Oracle Database Alert log script error - linux

Question

i wrote alert log script and some how this is not working and not throwing any error when i execute the script
i am suspecting sed part is not working properly. could you please advice where i am doing wrong?
here is the piece of code
#!/bin/sh
## Heading #########################################################################################
#---------------------------------------------------------------------------------------#
# script usage #
#---------------------------------------------------------------------------------------#
_usage() {
echo "Usage: $0 ORACLE_SID "
} # _usage
ORACLE_SID="$1"
setenv ()
{
eval "$1=$2"
export "$1"
} # setenv
unsetenv ()
{
while [ $# -gt 0 ]
do
unset "$1"
shift
done
} # unsetenv
if [ $# -ne 1 ]; then
_usage
exit 1
fi
Env=/u01/app/oracle/config
HN=`uname -n`
ERROR_FILE=/tmp/${ORACLE_SID}_error.log
HN=`hostname`
DBA_MAIL="oracle.mail#company"
DBA_PAGE=""
#+--------------------------------------------------------------------------------------+
#| get oracle environment variables from our common env dir |
#+--------------------------------------------------------------------------------------+
if [ -r $Env/${ORACLE_SID}.env ]
then
. $Env/${ORACLE_SID}.env
else
ORACLE_SID=""
fi
#+--------------------------------------------------------------------------------------+
#| just checking for Oracle Env variables for connecting database |
#+--------------------------------------------------------------------------------------+
if [ "$ORACLE_SID" = "" ]
then
echo "ORACLE_SID is invalid"
exit 1
fi
if [ "$ORACLE_HOME" = "" ]
then
echo "The environment variable ORACLE_HOME must be set"
exit 1
fi
if [ "$ORACLE_BASE" = "" ]
then
echo "The environment variable ORACLE_BASE must be set"
exit 1
fi
_AlertLogLoc ()
{
ALERTLOG=`$ORACLE_HOME/bin/sqlplus -s "/as sysdba" << EOF
set head off pause off term on feed off timing off
select value from v\\$parameter where name like 'background_dump_dest';
exit;
EOF`
}
_AlertLogLoc
echo $ALERTLOG
export ALERTLOG
if [ -f $ALERTLOG/alert_${ORACLE_SID}.log ]; then
echo "Found Database Alert log"
else
echo "Alert log not found .. exit from script"
fi
if [ -f $ALERTLOG/alert_${ORACLE_SID}.skip ]; then
echo " ORACLE_SID skip error file found"
SKIP_ERR=`cat $ALERTLOG/alert_$ORACLE_SID.skip|xargs|sed -e 's/ /|/g'`
echo $SKIP_ERR
else
echo "No errors will be excluded"
fi
REC_CUR_ALSIZE=/oraworkspace/OSE/logs/alert_${ORACLE_SID}.size # file to record current alert log lines
#---------------------------------------------------------------------------------------------------------#
# let Capture ORA- error from the alert log #
#---------------------------------------------------------------------------------------------------------#
if [ -f $REC_CUR_ALSIZE ]; then
ALSIZE=`cat $REC_CUR_ALSIZE|sed -e 's/^[ \t]*//'`
ALSIZE=`expr $ALSIZE + 1`
else
ALSIZE=0
fi
if [ $ALSIZE -eq 0 ]; then
echo "PROBABLY RUNNUNG THE SCRIPT FIRST TIME"
sed -n $ALSIZE',$p' $ALERTLOG/alert_${ORACLE_SID}.log |egrep -v "$SKIP_ERR"|grep -i 'ORA-' > /tmp/${ORACLE_SID}_error.log
#`wc -l $ALERTLOG/alert_${ORACLE_SID}.log > $REC_CUR_ALSIZE
cat $ALERTLOG/alert_${ORACLE_SID}.log|wc -l > /oraworkspace/OSE/logs/alert_${ORACLE_SID}.size
#ALSIZE=`cat $ALERTLOG/alert_${ORACLE_SID}.log |wc -l`
else
sed -n ${ALSIZE}',$p' $ALERTLOG/alert_${ORACLE_SID}.log |egrep -v "$SKIP_ERR"|grep -i 'ORA-' > /tmp/${ORACLE_SID}_error.log
#wc -l $ALERTLOG/alert_${ORACLE_SID}.log >> $REC_CUR_ALSIZE
cat $ALERTLOG/alert_${ORACLE_SID}.log |wc -l > /oraworkspace/OSE/logs/alert_${ORACLE_SID}.size
fi
#---------------------------------------------------------------------------------------------------------#
# Notify if any errors are found #
#---------------------------------------------------------------------------------------------------------#
ERR_CNT=`cat /tmp/${ORACLE_SID}_error.log |wc -l`
if [ $ERR_CNT -ne 0 ]; then
echo "Errors found in the alert log. send email notification"
mailx -s "${HN}:${ORACLE_SID} ORA error Found in the alert log" ${DBA_MAIL} < $ERROR_FILE
#mailx -s "${HN}:${ORACLE_SID} ORA error Found in the alert log" ${DBA_MAIL} < $ERROR_FILE
else
echo " No errors found in the alert log"
fi

Answer 1

If $ALERTLOG/alert_$ORACLE_SID.skip doesn't exist or is empty (around line 94), the egrep -v "$SKIP_ERR" will exclude all lines from the sed output, so it will not have a chance to see any remaining ORA- errors.
ALSIZE=1
SKIP_ERR=""
sed -n $ALSIZE',$p' $ALERTLOG/alert_${ORACLE_SID}.log |\
egrep -v "$SKIP_ERR"|wc -l
0
SKIP_ERR="dummy"
sed -n $ALSIZE',$p' $ALERTLOG/alert_${ORACLE_SID}.log |\
egrep -v "$SKIP_ERR"|wc -l
15165
So you need to set your SKIP_ERR to something when it's not set or empty (if your skip file is empty). You haven't said if that is the case or shown the script output, but it seems to work apart from that.
Also not that if ALSIZE is zero sed isn't happy, at least in RHEL 5:
ALSIZE=0
SKIP_ERR="dummy"
sed -n $ALSIZE',$p' $ALERTLOG/alert_${ORACLE_SID}.log |\
egrep -v "$SKIP_ERR"|wc -l
sed: -e expression #1, char 4: invalid usage of line address 0
0
And when you test that the file exists at line 91, you show a message stating that and suggesting you'll stop there, but there is no exit after line 94; doesn't seem to be relevant here but seems like an oversight?