BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'SAUDI ARABIA' 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 NICKEL' ) as all_nations group by o_year order by o_year; QUERY PLAN ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=1769964.42..1769966.24 rows=729 width=38) (actual time=11995.961..11995.961 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=1994101 read=303618 -> HashAggregate (cost=1769917.00..1769929.76 rows=729 width=38) (actual time=11995.917..11995.917 rows=2 loops=1) Group Key: date_part('year'::text, (orders.o_orderdate)::timestamp without time zone) Buffers: shared hit=1994098 read=303618 -> Hash Join (cost=38759.48..1769414.52 rows=25124 width=38) (actual time=2014.504..11956.218 rows=24334 loops=1) Hash Cond: (supplier.s_nationkey = n2.n_nationkey) Buffers: shared hit=1994098 read=303618 -> Nested Loop (cost=38757.91..1768941.88 rows=25124 width=16) (actual time=2014.453..11916.948 rows=24334 loops=1) Buffers: shared hit=1994094 read=303618 -> Hash Join (cost=38757.62..1760822.10 rows=25165 width=16) (actual time=2014.429..11773.683 rows=24334 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=1920999 read=303601 -> Nested Loop (cost=427.47..1721768.46 rows=125825 width=20) (actual time=6.986..9694.849 rows=120187 loops=1) Buffers: shared hit=1744603 read=303599 -> Nested Loop (cost=427.04..1518349.26 rows=415424 width=16) (actual time=6.935..4642.337 rows=395503 loops=1) Buffers: shared hit=272010 read=192143 -> Bitmap Heap Scan on part (cost=422.39..28532.74 rows=13673 width=4) (actual time=6.856..166.652 rows=13184 loops=1) Recheck Cond: ((p_type)::text = 'MEDIUM ANODIZED NICKEL'::text) Heap Blocks: exact=11231 Buffers: shared hit=2 read=11311 -> Bitmap Index Scan on part_p_type_p_partkey_idx (cost=0.00..418.98 rows=13673 width=0) (actual time=4.636..4.636 rows=13184 loops=1) Index Cond: ((p_type)::text = 'MEDIUM ANODIZED NICKEL'::text) Buffers: shared read=82 -> Bitmap Heap Scan on lineitem (cost=4.65..108.65 rows=31 width=20) (actual time=0.044..0.325 rows=30 loops=13184) Recheck Cond: (l_partkey = part.p_partkey) Heap Blocks: exact=398955 Buffers: shared hit=272008 read=180832 -> Bitmap Index Scan on lineitem_l_partkey_l_quantity_idx (cost=0.00..4.64 rows=31 width=0) (actual time=0.023..0.023 rows=30 loops=13184) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=39893 read=13992 -> Index Scan using pk_orders on orders (cost=0.43..0.48 rows=1 width=12) (actual time=0.012..0.012 rows=0 loops=395503) Index Cond: (o_orderkey = lineitem.l_orderkey) Filter: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Rows Removed by Filter: 1 Buffers: shared hit=1472593 read=111456 -> Hash (cost=34580.15..34580.15 rows=300000 width=4) (actual time=2005.348..2005.348 rows=299838 loops=1) Buckets: 524288 Batches: 1 Memory Usage: 14638kB Buffers: shared hit=176396 read=2 -> Nested Loop (cost=766.08..34580.15 rows=300000 width=4) (actual time=3.702..1917.784 rows=299838 loops=1) Buffers: shared hit=176396 read=2 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.030..0.050 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=0.004..0.010 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: 9kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.009..0.010 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=765.00..6315.54 rows=60000 width=8) (actual time=3.626..374.376 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Rows Removed by Index Recheck: 1440032 Heap Blocks: lossy=176390 Buffers: shared hit=176394 read=2 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_brin_idx (cost=0.00..750.00 rows=60000 width=0) (actual time=3.595..3.595 rows=353280 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=4 read=2 -> Index Scan using pk_supplier on supplier (cost=0.29..0.31 rows=1 width=8) (actual time=0.005..0.005 rows=1 loops=24334) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73095 read=17 -> Hash (cost=1.25..1.25 rows=25 width=30) (actual time=0.020..0.020 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=0.003..0.007 rows=25 loops=1) Buffers: shared hit=1 Planning time: 6.366 ms Execution time: 11996.549 ms (73 rows) COMMIT; COMMIT