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help / color / mirror / Atom feedFrom: Adrian Klaver <adrian.klaver@aklaver.com>
To: Bert <biertie@gmail.com>
Cc: PostgreSQL (SQL) <pgsql-sql@postgresql.org>
Subject: Re: plan not correct?
Date: Mon, 21 Mar 2016 09:04:31 -0700
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On 03/21/2016 08:29 AM, Bert wrote:
> That is easy to check.
>
> Let's do the same test again:
> # select count(1) from dlp.st_itemseat;
> count
> -------
> 12
> (1 row)
>
> # select count(1) from loaddlp.st_itemseat_insert;
> count
> -------
> 87 --> of which 12 are already in the dlp.st_itemseat table
> (1 row)
>
> # explain analyze <upsert query>*
> QUERY PLAN
> -----------------------------------------------------------------------------------------------------------------------------------------------------------------
> Insert on st_itemseat (cost=55.47..69.97 rows=150 width=228) (actual
> time=2.345..2.345 rows=0 loops=1)
> CTE upsert
> -> Update on st_itemseat et (cost=17.50..55.42 rows=2 width=240)
> (actual time=0.493..0.545 rows=12 loops=1)
> -> Hash Join (cost=17.50..55.42 rows=2 width=240) (actual
> time=0.303..0.318 rows=12 loops=1)
> Hash Cond: ((et.tick_server_id =
> st_itemseat_insert_1.tick_server_id) AND (et.itemseat_id =
> st_itemseat_insert_1.itemseat_id))
> -> Seq Scan on st_itemseat et (cost=0.00..13.10
> rows=310 width=14) (actual time=0.025..0.028 rows=12 loops=1)
> -> Hash (cost=13.00..13.00 rows=300 width=234)
> (actual time=0.244..0.244 rows=87 loops=1)
> Buckets: 1024 Batches: 1 Memory Usage: 13kB
> -> Seq Scan on st_itemseat_insert
> st_itemseat_insert_1 (cost=0.00..13.00 rows=300 width=234) (actual
> time=0.005..0.120 rows=87 loops=1)
> -> Seq Scan on st_itemseat_insert (cost=0.04..14.54 rows=150
> width=228) (actual time=0.637..0.726 rows=75 loops=1)
> Filter: (NOT (hashed SubPlan 2))
> Rows Removed by Filter: 12
> SubPlan 2
> -> CTE Scan on upsert (cost=0.00..0.04 rows=2 width=8)
> (actual time=0.498..0.561 rows=12 loops=1)
> Planning time: 1.122 ms
> Execution time: 2.682 ms
>
> # <upsert query>*
> INSERT 0 0
>
> # select count(1) from dlp.st_itemseat;
> count
> -------
> 87
> (1 row)
>
>
> * the upsert query can be found attached to the first mail, but the
> difference is that the 'where loadtabletime' is removed
>
> As you can see the in the update part of the explain the 'rows' nr is
> 12. Which is what is expected.
> But the rows on the insert are again 0, while it should be 75.
They are seen, including the 12 rows that are filtered out for updating:
" -> Seq Scan on st_itemseat_insert (cost=0.04..14.54 rows=150
width=228) (actual time=0.637..0.726 rows=75 loops=1)
Filter: (NOT (hashed SubPlan 2))
Rows Removed by Filter: 12
SubPlan 2
"
I do not know why that value is not propagated up to 'Insert on
st_itemseat ...'.
>
> wkr,
> Bert
>
--
Adrian Klaver
adrian.klaver@aklaver.com
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Cc: adrian.klaver@aklaver.com, biertie@gmail.com
Subject: Re: plan not correct?
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