BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'ALGERIA' then volume else 0 end) / sum(volume) as mkt_share from ( select extract(year from o_orderdate) as o_year, l_extendedprice * (1 - l_discount) as volume, n2.n_name as nation from part, supplier, lineitem, orders, customer, nation n1, nation n2, region where p_partkey = l_partkey and s_suppkey = l_suppkey and l_orderkey = o_orderkey and o_custkey = c_custkey and c_nationkey = n1.n_nationkey and n1.n_regionkey = r_regionkey and r_name = 'AFRICA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'PROMO BRUSHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1739045.79..1739047.61 rows=729 width=38) (actual time=12545.319..12545.319 rows=2 loops=1) Sort Key: (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone)) Sort Method: quicksort Memory: 25kB Buffers: shared hit=2067151 read=235149 -> HashAggregate (cost=1738998.37..1739011.13 rows=729 width=38) (actual time=12545.283..12545.285 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=2067148 read=235149 -> Hash Join (cost=38753.73..1738510.05 rows=24416 width=38) (actual time=2130.376..12502.480 rows=24001 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=2067148 read=235149 -> Nested Loop (cost=38752.17..1738050.69 rows=24416 width=16) (actual time=2130.329..12462.860 rows=24001 loops=1) Buffers: shared hit=2067144 read=235149 -> Hash Join (cost=38751.87..1730159.63 rows=24456 width=16) (actual time=2130.263..12281.982 rows=24001 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1997187 read=232938 -> Nested Loop (cost=421.72..1691126.37 rows=122279 width=20) (actual time=7.162..10081.108 rows=120767 loops=1) Buffers: shared hit=1820791 read=232936 -> Nested Loop (cost=421.29..1493452.78 rows=403717 width=16) (actual time=7.101..5488.998 rows=397201 loops=1) Buffers: shared hit=311770 read=150927 -> Bitmap Heap Scan on part (cost=416.64..28260.13 rows=13447 width=4) (actual time=7.025..277.506 rows=13235 loops=1) Recheck Cond: ((p_type)::text = 'PROMO BRUSHED COPPER'::text) Heap Blocks: exact=11361 Buffers: shared hit=9 read=11434 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.28 rows=13447 width=0) (actual time=4.779..4.779 rows=13235 loops=1) Index Cond: ((p_type)::text = 'PROMO BRUSHED COPPER'::text) Buffers: shared read=82 -> Bitmap Heap Scan on lineitem (cost=4.65..108.65 rows=31 width=20) (actual time=0.039..0.379 rows=30 loops=13235) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=397197 Buffers: shared hit=311761 read=139493 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_idx (cost=0.00..4.64 rows=31 width=0) (actual time=0.024..0.024 rows=30 loops=13235) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=40527 read=13530 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=397201) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1509021 read=82009 -> Hash (cost=34580.15..34580.15 rows=300000 width=4) (actual time=2120.171..2120.171 rows=299493 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14626kB Buffers: shared hit=176396 read=2 -> Nested Loop (cost=766.08..34580.15 rows=300000 width=4) (actual time=3.670..2029.320 rows=299493 loops=1) Buffers: shared hit=176396 read=2 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.022..0.051 rows=5 loops=1) Hash Cond: (n1.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation n1 (cost=0.00..1.25 rows=25 width=8) (actual time=0.003..0.010 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.010..0.010 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.005..0.006 rows=1 loops=1) Filter: (r_name = 'AFRICA'::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=3.653..396.652 rows=59899 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Rows Removed by Index Recheck: 1440101 Heap Blocks: lossy=176390 Buffers: shared hit=176394 read=2 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.609..3.609 rows=353280 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=4 read=2 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.006..0.007 rows=1 loops=24001) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=69957 read=2211 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.016..0.016 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.003..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 9.785 ms Execution time: 12545.868 ms (73 rows) COMMIT; COMMIT