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 = 'MIDDLE EAST' 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=1883914.00..1883914.06 rows=25 width=34) (actual time=17561.166..17561.166 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2403599 read=323233 dirtied=43 written=601 -> HashAggregate (cost=1883913.17..1883913.42 rows=25 width=34) (actual time=17561.086..17561.088 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2403596 read=323233 dirtied=43 written=601 -> Hash Join (cost=94155.49..1883170.16 rows=74301 width=34) (actual time=3040.492..17469.011 rows=72825 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2403596 read=323233 dirtied=43 written=601 -> Nested Loop (cost=89476.49..1863816.58 rows=1857542 width=46) (actual time=2931.355..16226.453 rows=1826652 loops=1) Buffers: shared hit=2401414 read=323233 dirtied=43 written=601 -> Hash Join (cost=89475.92..394227.17 rows=464494 width=38) (actual time=2931.273..7916.357 rows=456564 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=279022 read=130282 written=368 -> Bitmap Heap Scan on orders (cost=50433.75..341830.80 rows=2322470 width=8) (actual time=1259.226..4551.943 rows=2284238 loops=1) Recheck Cond: ((o_orderdate >= '1996-01-01'::date) AND (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone)) Heap Blocks: exact=256543 Buffers: shared hit=169436 read=93712 written=118 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49853.13 rows=2322470 width=0) (actual time=1126.824..1126.824 rows=2311554 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=6605 written=8 -> Hash (cost=35292.17..35292.17 rows=300000 width=38) (actual time=1654.291..1654.291 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25179kB Buffers: shared hit=109586 read=36570 written=250 -> Nested Loop (cost=905.25..35292.17 rows=300000 width=38) (actual time=29.847..1481.994 rows=299838 loops=1) Buffers: shared hit=109586 read=36570 written=250 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.065..0.146 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=0.14..12.51 rows=25 width=34) (actual time=0.012..0.043 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=0.020..0.020 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=27.471..272.732 rows=59968 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=109583 read=36570 written=250 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=18.343..18.343 rows=59968 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=831 written=1 -> Index Scan using lineitem_l_orderkey_idx on lineitem (cost=0.56..3.01 rows=15 width=16) (actual time=0.014..0.017 rows=4 loops=456564) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=2122392 read=192951 dirtied=43 written=233 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=107.311..107.311 rows=100000 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 4931kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.017..64.176 rows=100000 loops=1) Buffers: shared hit=2179 Planning time: 10.963 ms Execution time: 17563.490 ms (56 rows) COMMIT; COMMIT