BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'INDONESIA' 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 = 'ASIA' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'MEDIUM ANODIZED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1733473.92..1733475.74 rows=730 width=38) (actual time=11782.363..11782.364 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=1914565 read=350040 dirtied=37 written=18306 -> HashAggregate (cost=1733426.42..1733439.20 rows=730 width=38) (actual time=11782.310..11782.311 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1914562 read=350040 dirtied=37 written=18306 -> Hash Join (cost=39453.76..1732935.46 rows=24548 width=38) (actual time=1012.683..11740.787 rows=24093 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1914562 read=350040 dirtied=37 written=18306 -> Nested Loop (cost=39452.20..1732473.62 rows=24548 width=16) (actual time=1012.614..11703.548 rows=24093 loops=1) Buffers: shared hit=1914558 read=350040 dirtied=37 written=18306 -> Hash Join (cost=39451.91..1724544.85 rows=24573 width=16) (actual time=1012.589..11508.142 rows=24093 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1842138 read=350040 dirtied=37 written=18306 -> Nested Loop (cost=421.22..1684807.69 rows=122865 width=20) (actual time=7.097..10401.026 rows=119910 loops=1) Buffers: shared hit=1732006 read=313935 dirtied=37 written=18275 -> Nested Loop (cost=420.79..1486249.98 rows=405500 width=16) (actual time=7.033..4589.496 rows=394817 loops=1) Buffers: shared hit=231472 read=233077 dirtied=37 written=13306 -> Bitmap Heap Scan on part (cost=416.07..28170.52 rows=13373 width=4) (actual time=6.945..144.058 rows=13196 loops=1) Recheck Cond: ((p_type)::text = 'MEDIUM ANODIZED COPPER'::text) Heap Blocks: exact=11355 Buffers: shared hit=3381 read=8057 written=288 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..412.73 rows=13373 width=0) (actual time=4.651..4.651 rows=13196 loops=1) Index Cond: ((p_type)::text = 'MEDIUM ANODIZED COPPER'::text) Buffers: shared read=83 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.040..0.325 rows=30 loops=13196) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=398316 Buffers: shared hit=228091 read=225020 dirtied=37 written=13018 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.025..0.025 rows=30 loops=13196) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41077 read=13718 written=764 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.014..0.014 rows=0 loops=394817) 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=1500534 read=80858 written=4969 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1002.039..1002.039 rows=300270 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14653kB Buffers: shared hit=110132 read=36105 written=31 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=19.880..908.336 rows=300270 loops=1) Buffers: shared hit=110132 read=36105 written=31 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.037..0.071 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=0.006..0.016 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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=0.008..0.009 rows=1 loops=1) Filter: (r_name = 'ASIA'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.11..6455.64 rows=60000 width=8) (actual time=17.761..170.403 rows=60054 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145400 Buffers: shared hit=110130 read=36105 written=31 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=11.601..11.601 rows=60054 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=830 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24093) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72420 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.022..0.022 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=0.004..0.006 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.235 ms Execution time: 11783.709 ms (72 rows) COMMIT; COMMIT