Bash shell script to exception when database has been shutdown

Question

Hi, I'm quite new in shell scripting. I created the below simple script to do a check on the database, it's a count so it works fine... if the database is there. Now I want to be able to catch if the database is or is not there, what I tried so far didn't work, can anybody please give me a hand with this?
The shell script file "start_check.sh":
#!/bin/bash
# Set environmental variables
. /home/oracle/env/usrdwh1.env
TEMP_FILE=rwcnt
runCheckQuery()
# Run query and dump result into the TEMP_FILE
sqlplus -s "/as sysdba" > /tmp/${TEMP_FILE} << EOF
@/u02/reports/sql/start_check.sql
EOF
if [ $? -eq 0 ]
then err_num=0
else err_num=1
fi
################ MAIN ####################
runCheckQuery
row_count=`cat /tmp/${TEMP_FILE}`
if [ $err_num -eq 0 ]
then
# If no rows were found then send an email alert
if [ $row_count -eq 0 ]; then
echo 'No process found - Please investigate' | mailx -s "Daily check ALERT" [email protected]
fi
else
# There was an error when trying to connect to the db. Need to report it
echo 'Database connection error - Please investigate - Error Message: (' $row_count ')' | mailx -s "Daily check ALERT (Database connection error)" [email protected]
fi
# Remove the tmp file
rm /tmp/${TEMP_FILE}
The sql script file "start_check.sql":
SET SERVEROUTPUT ON
SET FEEDBACK OFF
WHENEVER SQLERROR EXIT;
DECLARE
row_count NUMBER;
BEGIN
SELECT COUNT(*)
INTO row_count
FROM dw_ml_ba ml_ba
WHERE sys_id = 'CCX'
AND ml_ex_start_datetime > TRUNC(sysdate);
DBMS_OUTPUT.PUT_LINE(row_count);
END;
EXIT
Edited by: leocoppens on Jan 4, 2013 4:05 PM

Answer 1

There may be a better, but here is a shell script that works:
#!/bin/ksh
# db_check.sh
# Script used to check if one or all of the databases on
# one server are available.
# Parameter Description
sid=$1    # Database SID or Keyword 'all'
function check1db
sid=$1    # Database SID
ORAENV_ASK=NO
. /usr/local/bin/oraenv "$sid"
ORAENV_ASK=YES
if [ $(ps -ef|grep "ora_smon_$sid"|grep -v grep|wc -l) -eq 0 ]
then
  echo "%-Error, Database $sid is NOT available - Not started\n" >>${CHKLOG}
  return 1
fi
dbok=$(\
sqlplus -s / <<!
if [[ $(echo $dbok|cut -d' ' -f1 ) == 'ERROR:' ]]
then
  echo "%-Error, Database $sid is NOT available - Started with errors\n" >>${CHKLOG}
  return 1
else 
  echo "%-Info, Database $sid is available\n" >>${CHKLOG}
fi
return 0
} # end function check1db
# Set some environment variables:
ORACFG=/etc               # Location of oratab
ORALOG=$HOME/logs         # Location for result log
EMAIL='[email protected]'  # E-mail to send alert
sid=${sid:-'all'}
echo "$0 Job started at: `date` "
BDATE=$(date +%y%m%d)
export CHKLOG=$ORALOG/db_check_${sid}_${BDATE}.log
echo "$0 on `date`" >$CHKLOG
if [ "$sid" = "all" ]
then
  i=0
  stat=0
  cat $ORACFG/oratab | while read LINE
  do
    case $LINE in
     \#*)            ;;      #comment-line in oratab
        sid=`echo $LINE | awk -F: '{print $1}'`
        check1db "$sid"
        stat1=$?
        ((stat += $stat1)) # Combine the Status of All Calls
        ((i = $i + 1))     # Count Number of Databases Checked
    esac
  done
  ((j = $i - $stat))  # Count Number of Databases Available
  echo "\n%-Info, `date +%c`,\n\tTotal databases checked = $i,\n\tAvailable = $j, Not available = $stat\n" >>${CHKLOG}
else
  check1db $sid
  stat=$?
fi
# Beep operator if database down.
if [ ${stat} -ne 0 ]
then
  SUBJ="Database(s) alert."
  mailx -s"$SUBJ" $EMAIL <$CHKLOG
fi
echo "$0 Job stoped at: `date` "
exit $stat:p