BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'SAUDI ARABIA' 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 POLISHED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2196447.35..2196449.18 rows=731 width=38) (actual time=27967.048..27967.048 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=746284 read=254809 dirtied=3298 written=396 -> HashAggregate (cost=2196399.79..2196412.58 rows=731 width=38) (actual time=27966.992..27966.994 rows=2 loops=1) Buffers: shared hit=746281 read=254809 dirtied=3298 written=396 -> Nested Loop (cost=503095.35..2195902.25 rows=24877 width=38) (actual time=19124.570..27894.192 rows=24144 loops=1) Buffers: shared hit=746281 read=254809 dirtied=3298 written=396 -> Nested Loop (cost=503095.35..2188807.33 rows=24877 width=16) (actual time=19124.518..27691.532 rows=24144 loops=1) Buffers: shared hit=697993 read=254809 dirtied=3298 written=396 -> Hash Join (cost=503095.35..2181563.11 rows=24877 width=16) (actual time=19124.493..27311.121 rows=24144 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=625443 read=254809 dirtied=3298 written=396 -> Nested Loop (cost=0.00..1676171.19 rows=409559 width=16) (actual time=0.376..7027.557 rows=394032 loops=1) Buffers: shared hit=223556 read=240786 dirtied=3298 written=396 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46779.89 rows=13480 width=4) (actual time=0.269..159.384 rows=13153 loops=1) Index Cond: (p_type = 'SMALL POLISHED COPPER'::text) Heap Fetches: 13153 Buffers: shared hit=7440 read=3895 written=14 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.56 rows=31 width=20) (actual time=0.049..0.505 rows=30 loops=13153) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=216116 read=236891 dirtied=3298 written=382 -> Hash (cost=491558.43..491558.43 rows=922954 width=8) (actual time=19122.521..19122.521 rows=911364 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35601kB Buffers: shared hit=401884 read=14023 -> Hash Join (cost=139241.99..491558.43 rows=922954 width=8) (actual time=3738.913..18665.047 rows=911364 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=401884 read=14023 -> Bitmap Heap Scan on orders (cost=100211.36..425992.88 rows=4614768 width=12) (actual time=2876.884..6757.708 rows=4561702 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=256560 read=13191 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..99057.67 rows=4614768 width=0) (actual time=2738.204..2738.204 rows=4616605 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=13191 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=861.134..861.134 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=145324 read=832 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=36.414..757.698 rows=299838 loops=1) Buffers: shared hit=145324 read=832 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.023..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=0.003..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.011..0.011 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=0.009..0.010 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=22.293..139.630 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145322 read=832 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=15.583..15.583 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=832 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.013..0.013 rows=1 loops=24144) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72550 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.005..0.005 rows=1 loops=24144) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48288 Total runtime: 27980.279 ms (64 rows) COMMIT; COMMIT