if [ $pid ] && /usr/bin/pg_ctl status -D $PGDATA > /dev/null  2 >& 1 
        then
                echo $"Postmaster already running."
        else
                #all systems go -- remove any stale lock files
                rm -f /tmp/.s.PGSQL.${PGPORT} > /dev/null
                echo -n "$PSQL_START"
                su -l postgres -c "/usr/bin/pg_ctl  -D $PGDATA -p /usr/bin/postmaster -o '-p ${PGPORT}' start  > /dev/null 2>&
                sleep 1
                pid=`pidof -s /usr/bin/postmaster`
                if [ $pid ]
                then
                        success "$PSQL_START"
                        touch /var/lock/subsys/${NAME}
                        echo $pid > /var/run/postmaster.${PGPORT}.pid
                        echo
                        su -l postgres -s /bin/sh -c "/usr/bin/pg_autovacuum -D -s  3000  -S  2 " < /dev/null
                else
                        failure "$PSQL_START"
                        echo
                fi
        fi

-v vacuum base threshold
-V vacuum scaling factor
-a analyze base threshold
-A analyze scaling factor: see Vacuum and Analyze.
...
Numerous arguments have default values defined in pg_autovacuum.h.  Atthe time of writing they are:-d  1 -v  1000 -V  2 -a  500  (half of -v if not specified)-A  1    (half of -v if not specified)-s  300  ( 5  minutes)-S  2 
...
- If the number of (inserts + updates + deletes) > AnalyzeThreshold, then  only an analyze is performed.
- If the number of (deletes + updates) > VacuumThreshold, then a  vacuum analyze is performed.
VacuumThreshold is equal to:    vacuum_base_value + (vacuum_scaling_factor * "number of tuples in the table"
AnalyzeThreshold is equal to:    analyze_base_value + (analyze_scaling_factor * "number of tuples in the tablе"
...