Postgres testing with an active connection

psql_active.sh

#! /bin/zsh
zmodload zsh/datetime

start=$EPOCHREALTIME

PGPASSWORD=password psql -U localadmin testing \
-c "DO
    \$do\$
    BEGIN
    FOR i IN 1..100 LOOP
        perform count(*) from pg_stat_activity;
    END LOOP;
    END
    \$do\$;" > /dev/null;

end=$EPOCHREALTIME
echo "Elapsed Time: $((end-start))";