I would prefer that, myself. There may be something in the patch that changes how Oracle allocates user, system and program areas.
At some point you spend more trying to limp things along in a growing environment than simply upgrading. 32 bit environments these days is an indicator that management is figuring some false economies. But that's their prerogative.
The PGA can be affected by many things, not least of which is how the application uses it. Much has been written about it, my own experience has been more is used than most people say. But that is probably just my app. Note there are different ways to set it, and a parameter with "target" in it might not be a hard limit. Different execution plans for the same code may use different amounts of memory - there can even be situations where forcing some code to use a sort area instead, or even forcing more operations to disk, can free up more pga for everyone else. It depends. But that's why I look at multi-pass operations in dbconsole.

Memory Allocation in database ...

These are the parameters which i given to my database .Actualy my db version is 11.1.0 but compatible is 10.2.0...thats why i am using these parameters in my init.ora...
*.java_pool_size=110102400
*.large_pool_size=110102400
*.shared_pool_size=536870912
*.shared_pool_reserved_size=31457280
*.db_cache_size=512670912
*.streams_pool_size=0
*.log_buffer=32768
*.pga_aggregate_target=50M
*.sga_max_size=1695483648
But when i am connecting to database my total SGA
SQL> show sga (((11.1.6)))
Total System Global Area 1704132608 bytes
Fixed Size 2089304 bytes
Variable Size 1174412968 bytes
Database Buffers 520093696 bytes
Redo Buffers 7536640 bytes
Actually i created this database as per other db which was there in 8.1.6...
But when i am comparing with the 8i db my SGA which i given has too much different ...
SQL> show sga (((8.1.6 SGA)))
Total System Global Area 1718366368 bytes
Fixed Size 73888 bytes
Variable Size 406507520 bytes
Database Buffers 1310720000 bytes
Redo Buffers 1064960 bytes
Here i dont know there is too much difference in FIXED SIZE,VARIABLE SIZE, DATABASE BUFFERS and REDO BUFFERS...
COuld some one tell why its come that much differnece...My TOTAL RAM IS 2GB ...Please let me know how I can set my 11g db Memory .. like 8i database memory
Please give your valuable suggestions ..It helps a lot ..

Pavan,
hi memory allocation should always depends on how many transactions hitting your database. it is not appropriate to set 1.5GB or less than that if your database is getting only 1-2 lakh tx's per day.
You have any reference doc to prove this point? On what basis one would assume his memory sizes when the transactions everyday are increasing in a database?
i remember 11g is having a wonderful parameter called MEMORY_TARGET. if possible please use that
I agree its a good parameter.Just an additional note for it It has a different algorithm to allocate the memory. You need to tweak your machine some times a bit to make this parameter work. The memory allocations of /dev/shm needs some time to be tweaked.
Aman....

Oracle 10g R2 x64 Windows - Memory allocation

I've installed Oracle 10g R2 x64 on Windows Server 2003 STD X64.
My SGA is configured to use 65% of total memory (3,5Gb).
After few days since instance startup, virtual meory size grow up to 6Gb and OS crash.
Anyone can help me?
Thanks in advance

You might have to work with Oracle support see if you have memory leaking problem.
While your oracle.exe growing VM size, run a statspack report and following query for a quick checking,
select * from v$sgainfo
1 select se.sid, n.name, max(se.value) maxmem
2 from v$sesstat se,
3 v$statname n
4 where n.statistic#=se.statistic#
5 and n.name like 'session pga%'
6 group by n.name, se.sid
7* order by 3 desc
SQL> /
       SID NAME                                                                 MAXMEM
       216 session pga memory max                                             11836008
       216 session pga memory                                                 11687880
       212 session pga memory max                                              7960728
       225 session pga memory max                                              5880632
       200 session pga memory max                                              5282408
       200 session pga memory                                                  5282408
       217 session pga memory max                                              3995992
       217 session pga memory                                                  3668312
       214 session pga memory max                                              3626952
       212 session pga memory                                                  3176600
....

AWR SGA+ PGA usage

Hi
We're doing some performance testing on our database. The SGA is set to 1.5GB and PGA set to 0.5GB. At some point we are runnning out of memory as we ramp up the number of users and transactions .
What I'm looking for is to graph the PGA and SGA usage seperately regular intervals (a line graph) showing their increaase as users ramp up.
Anyone any ideas on how I can get this information whether through AWR or manually.
Thanks in advance.

You have not posted the version you are on. You should use automatic pga management and unset the values for areasize parameters (if there is no specific reason for keeping them).
ORA-04030: out of process memory when trying to allocate 8389132 bytes (pga heap,redo read buffer)
Doing block recovery for file 3 block 76812
Resuming block recovery (PMON) for file 3 block 76812What are the OS level statistics of memory usage ?
It simply means that Oracle (rather OS...as Oracle is also going to request memory from OS only) is running out of memory. Most common reason behind that is use of features like bulk collect without any limit clause which causes the pga memory to grow beyond pga_aggregate_target...and finally sucking all the memory available. Further requests for memory allocation start failing with ORA-04030.
Also, please post the output from v$pgastat using tags.
Edited by: amardeep.sidhu on Nov 24, 2010 9:29 AM

SGA & PGA target

Hi all,
My questions is regarding how to set up SGA & PGA target values giving DB server is MS 2003 Enterprise 64 edition sever with 63 GB of RAM. Our DB’s version is 10.2.0.3 and RACed with 2 instances.
Currently our setting for SGA is 23 GB and PGA is 4 GB. I ran the memory advisor it display different optimal values for those two instances (35 GB and 23 GB for SGA, 5 GB and 4 GB for PGA). Guess our db is not well balance loaded.
I would like to know if there is any rule(s) that SGA can’t be more than certain percentage of total RAM for the server.
Thanks a lot in advance.
Have a great weekend!!
Shirley

Hi
Here is my approach:
1) consider free physical memory (meassure must be taken with Oracle down)
2) substract a 10% of that amount as a margin
3) if the box is exclusive for Oracle, the remaining amount may be your SGA+PGA limit
4) if not is exclusive, then substract memory required for other services, then you'll get the SGA+PGA limit.
5) Substract your PGA size, giving the SGA figure
For instance
59 Gb - 6 Gb = 53 Gb - 4 Gb = 49 Gb
(63 Gb -4 Gb [estimated OS footprint + IO cache]) = 59 Gb free physical memory
Setting PGA+SGA beyond the free physical memory figure, may lead to swaping and degraded system performance.
Regards
http://oracledisect.blogspot.com

SGA, PGA and... little extra?

Will oracle process use some extra "non oracle" memory for OS related stuff?
Mean, not considering SGA, I connect a database process and I see:
SQL> select p.program,
2 p.spid, pm.category, pm.allocated/1024 allocated, pm.used/1024 used, pm.max_allocated/1024 max_allocated
3 from V$PROCESS p, V$PROCESS_MEMORY pm
4 where p.pid = pm.pid
5 and p.spid =2650;
                                                                                                        Max
                                                                          Allocated       Usedd   allocated
PROGRAM                        SPID                     CATEGORY                 Kb          Kb          Kb
oracle@uxlabhost11             2650                     SQL                      14           9          42
oracle@uxlabhost11             2650                     PL/SQL                   56          34          57
oracle@uxlabhost11             2650                     Other                  1501                    1501That's allocated PGA after having connected and done nothing else
So it somehow allocated 1.4 Mb upon start-up...
Now question is. Do oracle processes use OS memory which cannot be considered as SGA or PGA?
Reason being my trying to estimate memory needs for a database server. Many I've read correct formula should be SGA + max allocated PGA + some_extra_just_in_case...
Is there an estimate on how much that "some_extra_just_in_case" would be per process?
If OS dependent, I'm implementing on RHEL 6...
thanks

So, I've used pmap...
Got 257 enties in the form "4096K rw-s- /dev/shm/"
since we are using AMM , that should do for PGA and SGA ... some 1052672 Kb, which process is attached to...
yet pmap then continues to display other entries....
0000002a95557000      4K r-x-- /opt/oracle/product/11g/lib/libodm11.so
0000002a95558000   1024K ----- /opt/oracle/product/11g/lib/libodm11.so
0000002a95658000      4K rw--- /opt/oracle/product/11g/lib/libodm11.so
0000002a95659000      4K rw---    [ anon ]
0000002a9565a000    392K r-x-- /opt/oracle/product/11g/lib/libcell11.so
0000002a956bc000   1024K ----- /opt/oracle/product/11g/lib/libcell11.so
0000002a957bc000     40K rw--- /opt/oracle/product/11g/lib/libcell11.so
0000002a957c6000      4K rw---    [ anon ]
0000002a957c7000    864K r-x-- /opt/oracle/product/11g/lib/libskgxp11.so
.. TRUNCATED...
0000003fb810a000     64K rw---    [ anon ]
0000003fbbd00000     84K r-x-- /lib64/libnsl-2.3.4.so
0000003fbbd15000   1020K ----- /lib64/libnsl-2.3.4.so
0000003fbbe14000      4K r---- /lib64/libnsl-2.3.4.so
0000003fbbe15000      4K rw--- /lib64/libnsl-2.3.4.so
0000003fbbe16000      8K rw---    [ anon ]
0000007fbffde000    136K rwx--    [ stack ]
ffffffffff600000      4K r-x--    [ anon ]
total          1276452KNotice "total 1276452K"
So you saying non SGA/PGA would be 1276452 - 1052672?
That would be too much... yet if pmap another process, almost all flags (hex column) but [ stack ] are the same....
So how to tell which of those are shared and which are "exclusive" to the process, i.e: The "some extra just in case" mem...
thanks

Sga&pga

Hi all;
i wanna learn something about sga and pga... I have r11 instance on linux and db version is 10.2.0.3...Let say my sga=5 Gb and pga is=3gb...my server has 20gb ram...when i look my usage by top command and i see that:
Mem: 20550320k total, 20491732k used why linux allocate all those area?
i have 20 Gb ram and sga+pga=8 soo which oracle process use 12 Gb?
and advicer gives me adivice about SGA... it offers 10 Gb SGA... if i rise my sga what is my benefit? what it would change?
thanks alot

Hi hussien;
Thanks for again answers and help
You need to identify what other processes are running on this node. For example, if you have CM running on the database tier node, then it is expected to find more memory allocated. You can simply stop all the services on the server and start it one by one, and each time and keep an eye on the allocated memory.Its my mistake, coz i talked wiht my client and they said me they are working on this machine and thatswhy i had this memory usage.. sory for this mistake again (but your post helped me alot,coz i asked them what they are doing for a now ,and they gave me that answer :),thanks for leading)
Since you are on 10g, I would suggest you also go through the following document.
Note: 295626.1 - How To Use Automatic Shared Memory Management (ASMM) In Oracle10g
https://metalink2.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=295626.1
If you still have any queries, please feel free to post it here.Thanks for note.. i am reading it and its soo usefull for me, thanks for sharing your knowledge here wiht us hussein..
you are an oracle angle :)
regards
Helios
Edited by: helios on 12.May.2009 06:58

Oracle SGA components manual allocation

All,
Phyical memory : 420G My database version : 11.2.0.3 running on linux machine.
Memory_target = 200G . I would like to allocate this value to following SGA components. I don't want to automatic memory management enabled. Can you please guide me how to split 200G for following components. Is there any percentage for each components ?
db_cache_size
db_recycle_cache_size
db_keep_cache_size
large_pool_size
java_pool_size
shared_pool_size
pga_aggregate_target
streams_pool_size
log_buffer
Thanks

There is no 'default' settings for the components. Oracle tell you, when you create a database with DBCA, that the values provided by that tool are for a sample database and you should tune them to how you see fit.
This is what I would do (assuming this is a test environment, of course):
- If you're using HugePages, disable it.
- Run with AMM but give some key components a 'minimum' value (such as SGA, PGA, shared_pool, etc) so it's not too crazy. Setting everything at 0 can have performance issues with some databses, strangely.
- Run an entire workload cycle (day, week, etc) - enough batch processing to mimic a realistic workload on Production
- Check out the dynamic views/AWR reports to see what the database advises with the various components.
- If you want to use HugePages, then set the SGA and PGA to whatever you've determined from the AWR reports. You can choose whether to specify minimum values for the SGA components.
- If you're not using HugePages, you really should use AMM. What I do is give the SGA and PGA minimum values and allow the database to decide which one gets the 'extra' memory that's left over. That way, the SGA doesn't drop to an impossibly small size and cause everything to crap out.
Mark

Reg:-SGA & PGA Memory Allocation Size

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