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 = 'ECONOMY PLATED COPPER' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2166723.68..2166725.50 rows=729 width=38) (actual time=26620.451..26620.451 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=756254 read=248581 dirtied=3005 written=7391 -> HashAggregate (cost=2166676.26..2166689.02 rows=729 width=38) (actual time=26620.375..26620.376 rows=2 loops=1) Buffers: shared hit=756251 read=248581 dirtied=3005 written=7391 -> Nested Loop (cost=501874.48..2166191.22 rows=24252 width=38) (actual time=19835.228..26566.567 rows=24136 loops=1) Buffers: shared hit=756251 read=248581 dirtied=3005 written=7391 -> Nested Loop (cost=501874.48..2159274.55 rows=24252 width=16) (actual time=19835.154..26434.393 rows=24136 loops=1) Buffers: shared hit=707979 read=248581 dirtied=3005 written=7391 -> Hash Join (cost=501874.48..2152203.00 rows=24284 width=16) (actual time=19835.102..26164.708 rows=24136 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=635449 read=248581 dirtied=3005 written=7391 -> Nested Loop (cost=0.00..1648079.40 rows=401257 width=16) (actual time=0.614..5194.981 rows=397897 loops=1) Buffers: shared hit=235777 read=232608 dirtied=2751 written=1036 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46003.67 rows=13220 width=4) (actual time=0.513..197.975 rows=13246 loops=1) Index Cond: (p_type = 'ECONOMY PLATED COPPER'::text) Heap Fetches: 13246 Buffers: shared read=11465 written=55 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.88 rows=31 width=20) (actual time=0.035..0.364 rows=30 loops=13246) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=235777 read=221143 dirtied=2751 written=981 -> Hash (cost=490390.98..490390.98 rows=918680 width=8) (actual time=19833.075..19833.075 rows=911362 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35601kB Buffers: shared hit=399669 read=15973 dirtied=254 written=6355 -> Hash Join (cost=138770.95..490390.98 rows=918680 width=8) (actual time=5166.000..19326.925 rows=911362 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=399669 read=15973 dirtied=254 written=6355 -> Bitmap Heap Scan on orders (cost=99740.33..424948.31 rows=4593399 width=12) (actual time=4021.847..7842.700 rows=4561761 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=254473 read=15013 dirtied=254 written=6046 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..98591.98 rows=4593399 width=0) (actual time=3780.266..3780.266 rows=4612043 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=771 read=12408 written=5774 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=1143.743..1143.743 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=145196 read=960 written=309 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=31.409..995.811 rows=299838 loops=1) Buffers: shared hit=145196 read=960 written=309 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.035..0.080 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..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.015..0.015 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=0.013..0.014 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=28.614..181.920 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=145194 read=960 written=309 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=19.885..19.885 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=6 read=831 written=287 -> 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=24136) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=72530 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.002..0.003 rows=1 loops=24136) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48272 Total runtime: 26631.674 ms (64 rows) COMMIT; COMMIT