BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select n_name, sum(l_extendedprice * (1 - l_discount)) as revenue from customer, orders, lineitem, supplier, nation, region where c_custkey = o_custkey and l_orderkey = o_orderkey and l_suppkey = s_suppkey and c_nationkey = s_nationkey and s_nationkey = n_nationkey and n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' and o_orderdate >= date '1993-01-01' and o_orderdate < date '1993-01-01' + interval '1 year' group by n_name order by revenue desc; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2446341.12..2446341.18 rows=25 width=34) (actual time=130721.963..130721.963 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=1057284 read=430793 dirtied=253 written=389 -> HashAggregate (cost=2446340.29..2446340.54 rows=25 width=34) (actual time=130721.870..130721.873 rows=5 loops=1) Buffers: shared hit=1057281 read=430793 dirtied=253 written=389 -> Hash Join (cost=403004.16..2445605.97 rows=73432 width=34) (actual time=23255.554..130449.257 rows=73643 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=1057281 read=430793 dirtied=253 written=389 -> Hash Join (cost=398325.16..2403470.35 rows=1836115 width=46) (actual time=23085.323..125642.111 rows=1823764 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=1055099 read=430793 dirtied=253 written=389 -> Seq Scan on lineitem (cost=0.00..1683562.69 rows=60644269 width=16) (actual time=0.130..53894.185 rows=60044872 loops=1) Buffers: shared hit=653599 read=423521 -> Hash (cost=392585.84..392585.84 rows=459146 width=38) (actual time=23084.611..23084.611 rows=455943 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32059kB Buffers: shared hit=401500 read=7272 dirtied=253 written=389 -> Hash Join (cost=88895.44..392585.84 rows=459146 width=38) (actual time=5736.647..22642.177 rows=455943 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=401500 read=7272 dirtied=253 written=389 -> Bitmap Heap Scan on orders (cost=49853.22..340343.17 rows=2295730 width=8) (actual time=2362.225..11841.797 rows=2279304 loops=1) Recheck Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=256174 read=6441 dirtied=253 written=285 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49279.29 rows=2295730 width=0) (actual time=2238.695..2238.695 rows=2301704 loops=1) Index Cond: ((o_orderdate >= '1993-01-01'::date) AND (o_orderdate < '1994-01-01 00:00:00'::timestamp without time zone)) Buffers: shared hit=385 read=6188 written=285 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=3374.162..3374.162 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21083kB Buffers: shared hit=145326 read=831 written=104 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=62.821..3124.438 rows=299838 loops=1) Buffers: shared hit=145326 read=831 written=104 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.052..0.159 rows=5 loops=1) Join Filter: (nation.n_regionkey = region.r_regionkey) Rows Removed by Join Filter: 20 Buffers: shared hit=3 -> Index Scan using pk_nation on nation (cost=0.00..12.63 rows=25 width=34) (actual time=0.011..0.049 rows=25 loops=1) Buffers: shared hit=2 -> Materialize (cost=0.00..1.07 rows=1 width=4) (actual time=0.002..0.002 rows=1 loops=25) Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.024..0.025 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=49.066..599.848 rows=59968 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=145323 read=831 written=104 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=37.392..37.392 rows=59968 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=6 read=831 written=104 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=163.496..163.496 rows=100000 loops=1) Buckets: 16384 Batches: 1 Memory Usage: 3907kB Buffers: shared hit=2179 -> Seq Scan on supplier (cost=0.00..3179.00 rows=100000 width=8) (actual time=0.013..117.022 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 130735.137 ms (55 rows) COMMIT; COMMIT