explain.depesz.com

PostgreSQL's explain analyze made readable

Result: yIw2

Settings
# exclusive inclusive rows x rows loops node
1. 0.000 5,844.579 ↑ 267.2 4 1

Finalize GroupAggregate (cost=42,354.34..42,502.48 rows=1,069 width=248) (actual time=5,844.024..5,844.579 rows=4 loops=1)

  • Group Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone))
2. 0.000 5,870.429 ↑ 74.2 12 1

Gather Merge (cost=42,354.34..42,472.64 rows=890 width=248) (actual time=5,843.720..5,870.429 rows=12 loops=1)

  • Workers Planned: 2
  • Workers Launched: 2
3. 3.282 12,066.363 ↑ 111.2 4 3

Partial GroupAggregate (cost=41,354.32..41,369.89 rows=445 width=248) (actual time=4,021.280..4,022.121 rows=4 loops=3)

  • Group Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone))
4. 6.093 12,063.081 ↑ 1.3 343 3

Sort (cost=41,354.32..41,355.43 rows=445 width=228) (actual time=4,020.972..4,021.027 rows=343 loops=3)

  • Sort Key: n1.n_name, n2.n_name, (date_part('year'::text, (lineitem.l_shipdate)::timestamp without time zone))
  • Sort Method: quicksort Memory: 85kB
5. 93.549 12,056.988 ↑ 1.3 343 3

Hash Join (cost=374.34..41,334.74 rows=445 width=228) (actual time=134.496..4,018.996 rows=343 loops=3)

  • Hash Cond: (customer.c_nationkey = n2.n_nationkey)
  • Join Filter: (((n1.n_name = 'INDIA'::bpchar) AND (n2.n_name = 'FRANCE'::bpchar)) OR ((n1.n_name = 'FRANCE'::bpchar) AND (n2.n_name = 'INDIA'::bpchar)))
  • Rows Removed by Join Filter: 335
6. 45.625 11,962.488 ↑ 1.2 8,665 3

Nested Loop (cost=372.94..41,303.00 rows=10,705 width=128) (actual time=40.676..3,987.496 rows=8,665 loops=3)

7. 76.114 11,552.919 ↑ 1.2 8,665 3

Nested Loop (cost=372.52..36,451.80 rows=10,705 width=128) (actual time=40.610..3,850.973 rows=8,665 loops=3)

8. 171.051 11,112.861 ↑ 1.2 8,665 3

Hash Join (cost=372.10..28,761.53 rows=10,705 width=128) (actual time=40.469..3,704.287 rows=8,665 loops=3)

  • Hash Cond: (lineitem.l_suppkey = supplier.s_suppkey)
9. 10,917.294 10,917.294 ↑ 1.3 106,367 3

Parallel Seq Scan on lineitem (cost=0.00..27,780.60 rows=133,808 width=32) (actual time=32.251..3,639.098 rows=106,367 loops=3)

  • Filter: ((l_shipdate >= '1995-01-01'::date) AND (l_shipdate <= '1996-12-31'::date))
  • Rows Removed by Filter: 243158
10. 1.221 24.516 ↓ 1.0 817 3

Hash (cost=362.10..362.10 rows=800 width=108) (actual time=8.172..8.172 rows=817 loops=3)

  • Buckets: 1024 Batches: 1 Memory Usage: 58kB
11. 9.318 23.295 ↓ 1.0 817 3

Hash Join (cost=1.40..362.10 rows=800 width=108) (actual time=0.355..7.765 rows=817 loops=3)

  • Hash Cond: (supplier.s_nationkey = n1.n_nationkey)
12. 13.812 13.812 ↑ 1.0 10,000 3

Seq Scan on supplier (cost=0.00..330.00 rows=10,000 width=12) (actual time=0.253..4.604 rows=10,000 loops=3)

13. 0.051 0.165 ↑ 1.0 2 3

Hash (cost=1.38..1.38 rows=2 width=108) (actual time=0.055..0.055 rows=2 loops=3)

  • Buckets: 1024 Batches: 1 Memory Usage: 9kB
14. 0.114 0.114 ↑ 1.0 2 3

Seq Scan on nation n1 (cost=0.00..1.38 rows=2 width=108) (actual time=0.026..0.038 rows=2 loops=3)

  • Filter: ((n_name = 'INDIA'::bpchar) OR (n_name = 'FRANCE'::bpchar))
  • Rows Removed by Filter: 23
15. 363.944 363.944 ↑ 1.0 1 25,996

Index Scan using orders_pkey on orders (cost=0.42..0.72 rows=1 width=12) (actual time=0.014..0.014 rows=1 loops=25,996)

  • Index Cond: (o_orderkey = lineitem.l_orderkey)
16. 363.944 363.944 ↑ 1.0 1 25,996

Index Scan using customer_pkey on customer (cost=0.42..0.45 rows=1 width=12) (actual time=0.014..0.014 rows=1 loops=25,996)

  • Index Cond: (c_custkey = orders.o_custkey)
17. 0.066 0.951 ↑ 1.0 2 3

Hash (cost=1.38..1.38 rows=2 width=108) (actual time=0.317..0.317 rows=2 loops=3)

  • Buckets: 1024 Batches: 1 Memory Usage: 9kB
18. 0.885 0.885 ↑ 1.0 2 3

Seq Scan on nation n2 (cost=0.00..1.38 rows=2 width=108) (actual time=0.279..0.295 rows=2 loops=3)

  • Filter: ((n_name = 'FRANCE'::bpchar) OR (n_name = 'INDIA'::bpchar))
  • Rows Removed by Filter: 23