explain.depesz.com

PostgreSQL's explain analyze made readable

Result: sg35

Settings

Optimization(s) for this plan:

# exclusive inclusive rows x rows loops node
1. 0.002 0.042 ↑ 1.0 1 1

Limit (cost=0.42..8.99 rows=1 width=189) (actual time=0.041..0.042 rows=1 loops=1)

2. 0.001 0.040 ↑ 21.0 1 1

Nested Loop Left Join (cost=0.42..180.31 rows=21 width=189) (actual time=0.040..0.040 rows=1 loops=1)

  • Join Filter: (nodeslogical.nl_id = wifiaccesspointsassignmenthistory.wapah_nl_id)
  • Rows Removed by Join Filter: 4
3. 0.001 0.034 ↑ 21.0 1 1

Nested Loop Left Join (cost=0.42..104.81 rows=21 width=35) (actual time=0.034..0.034 rows=1 loops=1)

4. 0.002 0.031 ↑ 21.0 1 1

Nested Loop (cost=0.28..52.89 rows=21 width=37) (actual time=0.031..0.031 rows=1 loops=1)

  • Join Filter: (wifiaccesspoints.wap_basemac = wifiaeroscouttagspositionhistory.watph_wap_basemac)
  • Rows Removed by Join Filter: 5
5. 0.023 0.023 ↑ 21.0 1 1

Index Only Scan using watph_wat_mac_index on wifiaeroscouttagspositionhistory (cost=0.28..50.05 rows=21 width=22) (actual time=0.023..0.023 rows=1 loops=1)

  • Index Cond: ((watph_wat_mac = '00:0c:cc:49:17:64'::macaddr) AND (watph_wap_basemac IS NOT NULL))
  • Heap Fetches: 1
6. 0.002 0.006 ↑ 1.0 6 1

Materialize (cost=0.00..1.09 rows=6 width=15) (actual time=0.005..0.006 rows=6 loops=1)

7. 0.004 0.004 ↑ 1.0 6 1

Seq Scan on wifiaccesspoints (cost=0.00..1.06 rows=6 width=15) (actual time=0.003..0.004 rows=6 loops=1)

8. 0.002 0.002 ↓ 0.0 0 1

Index Scan using wapah_unique_active_mac on wifiaccesspointsassignmenthistory (cost=0.14..2.45 rows=1 width=10) (actual time=0.002..0.002 rows=0 loops=1)

  • Index Cond: (wapah_basemac = wifiaeroscouttagspositionhistory.watph_wap_basemac)
9. 0.001 0.005 ↑ 50.0 4 1

Materialize (cost=0.00..13.00 rows=200 width=158) (actual time=0.004..0.005 rows=4 loops=1)

10. 0.004 0.004 ↑ 50.0 4 1

Seq Scan on nodeslogical (cost=0.00..12.00 rows=200 width=158) (actual time=0.003..0.004 rows=4 loops=1)