BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'EGYPT' 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 = 'MEDIUM ANODIZED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1749722.29..1749724.12 rows=732 width=38) (actual time=11106.392..11106.392 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=1765428 read=245049 dirtied=54 written=7280 -> HashAggregate (cost=1749674.65..1749687.46 rows=732 width=38) (actual time=11106.295..11106.297 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1765425 read=245049 dirtied=54 written=7280 -> Hash Join (cost=39454.80..1749178.01 rows=24832 width=38) (actual time=1195.911..11062.360 rows=24387 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1765425 read=245049 dirtied=54 written=7280 -> Nested Loop (cost=39453.24..1748710.85 rows=24832 width=16) (actual time=1195.829..11021.477 rows=24387 loops=1) Buffers: shared hit=1765421 read=245049 dirtied=54 written=7280 -> Hash Join (cost=39452.94..1740698.50 rows=24832 width=16) (actual time=1195.813..10808.963 rows=24387 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1692140 read=245049 dirtied=54 written=7280 -> Nested Loop (cost=422.26..1700953.89 rows=124160 width=20) (actual time=10.619..9525.203 rows=121443 loops=1) Buffers: shared hit=1576850 read=214184 dirtied=54 written=7254 -> Nested Loop (cost=421.82..1501005.38 rows=408347 width=16) (actual time=10.400..4660.365 rows=399793 loops=1) Buffers: shared hit=295710 read=173099 dirtied=54 written=5710 -> Bitmap Heap Scan on part (cost=417.11..28331.61 rows=13507 width=4) (actual time=10.205..163.531 rows=13288 loops=1) Recheck Cond: ((p_type)::text = 'MEDIUM ANODIZED BRASS'::text) Heap Blocks: exact=11356 Buffers: shared hit=3806 read=7633 written=319 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..413.73 rows=13507 width=0) (actual time=7.253..7.253 rows=13288 loops=1) Index Cond: ((p_type)::text = 'MEDIUM ANODIZED BRASS'::text) Buffers: shared read=83 -> Bitmap Heap Scan on lineitem (cost=4.72..108.72 rows=31 width=20) (actual time=0.043..0.326 rows=30 loops=13288) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=402220 Buffers: shared hit=291904 read=165466 dirtied=54 written=5391 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_l_shipmode_idx (cost=0.00..4.71 rows=31 width=0) (actual time=0.028..0.028 rows=30 loops=13288) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=41622 read=13528 written=421 -> Index Scan using orders_o_orderkey_o_orderdate_idx on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.011..0.011 rows=0 loops=399793) Index Cond: ((o_orderkey = lineitem.l_orderkey) AND (o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=1281140 read=41085 written=1544 -> Hash (cost=35280.69..35280.69 rows=300000 width=4) (actual time=1180.095..1180.095 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=115290 read=30865 written=26 -> Nested Loop (cost=906.18..35280.69 rows=300000 width=4) (actual time=31.703..1063.069 rows=299838 loops=1) Buffers: shared hit=115290 read=30865 written=26 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.071..0.099 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..0.015 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.029..0.029 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=0.022..0.023 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=21.399..200.477 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Heap Blocks: exact=145317 Buffers: shared hit=115288 read=30865 written=26 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.11 rows=60000 width=0) (actual time=14.160..14.160 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=831 written=1 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.007..0.008 rows=1 loops=24387) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73281 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.033..0.033 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=0.005..0.010 rows=25 loops=1) Buffers: shared hit=1 Planning time: 12.187 ms Execution time: 11107.593 ms (70 rows) COMMIT; COMMIT