Tuesday, January 10, 2012

You want to participate in Oracle Beta program or Exam?

Oracle Technology Beta programs available for all Oracle technology products including Oracle Database, Oracle Enterprise manager, Oracle Fusion Middleware…etc.

Please note that Beta program is highly selective and acceptance into these programs makes you part of an elite group of test sites that are carefully selected based up on technical expertise and knowledge of Oracle productions

Why should you participate?

The main benefit is gaining access to technology before your competitors and developing a close working relationship with oracle development.

If you want to participate in Oracle beta program, please register yourself using below link.

You can also contact BETAPROG_US@ORACLE.COM for details

You can also participate in Oracle Certification Beta exams. These Beta exams are pre-production exams used by Oracle to evaluate new exam questions and it will go through a rigorous development and evaluation process before being released to the public.

Beta exams are offered at a deeply discounted price and exam usually takes around 3 to 3.5 hours to complete.

To learn more information about Beta Exams, please visit

Satishbabu Gunukula

Monday, January 9, 2012

How to STOP and START processes in Oracle RAC and Log Directory Structure

You need to follow the below steps to Stop and Start processes in Oracle RAC

Shutdown RAC Database
You need to Shutdown Database instances on each node. You can either use Oracle Enterprise Manager or SVRCTL to shutdown the instances. If you are using EM Grid control then set a blackout in Grid control for processes that you intend to shutdown. So that records for these processes indicate that the shutdown was planned.
Use below command to stop Enterprise Manager/Grid Control
$ORACLE_HOME/bin/emctl stop dbconsole

Use below command to shutdown all oracle RAC instances on all nodes.
$ ORACLE_HOME/bin/srvctl stop database -d db_name

If you want to stop specific database instances use below command
$ ORACLE_HOME/bin/srvctl stop database -d db_name –i instance_name

Shutdown Oracle ASM Instance
Once the database is stopped, proceed with ASM Instance shutdown.
Use below command to shutdown ASM instances on all nodes
$ORACLE_HOME/bin/bin/srvctl stop asm -n node

Shutdown Node applications
Use below command to shutdown node apps on all RAC nodes
$ORACLE_HOME/bin/bin/srvctl stop nodeapps -n node

Shutdown Oracle Clusterware
You need to Shutdown oracle clusterware or CRS as root and run below command on each node in the cluster.
#crsctl stop crs

Please note that using above command will stop Oracle High availability services (OHAS) and Clustware stack in a single command

From 11g R2, you can do this in two stops

1. Stop Clustwerware stack on local node
#crsctl stop cluster

You can stop the clusterware stack on all nodes in the cluster
# Crsctl stop cluster –all

-all Start clusterware on all nodes
-n Start clusterware on particular nodes

2. Stop Oracle High availability service demon on each node in the cluster.
# crsctl stop has

Check the Status of Cluster
Once all process stopped run the below command to check the status of CRSD,CSSD,EVMD process.
# crsctl check crs

If you see any process failed to stop then you can also use Force option to terminate the processes unconditionally.
$ crsctl stop crs –all –f

Start processes in Oracle RAC
Follow the reverse sequence to start all processes in oracle RAC
# crsctl start crs
$ORACLE_HOME/bin/bin/srvctl start nodeapps -n node
$ORACLE_HOME/bin/bin/srvctl start asm -n node
$ORACLE_HOME/bin/srvctl start database -d db_name

If you come across any issues during startup orshutdown, check the Oracle Clusterware Component Log Files.

Oracle Clusterware Log Directory Structure

CRS_HOME/log/hostname/crsd/ - The log files for the CRS daemon CRS_HOME/log/hostname/cssd/ - The log files for the CSS daemon
CRS_HOME/log/hostname/evmd/ - The log files for the EVM daemon
CRS_HOME/log/hostname/client/ - The log files for the Oracle Cluster Registry (OCR)
CRS_HOME/log/hostname/racg/ - The log files for the Oracle RAC high availability component
CRS_HOME/log/hostname/racg/ - The log files for the Oracle RAC high availability component
CRS_HOME/log/hostanme/alert.log – The alert.log for Clusterware issues.

Please note that the CRS_HOME is the directory in which the Oracle Clusterware software was installed and hostname is the name of the node

Satishbabu Gunukula

RMAN-06900: WARNING: unable to generate V$RMAN_STATUS or V$RMAN_OUTPUT row

One of my RMAN backup generated below Warnings, here is the detailed description and solution. I hope it helps other users.


RMAN-06900: WARNING: unable to generate V$RMAN_STATUS or V$RMAN_OUTPUT row
RMAN-06901: WARNING: disabling update of the V$RMAN_STATUS and V$RMAN_OUTPUT rows
ORACLE error from target database:
ORA-00604: error occurred at recursive SQL level 3
ORA-04031: unable to allocate 4120 bytes of shared memory ("shared pool","select name,password,datats#...","Typecheck","kgghteInit")
ORA-06508: PL/SQL: could not find program unit being called: "SYS.DBMS_BACKUP_RESTORE"

Cause & Solution:

The RMAN not able to update V$RMAN_STATUS or V$RMAN_OUTPUT due to associated error message. When you receive RMAN-06900 and RMAN-06901error, you need to look for associated error messages to find the root cause of the error message.

In this case, ORA-04031 is the associated error message

ORA-04031: unable to allocate 4120 bytes of shared memory
*Cause: More shared memory is needed than was allocated in the shared pool.
*Action: If the shared pool is out of memory, either use the dbms_shared_pool package to pin large packages, reduce your use of shared memory, or increase the amount of available shared memory by increasing the value of the INIT.ORA parameters "shared_pool_reserved_size" and “shared_pool_size". If the large pool is out of memory, increase the INIT.ORA parameter "large_pool_size".

I have seen many users complaining about error ORA-19921. If you receive this error close some of existing connections or unused RMAN connections.

If your oracle version > then you might be hitting below bugs. These bugs fixed in and higher versions.

ORA-19921: maximum number of 64 rows exceeded - oracle Bug 465973.
ORA-19921: maximum number of 128 rows exceeded - oracle Bug 8264365

Satishbabu Gunukula