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From: Purav Chovatia <puravc@gmail.com>
Date: Tue, 24 Oct 2017 17:09:01 +0530
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 <CADrzpjFY3tSdrGwrOMSX7B6bPNY22xnkCjRDMmVG3Fsi+SCh2w@mail.gmail.com>
Subject: Re: postgresql tuning with perf
To: legrand legrand <legrand_legrand@hotmail.com>
Cc: pgsql-performance@postgresql.org
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Hi Pascal,

Do you mean the sample program that acts as the application, do you want me
to share that? I can do that, but I guess my post will get blocked.

Yes, c1 is the PK. Pls see below:
bmdb=# desc dept_new
      Table "public.dept_new"
 Column |     Type      | Modifiers
--------+---------------+-----------
 c1     | numeric(10,0) | not null
 c2     | numeric(10,0) |
.
.
.
.
.
 c205   | numeric(10,0) |
Indexes:
    "dept_new_pkey" PRIMARY KEY, btree (c1)

bmdb=#

We dont analyze after loading the table. But I guess thats required only if
the query plan is in doubt, lets say its doing a full table scan or alike,
isnt it? That is not the case. The query is using PK index but it just
seems to be slow.

Thanks

On 24 October 2017 at 01:59, legrand legrand <legrand_legrand@hotmail.com>
wrote:

> Hi,
> could you providence the code used with PG ?
> Has table dept_new an index/pk on c1 ?
> Do you analyze this table after loading it ?
>
> Regards
> PAscal
>
>
>
> --
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> f2050081.html
>
>
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<div dir=3D"ltr">Hi Pascal,<div><br></div><div>Do you mean the sample progr=
am that acts as the application, do you want me to share that? I can do tha=
t, but I guess my post will get blocked.</div><div><br></div><div>Yes, c1 i=
s the PK. Pls see below:</div><div><div style=3D"font-size:12.8px">bmdb=3D#=
 desc dept_new</div><div style=3D"font-size:12.8px">=C2=A0 =C2=A0 =C2=A0 Ta=
ble &quot;public.dept_new&quot;</div><div style=3D"font-size:12.8px">=C2=A0=
Column |=C2=A0 =C2=A0 =C2=A0Type=C2=A0 =C2=A0 =C2=A0 | Modifiers</div><div =
style=3D"font-size:12.8px">--------+---------------+-----<wbr>------</div><=
div style=3D"font-size:12.8px">=C2=A0c1=C2=A0 =C2=A0 =C2=A0| numeric(10,0) =
| not null</div><div style=3D"font-size:12.8px">=C2=A0c2=C2=A0 =C2=A0 =C2=
=A0| numeric(10,0) |</div><div style=3D"font-size:12.8px">.</div><div style=
=3D"font-size:12.8px">.</div><div style=3D"font-size:12.8px">.</div><div st=
yle=3D"font-size:12.8px">.</div><div style=3D"font-size:12.8px">.</div><div=
 style=3D"font-size:12.8px">=C2=A0c205=C2=A0 =C2=A0| numeric(10,0) |</div><=
div style=3D"font-size:12.8px">Indexes:</div><div style=3D"font-size:12.8px=
">=C2=A0 =C2=A0 &quot;dept_new_pkey&quot; PRIMARY KEY, btree (c1)</div><div=
 style=3D"font-size:12.8px"><br></div><div style=3D"font-size:12.8px">bmdb=
=3D#</div></div><div><br></div><div>We dont analyze after loading the table=
. But I guess thats required only if the query plan is in doubt, lets say i=
ts doing a full table scan or alike, isnt it? That is not the case. The que=
ry is using PK index but it just seems to be slow.</div><div><br></div><div=
>Thanks</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quote=
">On 24 October 2017 at 01:59, legrand legrand <span dir=3D"ltr">&lt;<a hre=
f=3D"mailto:legrand_legrand@hotmail.com" target=3D"_blank">legrand_legrand@=
hotmail.com</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
could you providence the code used with PG ?<br>
Has table dept_new an index/pk on c1 ?<br>
Do you analyze this table after loading it ?<br>
<br>
Regards<br>
PAscal<br>
<br>
<br>
<br>
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Sent from: <a href=3D"http://www.postgresql-archive.org/PostgreSQL-performa=
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ql-archive.<wbr>org/PostgreSQL-performance-<wbr>f2050081.html</a><br>
<span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
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</font></span></blockquote></div><br></div>

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