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 BURNISHED NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1734711.18..1734712.99 rows=727 width=38) (actual time=10270.381..10270.381 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=1797711 read=246196 dirtied=9 written=4602 -> HashAggregate (cost=1734663.90..1734676.62 rows=727 width=38) (actual time=10270.321..10270.322 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1797708 read=246196 dirtied=9 written=4602 -> Hash Join (cost=39453.92..1734176.00 rows=24395 width=38) (actual time=1117.810..10230.909 rows=24613 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1797708 read=246196 dirtied=9 written=4602 -> Nested Loop (cost=39452.35..1733717.03 rows=24395 width=16) (actual time=1117.749..10195.685 rows=24613 loops=1) Buffers: shared hit=1797704 read=246196 dirtied=9 written=4602 -> Hash Join (cost=39452.06..1725845.67 rows=24395 width=16) (actual time=1117.706..9993.426 rows=24613 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1723718 read=246196 dirtied=9 written=4602 -> Nested Loop (cost=421.38..1686113.62 rows=121977 width=20) (actual time=7.297..8800.842 rows=123374 loops=1) Buffers: shared hit=1613667 read=210092 dirtied=9 written=4575 -> Nested Loop (cost=420.94..1488441.57 rows=403705 width=16) (actual time=7.095..4435.600 rows=407271 loops=1) Buffers: shared hit=288183 read=188929 dirtied=9 written=4080 -> Bitmap Heap Scan on part (cost=416.22..28194.99 rows=13393 width=4) (actual time=6.981..192.234 rows=13566 loops=1) Recheck Cond: ((p_type)::text = 'LARGE BURNISHED NICKEL'::text) Heap Blocks: exact=11560 Buffers: shared read=11645 written=253 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..412.88 rows=13393 width=0) (actual time=4.698..4.698 rows=13566 loops=1) Index Cond: ((p_type)::text = 'LARGE BURNISHED NICKEL'::text) Buffers: shared read=85 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.039..0.301 rows=30 loops=13566) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=409098 Buffers: shared hit=288183 read=177284 dirtied=9 written=3827 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.025..0.025 rows=30 loops=13566) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41435 read=14934 written=322 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.010..0.010 rows=0 loops=407271) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1325484 read=21163 written=495 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1107.258..1107.258 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=110051 read=36104 written=27 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=24.718..1013.645 rows=299838 loops=1) Buffers: shared hit=110051 read=36104 written=27 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.051..0.087 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=0.007..0.017 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.027..0.027 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.021..0.022 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=905.11..6455.64 rows=60000 width=8) (actual time=18.710..191.663 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=110049 read=36104 written=27 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=12.359..12.359 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.007 rows=1 loops=24613) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73986 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.018..0.018 rows=25 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 10kB Buffers: shared hit=1 -> Seq Scan on nation n2 (cost=0.00..1.25 rows=25 width=30) (actual time=0.002..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 7.860 ms Execution time: 10271.431 ms (70 rows) COMMIT; COMMIT