explain.depesz.com

PostgreSQL's explain analyze made readable

Result: lsI2

Settings
# exclusive inclusive rows x rows loops node
1. 0.611 507.382 ↑ 1.0 753 1

Sort (cost=8,667.12..8,669.01 rows=757 width=99) (actual time=507.293..507.382 rows=753 loops=1)

  • Sort Key: (count(post.id)) DESC
  • Sort Method: quicksort Memory: 161kB
2. 241.018 506.771 ↑ 1.0 753 1

HashAggregate (cost=8,623.35..8,630.92 rows=757 width=99) (actual time=506.554..506.771 rows=753 loops=1)

  • Group Key: card.id
3. 215.671 265.753 ↓ 4.6 890,723 1

Hash Join (cost=4,496.83..7,663.30 rows=192,010 width=95) (actual time=27.447..265.753 rows=890,723 loops=1)

  • Hash Cond: (post_to_tag_link_1.tag_id = tag.id)
4. 17.615 46.298 ↑ 1.0 32,633 1

Hash Join (cost=4,385.07..5,305.10 rows=32,633 width=8) (actual time=23.613..46.298 rows=32,633 loops=1)

  • Hash Cond: (post_to_tag_link_1.post_id = post.id)
5. 5.400 5.400 ↑ 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..5.400 rows=32,633 loops=1)

6. 9.379 23.283 ↑ 1.0 24,492 1

Hash (cost=4,078.92..4,078.92 rows=24,492 width=4) (actual time=23.283..23.283 rows=24,492 loops=1)

  • Buckets: 32768 Batches: 1 Memory Usage: 1118kB
7. 13.904 13.904 ↑ 1.0 24,492 1

Seq Scan on post (cost=0.00..4,078.92 rows=24,492 width=4) (actual time=0.012..13.904 rows=24,492 loops=1)

8. 0.922 3.784 ↑ 1.0 1,318 1

Hash (cost=95.29..95.29 rows=1,318 width=99) (actual time=3.784..3.784 rows=1,318 loops=1)

  • Buckets: 2048 Batches: 1 Memory Usage: 196kB
9. 0.730 2.862 ↑ 1.0 1,318 1

Hash Join (cost=40.07..95.29 rows=1,318 width=99) (actual time=1.070..2.862 rows=1,318 loops=1)

  • Hash Cond: (card_to_tag_link_1.tag_id = tag.id)
10. 0.842 1.932 ↑ 1.0 1,318 1

Hash Join (cost=30.03..67.12 rows=1,318 width=95) (actual time=0.848..1.932 rows=1,318 loops=1)

  • Hash Cond: (card_to_tag_link_1.card_id = card.id)
11. 0.291 0.291 ↑ 1.0 1,318 1

Seq Scan on card_to_tag_link card_to_tag_link_1 (cost=0.00..19.18 rows=1,318 width=8) (actual time=0.015..0.291 rows=1,318 loops=1)

12. 0.456 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. 0.343 0.343 ↑ 1.0 757 1

Seq Scan on card (cost=0.00..20.57 rows=757 width=91) (actual time=0.012..0.343 rows=757 loops=1)

14. 0.105 0.200 ↑ 1.0 224 1

Hash (cost=7.24..7.24 rows=224 width=4) (actual time=0.200..0.200 rows=224 loops=1)

  • Buckets: 1024 Batches: 1 Memory Usage: 16kB
15. 0.095 0.095 ↑ 1.0 224 1

Seq Scan on tag (cost=0.00..7.24 rows=224 width=4) (actual time=0.015..0.095 rows=224 loops=1)