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=1878113.88..1878113.94 rows=25 width=34) (actual time=16664.659..16664.659 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2352414 read=375009 dirtied=377 written=7641 -> HashAggregate (cost=1878113.05..1878113.30 rows=25 width=34) (actual time=16664.563..16664.565 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2352411 read=375009 dirtied=377 written=7641 -> Hash Join (cost=94001.06..1877372.25 rows=74080 width=34) (actual time=2504.840..16575.077 rows=72832 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2352411 read=375009 dirtied=377 written=7641 -> Nested Loop (cost=89322.06..1858062.41 rows=1852006 width=46) (actual time=2394.872..15125.077 rows=1826630 loops=1) Buffers: shared hit=2350229 read=375009 dirtied=377 written=7641 -> Hash Join (cost=89321.49..393171.18 rows=463120 width=38) (actual time=2394.823..6668.975 rows=456782 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=319501 read=89110 dirtied=129 written=1467 -> Bitmap Heap Scan on orders (cost=50279.32..340814.31 rows=2315599 width=8) (actual time=958.117..3631.098 rows=2284140 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=255784 Buffers: shared hit=201438 read=60935 dirtied=129 written=1396 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49700.43 rows=2315599 width=0) (actual time=860.017..860.017 rows=2304558 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=6589 written=17 -> Hash (cost=35292.17..35292.17 rows=300000 width=38) (actual time=1431.210..1431.210 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25209kB Buffers: shared hit=118063 read=28175 written=71 -> Nested Loop (cost=905.25..35292.17 rows=300000 width=38) (actual time=31.381..1264.302 rows=300270 loops=1) Buffers: shared hit=118063 read=28175 written=71 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.071..0.172 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=0.017..0.053 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=0.017..0.018 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=22.867..234.744 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=118060 read=28175 written=71 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=15.239..15.239 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=830 written=6 -> Index Scan using lineitem_l_orderkey_idx on lineitem (cost=0.56..3.01 rows=15 width=16) (actual time=0.015..0.017 rows=4 loops=456782) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=2030728 read=285899 dirtied=248 written=6174 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=108.645..108.645 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=0.018..65.333 rows=100000 loops=1) Buffers: shared hit=2179 Planning time: 11.305 ms Execution time: 16669.517 ms (56 rows) COMMIT; COMMIT