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=1914862.31..1914862.38 rows=25 width=34) (actual time=17342.303..17342.304 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2342518 read=407370 written=6594 -> HashAggregate (cost=1914861.48..1914861.73 rows=25 width=34) (actual time=17342.261..17342.262 rows=5 loops=1) Group Key: nation.n_name Buffers: shared hit=2342515 read=407370 written=6594 -> Hash Join (cost=88117.00..1914129.09 rows=73239 width=34) (actual time=2561.873..17255.898 rows=72846 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=2342515 read=407370 written=6594 -> Nested Loop (cost=83438.00..1894963.12 rows=1833945 width=46) (actual time=2494.949..16499.878 rows=1826665 loops=1) Buffers: shared hit=2340333 read=407370 written=6594 -> Hash Join (cost=83437.44..440121.10 rows=458592 width=38) (actual time=2494.877..8913.403 rows=456802 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=345211 read=85733 written=4283 -> Bitmap Heap Scan on orders (cost=45095.80..388594.94 rows=2292962 width=8) (actual time=27.640..5486.825 rows=2283946 loops=1) Recheck Cond: (o_orderdate >= '1996-01-01'::date) Rows Removed by Index Recheck: 9118635 Filter: (o_orderdate < '1997-01-01 00:00:00'::timestamp without time zone) Rows Removed by Filter: 3612419 Heap Blocks: lossy=254534 Buffers: shared hit=204090 read=50455 written=362 -> Bitmap Index Scan on orders_o_orderkey_o_orderdate_brin_idx (cost=0.00..44522.56 rows=5931009 width=0) (actual time=27.482..27.482 rows=2545920 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=2464.738..2464.738 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 25209kB Buffers: shared hit=141121 read=35278 written=3921 -> Nested Loop (cost=765.14..34591.63 rows=300000 width=38) (actual time=4.523..2347.853 rows=300270 loops=1) Buffers: shared hit=141121 read=35278 written=3921 -> Nested Loop (cost=0.14..13.95 rows=5 width=30) (actual time=0.039..0.082 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..0.028 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..0.011 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=4.337..458.712 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Rows Removed by Index Recheck: 1439946 Heap Blocks: lossy=176390 Buffers: shared hit=141118 read=35278 written=3921 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=4.302..4.302 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=456802) Index Cond: (l_orderkey = orders.o_orderkey) Buffers: shared hit=1995122 read=321637 written=2311 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=66.342..66.342 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=0.007..39.369 rows=100000 loops=1) Buffers: shared hit=2179 Planning time: 5.826 ms Execution time: 17343.073 ms (60 rows) COMMIT; COMMIT