Oracle 11G consuming more memory

Dear experts,
I have upgraded oracle 10 to 11 as one of my project.
After upgrading the 11G is consuming more OS level resources. almost 15GB ram whith out any load.
I would like to know what is the minimal usage of 11G at os level.
thanks in advance.
Regards,
shiva P

For a old version of BW system with Oracle 11G, not sure how much your system is loaded.
However, you can always try to optimize resource available. If your memory is less, you need to add swap space and monitor it's usage.
Check for BW specific parameters.
1431798 - Oracle 11.2.0: Database Parameter Settings
180605 - Oracle database parameter settings for BW
1013912 - FAQ: Oracle BW performance
Divyanshu

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Hi,
Yes, could be hardware performance issue. Try recycle the Transport process and see if the issue persists.
Thanks,
Simon Wu
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How can i found which program consume more memory in server

Dear Experts,
please do needful on below issue
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Hi,
please do needful on below issue
For the same, I suppose ?
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Oracle 11g AMM (Automatic Memory Management)

Hi All,
I have a very powerful server 24 Processors with 6 cores each and 74 GB RAM for my production database. The server will host only one production database. I wanted to use AMM for this database and allocate maximum memory to Oracle by setting memory_target. By default /dev/shm is set 37 GB but I wanted to increase it least 55 GB. I know I can get this changed by my system admin but I wanted to know how much memory should leave for OS?
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Thanks,
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From MOS ID 169706.1
Automatic Memory Management
Starting with Oracle Database 11g, the Automatic Memory Management feature requires more shared memory (/dev/shm) and file descriptors. The shared memory should be sized to be at least the greater of MEMORY_MAX_TARGET and MEMORY_TARGET for each Oracle instance on the computer. To determine the amount of shared memory available, enter the following command: # df -k /dev/shm/
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FBL3N consumes more memory

Hi all,
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Hi Munur,
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SQL consuming more memory without any process

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SQL is consuming 95% of physical memory with out any process in SQL Server.How to overcome this problem.
Details:-
SQL 2008 64 bit in WIndow server 2008 SP2.
Thanks
Selva

Hi experts,
SQL is consuming 95% of physical memory with out any process in SQL Server.How to overcome this problem.
This is not a problem unless you show me Out of memory error.
Use following counters to set correct value for max server memory.
You should refer to perfmon counters to get estimate of memory utilized by SQL Server and then set accurate value
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SQLServer:Buffer Manager--Page Life Expectancy(PLE):
SQLServer:Buffer Manager--CheckpointPages/sec
SQLServer:Memory Manager--Memory Grants Pending:
SQLServer:memory Manager--Target Server Memory:
SQLServer:memory Manager--Total Server memory
Please read below article for details about this counter
http://social.technet.microsoft.com/wiki/contents/articles/22316.sql-server-memory-and-troubleshooting.aspx#Does_my_system_have_low_memory
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it.
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Which is better to install Oracle 11g database based on ASM or Filesystem

We will install 2 sets of Oracle 11.2.0.3 on Redhat Linix 5.6 and configure Data Guard for them further -- one will be a primary DB server, the other will be a physical standby DB server. The Oracle DB stoage is based on SAN Array Disk with 6TB size. Now there are two options to manage the DB datafiles:
1. Install Oracle ASM
2. Create the tranditional OS filesystem
Which is better? in the past, our 10g data guard environment is not based on Oracle ASM.
Someone think if we adopt the oracle ASM, the shortcomings are :
1. as there is one more instance that will consume more memory and resource.
2. as the ASM file system cannot be shown out on the OS level directly such as "df" command, the disk utilization monitor job will be more difficult. at least it cannot be supervised at OS level.
3. as the DB bshoule be done the daily incremental backup (Mon-Sat) to Local Backup Drive. the bakup job must be done by RMAN rather than user-managed script.
Who can provide some advices? Thanks very much in advance.

user5969983 wrote:
We will install 2 sets of Oracle 11.2.0.3 on Redhat Linix 5.6 and configure Data Guard for them further -- one will be a primary DB server, the other will be a physical standby DB server. The Oracle DB stoage is based on SAN Array Disk with 6TB size. Now there are two options to manage the DB datafiles:
1. Install Oracle ASM
2. Create the tranditional OS filesystem
Which is better? in the past, our 10g data guard environment is not based on Oracle ASM. ASM provides a host of new features ito data management, and performance - to the extent that you can rip out the entire existing storage system, replace it with a brand new storage system, without a single second of database downtime.
Someone think if we adopt the oracle ASM, the shortcomings are :
1. as there is one more instance that will consume more memory and resource.Not really relevant on 64bit h/w architecture that removes limitations such a 4GB of addressable memory. On the CPU side... heck, my game PC at home has a 8 core 64bit CPU. Single die and dual core CPUs belong to the distant past.
Arguing that an ASM instance has overheads would be silly. And totally ignores the wide range of real and tangible benefits that ASM provides.
2. as the ASM file system cannot be shown out on the OS level directly such as "df" command, the disk utilization monitor job will be more difficult. at least it cannot be supervised at OS level.That is a A Very Good Thing (tm). Managing database storage from o/s level is flawed in many ways.
3. as the DB bshoule be done the daily incremental backup (Mon-Sat) to Local Backup Drive. the bakup job must be done by RMAN rather than user-managed script.
rman supports ASM fully.
I have stopped using cooked file systems for Oracle - I prefer ASM first and foremost. The only exceptions are tiny servers with a single root disk that needs to be used for kernel, database s/w, and database datafiles. (currently these are mostly Oracle XE systems in my case, and configured that way as XE does not support ASM and is used as a pure cost decision).

Oracle 11g R2 - AWR Section UnOptimized Read Reqs / Optimized Read Reqs

Hello guys,
using Oracle 11g R2 more and more i have checked out the new AWR and its sections.
I have found some section lke this
SQL ordered by Physical Reads (UnOptimized)DB/Inst: SID/sid Snaps: 20296-202
-> UnOptimized Read Reqs = Physical Read Reqts - Optimized Read Reqs
-> %Opt   - Optimized Reads as percentage of SQL Read Requests
-> %Total - UnOptimized Read Reqs as a percentage of Total UnOptimized Read Reqs
-> Total Physical Read Requests:         151,508
-> Captured SQL account for   25.3% of Total
-> Total UnOptimized Read Requests:         151,508
-> Captured SQL account for   25.3% of Total
-> Total Optimized Read Requests:               1
-> Captured SQL account for    0.0% of TotalWhat the heck is "Optimized Read Reqs" and "UnOptimized Read Reqs"? These terms are used very often right now in AWR of Oracle 11g R2.
Does anyone know what this term means and how it is defined? Don't find any information on web and documentation.
Thanks guys!

Hello,
If my guess is close than "Buffer Hit" (Instance Efficiency Percentages) could be as low as 0% from this report.No it isn't ... check it here:
Instance Efficiency Percentages (Target 100%)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
            Buffer Nowait %:   99.96       Redo NoWait %: 100.00
            Buffer Hit   %:   99.50    In-memory Sort %: 100.00
            Library Hit   %:   99.09        Soft Parse %:   89.55
         Execute to Parse %:   95.93         Latch Hit %:   98.93
Parse CPU to Parse Elapsd %:   68.68     % Non-Parse CPU:   98.81Sometimes i wonder why oracle introduces such new terms / measurements without documenting it.
Regards

/dev/shm on Oracle Linux 6.x to run Oracle 11g R2 - manual configuration?

Hello
We are building a server to run Oracle 11g R2 database (11.2.0.3 x64) on Oracle Linux 6.2 with UEK R2.
Our preference is to use AMM to have Oracle 11g R2 manage memory. We may impose some minium SGA and PGA memory allocations but basically aim to use MEMORY_TARGET to manage overall memory.
By default Linux makes the size of /dev/shm ~50% of server physical RAM, as far as I can tell.
Here is the /etc/fstab entry created by the installation:
tmpfs /dev/shm tmpfs defaults 0 0
Given this Linux server will only run Oracle 11g R2 database and some monitoring software, almost application code will run on the server. The application code will run on the separate application server and is Java based.
Can I change the */etc/fstab* entry for /dev/shm to manually increase the size to take up ~80-90% of the server physical RAM ? Is it a good idea?
The server is 64-bit, the RAM = 64 GB, so I am thinking to manually make /dev/shm to be = ~55GB, leaving ~8GB for other purposes.
Right now it's about 32GB (50%?) if I leave the /dev/shm 'defaults' on.
many thanks

thanks,
I have read the doc (what little there is on this topic).
I have asked on the database forum......
just FYI - below is the proof:
SQL> show parameter mem
NAME                    TYPE     VALUE
hi_shared_memory_address     integer     0
memory_max_target          big integer 4G
memory_target          big integer 0
shared_memory_address     integer     0
SQL> show parameter ga
NAME                    TYPE     VALUE
lock_sga               boolean     FALSE
pga_aggregate_target          big integer 1600M
pre_page_sga          boolean     FALSE
sga_max_size          big integer 3G
sga_target               big integer 1600M
still does not work.
And I cant change memory_max_target = 0 because I get error on startup:
SQL> alter system set memory_max_target=0 scope=spfile;
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup;
ORA-01078: failure in processing system parameters
ORA-00843: Parameter not taking MEMORY_MAX_TARGET into account
ORA-00849: SGA_TARGET 3221225472 cannot be set to more than MEMORY_MAX_TARGET 0.
BUT if memory_max_target is > 0 then alert log says hugepages can not be used
it feels like catch-22.....
thanks
Edited by: yurib on Jun 1, 2012 4:53 PM

How to know the amount of ora 11g page-out memory (sga and pga)?

How to know the amount of oracle 11g page-out memory ( sga and pga) in the SunSolaris 10 Unix and Linux.
I need to know how many oracle memory are being page-out ( all and for a one oracle server process).
thanks

You can monitor the paging with vmstat or sar commands.
http://download.oracle.com/docs/cd/B28359_01/server.111/b32009/tuning.htm#sthref500
You can also get the paging information on OEM home page if configured for your database.
But I don't know if there exists a method with which one can find out how much memory per session/server process is getting paged out.

The danger of memory target in Oracle 11g - request for discussion.

Hello, everyone.
This is not a question, but kind of request for discussion.
I believe that many of you heard something about automatic memory management in Oracle 11g.
The concept is that Oracle manages the target size of SGA and PGA. Yes, believe it or not, all we have to do is just to tell Oracle how much memory it can use.
But I have a big concern on this. The optimizer takes the PGA size into consideration when calculating the cost of sort-related operations.
So what would happen when Oracle dynamically changes the target size of PGA? Following is a simple demonstration of my concern.
UKJA@ukja116> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Production
PL/SQL Release 11.1.0.6.0 - Production
CORE    11.1.0.6.0      Production
TNS for 32-bit Windows: Version 11.1.0.6.0 - Production
NLSRTL Version 11.1.0.6.0 - Production
-- Configuration
*.memory_target=350m
*.memory_max_target=350m
create table t1(c1 int, c2 char(100));
create table t2(c1 int, c2 char(100));
insert into t1 select level, level from dual connect by level <= 10000;
insert into t2 select level, level from dual connect by level <= 10000;
-- First 10053 trace
alter session set events '10053 trace name context forever, level 1';
select /*+ use_hash(t1 t2) */ count(*)
from t1, t2
where t1.c1 = t2.c1 and t1.c2 = t2.c2
alter session set events '10053 trace name context off';
-- Do aggressive hard parse to make Oracle dynamically change the size of memory segments.
declare
pat1     varchar2(1000);
pat2     varchar2(1000);
va       number;
vc       sys_refcursor;
vs        varchar2(1000);
begin
select ksppstvl into pat1
    from sys.xm$ksppi i, sys.xm$ksppcv v   -- views for x$ table
    where i.indx = v.indx
    and i.ksppinm = '__pga_aggregate_target';
for idx in 1 .. 10000000 loop
    execute immediate 'select count(*) from t1 where rownum = ' || (idx+1)
          into va;
    if mod(idx, 1000) = 0 then
      sys.dbms_system.ksdwrt(2, idx || 'th execution');
      select ksppstvl into pat2
      from sys.xm$ksppi i, sys.xm$ksppcv v   -- views for x$ table
      where i.indx = v.indx
      and i.ksppinm = '__pga_aggregate_target';
      if pat1 <> pat2 then
        sys.dbms_system.ksdwrt(2, 'yep, I got it!');
        exit;
      end if;
    end if;
end loop;
end;
-- As to alert log file,
25000th execution
26000th execution
27000th execution
28000th execution
29000th execution
30000th execution
yep, I got it! <-- the pga target changed with 30000th hard parse
-- Second 10053 trace for same query
alter session set events '10053 trace name context forever, level 1';
select /*+ use_hash(t1 t2) */ count(*)
from t1, t2
where t1.c1 = t2.c1 and t1.c2 = t2.c2
alter session set events '10053 trace name context off';With above test case, I found that
1. Oracle invalidates the query when internal pga aggregate size changes, which is quite natural.
2. With changed pga aggregate size, Oracle recalculates the cost. These are excerpts from the both of the 10053 trace files.
-- First 10053 trace file
PARAMETERS USED BY THE OPTIMIZER
PARAMETERS WITH ALTERED VALUES
Compilation Environment Dump
_smm_max_size                       = 11468 KB
_smm_px_max_size                    = 28672 KB
optimizer_use_sql_plan_baselines    = false
optimizer_use_invisible_indexes     = true
-- Second 10053 trace file
PARAMETERS USED BY THE OPTIMIZER
PARAMETERS WITH ALTERED VALUES
Compilation Environment Dump
_smm_max_size                       = 13107 KB
_smm_px_max_size                    = 32768 KB
optimizer_use_sql_plan_baselines    = false
optimizer_use_invisible_indexes     = true
Bug Fix Control Environment10053 trace file clearly says that Oracle recalculates the cost of the query with the change of internal pga aggregate target size. So, there is a great danger of unexpected plan change while Oracle dynamically controls the memory segments.
I believe that this is a desinged behavior, but the negative side effect is not negligible.
I just like to hear your opinions on this behavior.
Do you think that this is acceptable? Or is this another great feature that nobody wants to use like automatic tuning advisor?
================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================

I made a slight modification with my test case to have mixed workloads of hard parse and logical reads.
*.memory_target=200m
*.memory_max_target=200m
create table t3(c1 int, c2 char(1000));
insert into t3 select level, level from dual connect by level <= 50000;
declare
pat1     varchar2(1000);
pat2     varchar2(1000);
va       number;
begin
select ksppstvl into pat1
    from sys.xm$ksppi i, sys.xm$ksppcv v
    where i.indx = v.indx
    and i.ksppinm = '__pga_aggregate_target';
for idx in 1 .. 1000000 loop
    -- try many patterns here!
    execute immediate 'select count(*) from t3 where 10 = mod('||idx||',10)+1' into va;
    if mod(idx, 100) = 0 then
      sys.dbms_system.ksdwrt(2, idx || 'th execution');
      for p in (select ksppinm, ksppstvl
          from sys.xm$ksppi i, sys.xm$ksppcv v
          where i.indx = v.indx
          and i.ksppinm in ('__shared_pool_size', '__db_cache_size', '__pga_aggregate_target')) loop
          sys.dbms_system.ksdwrt(2, p.ksppinm || ' = ' || p.ksppstvl);
      end loop;
      select ksppstvl into pat2
      from sys.xm$ksppi i, sys.xm$ksppcv v
      where i.indx = v.indx
      and i.ksppinm = '__pga_aggregate_target';
      if pat1 <> pat2 then
        sys.dbms_system.ksdwrt(2, 'yep, I got it! pat1=' || pat1 ||', pat2='||pat2);
        exit;
      end if;
    end if;
end loop;
end;
/This test case showed expected and reasonable result, like following:
100th execution
__shared_pool_size = 92274688
__db_cache_size = 16777216
__pga_aggregate_target = 83886080
200th execution
__shared_pool_size = 92274688
__db_cache_size = 16777216
__pga_aggregate_target = 83886080
300th execution
__shared_pool_size = 88080384
__db_cache_size = 20971520
__pga_aggregate_target = 83886080
400th execution
__shared_pool_size = 92274688
__db_cache_size = 16777216
__pga_aggregate_target = 83886080
500th execution
__shared_pool_size = 88080384
__db_cache_size = 20971520
__pga_aggregate_target = 83886080
1100th execution
__shared_pool_size = 92274688
__db_cache_size = 20971520
__pga_aggregate_target = 83886080
1200th execution
__shared_pool_size = 92274688
__db_cache_size = 37748736
__pga_aggregate_target = 58720256
yep, I got it! pat1=83886080, pat2=58720256Oracle continued being bounced between shared pool and buffer cache size, and about 1200th execution Oracle suddenly stole some memory from PGA target area to increase db cache size.
(I'm still in dark age on this automatic memory target management of 11g. More research in need!)
I think that this is very clear and natural behavior. I just want to point out that this would result in unwanted catastrophe under special cases, especially with some logic holes and bugs.
================================
Dion Cho - Oracle Performance Storyteller
http://dioncho.wordpress.com (english)
http://ukja.tistory.com (korean)
================================

Oracle 11g - Memory used for sorting

Hi everyone,
I would like to know how I could analyze memory used for sorting in Oracle 11g. When I run the below query, it returns 1531381.
select value from v$sysstat where name like 'sorts (memory)';But when I check sort_area_size parameter from v$parameter, it returns 65536. Does it mean my database is using more memory for sorting than sort_area_size. Or is the way I interpret v$sysstat view and sort_area_size wrong? What is the best way to monitor the memory usage for sorting? Thanks in advance.
Regards,
K.H
Edited by: K Hein on Apr 5, 2012 8:16 PM

check the valuse of pga_aggregate_target
http://docs.oracle.com/cd/B19306_01/server.102/b14237/initparams157.htm
Note:
Oracle does not recommend using the SORT_AREA_SIZE parameter unless the instance is configured with the shared server option. Oracle recommends that you enable automatic sizing of SQL working areas by setting PGA_AGGREGATE_TARGET instead. SORT_AREA_SIZE is retained for backward compatibility.
What is the best way to monitor the memory usage for sorting? try v$sort_usage
or v$tempseg_usage
col sid_serial for a44
col size for a22
col SID_SERIAL for a22
SELECT b.tablespace,
        ROUND(((b.blocks*p.value)/1024/1024),2)||' MB' "SIZE",
        a.sid||','||a.serial# SID_SERIAL,
        a.username,a.osuser,
        a.program
   FROM sys.v_$session a,
        sys.v_$sort_usage b,
        sys.v_$parameter p
WHERE p.name = 'db_block_size'
    AND a.saddr = b.session_addr
ORDER BY b.blocks;

Oracle taking more memory ?

hi
i have oracle running on solaris, sga set to 3 gb but below command showing multiple process for PRDLIVE
and taking more memory than 3GB in total, .... occasionally i see oracle shutting down due to out of memory issue ...
ps -eo pid,pmem,vsz,rss,comm | sort -rnk2 | head
18688 11.4 3381200 1859272 oraclePRDLIVE
18649 11.4 3377664 1847864 oraclePRDLIVE
18557 9.6 3377392 1553744 ora_w000_PRDLIVE
18555 9.6 3377272 1550384 ora_smco_PRDLIVE
18703 9.2 2058304 1489584 oracleTEST
14420 9.2 2065448 1494536 oracleTEST
14414 9.2 2061368 1485776 oracleTEST
18690 9.1 2052264 1483248 oracleTEST
18584 9.1 2050200 1480608 ora_w000_TEST
18515 8.1 3387888 1310160 oraclePRDLIVE
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Solaris: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
cat /etc/release
Oracle Solaris 10 8/11 s10s_u10wos_17b SPARC
Copyright (c) 1983, 2011, Oracle and/or its affiliates. All rights reserved.
Assembled 23 August 2011
PMON (ospid: 19876): terminating the instance due to error 490
ORA-04030: out of process memory when trying to allocate 4088 bytes (PLS CGA hp,pdz2M87_Allocate_Permanent)

user9182826 wrote:
hi
i have oracle running on solaris, sga set to 3 gb but below command showing multiple process for PRDLIVE
and taking more memory than 3GB in total, .... occasionally i see oracle shutting down due to out of memory issue ...
ps -eo pid,pmem,vsz,rss,comm | sort -rnk2 | head
18688 11.4 3381200 1859272 oraclePRDLIVE
18649 11.4 3377664 1847864 oraclePRDLIVE
18557 9.6 3377392 1553744 ora_w000_PRDLIVE
18555 9.6 3377272 1550384 ora_smco_PRDLIVE
18703 9.2 2058304 1489584 oracleTEST
14420 9.2 2065448 1494536 oracleTEST
14414 9.2 2061368 1485776 oracleTEST
18690 9.1 2052264 1483248 oracleTEST
18584 9.1 2050200 1480608 ora_w000_TEST
18515 8.1 3387888 1310160 oraclePRDLIVE
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Solaris: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
cat /etc/release
Oracle Solaris 10 8/11 s10s_u10wos_17b SPARC
Copyright (c) 1983, 2011, Oracle and/or its affiliates. All rights reserved.
Assembled 23 August 2011
PMON (ospid: 19876): terminating the instance due to error 490
ORA-04030: out of process memory when trying to allocate 4088 bytes (PLS CGA hp,pdz2M87_Allocate_Permanent)04030, 00000, "out of process memory when trying to allocate %s bytes (%s,%s)"
// *Cause: Operating system process private memory was exhausted.
Oracle is victim; not the culprit.
Problem is at OS level & fix must be done at OS level.

Oracle 11G consuming more memory

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