explain.depesz.com

PostgreSQL's explain analyze made readable

Result: wyJX

Settings
# exclusive inclusive rows x rows loops node
1. 0.724 517.700 ↑ 1.0 753 1

Sort (cost=8,667.12..8,669.01 rows=757 width=99) (actual time=517.615..517.700 rows=753 loops=1)

  • Sort Key: (count(post.id)) DESC
  • Sort Method: quicksort Memory: 161kB
2. 237.747 516.976 ↑ 1.0 753 1

HashAggregate (cost=8,623.35..8,630.92 rows=757 width=99) (actual time=516.744..516.976 rows=753 loops=1)

  • Group Key: card.id
3. 220.017 279.229 ↓ 4.6 890,723 1

Hash Join (cost=4,496.83..7,663.30 rows=192,010 width=95) (actual time=36.051..279.229 rows=890,723 loops=1)

  • Hash Cond: (post_to_tag_link_1.tag_id = tag.id)
4. 17.887 55.167 ↑ 1.0 32,633 1

Hash Join (cost=4,385.07..5,305.10 rows=32,633 width=8) (actual time=31.977..55.167 rows=32,633 loops=1)

  • Hash Cond: (post_to_tag_link_1.post_id = post.id)
5. 5.637 5.637 ↑ 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..5.637 rows=32,633 loops=1)

6. 10.214 31.643 ↑ 1.0 24,492 1

Hash (cost=4,078.92..4,078.92 rows=24,492 width=4) (actual time=31.643..31.643 rows=24,492 loops=1)

  • Buckets: 32768 Batches: 1 Memory Usage: 1118kB
7. 21.429 21.429 ↑ 1.0 24,492 1

Seq Scan on post (cost=0.00..4,078.92 rows=24,492 width=4) (actual time=0.011..21.429 rows=24,492 loops=1)

8. 0.921 4.045 ↑ 1.0 1,318 1

Hash (cost=95.29..95.29 rows=1,318 width=99) (actual time=4.045..4.045 rows=1,318 loops=1)

  • Buckets: 2048 Batches: 1 Memory Usage: 196kB
9. 0.707 3.124 ↑ 1.0 1,318 1

Hash Join (cost=40.07..95.29 rows=1,318 width=99) (actual time=1.324..3.124 rows=1,318 loops=1)

  • Hash Cond: (card_to_tag_link_1.tag_id = tag.id)
10. 0.836 2.191 ↑ 1.0 1,318 1

Hash Join (cost=30.03..67.12 rows=1,318 width=95) (actual time=1.075..2.191 rows=1,318 loops=1)

  • Hash Cond: (card_to_tag_link_1.card_id = card.id)
11. 0.374 0.374 ↑ 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=0.057..0.374 rows=1,318 loops=1)

12. 0.541 0.981 ↑ 1.0 757 1

Hash (cost=20.57..20.57 rows=757 width=91) (actual time=0.981..0.981 rows=757 loops=1)

  • Buckets: 1024 Batches: 1 Memory Usage: 104kB
13. 0.440 0.440 ↑ 1.0 757 1

Seq Scan on card (cost=0.00..20.57 rows=757 width=91) (actual time=0.013..0.440 rows=757 loops=1)

14. 0.086 0.226 ↑ 1.0 224 1

Hash (cost=7.24..7.24 rows=224 width=4) (actual time=0.226..0.226 rows=224 loops=1)

  • Buckets: 1024 Batches: 1 Memory Usage: 16kB
15. 0.140 0.140 ↑ 1.0 224 1

Seq Scan on tag (cost=0.00..7.24 rows=224 width=4) (actual time=0.015..0.140 rows=224 loops=1)