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% Document Info
\author{armk}
\pdfinfo{
  /Title (postgresql-settings-config-quick-reference.pdf)
  /Creator (Cheatography)
  /Author (armk)
  /Subject (Postgresql settings/config quick reference Cheat Sheet)
}

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\noindent
\begin{multicols}{3}
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    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
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\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Postgresql settings/config quick reference Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{armk} via \textcolor{DarkBackground}{\uline{cheatography.com/215747/cs/47043/}}}
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\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}armk \\
  \uline{cheatography.com/armk} \\
  \end{tabulary}
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  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 19th September, 2025.\\
   Updated 19th September, 2025.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
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\begin{document}
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\begin{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{The config file(s)}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{Main config file is {\bf{postgresql.conf}} in instance directory (or specified explicitly as startup argument). \newline % Row Count 3 (+ 3)
Settings changes (incl. ALTER SYSTEM) are often not applied immediately: see the context property for how/when setting changes are applied. \newline % Row Count 6 (+ 3)
Official doc: \{\{link="https://www.postgresql.org/docs/current/config-setting.html"\}\}19.1. Setting Parameters\{\{/link\}\} / \{\{link="https://www.postgresql.org/docs/current/view-pg-settings.html\#VIEW-PG-SETTINGS"\}\}52.24. pg\_settings\{\{/link\}\}% Row Count 11 (+ 5)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2.8 cm} x{5.2 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Connection/network}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{listen\_addresses} & interfaces to listen on (ipv4 and v6) \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
port & TCP port \tn 
% Row Count 3 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{max\_connections} & Max simultaneous sessions \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
ssl & Enable encrypted transport \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.92 cm} x{4.08 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Logging}}  \tn
% Row 0
\SetRowColor{LightBackground}
log\_destination & Log format \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
log\_filename & Log filename pattern \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
log\_min\_messages & Minimum event severity to be logged \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{log\_min\_duration\_statement} & Log all statements with exec time \textgreater{} value \tn 
% Row Count 7 (+ 3)
% Row 4
\SetRowColor{LightBackground}
log\_checkpoint & Log checkpoints \tn 
% Row Count 8 (+ 1)
% Row 5
\SetRowColor{white}
log\_line\_prefix & Prefix for all log lines \tn 
% Row Count 10 (+ 2)
% Row 6
\SetRowColor{LightBackground}
log\_lock\_waits & Log lock waits longer than value \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
log\_statement & Log SQL statements (DML only, DDL only, ...) \tn 
% Row Count 15 (+ 3)
% Row 8
\SetRowColor{LightBackground}
log\_temp\_files & Log temp files larger than value \tn 
% Row Count 17 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{See \{\{link="https://www.postgresql.org/docs/current/runtime-config-logging.html\#RUNTIME-CONFIG-LOGGING"\}\}19.8. Error Reporting and Logging\{\{/link\}\} for filename format and templates}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{WAL/checkpoints}}  \tn
% Row 0
\SetRowColor{LightBackground}
wal\_level & Transaction log level: minimal (no log), replica, logical \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
fsync & Force flushing OS disk cache to physical storage \tn 
% Row Count 6 (+ 3)
% Row 2
\SetRowColor{LightBackground}
wal\_sync\_method & Method used for forcing WAL updates out to disk when fsync is on \tn 
% Row Count 10 (+ 4)
% Row 3
\SetRowColor{white}
synchronous\_commit & Wait for writes to be committed to disk before sending commit to client \tn 
% Row Count 14 (+ 4)
% Row 4
\SetRowColor{LightBackground}
full\_page\_writes & Do not write partial pages to WAL \tn 
% Row Count 16 (+ 2)
% Row 5
\SetRowColor{white}
wal\_buffers & Size of WAL buffers in RAM \tn 
% Row Count 18 (+ 2)
% Row 6
\SetRowColor{LightBackground}
checkpoint\_timeout & Max delay between checkpoints \tn 
% Row Count 20 (+ 2)
% Row 7
\SetRowColor{white}
\seqsplit{checkpoint\_completion\_target} & Spread checkpoint over n times checkpoint\_timeout \tn 
% Row Count 23 (+ 3)
% Row 8
\SetRowColor{LightBackground}
min/max\_wal\_size & Soft limits (targets) for WAL size \tn 
% Row Count 25 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.36 cm} x{4.64 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Replication}}  \tn
% Row 0
\SetRowColor{LightBackground}
archive\_mode & Enable WAL archiving \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\seqsplit{archive\_command} & Command used to archive WAL files \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{max\_wal\_senders} & Max concurrent replication threads \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
wal\_keep\_size & Size of preserved WAL segments {\bf{on the primary}} \tn 
% Row Count 8 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{max\_replication\_slots} & Number of replication slots (max concurrent standby connections) \tn 
% Row Count 11 (+ 3)
% Row 5
\SetRowColor{white}
hot\_standby & When in standby (in recovery), accept connections \tn 
% Row Count 14 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{hot\_standby\_feedback} & When in standby, give status feedback to primary \tn 
% Row Count 17 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{See \{\{link="https://www.postgresql.org/docs/current/runtime-config-wal.html\#RUNTIME-CONFIG-WAL-SETTINGS"\}\}19.5.1. Write Ahead Log settings\{\{/link\}\}, \{\{link="https://www.postgresql.org/docs/current/continuous-archiving.html\#BACKUP-ARCHIVING-WAL"\}\}25.3.1. Setting Up WAL Archiving\{\{/link\}\} and \{\{link="https://www.postgresql.org/docs/current/runtime-config-replication.html\#RUNTIME-CONFIG-REPLICATION"\}\}19.6. Replication\{\{/link\}\}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
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\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.28 cm} x{4.72 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Resources}}  \tn
% Row 0
\SetRowColor{LightBackground}
shared\_buffers & Instance-wide shared memory (see oracle sga) \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
temp\_buffers & Dedicated memory per session (see oracle pga) \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
work\_mem & Dedicated memory per query \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{maintenance\_work\_mem} & Memory reserved for maintenance ops (vacuum, index creation, etc) \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{autovacuum\_work\_mem} & Memory dedicated to autovacuum processes \tn 
% Row Count 11 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Autovacuum controls}}  \tn
% Row 0
\SetRowColor{LightBackground}
autovacuum & Enable/disable autovacuum \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{autovacuum\_max\_workers} & Max parallel autovac jobs \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
autovacuum\_naptime & Max delay before autovac \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{autovacuum\_vacuum\_cost\_limit} & Accumulated I/O cost of autovac before pausing \tn 
% Row Count 9 (+ 3)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{autovacuum\_vacuum\_cost\_delay} & Duration of autovacuum pause (see previous) \tn 
% Row Count 12 (+ 3)
% Row 5
\SetRowColor{white}
\seqsplit{autovacuum\_vacuum\_threshold} & Insert/update threshold to trigger autovac (absolute) \tn 
% Row Count 15 (+ 3)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{autovacuum\_vacuum\_scale\_factor} & Insert/update threshold to trigger autovac (relative) \tn 
% Row Count 18 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{See \{\{link="https://www.postgresql.org/docs/current/runtime-config-autovacuum.html\#RUNTIME-CONFIG-AUTOVACUUM"\}\}19.10. Automatic Vacuuming\{\{/link\}\} \newline Autovacuum keeps count of I/O (as "cost"). Once cost has reached \seqsplit{autovacuum\_vacuum\_cost\_limit}, it pauses for \seqsplit{autovacuum\_vacuum\_cost\_delay}. \newline Vacuum threshold is the sum of vacuum\_threshold and vacuum\_scale\_factor. \newline Autovacuum trigger thresholds have separate, identical parameters for inserts.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.76 cm} x{4.24 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{Planner/optimizer}}  \tn
% Row 0
\SetRowColor{LightBackground}
seq\_page\_cost & Sequential page read cost \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{random\_page\_cost} & Random page read cost \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\seqsplit{cpu\_operator\_cost} & Operator call cost \tn 
% Row Count 6 (+ 2)
% Row 3
\SetRowColor{white}
\seqsplit{effective\_cache\_size} & Estimated system cache size \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\seqsplit{default\_statistics\_target} & "Target quality" of the optimizer: higher values takes longer to calculate plan but yields better results \tn 
% Row Count 14 (+ 6)
% Row 5
\SetRowColor{white}
\seqsplit{from\_collapse\_limit} & Merge nested FROM (to avoid "reorder experimentation" from the planner) if sub-FROM would yield less than this setting \tn 
% Row Count 21 (+ 7)
% Row 6
\SetRowColor{LightBackground}
\seqsplit{join\_collapse\_limit} & See \seqsplit{from\_collapse\_limit} but with JOINs instead of FROMs \tn 
% Row Count 24 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{See \{\{link="https://www.postgresql.org/docs/current/runtime-config-query.html\#RUNTIME-CONFIG-QUERY"\}\}19.7. Query Planning\{\{/link\}\}}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}