Significant Virtual Memory Paging on Linux When None is Occurring in ADDM Reports

There will be  Significant Virtual Memory Paging on Linux When None is Occurring in ADDM Reports.

There may be following message in the ADDM report:

From  the ADDM report

FINDING 1: 100% impact (48628 seconds)
--------------------------------------
Significant virtual memory paging was detected on the host operating system.

RECOMMENDATION 1: Host Configuration, 100% benefit (32719 seconds)
ACTION: Host operating system was experiencing significant paging but
no particular root cause could be detected. Investigate processes that
do not belong to this instance running on the host that are
consuming significant amount of virtual memory. Also consider adding more
physical memory to the host.

First, review the following bugs which incorrectly show large swapping statistics that may cause incorrect ADDM message as per
above message.  And if applicable, apply the bugs.

For 10.2.0.5,  for Linux:

Note:12347332.8 Bug 12347332 - V$OSSTAT / ADDM incorrectly shows very large swapping/paging stats

This bug is specific to Linux.  So download the patch for Linux:
Patch:12347332

For 11.2, there is the following bug:      

Note:10220118.8 Bug 10220118 - Print warning to alert log when system is swapping

If available for your os, download following patch:
Patch:10220118

Comments

Post a Comment

Popular posts from this blog

Installing DBMS_JAVA package in Oracle and calling UTL_DBWS web services through Oracle database

Installing DBMS_JAVA package in Oracle following  files need to be run:-  sql> select comp_name, version, status from dba_registry where comp_name like '%JAVA%'; @?/javavm/install/initjvm.sql; @?/xdk/admin/initxml.sql; @?/xdk/admin/xmlja.sql; @?/rdbms/admin/catjava.sql; @?/rdbms/admin/catexf.sql; and verify your java installation in Oracle Database  sql> select comp_name, version, status from dba_registry where comp_name like '%JAVA%'; sql> select dbms_java.longname(object_name), status, object_type from all_objects where       object_type = 'JAVA CLASS'; ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ calling  UTL_DBWS  web services through Oracle Database :-  set the follwing parameters in .bash_profile of oracle user  export JAVA_HOME=$ORACLE_HOME/jdk ORACLE_BASE=/opt/oracle/product; export ORACLE_BASE ORACLE_HOME=/opt/oracle/product/11.2.0/dbhome_1; exp...
Read more

Starting background process GTX4 and GLOBAL_TXN_PROCESSES

Starting background process GTX4 Tue Jan 01 15:51:12 2012 GTX4 started with pid=64, OS id=11122 Tue Jan 01 15:51:43 2012 Auto-tuning: Starting background process GTX5 and Auto-tuning: Shutting down background process GTXi Like messages in alert log in RAC database This event is recorded in RAC environment only, which is normal.    Its normal for the database to automatically tune the number of these processes based on the workload of XA global transactions. If any application which using XA transaction and connecting to oracle RAC database, is it required. This normal behavior and you do not have to worry about this error messages.  If you are sure that you are not using XA and want to stop these messages. You can disable the GTXn background processes, then you must set GLOBAL_TXN_PROCESSES to 0 in your parameter file. Setting this parameter to 0 will disable the XA support on an Oracle RAC database. GLOBAL_TXN_PR...
Read more

stick the job to the specific instance in Oracle RAC

First method ( and easy one too ) :- note:-  must perform this activity on each instance one by one. ......stop jobs which is assigning to the specific instance..... $ export ORACLE_SID=SID connect database using job owner .... $ sqlplus username/password list of jobs and its instance....  sql> select JOB,INSTANCE from user_jobs;        JOB   INSTANCE ---------- ----------       2510          0       2951          0       2992          0       3091          0       3111          0       1570          0       1567          0       1568          0       1569     ...
Read more