explain.depesz.com

PostgreSQL's explain analyze made readable

Result: oxYC : modify_partial on mapping_target

Settings
# exclusive inclusive rows x rows loops node
1. 0.012 102.706 ↓ 1.3 4 1

Merge Join (cost=14,171.87..14,172.12 rows=3 width=110) (actual time=102.694..102.706 rows=4 loops=1)

  • Merge Cond: (c.event_id = cett.id)
2. 0.007 102.677 ↓ 1.3 4 1

Merge Left Join (cost=14,170.81..14,171.01 rows=3 width=95) (actual time=102.669..102.677 rows=4 loops=1)

  • Merge Cond: (c.event_id = c1.event_id)
3. 0.008 0.019 ↓ 1.3 4 1

Sort (cost=12.20..12.21 rows=3 width=87) (actual time=0.018..0.019 rows=4 loops=1)

  • Sort Key: c.event_id
  • Sort Method: quicksort Memory: 25kB
4. 0.011 0.011 ↓ 1.3 4 1

Index Scan using coupon_mapping_primary_index on coupon c (cost=0.13..12.18 rows=3 width=87) (actual time=0.007..0.011 rows=4 loops=1)

5. 0.007 102.651 ↓ 1.2 5 1

Materialize (cost=14,158.62..14,158.77 rows=4 width=24) (actual time=102.647..102.651 rows=5 loops=1)

6. 0.006 102.644 ↓ 1.2 5 1

Finalize GroupAggregate (cost=14,158.62..14,158.72 rows=4 width=40) (actual time=102.641..102.644 rows=5 loops=1)

  • Group Key: c1.event_id
7. 0.000 102.638 ↓ 1.5 12 1

Sort (cost=14,158.62..14,158.64 rows=8 width=24) (actual time=102.637..102.638 rows=12 loops=1)

  • Sort Key: c1.event_id
  • Sort Method: quicksort Memory: 25kB
8. 11.962 102.675 ↓ 1.5 12 1

Gather (cost=14,157.66..14,158.50 rows=8 width=24) (actual time=102.615..102.675 rows=12 loops=1)

  • Workers Planned: 2
  • Workers Launched: 2
9. 10.311 90.713 ↑ 1.0 4 3 / 3

Partial HashAggregate (cost=13,157.66..13,157.70 rows=4 width=24) (actual time=90.712..90.713 rows=4 loops=3)

  • Group Key: c1.event_id
10. 13.186 80.402 ↑ 1.3 27,299 3 / 3

Hash Left Join (cost=1,578.83..12,816.22 rows=34,144 width=28) (actual time=39.706..80.402 rows=27,299 loops=3)

  • Hash Cond: (c1.id = ce.coupon_id)
11. 27.772 27.772 ↑ 1.3 27,299 3 / 3

Parallel Seq Scan on coupon c1 (cost=0.00..11,147.76 rows=34,144 width=40) (actual time=0.004..27.772 rows=27,299 loops=3)

  • Filter: (type = 0)
  • Rows Removed by Filter: 3278
12. 26.620 39.444 ↑ 1.0 54,659 3 / 3

Hash (cost=895.59..895.59 rows=54,659 width=20) (actual time=39.444..39.444 rows=54,659 loops=3)

  • Buckets: 65536 Batches: 1 Memory Usage: 3288kB
13. 12.824 12.824 ↑ 1.0 54,659 3 / 3

Seq Scan on coupon_ext ce (cost=0.00..895.59 rows=54,659 width=20) (actual time=0.013..12.824 rows=54,659 loops=3)

14. 0.011 0.017 ↓ 1.3 4 1

Sort (cost=1.05..1.06 rows=3 width=29) (actual time=0.017..0.017 rows=4 loops=1)

  • Sort Key: cett.id
  • Sort Method: quicksort Memory: 25kB
15. 0.006 0.006 ↓ 1.3 4 1

Seq Scan on coupon_event cett (cost=0.00..1.03 rows=3 width=29) (actual time=0.005..0.006 rows=4 loops=1)

Planning time : 0.497 ms
Execution time : 103.151 ms