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 '1995-01-01' and o_orderdate < date '1995-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2450856.00..2450856.06 rows=25 width=34) (actual time=72562.309..72562.310 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=954123 read=536692 dirtied=17 written=30 -> HashAggregate (cost=2450855.17..2450855.42 rows=25 width=34) (actual time=72562.208..72562.208 rows=5 loops=1) Buffers: shared hit=954120 read=536692 dirtied=17 written=30 -> Hash Join (cost=403544.94..2450121.25 rows=73392 width=34) (actual time=11648.861..72415.053 rows=73180 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=954120 read=536692 dirtied=17 written=30 -> Hash Join (cost=398865.94..2407972.65 rows=1836784 width=46) (actual time=11526.952..68529.360 rows=1825468 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=954114 read=534516 dirtied=17 written=30 -> Seq Scan on lineitem (cost=0.00..1686913.24 rows=60765124 width=16) (actual time=0.029..15919.395 rows=59985538 loops=1) Buffers: shared hit=613094 read=466168 -> Hash (cost=393124.61..393124.61 rows=459306 width=38) (actual time=11526.205..11526.205 rows=456044 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32066kB Buffers: shared hit=341020 read=68348 dirtied=17 written=30 -> Hash Join (cost=88911.63..393124.61 rows=459306 width=38) (actual time=2484.109..11126.596 rows=456044 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=341020 read=68348 dirtied=17 written=30 -> Bitmap Heap Scan on orders (cost=49869.41..340877.35 rows=2296529 width=8) (actual time=1272.012..4021.127 rows=2275103 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=205917 read=57212 dirtied=17 written=30 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49295.28 rows=2296529 width=0) (actual time=1150.993..1150.993 rows=2305051 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=3 read=6586 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=1211.854..1211.854 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=135103 read=11136 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=29.877..1062.920 rows=300270 loops=1) Buffers: shared hit=135103 read=11136 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.057..0.149 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=0.011..0.053 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.001..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=0.021..0.022 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=25.300..193.967 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=135100 read=11136 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=17.046..17.046 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=831 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=121.646..121.646 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=3 read=2176 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.013..77.965 rows=100000 loops=1) Buffers: shared hit=3 read=2176 Total runtime: 72577.791 ms (55 rows) COMMIT; COMMIT