Created
February 15, 2018 12:07
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| QUERY PLAN | |
| -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | |
| Limit (cost=98624.84..98624.96 rows=10 width=74) (actual time=8234.723..8234.816 rows=10 loops=1) | |
| Buffers: shared hit=10314 read=2 dirtied=1 | |
| -> Sort (cost=98624.84..99874.84 rows=500000 width=74) (actual time=8234.713..8234.740 rows=10 loops=1) | |
| Sort Key: posts.id DESC | |
| Sort Method: top-N heapsort Memory: 26kB | |
| Buffers: shared hit=10314 read=2 dirtied=1 | |
| -> Hash Join (cost=17.92..29077.92 rows=500000 width=74) (actual time=1.381..7835.510 rows=100742 loops=1) | |
| Hash Cond: (posts.user_id = users.id) | |
| Buffers: shared hit=10314 read=2 dirtied=1 | |
| -> Seq Scan on posts (cost=0.00..20310.00 rows=1000000 width=49) (actual time=0.019..3707.714 rows=1000000 loops=1) | |
| Buffers: shared hit=10310 | |
| -> Hash (cost=17.29..17.29 rows=50 width=49) (actual time=1.324..1.324 rows=10 loops=1) | |
| Buckets: 1024 Batches: 1 Memory Usage: 9kB | |
| Buffers: shared hit=4 read=2 dirtied=1 | |
| -> Hash Join (cost=14.88..17.29 rows=50 width=49) (actual time=0.222..1.264 rows=10 loops=1) | |
| Hash Cond: (users.id = friends.friend_user_id) | |
| Buffers: shared hit=4 read=2 dirtied=1 | |
| -> Seq Scan on users (cost=0.00..2.00 rows=100 width=41) (actual time=0.009..0.509 rows=100 loops=1) | |
| Buffers: shared hit=1 | |
| -> Hash (cost=14.76..14.76 rows=9 width=8) (actual time=0.180..0.180 rows=10 loops=1) | |
| Buckets: 1024 Batches: 1 Memory Usage: 9kB | |
| Buffers: shared hit=3 read=2 dirtied=1 | |
| -> Bitmap Heap Scan on friends (cost=4.22..14.76 rows=9 width=8) (actual time=0.062..0.113 rows=10 loops=1) | |
| Recheck Cond: (user_id = 1) | |
| Heap Blocks: exact=1 | |
| Buffers: shared hit=3 read=2 dirtied=1 | |
| -> Bitmap Index Scan on friends_user_id_friend_user_id_key (cost=0.00..4.22 rows=9 width=0) (actual time=0.040..0.040 rows=10 loops=1) | |
| Index Cond: (user_id = 1) | |
| Buffers: shared hit=3 read=1 | |
| Planning time: 0.839 ms | |
| Execution time: 8234.921 ms | |
| (31 rows) |
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