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 = 'EUROPE' 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=1954817.24..1954817.30 rows=25 width=34) (actual time=18749.974..18749.974 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2280108 read=462905 written=14643 -> HashAggregate (cost=1954816.41..1954816.66 rows=25 width=34) (actual time=18749.927..18749.929 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2280105 read=462905 written=14643 -> Hash Join (cost=104951.02..1954091.71 rows=72470 width=34) (actual time=2608.964..18662.298 rows=72634 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2280105 read=462905 written=14643 -> Nested Loop (cost=100272.02..1935077.73 rows=1814704 width=46) (actual time=2550.740..17906.954 rows=1822382 loops=1) Buffers: shared hit=2278360 read=462468 written=14643 -> Hash Join (cost=100271.46..489484.93 rows=453784 width=38) (actual time=2550.723..8342.333 rows=455662 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=395392 read=34540 written=1166 -> Bitmap Heap Scan on orders (cost=61929.83..438097.02 rows=2268919 width=8) (actual time=27.287..4758.179 rows=2275583 loops=1) Recheck Cond: (o_orderdate >= '1995-01-01'::date) Rows Removed by Index Recheck: 6833941 Filter: (o_orderdate < '1996-01-01 00:00:00'::timestamp without time zone) Rows Removed by Filter: 5890476 Heap Blocks: lossy=253522 Buffers: shared hit=221469 read=32064 written=1166 -> Bitmap Index Scan on orders_o_orderkey_o_orderdate_brin_idx (cost=0.00..61362.60 rows=8176346 width=0) (actual time=27.123..27.123 rows=2535680 loops=1) Index Cond: (o_orderdate >= '1995-01-01'::date) Buffers: shared hit=11 -> Hash (cost=34591.63..34591.63 rows=300000 width=38) (actual time=2521.087..2521.087 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25258kB Buffers: shared hit=173923 read=2476 -> Nested Loop (cost=765.14..34591.63 rows=300000 width=38) (actual time=3.680..2404.192 rows=300963 loops=1) Buffers: shared hit=173923 read=2476 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.034..0.086 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=0.008..0.026 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.001..0.001 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.009 rows=1 loops=1) Filter: (r_name = 'EUROPE'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=765.00..6315.54 rows=60000 width=8) (actual time=3.634..470.304 rows=60193 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 1439807 Heap Blocks: lossy=176390 Buffers: shared hit=173920 read=2476 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.602..3.602 rows=353280 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=6 -> Index Scan using pk_lineitem on lineitem (cost=0.56..3.04 rows=15 width=16) (actual time=0.018..0.019 rows=4 loops=455662) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=1882968 read=427928 written=13477 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=57.565..57.565 rows=100000 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 4931kB Buffers: shared hit=1742 read=437 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.007..32.441 rows=100000 loops=1) Buffers: shared hit=1742 read=437 Planning time: 4.704 ms Execution time: 18750.658 ms (60 rows) COMMIT; COMMIT