explain.depesz.com

PostgreSQL's explain analyze made readable

Result: AH5b

Settings
# exclusive inclusive rows x rows loops node
1. 0.003 256.375 ↓ 2.0 2 1

Group (cost=31,922.73..31,922.74 rows=1 width=18) (actual time=256.373..256.375 rows=2 loops=1)

  • Group Key: ap.id, (true)
2. 0.012 256.372 ↓ 2.0 2 1

Sort (cost=31,922.73..31,922.73 rows=1 width=17) (actual time=256.372..256.372 rows=2 loops=1)

  • Sort Key: ap.id, (true)
  • Sort Method: quicksort Memory: 25kB
3. 0.000 256.360 ↓ 2.0 2 1

Nested Loop Left Join (cost=1,008.87..31,922.72 rows=1 width=17) (actual time=132.466..256.360 rows=2 loops=1)

  • Join Filter: (apa.attendance_period_id = ap.id)
4. 0.006 0.035 ↓ 2.0 2 1

Nested Loop (cost=0.56..16.61 rows=1 width=16) (actual time=0.015..0.035 rows=2 loops=1)

5. 0.011 0.011 ↓ 2.0 2 1

Index Scan using attendances_patient_id_idx on attendances a (cost=0.28..8.30 rows=1 width=16) (actual time=0.008..0.011 rows=2 loops=1)

  • Index Cond: (patient_id = '54d9df16-5371-11e8-80ea-034fb4ed6904'::uuid)
6. 0.018 0.018 ↑ 1.0 1 2

Index Scan using attendance_periods_attendance_id_idx on attendance_periods ap (cost=0.28..8.30 rows=1 width=32) (actual time=0.007..0.009 rows=1 loops=2)

  • Index Cond: (attendance_id = a.id)
7. 7.612 258.000 ↓ 0.0 0 2

Gather (cost=1,008.30..31,864.34 rows=3,341 width=17) (actual time=128.159..129.000 rows=0 loops=2)

  • Workers Planned: 2
  • Workers Launched: 2
8. 117.340 250.388 ↓ 0.0 0 6 / 3

Hash Join (cost=8.30..30,530.24 rows=1,392 width=17) (actual time=125.193..125.194 rows=0 loops=6)

  • Hash Cond: (apa.user_group_id = uug.user_group_id)
9. 133.010 133.010 ↑ 1.4 473,833 6 / 3

Parallel Seq Scan on attendance_period_acl apa (cost=0.00..28,712.00 rows=683,600 width=32) (actual time=0.019..66.505 rows=473,833 loops=6)

10. 0.005 0.038 ↑ 1.0 1 5 / 3

Hash (cost=8.29..8.29 rows=1 width=16) (actual time=0.023..0.023 rows=1 loops=5)

  • Buckets: 1024 Batches: 1 Memory Usage: 9kB
11. 0.033 0.033 ↑ 1.0 1 5 / 3

Index Scan using users_user_groups_user_id_idx on users_user_groups uug (cost=0.27..8.29 rows=1 width=16) (actual time=0.019..0.020 rows=1 loops=5)

  • Index Cond: (user_id = '67228252-86e1-48a9-b78d-1361694f75b5'::uuid)
Planning time : 0.562 ms
Execution time : 258.108 ms