explain.depesz.com

PostgreSQL's explain analyze made readable

Result: t25a

Settings
# exclusive inclusive rows x rows loops node
1. 0.005 0.392 ↑ 1.0 10 1

Limit (cost=46,041.46..46,041.49 rows=10 width=548) (actual time=0.387..0.392 rows=10 loops=1)

2. 0.012 0.387 ↑ 212,271.6 10 1

Sort (cost=46,041.46..51,348.25 rows=2,122,716 width=548) (actual time=0.387..0.387 rows=10 loops=1)

  • Sort Key: changes_y2018.change_date DESC
  • Sort Method: quicksort Memory: 30kB
3. 0.009 0.375 ↑ 212,271.6 10 1

Nested Loop (cost=1.43..170.33 rows=2,122,716 width=548) (actual time=0.224..0.375 rows=10 loops=1)

4. 0.010 0.126 ↑ 1.0 10 1

HashAggregate (cost=1.01..1.11 rows=10 width=4) (actual time=0.122..0.126 rows=10 loops=1)

  • Group Key: (unnest(patient_logs.change_ids))
5. 0.002 0.116 ↑ 1.0 10 1

Limit (cost=0.43..0.88 rows=10 width=8) (actual time=0.084..0.116 rows=10 loops=1)

6. 0.016 0.114 ↑ 1,870.0 10 1

ProjectSet (cost=0.43..850.59 rows=18,700 width=8) (actual time=0.084..0.114 rows=10 loops=1)

7. 0.098 0.098 ↑ 20.8 9 1

Index Scan Backward using patient_logs_patient_id_change_date_key on patient_logs (cost=0.43..755.69 rows=187 width=29) (actual time=0.081..0.098 rows=9 loops=1)

  • Index Cond: (patient_id = 386)
8. 0.020 0.240 ↑ 2.0 1 10

Append (cost=0.43..16.90 rows=2 width=548) (actual time=0.023..0.024 rows=1 loops=10)

9. 0.080 0.080 ↓ 0.0 0 10

Index Scan using changes_y2018_change_id_change_date_idx on changes_y2018 (cost=0.43..8.45 rows=1 width=548) (actual time=0.008..0.008 rows=0 loops=10)

  • Index Cond: (change_id = (unnest(patient_logs.change_ids)))
10. 0.140 0.140 ↑ 1.0 1 10

Index Scan using changes_y2019_change_id_change_date_idx on changes_y2019 (cost=0.43..8.45 rows=1 width=548) (actual time=0.013..0.014 rows=1 loops=10)

  • Index Cond: (change_id = (unnest(patient_logs.change_ids)))