BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAQ' 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 = 'STANDARD BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2164234.72..2164236.55 rows=732 width=38) (actual time=64785.506..64785.506 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=729502 read=275758 dirtied=569 written=1493 -> HashAggregate (cost=2164187.08..2164199.89 rows=732 width=38) (actual time=64785.423..64785.424 rows=2 loops=1) Buffers: shared hit=729499 read=275758 dirtied=569 written=1493 -> Nested Loop (cost=497163.28..2163701.16 rows=24296 width=38) (actual time=35530.542..64655.196 rows=24245 loops=1) Buffers: shared hit=729499 read=275758 dirtied=569 written=1493 -> Nested Loop (cost=497163.28..2156771.94 rows=24296 width=16) (actual time=35530.451..62988.088 rows=24245 loops=1) Buffers: shared hit=681009 read=275758 dirtied=569 written=1493 -> Hash Join (cost=497163.28..2149695.71 rows=24300 width=16) (actual time=35530.318..61279.975 rows=24245 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=608142 read=275758 dirtied=569 written=1493 -> Nested Loop (cost=0.00..1650290.26 rows=399833 width=16) (actual time=0.511..24420.930 rows=401183 loops=1) Buffers: shared hit=227261 read=243312 dirtied=534 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46103.76 rows=13253 width=4) (actual time=0.380..729.025 rows=13366 loops=1) Index Cond: (p_type = 'STANDARD BURNISHED NICKEL'::text) Heap Fetches: 13366 Buffers: shared hit=3339 read=8116 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.73 rows=31 width=20) (actual time=0.195..1.752 rows=30 loops=13366) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=223922 read=235196 dirtied=534 -> Hash (cost=485710.98..485710.98 rows=916184 width=8) (actual time=35527.355..35527.355 rows=910555 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35569kB Buffers: shared hit=380878 read=32446 dirtied=35 written=1493 -> Hash Join (cost=136122.93..485710.98 rows=916184 width=8) (actual time=9910.010..34869.588 rows=910555 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=380878 read=32446 dirtied=35 written=1493 -> Bitmap Heap Scan on orders (cost=97092.31..420340.08 rows=4580918 width=12) (actual time=4270.961..15734.831 rows=4557142 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=260604 read=6564 dirtied=35 written=237 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95947.08 rows=4580918 width=0) (actual time=4129.734..4129.734 rows=4584480 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=7892 read=4742 written=218 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=5638.655..5638.655 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=120274 read=25882 written=1256 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=59.110..5415.979 rows=299838 loops=1) Buffers: shared hit=120274 read=25882 written=1256 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.047..0.117 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=0.011..0.027 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.020..0.020 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=0.016..0.017 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=52.372..1059.378 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=120272 read=25882 written=1256 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=40.892..40.892 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=7 read=830 written=36 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.066..0.067 rows=1 loops=24245) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72867 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.062..0.063 rows=1 loops=24245) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48490 Total runtime: 64795.474 ms (64 rows) COMMIT; COMMIT