Pg_autovacuum script.

Since I could not locate anything similar on the net, I have written a
script to automatically start and stop the autovacuum daemon. This should be
added to the existing postgresql script.

Please let me know if you can see any shortcomings. I have taken into
consideration that more than one postmaster may be running on the same
machine, so I have stored the pg_autovacuum pid into a file, which is
referenced when bringing down the postmaster instance. I have not gone to
the effort of including all the pg_autovacuum parameters, you can add them
at will.

One issue I can foresee is maintainability, where you will have to update
the postgresql script file with the snippets below, every postgres upgrade.

Here are the snippets :

This goes where all the other init scripts are located.
# Initialize pg_autovacuum defaults. Theo Galanakis 11/04/2005
PGAUTO_LOGFILE=/var/lib/pg_autovacuum.log
PGAUTO_SLEEP=60

Added to the end of the Start function.
# Start pg_autovacuum. Theo Galanakis 11/05/2005
PAUTO_START=$"Starting pg_autovacuum service: "
echo -n "$PAUTO_START"
pg_autovacuum -D -s ${PGAUTO_SLEEP} -p ${PGPORT} -U postgres -L
${PGAUTO_LOGFILE}
pg_autovacuum_pid=`pidof -s $PGENGINE/pg_autovacuum`
if [ $pg_autovacuum_pid ]
then
success "$PAUTO_START"
echo $pg_autovacuum_pid > /var/run/pg_autovacuum.${PGPORT}.pid
echo
else
failure "$PAUTO_START"
echo
fi

Added to the end of the Stop function.
# Stop pg_autovaccum. Theo Galanakis 11/04/2005
echo -n $"Stopping pg_autovacuum service: "
pg_autovacuum_pid=`head -n 1 /var/run/pg_autovacuum.${PGPORT}.pid`
kill -TERM $pg_autovacuum_pid
ret=`ps --no-heading ${pg_autovacuum_pid}`
if [ -z "$ret" ]
then
echo_success
else
echo_failure
fi
echo
rm -f /var/run/pg_autovacuum.${PGPORT}.pid

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