Date: Wed, 12 Nov 2025 10:26:45 +0800
From: "zhenwei.li@sfere-elec.com" <zhenwei.li@sfere-elec.com>
To: "Sam Stearns" <sam.stearns@dat.com>,
	"Fabrice Chapuis" <fabrice636861@gmail.com>,
	"Laurenz Albe" <laurenz.albe@cybertec.at>,
	"Ron Johnson" <ronljohnsonjr@gmail.com>
Cc: Pgsql-admin <pgsql-admin@lists.postgresql.org>,
	"Henry Ashu" <henry.ashu@dat.com>
Subject: Re: Re: Postgres Parameters
References: 
 <CAN6TVj=QOuZDGdZegGN1ac0GPM7DgoYMBAWOJHLM68KprMAW1Q@mail.gmail.com>,
	<CAA5-nLBPuxwQdZ0mFNMTP9kyQ+b9qY9PYKKWf=Q+SRxJS1iiKg@mail.gmail.com>,
	<CAN6TVjmO7Tqd1RKqcjrD2LFFcrmSThx+CNuhjWKNHSGO6HVNEQ@mail.gmail.com>
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Content-Type: text/html;
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3Dutf-8"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; =
margin-bottom: 0px; margin-left: 0.5em; }ol, ul { margin-top: 0px; margin-=
bottom: 0px; list-style-position: inside; }p { margin-top: 0px; margin-bot=
tom: 0px; }div.FoxDiv20251112102032948800 { }body { font-size: 14px; font-=
family: "Microsoft YaHei UI"; color: rgb(0, 0, 0); line-height: 1.5; }</st=
yle></head><body>=0A<div><span></span><div data-page-id=3D"ZF1RfQVjCdlzsMc=
AXvEcaKm7nAM" data-lark-html-role=3D"root" data-docx-has-block-data=3D"fal=
se"><div class=3D"ace-line ace-line old-record-id-UNOBf9Qtldz4hwcd0rVc5mCg=
nuc">I found that PostgreSQL 15.3 doesn't support the <code>pg_stat_checkp=
ointer</code> view. We can use <code>pg_stat_bgwriter</code> instead. The =
SQL is as follows:</div><div class=3D"ace-line ace-line old-record-id-UNOB=
f9Qtldz4hwcd0rVc5mCgnuc"><div data-page-id=3D"ZF1RfQVjCdlzsMcAXvEcaKm7nAM"=
 data-lark-html-role=3D"root" data-docx-has-block-data=3D"false"><pre clas=
s=3D"ace-line ace-line old-record-id-LWMefbLXCdPWMbceJatcWoLZnte"><code cl=
ass=3D"language-Plain Text" data-lark-language=3D"Plain Text" data-wrap=3D=
"false">SELECT=0A  checkpoints_timed AS num_timed,  -- Checkpoints trigger=
ed by timeout=0A  checkpoints_req AS num_requested,  -- Checkpoints trigge=
red by requests (like when WAL space is tight)=0A  round(=0A    (checkpoin=
ts_req::numeric / NULLIF(checkpoints_timed + checkpoints_req, 0)) * 100, =
=0A    2=0A  ) AS requested_pct  -- % of checkpoints that were request-tri=
ggered=0AFROM pg_stat_bgwriter;</code></pre></div><span data-lark-record-d=
ata=3D"{&quot;rootId&quot;:&quot;ZF1RfQVjCdlzsMcAXvEcaKm7nAM&quot;,&quot;t=
ext&quot;:{&quot;initialAttributedTexts&quot;:{&quot;text&quot;:{&quot;0&q=
uot;:&quot;SELECT\n  checkpoints_timed AS num_timed,  -- Checkpoints trigg=
ered by timeout\n  checkpoints_req AS num_requested,  -- Checkpoints trigg=
ered by requests (like when WAL space is tight)\n  round(\n    (checkpoint=
s_req::numeric / NULLIF(checkpoints_timed + checkpoints_req, 0)) * 100, \n=
    2\n  ) AS requested_pct  -- % of checkpoints that were request-trigger=
ed\nFROM pg_stat_bgwriter;&quot;},&quot;attribs&quot;:{&quot;0&quot;:&quot=
;*0|7+9w*0+m&quot;}},&quot;apool&quot;:{&quot;numToAttrib&quot;:{&quot;0&q=
uot;:[&quot;author&quot;,&quot;3551853419709152&quot;]},&quot;nextNum&quot=
;:1}},&quot;type&quot;:&quot;text&quot;,&quot;referenceRecordMap&quot;:{},=
&quot;extra&quot;:{&quot;channel&quot;:&quot;saas&quot;,&quot;pasteRandomI=
d&quot;:&quot;9d6f1a25-d787-49a1-b746-ad921f0ed53f&quot;,&quot;mention_pag=
e_title&quot;:{},&quot;external_mention_url&quot;:{}},&quot;isKeepQuoteCon=
tainer&quot;:false,&quot;isFromCode&quot;:true,&quot;selection&quot;:[{&qu=
ot;id&quot;:15,&quot;type&quot;:&quot;text&quot;,&quot;selection&quot;:{&q=
uot;start&quot;:0,&quot;end&quot;:378},&quot;recordId&quot;:&quot;LWMefbLX=
CdPWMbceJatcWoLZnte&quot;}],&quot;payloadMap&quot;:{},&quot;isCut&quot;:fa=
lse}" data-lark-record-format=3D"docx/text" class=3D"lark-record-clipboard=
"></span></div></div><span data-lark-record-data=3D"{&quot;rootId&quot;:&q=
uot;ZF1RfQVjCdlzsMcAXvEcaKm7nAM&quot;,&quot;text&quot;:{&quot;initialAttri=
butedTexts&quot;:{&quot;text&quot;:{&quot;0&quot;:&quot;I found that Postg=
reSQL 15.3 doesn't support the pg_stat_checkpointer view. We should use pg=
_stat_bgwriter instead. The correct SQL is as follows:&quot;},&quot;attrib=
s&quot;:{&quot;0&quot;:&quot;*0+1d*0*1+k*0+l*0*1+g*0+14&quot;}},&quot;apoo=
l&quot;:{&quot;numToAttrib&quot;:{&quot;0&quot;:[&quot;author&quot;,&quot;=
3551853419709152&quot;],&quot;1&quot;:[&quot;inlineCode&quot;,&quot;true&q=
uot;]},&quot;nextNum&quot;:2}},&quot;type&quot;:&quot;text&quot;,&quot;ref=
erenceRecordMap&quot;:{},&quot;extra&quot;:{&quot;channel&quot;:&quot;saas=
&quot;,&quot;pasteRandomId&quot;:&quot;f697a529-b8fb-46a9-85d3-e95d225415f=
b&quot;,&quot;mention_page_title&quot;:{},&quot;external_mention_url&quot;=
:{}},&quot;isKeepQuoteContainer&quot;:false,&quot;isFromCode&quot;:false,&=
quot;selection&quot;:[{&quot;id&quot;:16,&quot;type&quot;:&quot;text&quot;=
,&quot;selection&quot;:{&quot;start&quot;:0,&quot;end&quot;:146},&quot;rec=
ordId&quot;:&quot;UNOBf9Qtldz4hwcd0rVc5mCgnuc&quot;}],&quot;payloadMap&quo=
t;:{},&quot;isCut&quot;:false}" data-lark-record-format=3D"docx/text" clas=
s=3D"lark-record-clipboard"></span></div>=0A<div><br></div>=0A<blockquote =
style=3D"margin-Top: 0px; margin-Bottom: 0px; margin-Left: 0.5em; margin-R=
ight: inherit"><div>&nbsp;</div><div style=3D"border:none;border-top:solid=
 #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: 8px=
; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; BAC=
KGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:</b>=
&nbsp;<a href=3D"mailto:sam.stearns@dat.com">Sam Stearns</a></div><div><b>=
Date:</b>&nbsp;2025-11-11&nbsp;23:24</div><div><b>To:</b>&nbsp;<a href=3D"=
mailto:fabrice636861@gmail.com">Fabrice Chapuis</a>; <a href=3D"mailto:lau=
renz.albe@cybertec.at">Laurenz Albe</a>; <a href=3D"mailto:ronljohnsonjr@g=
mail.com">Ron Johnson</a></div><div><b>CC:</b>&nbsp;<a href=3D"mailto:pgsq=
l-admin@lists.postgresql.org">Pgsql-admin</a>; <a href=3D"mailto:henry.ash=
u@dat.com">Henry Ashu</a></div><div><b>Subject:</b>&nbsp;Re: Postgres Para=
meters</div></div></div><div><div class=3D"FoxDiv20251112102032948800"><di=
v dir=3D"ltr">Awesome stuff.&nbsp; Thank you, everyone!<div><br></div><div=
>Sam</div><div><br></div></div><br><div class=3D"gmail_quote gmail_quote_c=
ontainer"><div dir=3D"ltr" class=3D"gmail_attr">On Tue, Nov 11, 2025 at 3:=
19=E2=80=AFAM Fabrice Chapuis &lt;<a href=3D"mailto:fabrice636861@gmail.co=
m">fabrice636861@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><div class=3D"msg1055502942438550695">=0A<div =
style=3D"font-size:1px;color:rgb(255,255,255);line-height:1px;max-height:0=
px;opacity:0;overflow:hidden;display:none">=0AHi, You could also use this =
query, if the ratio is low, that means there is no pressure on wal size an=
d you can keep the max_wal_size value as it is. SELECT num_timed, num_requ=
ested, round((num_requested:=E2=80=8A:=E2=80=8Anumeric / NULLIF(num_timed =
+ num_requested,</div>=0A<div style=3D"font-size:1px;color:rgb(255,255,255=
);line-height:1px;max-height:0px;opacity:0;overflow:hidden;display:none">Z=
jQcmQRYFpfptBannerStart</div>=0A<u></u>=0A  <div dir=3D"ltr" lang=3D"en" i=
d=3D"m_1055502942438550695pfptBannerasvcyt0" style=3D"display:block;text-a=
lign:left;margin:0px 0px 10px;padding:7px 16px 8px;border-radius:4px;min-w=
idth:200px;background-color:rgb(250,223,155);border-top:4px solid rgb(242,=
176,4)">=0A    <div id=3D"m_1055502942438550695pfptBannerasvcyt0" style=3D=
"float:left;display:block;margin:1px 0px;max-width:600px">=0A      <div id=
=3D"m_1055502942438550695pfptBannerasvcyt0" style=3D"display:block;backgro=
und-color:rgb(250,223,155);color:rgb(0,0,0);font-family:Arial,sans-serif;f=
ont-weight:bold;font-size:14px;line-height:1.29">=0A	This Message Is From =
an Untrusted Sender=0A      </div>=0A      <div id=3D"m_105550294243855069=
5pfptBannerasvcyt0" style=3D"font-weight:normal;display:block;background-c=
olor:rgb(250,223,155);color:rgb(0,0,0);font-family:Arial,sans-serif;font-s=
ize:12px;line-height:1.5;margin-top:2px">=0AYou have not previously corres=
ponded with this sender.=0A      </div>=0A    </div>=0A    <div style=3D"h=
eight:0px;clear:both;display:block;line-height:0;font-size:0.01px">&nbsp;<=
/div>=0A  </div>=0A<u></u>=0A<div style=3D"font-size:1px;color:rgb(255,255=
,255);line-height:1px;max-height:0px;opacity:0;overflow:hidden;display:non=
e">ZjQcmQRYFpfptBannerEnd</div>=0A<div dir=3D"ltr"><div dir=3D"ltr"><div d=
ir=3D"ltr">Hi,<div><br></div><div>You could also use this query, if the ra=
tio is low, that means there is no pressure on wal size and you can keep t=
he max_wal_size value as it is.</div><div><br><div><font face=3D"monospace=
">SELECT</font></div><div><font face=3D"monospace">&nbsp; num_timed,</font=
></div><div><font face=3D"monospace">&nbsp; num_requested,</font></div><di=
v><font face=3D"monospace">&nbsp; round((num_requested::numeric / NULLIF(n=
um_timed + num_requested, 0)) * 100, 2)</font></div><div><font face=3D"mon=
ospace">&nbsp; &nbsp; AS requested_pct</font></div><div><font face=3D"mono=
space">FROM pg_stat_checkpointer;</font></div><div><font face=3D"monospace=
">+-----------+---------------+---------------+</font></div><div><font fac=
e=3D"monospace">| num_timed | num_requested | requested_pct |</font></div>=
<div><font face=3D"monospace">+-----------+---------------+---------------=
+</font></div><div><font face=3D"monospace">|&nbsp; &nbsp; &nbsp; 3502 |&n=
bsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;146 |&nbsp; &nbsp; &nbsp; &nbsp; &n=
bsp; 4.00 |</font></div><div><font face=3D"monospace">+-----------+-------=
--------+---------------+</font></div><div><font face=3D"monospace">(1 row=
)</font></div></div><div><font face=3D"monospace"><br></font></div><div><f=
ont face=3D"monospace">Regards,</font></div><div><font face=3D"monospace">=
<br></font></div><div><font face=3D"monospace">Fabrice</font></div><div><b=
r></div></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Tue, Nov 11, 2025 at 12:28=E2=80=AFAM Sam Stearns &lt;<=
a href=3D"mailto:sam.stearns@dat.com" target=3D"_blank">sam.stearns@dat.co=
m</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x"><div dir=3D"ltr"><div>Howdy,</div><div><br></div><div>Could someone adv=
ise on how to determine the correct settings for the following, please?:</=
div><div><br></div><div><ul style=3D"margin-top: 0px;"><li>checkpoint_time=
out</li><li>max_wal_size</li></ul></div><div><br></div><div>Thank you,</di=
v><div><br></div><div>Sam</div><div><br></div><span class=3D"gmail_signatu=
re_prefix">-- </span><br><div dir=3D"ltr" class=3D"gmail_signature"><div d=
ir=3D"ltr"><span><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:10pt;=
margin-bottom:10pt"><span style=3D"font-size:11pt;font-family:Inter,sans-s=
erif;color:rgb(51,51,51);background-color:transparent;font-weight:700;vert=
ical-align:baseline">Samuel Stearns</span><span style=3D"font-size:11pt;fo=
nt-family:Inter,sans-serif;color:rgb(51,51,51);background-color:transparen=
t;font-weight:700;vertical-align:baseline"><br></span><span style=3D"font-=
size:11pt;font-family:Inter,sans-serif;color:rgb(102,102,102);background-c=
olor:transparent;vertical-align:baseline">Team Lead - Database</span><span=
 style=3D"font-size:11pt;font-family:Inter,sans-serif;color:rgb(102,102,10=
2);background-color:transparent;vertical-align:baseline"><br></span><span =
style=3D"font-size:11pt;font-family:Inter,sans-serif;color:rgb(102,102,102=
);background-color:transparent;vertical-align:baseline">c: 971 762 6879 </=
span><span style=3D"font-size:11pt;font-family:Inter,sans-serif;color:rgb(=
147,149,152);background-color:transparent;vertical-align:baseline">|</span=
><span style=3D"font-size:11pt;font-family:Inter,sans-serif;color:rgb(102,=
102,102);background-color:transparent;vertical-align:baseline"> o: 971 762=
 6879 </span><span style=3D"font-size:11pt;font-family:Inter,sans-serif;co=
lor:rgb(147,149,152);background-color:transparent;vertical-align:baseline"=
>|</span><span style=3D"font-size:11pt;font-family:Inter,sans-serif;color:=
rgb(102,102,102);background-color:transparent;vertical-align:baseline"> DA=
T.com</span></p><p dir=3D"ltr" style=3D"line-height:1.38;margin-top:0pt;ma=
rgin-bottom:0pt"><a href=3D"https://www.dat.com/?utm_medium=3Demail&amp;ut=
m_source=3DDAT_email_signature_link" target=3D"_blank"><span style=3D"font=
-size:11pt;font-family:Arial,sans-serif;color:rgb(17,85,204);background-co=
lor:transparent;vertical-align:baseline"><span style=3D"border:none;displa=
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