explain.depesz.com

PostgreSQL's explain analyze made readable

Result: aRuP

Settings
# exclusive inclusive rows x rows loops node
1. 0.610 509.642 ↑ 1.0 753 1

Sort (cost=8,331.49..8,333.38 rows=757 width=99) (actual time=509.563..509.642 rows=753 loops=1)

  • Sort Key: (count(post.id)) DESC
  • Sort Method: quicksort Memory: 161kB
2. 238.219 509.032 ↑ 1.0 753 1

HashAggregate (cost=8,287.72..8,295.28 rows=757 width=99) (actual time=508.812..509.032 rows=753 loops=1)

  • Group Key: card.id
3. 222.818 270.813 ↓ 5.2 890,723 1

Hash Join (cost=4,490.44..7,423.81 rows=172,780 width=95) (actual time=26.686..270.813 rows=890,723 loops=1)

  • Hash Cond: (post_to_tag_link_1.tag_id = tag.id)
4. 16.635 44.291 ↑ 1.0 32,633 1

Hash Join (cost=4,385.07..5,305.10 rows=32,633 width=8) (actual time=22.954..44.291 rows=32,633 loops=1)

  • Hash Cond: (post_to_tag_link_1.post_id = post.id)
5. 5.016 5.016 ↑ 1.0 32,633 1

Seq Scan on post_to_tag_link post_to_tag_link_1 (cost=0.00..471.33 rows=32,633 width=8) (actual time=0.016..5.016 rows=32,633 loops=1)

6. 9.079 22.640 ↑ 1.0 24,492 1

Hash (cost=4,078.92..4,078.92 rows=24,492 width=4) (actual time=22.640..22.640 rows=24,492 loops=1)

  • Buckets: 32768 Batches: 1 Memory Usage: 1118kB
7. 13.561 13.561 ↑ 1.0 24,492 1

Seq Scan on post (cost=0.00..4,078.92 rows=24,492 width=4) (actual time=0.011..13.561 rows=24,492 loops=1)

8. 0.872 3.704 ↓ 1.1 1,318 1

Hash (cost=90.55..90.55 rows=1,186 width=99) (actual time=3.704..3.704 rows=1,318 loops=1)

  • Buckets: 2048 Batches: 1 Memory Usage: 196kB
9. 0.715 2.832 ↓ 1.1 1,318 1

Hash Join (cost=40.07..90.55 rows=1,186 width=99) (actual time=1.041..2.832 rows=1,318 loops=1)

  • Hash Cond: (card_to_tag_link_1.tag_id = tag.id)
10. 0.866 1.945 ↓ 1.1 1,318 1

Hash Join (cost=30.03..64.20 rows=1,186 width=95) (actual time=0.847..1.945 rows=1,318 loops=1)

  • Hash Cond: (card_to_tag_link_1.card_id = card.id)
11. 0.280 0.280 ↓ 1.1 1,318 1

Seq Scan on card_to_tag_link card_to_tag_link_1 (cost=0.00..17.86 rows=1,186 width=8) (actual time=0.016..0.280 rows=1,318 loops=1)

12. 0.496 0.799 ↑ 1.0 757 1

Hash (cost=20.57..20.57 rows=757 width=91) (actual time=0.799..0.799 rows=757 loops=1)

  • Buckets: 1024 Batches: 1 Memory Usage: 104kB
13. 0.303 0.303 ↑ 1.0 757 1

Seq Scan on card (cost=0.00..20.57 rows=757 width=91) (actual time=0.011..0.303 rows=757 loops=1)

14. 0.090 0.172 ↑ 1.0 224 1

Hash (cost=7.24..7.24 rows=224 width=4) (actual time=0.172..0.172 rows=224 loops=1)

  • Buckets: 1024 Batches: 1 Memory Usage: 16kB
15. 0.082 0.082 ↑ 1.0 224 1

Seq Scan on tag (cost=0.00..7.24 rows=224 width=4) (actual time=0.015..0.082 rows=224 loops=1)