Sophie: postgresql9.4-docs-9.4.15-1.mga6 noarch

postgresql9.4-docs-9.4.15-1.mga6.noarch.rpm

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
>pg_test_fsync</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REV="MADE"
HREF="mailto:pgsql-docs@postgresql.org"><LINK
REL="HOME"
TITLE="PostgreSQL 9.4.15 Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="Server Applications"
HREF="contrib-prog-server.html"><LINK
REL="PREVIOUS"
TITLE="pg_standby"
HREF="pgstandby.html"><LINK
REL="NEXT"
TITLE="pg_test_timing"
HREF="pgtesttiming.html"><LINK
REL="STYLESHEET"
TYPE="text/css"
HREF="stylesheet.css"><META
HTTP-EQUIV="Content-Type"
CONTENT="text/html; charset=ISO-8859-1"><META
NAME="creation"
CONTENT="2017-11-10T00:43:05"></HEAD
><BODY
CLASS="REFENTRY"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="4"
ALIGN="center"
VALIGN="bottom"
><A
HREF="index.html"
>PostgreSQL 9.4.15 Documentation</A
></TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
TITLE="pg_standby"
HREF="pgstandby.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="contrib-prog-server.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="60%"
ALIGN="center"
VALIGN="bottom"
></TD
><TD
WIDTH="20%"
ALIGN="right"
VALIGN="top"
><A
TITLE="pg_test_timing"
HREF="pgtesttiming.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><H1
><A
NAME="PGTESTFSYNC"
></A
><SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN171616"
></A
><H2
>Name</H2
>pg_test_fsync&nbsp;--&nbsp;determine fastest wal_sync_method for <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN171620"
></A
><H2
>Synopsis</H2
><P
><TT
CLASS="COMMAND"
>pg_test_fsync</TT
> [<TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
>...]</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN171625"
></A
><H2
>Description</H2
><P
>  <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> is intended to give you a reasonable
  idea of what the fastest <A
HREF="runtime-config-wal.html#GUC-WAL-SYNC-METHOD"
>wal_sync_method</A
> is on your
  specific system,
  as well as supplying diagnostic information in the event of an identified I/O
  problem.  However, differences shown by
  <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> might not make any significant
  difference in real database throughput, especially since many database servers
  are not speed-limited by their transaction logs.
  <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> reports average file sync operation
  time in microseconds for each <TT
CLASS="LITERAL"
>wal_sync_method</TT
>, which can also be used to
  inform efforts to optimize the value of <A
HREF="runtime-config-wal.html#GUC-COMMIT-DELAY"
>commit_delay</A
>.
 </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN171634"
></A
><H2
>Options</H2
><P
>    <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> accepts the following
    command-line options:

    <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="OPTION"
>-f</TT
><BR><TT
CLASS="OPTION"
>--filename</TT
></DT
><DD
><P
>        Specifies the file name to write test data in.
        This file should be in the same file system that the
        <TT
CLASS="FILENAME"
>pg_xlog</TT
> directory is or will be placed in.
        (<TT
CLASS="FILENAME"
>pg_xlog</TT
> contains the <ACRONYM
CLASS="ACRONYM"
>WAL</ACRONYM
> files.)
        The default is <TT
CLASS="FILENAME"
>pg_test_fsync.out</TT
> in the current
        directory.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-s</TT
><BR><TT
CLASS="OPTION"
>--secs-per-test</TT
></DT
><DD
><P
>        Specifies the number of seconds for each test.  The more time
        per test, the greater the test's accuracy, but the longer it takes
        to run.  The default is 5 seconds, which allows the program to
        complete in under 2 minutes.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-V</TT
><BR><TT
CLASS="OPTION"
>--version</TT
></DT
><DD
><P
>        Print the <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> version and exit.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-?</TT
><BR><TT
CLASS="OPTION"
>--help</TT
></DT
><DD
><P
>        Show help about <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> command line
        arguments, and exit.
       </P
></DD
></DL
></DIV
><P>
   </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN171673"
></A
><H2
>Author</H2
><P
>   Bruce Momjian <CODE
CLASS="EMAIL"
>&#60;<A
HREF="mailto:bruce@momjian.us"
>bruce@momjian.us</A
>&#62;</CODE
>
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN171677"
></A
><H2
>See Also</H2
><A
HREF="app-postgres.html"
><SPAN
CLASS="APPLICATION"
>postgres</SPAN
></A
></DIV
><DIV
CLASS="NAVFOOTER"
><HR
ALIGN="LEFT"
WIDTH="100%"><TABLE
SUMMARY="Footer navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><A
HREF="pgstandby.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="index.html"
ACCESSKEY="H"
>Home</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><A
HREF="pgtesttiming.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><SPAN
CLASS="APPLICATION"
>pg_standby</SPAN
></TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="contrib-prog-server.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
><SPAN
CLASS="APPLICATION"
>pg_test_timing</SPAN
></TD
></TR
></TABLE
></DIV
></BODY
></HTML
>