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% Document Info
\author{aaronmyatt}
\pdfinfo{
  /Title (postgresql-configuration.pdf)
  /Creator (Cheatography)
  /Author (aaronmyatt)
  /Subject (PostgreSQL Configuration Cheat Sheet)
}

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\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
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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 Configuration Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{aaronmyatt} via \textcolor{DarkBackground}{\uline{cheatography.com/30256/cs/9021/}}}
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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}aaronmyatt \\
  \uline{cheatography.com/aaronmyatt} \\
  \end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 6th September, 2016.\\
   Updated 6th September, 2016.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
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  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
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  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
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\begin{multicols*}{3}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{PostgreSQL Server Config}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Merely a convenient reproduction of the advise given by \{\{link="http://thebuild.com"\}\}Christophe Pettus\{\{/link\}\} during his excellent PyCon PostgreSQL workshop: \{\{link="https://www.youtube.com/watch?v=knUitQQnpJo"\}\} Check out the video! \{\{/link\}\}.% Row Count 5 (+ 5)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{x{2.88666 cm} x{2.09034 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{5.377cm}}{\bf\textcolor{white}{Config Files}}  \tn
% Row 0
\SetRowColor{LightBackground}
postgresql.conf & pg\_hba.conf \tn 
% Row Count 1 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{5.377cm}}{Aside from log files, these are the ONLY files you should edit in the main postgreSQL directory.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{LOGGING (postgresql.conf)}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{log\_destination = 'csvlog' \newline log\_directory = 'pg\_log' \newline logging\_collector = on \newline log\_filename = \seqsplit{'postgres-\%Y-\%m-\%d\_\%H\%M\%S'} \newline log\_rotation\_age = 1d \newline log\_rotation\_size = 1GB \newline log\_min\_duration\_statement = 250ms \newline log\_checkpoints = on \newline log\_connections = on \newline log\_disconnections = on \newline log\_lock\_waits = on \newline log\_temp\_files = 0} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Be generous with logging; it has very low impact on the system. \newline NOTE: "Standard format" or "stderr" is obsolete. There is no good reason to use it anymore.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Changing Settings}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Most settings just require a server reload to take effect.} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Some require a full server restart (such as `shared\_buffers`).} \tn 
% Row Count 4 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{pg\_hba.conf}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{local    all              postgres                            peer \newline local    replication  repl                                   trust \newline local    fugu           fugu                                  trust \newline host     all              all          127.0.0.1/32        md5 \newline host     all              all          ::1/128                 md5 \newline hostssl fugu          fugu       178.79.191.8/32  md5 \newline hostssl replication repl        178.79.191.8/32  md5} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Example file}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
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\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{User Settings}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{By default, database traffic is not encrypted.} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Turn on ssl if you are running in a cloud provider.} \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{For pre-9.4, set \seqsplit{ssl\_renegotiation\_limit} = 0.} \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Memory Config}}  \tn
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\mymulticolumn{1}{x{5.377cm}}{Consists of:} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{`shared\_buffers`} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{`work\_mem`} \tn 
% Row Count 3 (+ 1)
% Row 3
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\mymulticolumn{1}{x{5.377cm}}{`maintenance\_work\_mem`} \tn 
% Row Count 4 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{SHARED BUFFERS (postgresql.conf)}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Below 2gb RAM?} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}20\% Total System Memory} \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Below 64gm RAM?} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}25\% Total System Memory} \tn 
% Row Count 4 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{\textgreater{} 64gm RAM?} \tn 
\mymulticolumn{1}{x{5.377cm}}{\hspace*{6 px}\rule{2px}{6px}\hspace*{6 px}`shared\_buffers = 16gb`} \tn 
% Row Count 6 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{WORK MEM (postgresql.conf)}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Start low: 32-64MB.} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Look for 'temporary file' lines in logs.} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{THEN - Set to 2-3x the largest temp file you see.} \tn 
% Row Count 3 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{Can cause a huge speed-up if set properly. But be careful: It can use that amount of memory per planner node.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{MAINTENANCE WORK MEM}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{10\% of system memory, up to 1GB.% Row Count 1 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{DO NOT TOUCH}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{The contents and special files in the main PostgreSQL directories should never, ever be modified directly. Ever.} \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Exceptions: pg\_log (if you put the log files there), and the configuration files.} \tn 
% Row Count 5 (+ 2)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{pg\_xlog and pg\_clog are off-limits!} \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{Checkpoint Config}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Essentially, don't let `checkpoint\_segments` get out of hand.% Row Count 2 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{9.4 and earlier (postgresql.conf)}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{wal\_buffers = 16MB \newline checkpoint\_completion\_target = 0.9 \newline checkpoint\_timeout = 10m-30m \# Depends on restart time \newline checkpoint\_segments = 32 \# To start.} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{checkpoint\_segments happening more often than checkpoint\_timeout? \newline  \newline Adjust checkpoint\_segments so that checkpoints happen due to timeouts rather filling segments.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{9.5 and later (postgresql.conf)}}  \tn
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{wal\_buffers = 16MB \newline checkpoint\_completion\_target = 0.9 \newline checkpoint\_timeout = 10m-30m \# Depends on restart time \newline min\_wal\_size = 512MB \newline max\_wal\_size = 2GB} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\SetRowColor{LightBackground}
\mymulticolumn{1}{x{5.377cm}}{checkpoint\_segments happening more often than checkpoint\_timeout? \newline  \newline Step 1: Adjust min\_wal\_size so that checkpoints happen due to timeouts rather filling segments. \newline Step 2: Adjust max\_wal\_size to be about three times min\_wal\_size.}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{effective\_cache\_size}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{Set to the amount of file system cache available. \newline % Row Count 1 (+ 1)
Otherwise: \newline % Row Count 2 (+ 1)
If you don't know, set it to 75\% of total system memory.% Row Count 4 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{5.377cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{5.377cm}}{\bf\textcolor{white}{REFERENCE}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{5.377cm}}{\seqsplit{http://thebuild.com/presentations/pycon-2016-pppp.pdf}% Row Count 2 (+ 2)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}


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

\end{document}