How to troubleshoot ORA-04031 error?

I'm getting ORA-04031 errors such as the this one:
ORA-04031: unable to allocate 264 bytes of shared memory ("shared pool","unknown object","PCUR^a9c5b70f","kglob")
Here is the server's information:
OS: RHEL
MEMORY: 48 GB
There is another database on the same server.
Here is the information about the database which has the ORA-04031 errors:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
Database size (sum of datafiles) is about 2 GB.
SGA_TARGET = 0
SGA_MAX_SIZE = 224M -- Since SGA_TARGET = 0, does SGA_MAX_SIZE still control the maximum size of SGA?
SHARED_POOL_SIZE = 128M
SHARED_POOL_RESERVED_SIZE = 6710886
LOG_BUFFER = 4890624
LARGE_POOL_SIZE = 0
DB_CACHE_SIZE = 64M
DB_BLOCK_SIZE = 8192
JAVA_POOL_SIZE = 24M
SESSION_CACHED_CURSORS = 50
STATISTICS_LEVEL = TYPICAL
MEMORY_TARGET = 0
MEMORY_MAX_TARGET = 0
CPU_COUNT = 16
SQL AREA has 57% GETHITRATIO, 39939 RELOADS, and 1885 INVALIDATIONS.
Should I just increase SHARED_POOL_SIZE?
Thanks for any help.

is your post or mine more understandable?
SHARED_POOL_SIZE_FOR_ESTIMATE SHARED_POOL_SIZE_FACTOR ESTD_LC_SIZE ESTD_LC_MEMORY_OBJECTS ESTD_LC_TIME_SAVED ESTD_LC_TIME_SAVED_FACTOR ESTD_LC_LOAD_TIME ESTD_LC_LOAD_TIME_FACTOR ESTD_LC_MEMORY_OBJECT_HITS
                          124                   .7561            6                    526             342198                      .991              3331                  16.0918                     705799
                          144                    .878           26                   2018             343203                     .9939              2326                  11.2367                    2162766
                          164                       1           46                   3297             345322                         1               207                        1                    2177631
                          184                   1.122           66                   4698             345433                    1.0003                96                    .4638                    2179067
                          204                  1.2439           86                   6164             345438                    1.0003                91                    .4396                    2179314
                          224                  1.3659          101                   7094             345440                    1.0003                89                      .43                    2179379
                          244                  1.4878          104                   7324             345440                    1.0003                89                      .43                    2179379
                          264                  1.6098          104                   7324             345440                    1.0003                89                      .43                    2179379
                          284                  1.7317          104                   7324             345440                    1.0003                89                      .43                    2179379
                          304                  1.8537          104                   7324             345440                    1.0003                89                      .43                    2179379
                          324                  1.9756          104                   7324             345440                    1.0003                89                      .43                    2179379
                          344                  2.0976          104                   7324             345440                    1.0003                89                      .43                    2179379
12 rows selected.
SQL>

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by quan wang:
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<agents count="1382">
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SQL> select * from v$version;
BANNER
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2 ;
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ERROR at line 1:
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ORA-04031: unable to allocate 3840 bytes of shared memory ("shared pool","unknown object","sga heap(1,0)","kglsim object batc
h")
Thanks
PrakashEdited by: prakashdba on Jan 10, 2009 12:31 AM
Edited by: prakashdba on Jan 10, 2009 4:10 AM

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error 12801 in STREAMS process
ORA-12801: error signaled in parallel query server P000
ORA-04031: unable to allocate 104 bytes of shared memory ("streams pool","unknown object","apply shared t","knalfGetTxn:lcr")
OPIRIP: Uncaught error 447. Error stack:
ORA-00447: fatal error in background process
ORA-12801: error signaled in parallel query server P000
ORA-04031: unable to allocate 104 bytes of shared memory ("streams pool","unknown object","apply shared t","knalfGetTxn:lcr")
Can you please help to provide details on that how i can fix this problem permanetely.
Any suggestions would be great!
Thanks,
Nick

It seems that you are using Oracle database and not Berkeley Database.
To fix ORA-04031 errors on streams pool, you need to increase streams pool size with
alter system set streams_pool_size=<the right value>;See recommandations in http://download.oracle.com/docs/cd/B19306_01/server.102/b14229/strms_mprep.htm#i1006278

Diagnosing ORA-04031 on Oracle9iR2

Hi
We're running an Oracle9iR2 (9.2.0.6) database on Red Hat Enterprise Linux 4.0 (IA32). The database is used for development and testing. It's been running ok until recently users started getting the following error when trying to connect to the database:
ORA-04031: unable to allocate 17168 bytes of shared memory ("shared pool","unknown object","sga heap(1,0)","session param values")
What's changed during the last weeks is that we've installed Oracle10gR2 and the Oracle Calendar server on the machine, and added a about 10-20 new user accounts.
The server was originally running in dedicated server mode until i noticed there were 115 Oracle processes running on the server at one moment. The database typically has large number of connections which are idle most of the time. I changed it to shared server mode in order to avoid the overhead of having lots of server processes which are doing nothing most of the time.
I also increased the shared_pool_size and large_pool_size on the server but i'm still seeing ORA-04031 errors in trace files. How do i determine whether the cause is shared or large pool? How do i determine the right sizes for these pools? The traces include heap dumps for large pool.
The SQL query appearing in the trace files cursor name section is just one type of SQL query in most of the cases. How can i debug shared memory usage for a particular SQL query so that i can try and modify it to a more memory economic direction?
br. aspa

Hi,
If you have access to metalink, I advise you to read 146599.1 Diagnosing and Resolving Error ORA-04031.
The SQL query appearing in the trace files cursor name section is just one type of SQL
query in most of the cases. How can i debug shared memory usage for a particular SQL
query so that i can try and modify it to a more memory economic direction?The following SQL can show you statements with literal values or candidates to include bind variables:
SELECT substr(sql_text,1,40) "SQL",
count(*) ,
sum(executions) "TotExecs"
FROM v$sqlarea
WHERE executions < 5
GROUP BY substr(sql_text,1,40)
HAVING count(*) > 30
ORDER BY 2;Note: The number "30" in the having section of the statement can be adjusted as needed to get more detailed information.
There is a fixed table called x$ksmlru that tracks allocations in the shared pool that cause other objects in the shared pool to be aged out. This fixed table can be used to identify what is causing the large allocation.
SELECT * FROM X$KSMLRU WHERE ksmlrsiz > 0;Note : This view can only be queried by connected as the SYS.
How have you RAM ?
Since your last install, perhaps your RAM is not sufficient any more ?
Check your memory occupation.
Nicolas.
How do i determine whether the cause is shared or large pool? If there is no free memory into large pool left when a request is made then an ORA-4031 will be signalled similar to this : ORA-04031: unable to allocate XXXX bytes of shared memory
("large pool","unknown object","session heap","frame")
Message was edited by:
N. Gasparotto

How to troubleshoot ORA-04031 error?

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