explain.depesz.com

PostgreSQL's explain analyze made readable

Result: hEJd

Settings
# exclusive inclusive rows x rows loops node
1. 0.004 0.285 ↑ 1.0 10 1

Limit (cost=46,160.47..46,160.49 rows=10 width=548) (actual time=0.281..0.285 rows=10 loops=1)

2. 0.013 0.281 ↑ 212,822.3 10 1

Sort (cost=46,160.47..51,481.02 rows=2,128,223 width=548) (actual time=0.280..0.281 rows=10 loops=1)

  • Sort Key: changes_y2018.change_date DESC
  • Sort Method: quicksort Memory: 30kB
3. 0.010 0.268 ↑ 212,822.3 10 1

Nested Loop (cost=1.43..170.33 rows=2,128,223 width=548) (actual time=0.095..0.268 rows=10 loops=1)

4. 0.009 0.058 ↑ 1.0 10 1

HashAggregate (cost=1.01..1.11 rows=10 width=4) (actual time=0.055..0.058 rows=10 loops=1)

  • Group Key: (unnest(patient_logs.change_ids))
5. 0.002 0.049 ↑ 1.0 10 1

Limit (cost=0.43..0.88 rows=10 width=8) (actual time=0.031..0.049 rows=10 loops=1)

6. 0.009 0.047 ↑ 1,880.0 10 1

ProjectSet (cost=0.43..855.12 rows=18,800 width=8) (actual time=0.031..0.047 rows=10 loops=1)

7. 0.038 0.038 ↑ 20.9 9 1

Index Scan Backward using patient_logs_patient_id_change_date_key on patient_logs (cost=0.43..759.71 rows=188 width=29) (actual time=0.028..0.038 rows=9 loops=1)

  • Index Cond: (patient_id = 386)
8. 0.010 0.200 ↑ 2.0 1 10

Append (cost=0.43..16.90 rows=2 width=548) (actual time=0.020..0.020 rows=1 loops=10)

9. 0.040 0.040 ↓ 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=0.004..0.004 rows=0 loops=10)

  • Index Cond: (change_id = (unnest(patient_logs.change_ids)))
10. 0.150 0.150 ↑ 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=0.015..0.015 rows=1 loops=10)

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