BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'IRAN' 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 = 'ECONOMY BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2136489.82..2136491.65 rows=730 width=38) (actual time=27495.381..27495.381 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=784823 read=214446 dirtied=1124 written=57 -> HashAggregate (cost=2136442.33..2136455.11 rows=730 width=38) (actual time=27495.327..27495.329 rows=2 loops=1) Buffers: shared hit=784820 read=214446 dirtied=1124 written=57 -> Nested Loop (cost=497719.29..2135967.49 rows=23742 width=38) (actual time=20569.713..27437.519 rows=24054 loops=1) Buffers: shared hit=784820 read=214446 dirtied=1124 written=57 -> Nested Loop (cost=497719.29..2129196.27 rows=23742 width=16) (actual time=20569.622..27303.659 rows=24054 loops=1) Buffers: shared hit=736712 read=214446 dirtied=1124 written=57 -> Hash Join (cost=497719.29..2122274.97 rows=23768 width=16) (actual time=20569.591..27027.546 rows=24054 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=664405 read=214446 dirtied=1124 written=57 -> Nested Loop (cost=0.00..1622357.84 rows=392031 width=16) (actual time=0.350..5170.275 rows=397031 loops=1) Buffers: shared hit=266287 read=198984 dirtied=1124 written=3 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..45319.87 rows=12993 width=4) (actual time=0.269..214.319 rows=13219 loops=1) Index Cond: (p_type = 'ECONOMY BURNISHED NICKEL'::text) Heap Fetches: 13219 Buffers: shared hit=33 read=11367 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..121.07 rows=31 width=20) (actual time=0.036..0.362 rows=30 loops=13219) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=266254 read=187617 dirtied=1124 written=3 -> Hash (cost=486283.49..486283.49 rows=914864 width=8) (actual time=20568.423..20568.423 rows=911416 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35603kB Buffers: shared hit=398115 read=15462 written=54 -> Hash Join (cost=136579.33..486283.49 rows=914864 width=8) (actual time=4591.738..19631.573 rows=911416 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=398115 read=15462 written=54 -> Bitmap Heap Scan on orders (cost=97548.71..420950.53 rows=4574321 width=12) (actual time=3469.315..7249.267 rows=4561664 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=255062 read=12359 written=47 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..96405.13 rows=4574321 width=0) (actual time=3316.542..3316.542 rows=4584480 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=670 read=11964 written=47 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1121.840..1121.840 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=143053 read=3103 written=7 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=22.635..980.266 rows=299838 loops=1) Buffers: shared hit=143053 read=3103 written=7 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.027..0.069 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=0.005..0.014 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.014..0.014 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=0.011..0.011 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=27.555..178.631 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=143051 read=3103 written=7 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=18.518..18.518 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=832 written=7 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.009..0.010 rows=1 loops=24054) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72307 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.003..0.003 rows=1 loops=24054) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48108 Total runtime: 27508.432 ms (64 rows) COMMIT; COMMIT