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 '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=1930643.05..1930643.11 rows=25 width=34) (actual time=17190.257..17190.258 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2277991 read=476790 written=482 -> HashAggregate (cost=1930642.22..1930642.47 rows=25 width=34) (actual time=17190.218..17190.220 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2277988 read=476790 written=482 -> Hash Join (cost=88475.63..1929904.00 rows=73822 width=34) (actual time=2302.098..17102.023 rows=73043 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2277988 read=476790 written=482 -> Nested Loop (cost=83796.63..1910622.71 rows=1848543 width=46) (actual time=2238.421..16373.281 rows=1828600 loops=1) Buffers: shared hit=2275806 read=476790 written=482 -> Hash Join (cost=83796.06..443318.80 rows=462243 width=38) (actual time=2238.398..8957.105 rows=457410 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=311228 read=121742 written=110 -> Bitmap Heap Scan on orders (cost=45454.43..391687.69 rows=2311213 width=8) (actual time=27.663..5783.815 rows=2281952 loops=1) Recheck Cond: (o_orderdate >= '1996-01-01'::date) Rows Removed by Index Recheck: 9109444 Filter: (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone) Rows Removed by Filter: 3608604 Heap Blocks: lossy=256560 Buffers: shared hit=135670 read=120901 written=110 -> Bitmap Index Scan on orders_o_orderkey_o_orderdate_brin_idx (cost=0.00..44876.63 rows=5978217 width=0) (actual time=27.501..27.501 rows=2566400 loops=1) Index Cond: (o_orderdate >= '1996-01-01'::date) Buffers: shared hit=3 read=8 -> Hash (cost=34591.63..34591.63 rows=300000 width=38) (actual time=2208.345..2208.345 rows=300963 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25258kB Buffers: shared hit=175558 read=841 -> Nested Loop (cost=765.14..34591.63 rows=300000 width=38) (actual time=4.510..2092.161 rows=300963 loops=1) Buffers: shared hit=175558 read=841 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.034..0.075 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=0.006..0.022 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=0.010..0.010 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=4.187..408.189 rows=60193 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 1439807 Heap Blocks: lossy=176390 Buffers: shared hit=175555 read=841 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=4.151..4.151 rows=353280 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=4 read=2 -> Index Scan using pk_lineitem on lineitem (cost=0.56..3.02 rows=15 width=16) (actual time=0.013..0.015 rows=4 loops=457410) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=1964578 read=355048 written=372 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=63.166..63.166 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=0.006..36.498 rows=100000 loops=1) Buffers: shared hit=2179 Planning time: 5.245 ms Execution time: 17190.907 ms (60 rows) COMMIT; COMMIT