BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' 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 = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'LARGE PLATED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1720200.56..1720202.39 rows=732 width=38) (actual time=11940.295..11940.296 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=1812769 read=222743 dirtied=1429 written=282 -> HashAggregate (cost=1720152.92..1720165.73 rows=732 width=38) (actual time=11940.235..11940.235 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1812766 read=222743 dirtied=1429 written=282 -> Hash Join (cost=39444.32..1719665.86 rows=24353 width=38) (actual time=865.637..11886.673 rows=24785 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1812766 read=222743 dirtied=1429 written=282 -> Nested Loop (cost=39442.76..1719207.68 rows=24353 width=16) (actual time=865.581..11835.507 rows=24785 loops=1) Buffers: shared hit=1812762 read=222743 dirtied=1429 written=282 -> Hash Join (cost=39442.47..1711349.90 rows=24353 width=16) (actual time=865.554..11586.273 rows=24785 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1738258 read=222743 dirtied=1429 written=282 -> Nested Loop (cost=411.78..1671619.06 rows=121764 width=20) (actual time=7.233..10620.795 rows=123437 loops=1) Buffers: shared hit=1592103 read=222743 dirtied=1429 written=282 -> Nested Loop (cost=411.35..1475525.36 rows=400468 width=16) (actual time=7.086..5274.355 rows=405063 loops=1) Buffers: shared hit=269412 read=205428 dirtied=1398 written=258 -> Bitmap Heap Scan on part (cost=410.78..27966.58 rows=13207 width=4) (actual time=7.010..203.994 rows=13470 loops=1) Recheck Cond: ((p_type)::text = 'LARGE PLATED STEEL'::text) Heap Blocks: exact=11499 Buffers: shared hit=2126 read=9443 written=5 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..407.48 rows=13207 width=0) (actual time=4.717..4.717 rows=13470 loops=1) Index Cond: ((p_type)::text = 'LARGE PLATED STEEL'::text) Buffers: shared read=70 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.56..109.30 rows=31 width=20) (actual time=0.034..0.362 rows=30 loops=13470) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=267286 read=195985 dirtied=1398 written=253 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=405063) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1322691 read=17315 dirtied=31 written=24 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=855.041..855.041 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=146155 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=19.651..752.123 rows=299838 loops=1) Buffers: shared hit=146155 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.049..0.082 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..0.013 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 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=0.015..0.015 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::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=17.579..139.548 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=146153 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=10.858..10.858 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=836 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.008..0.009 rows=1 loops=24785) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=74504 -> 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..0.005 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.472 ms Execution time: 11941.131 ms (66 rows) COMMIT; COMMIT