explain.depesz.com

PostgreSQL's explain analyze made readable

Result: LDOo

Settings
# exclusive inclusive rows x rows loops node
1. 0.009 2.266 ↓ 6.0 36 1

Append (cost=1.50..39.33 rows=6 width=296) (actual time=0.089..2.266 rows=36 loops=1)

2. 0.014 0.311 ↓ 2.2 9 1

Nested Loop Left Join (cost=1.50..28.71 rows=4 width=296) (actual time=0.088..0.311 rows=9 loops=1)

3. 0.015 0.153 ↓ 2.2 9 1

Nested Loop (cost=1.39..23.41 rows=4 width=88) (actual time=0.063..0.153 rows=9 loops=1)

4. 0.036 0.072 ↑ 1.0 11 1

Bitmap Heap Scan on conversations sc (cost=1.33..9.47 rows=11 width=40) (actual time=0.044..0.072 rows=11 loops=1)

  • Recheck Cond: ((member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid) OR (other_member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid))
  • Heap Blocks: exact=9
5. 0.001 0.036 ↓ 0.0 0 1

BitmapOr (cost=1.33..1.33 rows=11 width=0) (actual time=0.036..0.036 rows=0 loops=1)

6. 0.021 0.021 ↑ 1.0 6 1

Bitmap Index Scan on conversations_member_guid_idx (cost=0.00..0.67 rows=6 width=0) (actual time=0.021..0.021 rows=6 loops=1)

  • Index Cond: (member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid)
7. 0.014 0.014 ↑ 1.0 5 1

Bitmap Index Scan on conversations_other_member_guid_idx (cost=0.00..0.66 rows=5 width=0) (actual time=0.014..0.014 rows=5 loops=1)

  • Index Cond: (other_member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid)
8. 0.066 0.066 ↑ 1.0 1 11

Index Scan using conversations_pk on conversations pc (cost=0.06..1.27 rows=1 width=56) (actual time=0.006..0.006 rows=1 loops=11)

  • Index Cond: (conversation_id = sc.conversation_id)
9. 0.144 0.144 ↑ 1.0 1 9

Index Scan using member_profiles_pk on member_profiles mp (cost=0.11..1.32 rows=1 width=200) (actual time=0.016..0.016 rows=1 loops=9)

  • Index Cond: (member_guid = CASE WHEN ('66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid IS DISTINCT FROM sc.member_guid) THEN sc.member_guid ELSE sc.other_member_guid END)
10. 1.350 1.946 ↓ 13.5 27 1

Nested Loop (cost=1.55..10.53 rows=2 width=296) (actual time=0.312..1.946 rows=27 loops=1)

11. 0.019 0.488 ↓ 13.5 27 1

Nested Loop Left Join (cost=1.43..7.78 rows=2 width=256) (actual time=0.058..0.488 rows=27 loops=1)

12. 0.039 0.118 ↓ 13.5 27 1

Bitmap Heap Scan on mutual sm (cost=1.32..5.13 rows=2 width=56) (actual time=0.042..0.118 rows=27 loops=1)

  • Recheck Cond: ((member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid) OR (other_member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid))
  • Filter: ((member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid) OR ((other_member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid) AND (NOT (alternatives: SubPlan 1 or hashed SubPlan 2))))
  • Rows Removed by Filter: 1
  • Heap Blocks: exact=3
13. 0.000 0.030 ↓ 0.0 0 1

BitmapOr (cost=1.32..1.32 rows=2 width=0) (actual time=0.030..0.030 rows=0 loops=1)

14. 0.020 0.020 ↓ 23.0 23 1

Bitmap Index Scan on mutual_member_guid_idx (cost=0.00..0.66 rows=1 width=0) (actual time=0.020..0.020 rows=23 loops=1)

  • Index Cond: (member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid)
15. 0.010 0.010 ↓ 8.0 8 1

Bitmap Index Scan on mutual_other_member_guid_idx (cost=0.00..0.66 rows=1 width=0) (actual time=0.010..0.010 rows=8 loops=1)

  • Index Cond: (other_member_guid = '66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid)
16.          

SubPlan (for Bitmap Heap Scan)

17. 0.049 0.049 ↓ 0.0 0 7

Index Scan using conversations_other_member_guid_idx on conversations sc_1 (cost=0.06..1.27 rows=1 width=0) (actual time=0.007..0.007 rows=0 loops=7)

  • Index Cond: (other_member_guid = sm.other_member_guid)
  • Filter: (member_guid = sm.member_guid)
  • Rows Removed by Filter: 4
18. 0.000 0.000 ↓ 0.0 0

Seq Scan on conversations sc_2 (cost=0.00..134.36 rows=2,936 width=32) (never executed)

19. 0.351 0.351 ↓ 0.0 0 27

Index Scan using member_profiles_pk on member_profiles mp_1 (cost=0.11..1.32 rows=1 width=216) (actual time=0.013..0.013 rows=0 loops=27)

  • Index Cond: (member_guid = CASE WHEN ('66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid IS DISTINCT FROM sm.member_guid) THEN sm.member_guid ELSE sm.other_member_guid END)
20. 0.108 0.108 ↑ 1.0 1 27

Index Scan using member_profiles_pk on member_profiles mp2 (cost=0.11..1.32 rows=1 width=32) (actual time=0.004..0.004 rows=1 loops=27)

  • Index Cond: (member_guid = CASE WHEN ('66964ee7-4dca-55ab-9431-450b2e74b9ca'::uuid IS DISTINCT FROM sm.member_guid) THEN sm.other_member_guid ELSE sm.member_guid END)
Planning time : 1.148 ms