From: Boris Mironov <boris_mironov@outlook.com>
To: "pgsql-hackers@postgresql.org" <pgsql-hackers@postgresql.org>
Subject: Idea to enhance pgbench by more modes to generate data (multi-TXNs,
 UNNEST, COPY BINARY)
Thread-Topic: Idea to enhance pgbench by more modes to generate data
 (multi-TXNs, UNNEST, COPY BINARY)
Thread-Index: AQHcUwuRPlzLCtdZw06GAdoL15fmHQ==
Date: Tue, 11 Nov 2025 13:33:16 +0000
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Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Hello hackers,

For some of my specific hardware tests I needed to generate big databases w=
ell beyond RAM size. Hence I turned to pgbench tool and its default 2 modes=
 for client- and server-side generation for TPC-B tests. When I use "scale"=
 factor in range of few thousands (eg, 3000 - 5000) data generation phase t=
akes quite some time. I looked at it as opportunity to prove/disprove 2 hyp=
othesises:

  *
will INSERT mode work faster if we commit once every "scale" and turn singl=
e INSERT into "for" loop with commits for 3 tables in the end of each loop
  *
will "INSERT .. SELECT FROM unnest" be faster than "INSERT .. SELECT FROM g=
enerate_series"
  *
will BINARY mode work faster than TEXT even though we send much more data
  *
and so on

As a result of my experiments I produced significant patch for pgbench util=
ity and though that it might be of interest not just for me. Therefore I'm =
sending draft version of it in diff format for current development tree on =
GitHub. As of November 11, 2025 I can merge with main branch of the project=
 on GitHub.

Spoiler alert: "COPY FROM BINARY" is significantly faster than current "COP=
Y FROM TEXT"

Would be happy to polish it if there is interest to such change.

Cheers

--_000_DS0PR08MB9565D91414C65B3AC363825488CFADS0PR08MB9565namp_
Content-Type: text/html; charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

<html>
<head>
<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Diso-8859-=
1">
<style type=3D"text/css" style=3D"display:none;"> P {margin-top:0;margin-bo=
ttom:0;} </style>
</head>
<body dir=3D"ltr">
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Hello hackers,</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
For some of my specific hardware tests I needed to generate big databases w=
ell beyond RAM size. Hence I turned to pgbench tool and its default 2 modes=
 for client- and server-side generation for TPC-B tests. When I use &quot;s=
cale&quot; factor in range of few thousands
 (eg, 3000 - 5000) data generation phase takes quite some time. I looked at=
 it as opportunity to prove/disprove 2 hypothesises:</div>
<ul style=3D"margin-top: 0px; margin-bottom: 0px;" data-editing-info=3D"{&q=
uot;applyListStyleFromLevel&quot;:false,&quot;unorderedStyleType&quot;:2}">
<li style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt; =
color: rgb(0, 0, 0); list-style-type: &quot;- &quot;;">
<div role=3D"presentation" class=3D"elementToProof">will INSERT mode work f=
aster if we commit once every &quot;scale&quot; and turn single INSERT into=
 &quot;for&quot; loop with commits for 3 tables in the end of each loop</di=
v>
</li><li style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 1=
2pt; color: rgb(0, 0, 0); list-style-type: &quot;- &quot;;">
<div class=3D"elementToProof" role=3D"presentation">will &quot;INSERT .. SE=
LECT FROM unnest&quot; be faster than &quot;INSERT .. SELECT FROM generate_=
series&quot;</div>
</li><li style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 1=
2pt; color: rgb(0, 0, 0); list-style-type: &quot;- &quot;;">
<div role=3D"presentation" class=3D"elementToProof">will BINARY mode work f=
aster than TEXT even though we send much more data</div>
</li><li style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 1=
2pt; color: rgb(0, 0, 0); list-style-type: &quot;- &quot;;">
<div role=3D"presentation" class=3D"elementToProof">and so on</div>
</li></ul>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
As a result of my experiments I produced significant patch for pgbench util=
ity and though that it might be of interest not just for me. Therefore I'm =
sending draft version of it in diff format for current development tree on =
GitHub. As of November 11, 2025
 I can merge with main branch of the project on GitHub.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Spoiler alert: &quot;COPY FROM BINARY&quot; is significantly faster than cu=
rrent &quot;COPY FROM TEXT&quot;</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Would be happy to polish it if there is interest to such change.</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
<br>
</div>
<div style=3D"font-family: Calibri, Helvetica, sans-serif; font-size: 12pt;=
 color: rgb(0, 0, 0);" class=3D"elementToProof">
Cheers</div>
</body>
</html>

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