explain.depesz.com

PostgreSQL's explain analyze made readable

Result: efRN

Settings
# exclusive inclusive rows x rows loops node
1. 0.019 130.938 ↓ 1.3 4 1

Hash Join (cost=14,159.87..25,976.63 rows=3 width=110) (actual time=102.743..130.938 rows=4 loops=1)

  • Hash Cond: (c.event_id = cet.id)
2. 0.013 130.910 ↓ 1.3 4 1

Hash Left Join (cost=14,158.81..25,975.46 rows=3 width=95) (actual time=102.722..130.910 rows=4 loops=1)

  • Hash Cond: (c.event_id = "grouping".event_id)
3. 28.192 28.192 ↓ 1.3 4 1

Seq Scan on coupon c (cost=0.00..11,816.62 rows=3 width=87) (actual time=0.008..28.192 rows=4 loops=1)

  • Filter: (mapping_target = 0)
  • Rows Removed by Filter: 91726
4. 0.012 102.705 ↑ 1.0 4 1

Hash (cost=14,158.76..14,158.76 rows=4 width=24) (actual time=102.705..102.705 rows=4 loops=1)

  • Buckets: 1024 Batches: 1 Memory Usage: 9kB
5. 0.001 102.693 ↓ 1.2 5 1

Subquery Scan on grouping (cost=14,158.62..14,158.76 rows=4 width=24) (actual time=102.689..102.693 rows=5 loops=1)

6. 0.009 102.692 ↓ 1.2 5 1

Finalize GroupAggregate (cost=14,158.62..14,158.72 rows=4 width=40) (actual time=102.688..102.692 rows=5 loops=1)

  • Group Key: c1.event_id
7. 0.000 102.683 ↓ 1.4 11 1

Sort (cost=14,158.62..14,158.64 rows=8 width=24) (actual time=102.682..102.683 rows=11 loops=1)

  • Sort Key: c1.event_id
  • Sort Method: quicksort Memory: 25kB
8. 12.693 102.767 ↓ 1.4 11 1

Gather (cost=14,157.66..14,158.50 rows=8 width=24) (actual time=99.000..102.767 rows=11 loops=1)

  • Workers Planned: 2
  • Workers Launched: 2
9. 10.756 90.074 ↑ 1.0 4 3 / 3

Partial HashAggregate (cost=13,157.66..13,157.70 rows=4 width=24) (actual time=90.073..90.074 rows=4 loops=3)

  • Group Key: c1.event_id
10. 10.561 79.318 ↑ 1.3 27,299 3 / 3

Hash Left Join (cost=1,578.83..12,816.22 rows=34,144 width=28) (actual time=42.347..79.318 rows=27,299 loops=3)

  • Hash Cond: (c1.id = ce.coupon_id)
11. 26.688 26.688 ↑ 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=0.003..26.688 rows=27,299 loops=3)

  • Filter: (type = 0)
  • Rows Removed by Filter: 3278
12. 20.645 42.069 ↑ 1.0 54,659 3 / 3

Hash (cost=895.59..895.59 rows=54,659 width=20) (actual time=42.069..42.069 rows=54,659 loops=3)

  • Buckets: 65536 Batches: 1 Memory Usage: 3288kB
13. 21.424 21.424 ↑ 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..21.424 rows=54,659 loops=3)

14. 0.004 0.009 ↓ 1.3 4 1

Hash (cost=1.03..1.03 rows=3 width=29) (actual time=0.009..0.009 rows=4 loops=1)

  • Buckets: 1024 Batches: 1 Memory Usage: 9kB
15. 0.005 0.005 ↓ 1.3 4 1

Seq Scan on coupon_event cet (cost=0.00..1.03 rows=3 width=29) (actual time=0.004..0.005 rows=4 loops=1)

Planning time : 0.457 ms
Execution time : 131.446 ms