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 = 'ASIA' 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=2455846.26..2455846.32 rows=25 width=34) (actual time=152541.460..152541.460 rows=5 loops=1) Sort Key: (sum((lineitem.l_extendedprice * (1::double precision - lineitem.l_discount)))) Sort Method: quicksort Memory: 25kB Buffers: shared hit=837556 read=655907 dirtied=361 written=2284 -> HashAggregate (cost=2455845.43..2455845.68 rows=25 width=34) (actual time=152541.375..152541.380 rows=5 loops=1) Buffers: shared hit=837553 read=655907 dirtied=361 written=2284 -> Hash Join (cost=404424.12..2455108.20 rows=73723 width=34) (actual time=34734.747..152214.068 rows=73063 loops=1) Hash Cond: ((lineitem.l_suppkey = supplier.s_suppkey) AND (customer.c_nationkey = supplier.s_nationkey)) Buffers: shared hit=837553 read=655907 dirtied=361 written=2284 -> Hash Join (cost=399745.12..2412824.37 rows=1843380 width=46) (actual time=34528.365..146811.469 rows=1821634 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=835371 read=655907 dirtied=361 written=2284 -> Seq Scan on lineitem (cost=0.00..1690224.29 rows=60884229 width=16) (actual time=0.043..61539.345 rows=59984748 loops=1) Buffers: shared hit=528102 read=553280 written=1 -> Hash (cost=393983.11..393983.11 rows=460961 width=38) (actual time=34527.726..34527.726 rows=455587 loops=1) Buckets: 65536 Batches: 1 Memory Usage: 32034kB Buffers: shared hit=307269 read=102627 dirtied=361 written=2283 -> Hash Join (cost=89092.44..393983.11 rows=460961 width=38) (actual time=8317.370..34056.630 rows=455587 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=307269 read=102627 dirtied=361 written=2283 -> Bitmap Heap Scan on orders (cost=50050.23..341688.27 rows=2304803 width=8) (actual time=2640.515..20663.194 rows=2277137 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=161928 read=101729 dirtied=361 written=2283 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..49474.03 rows=2304803 width=0) (actual time=2498.141..2498.141 rows=2310711 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 read=6603 -> Hash (cost=35292.22..35292.22 rows=300000 width=38) (actual time=5676.556..5676.556 rows=300270 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 21113kB Buffers: shared hit=145341 read=898 -> Nested Loop (cost=905.09..35292.22 rows=300000 width=38) (actual time=57.524..5409.057 rows=300270 loops=1) Buffers: shared hit=145341 read=898 -> Nested Loop (cost=0.00..14.07 rows=5 width=30) (actual time=0.068..0.202 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=0.012..0.074 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=0.027..0.028 rows=1 loops=1) Filter: (r_name = 'ASIA'::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=49.006..1055.135 rows=60054 loops=5) Recheck Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=145338 read=898 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=38.831..38.831 rows=60054 loops=5) Index Cond: (c_nationkey = nation.n_nationkey) Buffers: shared hit=5 read=831 -> Hash (cost=3179.00..3179.00 rows=100000 width=8) (actual time=206.161..206.161 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=0.010..157.090 rows=100000 loops=1) Buffers: shared hit=2179 Total runtime: 152557.041 ms (55 rows) COMMIT; COMMIT