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 BRUSHED STEEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2171164.85..2171166.68 rows=732 width=38) (actual time=65109.977..65109.978 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=743003 read=260594 dirtied=932 written=157 -> HashAggregate (cost=2171117.21..2171130.02 rows=732 width=38) (actual time=65109.891..65109.893 rows=2 loops=1) Buffers: shared hit=743000 read=260594 dirtied=932 written=157 -> Nested Loop (cost=498216.82..2170629.27 rows=24397 width=38) (actual time=38581.134..64990.408 rows=23865 loops=1) Buffers: shared hit=743000 read=260594 dirtied=932 written=157 -> Nested Loop (cost=498216.82..2163671.25 rows=24397 width=16) (actual time=38581.064..63769.187 rows=23865 loops=1) Buffers: shared hit=695270 read=260594 dirtied=932 written=157 -> Hash Join (cost=498216.82..2156565.61 rows=24401 width=16) (actual time=38581.016..62317.072 rows=23865 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=623552 read=260594 dirtied=932 written=157 -> Nested Loop (cost=0.00..1656097.27 rows=401503 width=16) (actual time=0.461..22192.384 rows=401417 loops=1) Buffers: shared hit=231429 read=239137 dirtied=868 written=157 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46264.70 rows=13307 width=4) (actual time=0.347..762.030 rows=13374 loops=1) Index Cond: (p_type = 'LARGE BRUSHED STEEL'::text) Heap Fetches: 13374 Buffers: shared hit=2396 read=9166 written=11 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.67 rows=31 width=20) (actual time=0.169..1.583 rows=30 loops=13374) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=229033 read=229971 dirtied=868 written=146 -> Hash (cost=486753.14..486753.14 rows=917094 width=8) (actual time=38579.051..38579.051 rows=911416 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35603kB Buffers: shared hit=392120 read=21457 dirtied=64 -> Hash Join (cost=136817.62..486753.14 rows=917094 width=8) (actual time=9405.304..35894.242 rows=911416 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=392120 read=21457 dirtied=64 -> Bitmap Heap Scan on orders (cost=97787.00..421356.06 rows=4585471 width=12) (actual time=4433.585..16507.636 rows=4561664 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=252068 read=15353 dirtied=64 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..96640.63 rows=4585471 width=0) (actual time=4287.868..4287.868 rows=4584480 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=8364 read=4270 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=4971.388..4971.388 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=140052 read=6104 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=53.489..4753.606 rows=299838 loops=1) Buffers: shared hit=140052 read=6104 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.046..0.108 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=0.009..0.024 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: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.018..0.019 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=49.762..929.360 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=140050 read=6104 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=38.942..38.942 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=13 read=824 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.057..0.057 rows=1 loops=23865) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=71718 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.045..0.046 rows=1 loops=23865) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=47730 Total runtime: 65133.254 ms (64 rows) COMMIT; COMMIT