BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'EGYPT' 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 = 'SMALL ANODIZED TIN' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2184926.76..2184928.58 rows=731 width=38) (actual time=29692.547..29692.548 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=781155 read=229138 dirtied=2871 written=199 -> HashAggregate (cost=2184879.19..2184891.98 rows=731 width=38) (actual time=29692.469..29692.471 rows=2 loops=1) Buffers: shared hit=781152 read=229138 dirtied=2871 written=199 -> Nested Loop (cost=501710.99..2184386.33 rows=24643 width=38) (actual time=21199.630..29621.118 rows=24492 loops=1) Buffers: shared hit=781152 read=229138 dirtied=2871 written=199 -> Nested Loop (cost=501710.99..2177358.15 rows=24643 width=16) (actual time=21199.559..29414.490 rows=24492 loops=1) Buffers: shared hit=732168 read=229138 dirtied=2871 written=199 -> Hash Join (cost=501710.99..2170182.05 rows=24643 width=16) (actual time=21199.509..29024.954 rows=24492 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=658566 read=229138 dirtied=2871 written=199 -> Nested Loop (cost=0.00..1666196.12 rows=405703 width=16) (actual time=0.427..6534.350 rows=401905 loops=1) Buffers: shared hit=258176 read=214420 dirtied=2871 written=199 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46522.37 rows=13393 width=4) (actual time=0.330..132.744 rows=13380 loops=1) Index Cond: (p_type = 'SMALL ANODIZED TIN'::text) Heap Fetches: 13380 Buffers: shared hit=9393 read=2100 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.62 rows=31 width=20) (actual time=0.046..0.463 rows=30 loops=13380) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=248783 read=212320 dirtied=2871 written=199 -> Hash (cost=490208.20..490208.20 rows=920223 width=8) (actual time=21198.046..21198.046 rows=911405 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35602kB Buffers: shared hit=400387 read=14718 -> Hash Join (cost=138934.05..490208.20 rows=920223 width=8) (actual time=4685.186..20661.072 rows=911405 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=400387 read=14718 -> Bitmap Heap Scan on orders (cost=99903.43..424721.17 rows=4601116 width=12) (actual time=3420.858..7713.071 rows=4561673 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=255704 read=13245 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98753.15 rows=4601116 width=0) (actual time=3263.606..3263.606 rows=4602796 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13148 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1263.593..1263.593 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=144683 read=1473 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=32.636..1110.227 rows=299838 loops=1) Buffers: shared hit=144683 read=1473 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.037..0.096 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..0.018 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.018..0.018 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.015..0.016 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=905.09..6455.63 rows=60000 width=8) (actual time=29.675..205.442 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=144681 read=1473 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=19.937..19.937 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=174 read=663 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.013..0.014 rows=1 loops=24492) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73602 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.005..0.006 rows=1 loops=24492) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48984 Total runtime: 29713.183 ms (64 rows) COMMIT; COMMIT