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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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>Chapter 59. <ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
> Backend Interface</H1
><DIV
CLASS="TOC"
><DL
><DT
><B
>Table of Contents</B
></DT
><DT
>59.1. <A
HREF="bki-format.html"
><ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
> File Format</A
></DT
><DT
>59.2. <A
HREF="bki-commands.html"
><ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
> Commands</A
></DT
><DT
>59.3. <A
HREF="bki-structure.html"
>Structure of the Bootstrap <ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
> File</A
></DT
><DT
>59.4. <A
HREF="bki-example.html"
>Example</A
></DT
></DL
></DIV
><P
> Backend Interface (<ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
>) files are scripts in a
special language that is understood by the
<SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> backend when running in the
<SPAN
CLASS="QUOTE"
>"bootstrap"</SPAN
> mode. The bootstrap mode allows system catalogs
to be created and filled from scratch, whereas ordinary SQL commands
require the catalogs to exist already.
<ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
> files can therefore be used to create the
database system in the first place. (And they are probably not
useful for anything else.)
</P
><P
> <SPAN
CLASS="APPLICATION"
>initdb</SPAN
> uses a <ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
> file
to do part of its job when creating a new database cluster. The
input file used by <SPAN
CLASS="APPLICATION"
>initdb</SPAN
> is created as
part of building and installing <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
>
by a program named <TT
CLASS="FILENAME"
>genbki.pl</TT
>, which reads some
specially formatted C header files in the <TT
CLASS="FILENAME"
>src/include/catalog/</TT
>
directory of the source tree. The created <ACRONYM
CLASS="ACRONYM"
>BKI</ACRONYM
> file
is called <TT
CLASS="FILENAME"
>postgres.bki</TT
> and is
normally installed in the
<TT
CLASS="FILENAME"
>share</TT
> subdirectory of the installation tree.
</P
><P
> Related information can be found in the documentation for
<SPAN
CLASS="APPLICATION"
>initdb</SPAN
>.
</P
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