BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue from customer, orders, lineitem, supplier, nation, region where c_custkey = o_custkey and l_orderkey = o_orderkey and l_suppkey = s_suppkey and c_nationkey = s_nationkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'ASIA' and o_orderdate >= date '1996-01-01' and o_orderdate < date '1996-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2426953.88..2426953.94 rows=25 width=34) (actual time=79037.059..79037.059 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1026866 read=450416 written=13 -> HashAggregate (cost=2426953.04..2426953.29 rows=25 width=34) (actual time=79036.957..79036.961 rows=5 loops=1) Buffers: shared hit=1026863 read=450416 written=13 -> Hash Join (cost=399476.26..2426221.64 rows=73140 width=34) (actual time=14480.146..78854.254 rows=72833 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1026863 read=450416 written=13 -> Hash Join (cost=394797.26..2384192.48 rows=1830938 width=46) (actual time=14347.083..74911.252 rows=1826686 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1024681 read=450416 written=13 -> Seq Scan on lineitem (cost=0.00..1670259.89 rows=60165189 width=16) (actual time=0.048..19628.369 rows=60045379 loops=1) Buffers: shared hit=694334 read=374274 written=4 -> Hash (cost=389074.18..389074.18 rows=457846 width=38) (actual time=14346.421..14346.421 rows=456815 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32120kB Buffers: shared hit=330347 read=76142 written=9 -> Hash Join (cost=87544.70..389074.18 rows=457846 width=38) (actual time=3213.127..13971.242 rows=456815 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=330347 read=76142 written=9 -> Bitmap Heap Scan on orders (cost=48502.48..336868.90 rows=2289228 width=8) (actual time=1779.483..6070.173 rows=2284077 loops=1) Recheck Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=185814 read=74436 written=9 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..47930.18 rows=2289228 width=0) (actual time=1664.595..1664.595 rows=2288556 loops=1) Index Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone)) Buffers: shared read=6239 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1433.131..1433.131 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=144533 read=1706 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=32.884..1222.404 rows=300270 loops=1) Buffers: shared hit=144533 read=1706 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.072..0.168 rows=5 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 20 Buffers: shared hit=3 -> Index Scan using pk_nation on nation (cost=0.00..12.63 rows=25 width=34) (actual time=0.015..0.049 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.026..0.027 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=33.150..220.475 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=144530 read=1706 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=22.720..22.720 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=7 read=829 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=130.965..130.965 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.009..82.830 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 79046.788 ms (55 rows) COMMIT; COMMIT