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From: Sami Imseih <samimseih@gmail.com>
Date: Fri, 20 Mar 2026 00:03:10 -0500
Message-ID: 
 <CAA5RZ0tPvWLVXhDMC3t3LhwTM-OnWHSvPo7tnZzOphR=HB4kgQ@mail.gmail.com>
Subject: Re: another autovacuum scheduling thread
To: David Rowley <dgrowleyml@gmail.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>, Greg Burd <greg@burd.me>,
	Robert Haas <robertmhaas@gmail.com>, Robert Treat <rob@xzilla.net>,
	Jeremy Schneider <schneider@ardentperf.com>,
 pgsql-hackers <pgsql-hackers@postgresql.org>
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>
> case, effective_xid_failsafe_age and effective_mxid_failsafe_age are
> signed ints and default to 1.6 billion. There's just not enough
> bit-space to divide them by any number much below 1.0 before they'll
> wrap.
>

Of course. It Would not be safe to divide by < 1.

Thanks!

--
Sami

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<div class=3D"gmail_quote gmail_quote_container" dir=3D"auto"><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left-width:1p=
x;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,20=
4)" dir=3D"auto">case, effective_xid_failsafe_age and effective_mxid_failsa=
fe_age are<br>
signed ints and default to 1.6 billion. There&#39;s just not enough<br>
bit-space to divide them by any number much below 1.0 before they&#39;ll<br=
>
wrap.<br></blockquote><blockquote class=3D"gmail_quote" style=3D"margin:0px=
 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1=
ex;border-left-color:rgb(204,204,204)" dir=3D"auto"></blockquote><div dir=
=3D"auto"><br></div><div dir=3D"auto">Of course. It Would not be safe to di=
vide by &lt; 1.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Thanks!=
=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto"><div style=3D"fon=
t-size:inherit" dir=3D"auto"><span style=3D"font-family:uictfonttextstylebo=
dy;font-size:inherit;font-style:normal;font-weight:400;letter-spacing:norma=
l;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;t=
ext-decoration:none;float:none;display:inline!important;color:rgb(0,0,0)">-=
-</span></div></div><div dir=3D"auto">Sami=C2=A0</div></div>

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