Scripting to gather oracle info on a Linux box Finding rac/normal instance?

Question

Hello all,
I've been tasked by the disaster recovery team to get a little quick script for them to run, to see what oracle instances are on a box, if it is up, listener is running, etc.
So far, with normal, one node instances I've had success. I grab data from the /etc/oratab file, and parse it out with awk to get a ORACLE_SID and and ORACLE_HOME.
This script is run as the oracle user or a user in the dba group, so, that with each instance, I attempt a logon through SQL*Plus as connect / as sysdba and does a query to gather some instance information that I echo to the screen to establish that the instance is up and connectable.
The problem I have run into, is if there is an instance listed for a node of a RAC cluster....it doesn't see that entries to /etc/oratab are quite the same using dbca for RAC nodes as normal nodes.
For instance, say I have a cluster RAC which has nodes rac1 rac2 and rac3.
From what I'm seeing...on the individual nodes, in the /etc/oratab entries only seem to be put in for the cluster RAC, rather that say rac1. My script which tries to set the oracle sid and home and connect / as sysdba fails. If the entry were put in there as rac1, it should work, I'd think.
Can someone make suggestions for me to use with this script, so that I can find out what node instance is running, if RAC is on the computer...and automatically find and connect similar to how I'm doing with the single databases using /etc/oratab
Is there a similar file to /etc/oratab that is used by the clusterware on the system?
Thanks in advance,
cayenne
Edited by: cayenne on Apr 15, 2009 12:57 PM

Answer 1

S2K wrote:
please post your script here so we can see what exactly is going on...and help you point out stuff...Certainly...that might help indeed.
Here is the listing:
#! /bin/bash
#grab original path so as to reuse on each loop interation to ensure ONLY
# the oracle binaries from the proper oracle home are used.
old_path=$PATH
#set oracle_home/bin path for listener
#to guess best fit, hit first home that is bootable
#and not listed as ASM
#start as empty
listener_path=
if [ -e "/etc/oratab" ]
then
     #grab and clean the entries for oracle instances and their respective oracle homes
     oracle_instances=`cat /etc/oratab | sed '/#/d' | sed '/\*/d' | sed '/^$/d'`
     echo 'Testing connections to Oracle intances as listed in /etc/oratab'
     echo 'and testing connectivity, start times and status'
     echo '----------------------------------------------------------------------------------------------------'
     for oinstance in $oracle_instances;
     do
          oracle_sid=`echo $oinstance | awk -F":" '{print $1}'`
          oracle_home=`echo $oinstance | awk -F":" '{print $2}'`
          oracle_bootable=`echo $oinstance | awk -F":" '{print $3}'`
          echo
          echo 'Using ORACLE_HOME='$oracle_home
          echo
          export ORACLE_HOME=$oracle_home #set oracle home
          echo 'Setting ORACLE_SID='$oracle_sid
          echo
          export ORACLE_SID=$oracle_sid #set oracle sid
          echo 'Adding Oracle bin to path'
          echo
          echo '----------------------------------------------------------------------------------------------------'
          echo
          export PATH=$ORACLE_HOME/bin:$old_path #reset to old path plus new oracle home /bin
          #Test and set listener path
          # do I need this? to exclude asm for listener? && `expr match "$oracle_sid" \+ASM.*` = 0
          if [[ -z "$listener_path" && $oracle_bootable != "N" ]] #Test to see if listener path set yet, if not, is instance set bootable
          then
               listener_path=$oracle_home/bin:$old_path
          fi
          #Next, connect through sqlplus and query v$instance table to prove connectivity
          output= #Reset output for each iteration
          output=`sqlplus -s "/ as sysdba" <<EOF
          set heading off feedback off verify off
          select 'Instance Name='||instance_name||' Host='||host_name||' Start Time='||to_char (startup_time, 'HH:MI AM MON DD,YYYY')||' Status='||status from v\\$instance;
          exit
          EOF`
          echo 'Connection to Database returns message:'
          # If sqlplus fails, print error message
          echo
          if [[ -z "$output" || `expr match "$output" .*ORA-.*` > 0 ]]
          then
               echo 'Unable to conect and query database instance = '$oracle_sid
          else
               echo $output
               echo
               echo '----------------------------------------------------------------------------------------------------'
               echo
               echo 'Schemas on this Database Instance: '$oracle_sid
               echo
               if [[ `expr match "$oracle_sid" \+ASM.*` = 0 ]] #Test to see if an ASM instance
               then
                    #Hit sqlplus again, this time to grab and display a list of schema/usernames on this instance.
                    sqlplus -s "/ as sysdba" <<EOF
                    set heading off feedback off verify off pagesize 0
                    select username from dba_users order by username;
                    exit
EOF
               else
                    echo 'Instance '$oracle_sid' is an Auto Storage Management instance, no user schemas to report'
               fi #end test for ASM
          fi
          echo
          echo '----------------------------------------------------------------------------------------------------'
     done
     echo
     ###Look into what path is used here for the listener!!
     output=''
     echo 'Checking output for querying the Oracle Listener'
     echo
     if [[ -n "$listener_path" ]]
     then
          lsnrctl status
     else
          echo
          echo 'Oracle Home Not set to bootable path, cannot find path for listener'
     fi
     echo
     echo '----------------------------------------------------------------------------------------------------'
else
     echo '----------------------------------------------------------------------------------------------------'
     echo 'Unable to test connectivity to oracle database instances due to '
     echo 'the file /etc/oratab NOT being found on this system'
     echo '----------------------------------------------------------------------------------------------------'
fi #End if statement testing if /etc/oratab present
echo
echo 'Listing Oracle processes currently running on this box'
echo
ps -ef | grep oracle
echo
echo '----------------------------------------------------------------------------------------------------'
As I mentioned before, the problem comes when a RAC instance is in the /etc/oratab...apparently dbca puts in the RAC sid, not the node sid....and when my script tries to connect...it can't and throws the not started error.
See other email for details of the problem.
This is the script I'm working on....any suggestions greatly appreciated!!
cayenne