ea1.txt

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                                                                        QUERY PLAN                                                                        
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 Seq Scan on box b  (cost=0.00..3669095.76 rows=128 width=8) (actual time=0.147..431517.693 rows=128 loops=1)
   SubPlan 1
     ->  Hash Anti Join  (cost=14742.77..28664.79 rows=19239 width=8) (actual time=2960.176..3370.425 rows=1 loops=128)
           Hash Cond: (m1.box_id = m2.box_id)
           Join Filter: (m1.id < m2.id)
           ->  Bitmap Heap Scan on message m1  (cost=544.16..13696.88 rows=28858 width=16) (actual time=2.320..6.204 rows=18487 loops=128)
                 Recheck Cond: (box_id = b.id)
                 ->  Bitmap Index Scan on "message_box_Idx"  (cost=0.00..536.94 rows=28858 width=0) (actual time=2.251..2.251 rows=18487 loops=128)
                       Index Cond: (box_id = b.id)
           ->  Hash  (cost=13696.88..13696.88 rows=28858 width=16) (actual time=12.632..12.632 rows=19720 loops=120)
                 Buckets: 4096  Batches: 4 (originally 2)  Memory Usage: 1787kB
                 ->  Bitmap Heap Scan on message m2  (cost=544.16..13696.88 rows=28858 width=16) (actual time=1.668..6.619 rows=19720 loops=120)
                       Recheck Cond: (box_id = b.id)
                       ->  Bitmap Index Scan on "message_box_Idx"  (cost=0.00..536.94 rows=28858 width=0) (actual time=1.602..1.602 rows=19720 loops=120)
                             Index Cond: (box_id = b.id)
 Total runtime: 431520.186 ms