rlddt

-- show running queries (pre 9.2)
SELECT procpid, age(clock_timestamp(), query_start), usename, current_query 
FROM pg_stat_activity 
WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%' 
ORDER BY query_start desc;

-- show running queries (9.2)
SELECT pid, age(clock_timestamp(), query_start), usename, query 
FROM pg_stat_activity 
WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%' 

rlddt

CREATE AGGREGATE vector_sum (
    sfunc = AXH_Vector_Sum,
    basetype = int[],
    stype = int[],
    initcond = '{0}'
);

DROP FUNCTION IF EXISTS AXH_Vector_Sum(int[], int[]);
CREATE OR REPLACE FUNCTION AXH_Vector_Sum(int[], int[]) 
    RETURNS int[] AS $$