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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <HTML ><HEAD ><TITLE >BKI Backend Interface</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 9.2.24 Documentation" HREF="index.html"><LINK REL="UP" TITLE="Internals" HREF="internals.html"><LINK REL="PREVIOUS" TITLE="Database Page Layout" HREF="storage-page-layout.html"><LINK REL="NEXT" TITLE="BKI File Format" HREF="bki-format.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="2017-11-06T22:43:11"></HEAD ><BODY CLASS="CHAPTER" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="5" ALIGN="center" VALIGN="bottom" ><A HREF="index.html" >PostgreSQL 9.2.24 Documentation</A ></TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A TITLE="Database Page Layout" HREF="storage-page-layout.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="10%" ALIGN="left" VALIGN="top" ><A HREF="internals.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="60%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="20%" ALIGN="right" VALIGN="top" ><A TITLE="BKI File Format" HREF="bki-format.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="BKI" ></A >Chapter 57. <ACRONYM CLASS="ACRONYM" >BKI</ACRONYM > Backend Interface</H1 ><DIV CLASS="TOC" ><DL ><DT ><B >Table of Contents</B ></DT ><DT >57.1. <A HREF="bki-format.html" ><ACRONYM CLASS="ACRONYM" >BKI</ACRONYM > File Format</A ></DT ><DT >57.2. <A HREF="bki-commands.html" ><ACRONYM CLASS="ACRONYM" >BKI</ACRONYM > Commands</A ></DT ><DT >57.3. <A HREF="bki-structure.html" >Structure of the Bootstrap <ACRONYM CLASS="ACRONYM" >BKI</ACRONYM > File</A ></DT ><DT >57.4. <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 ></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="storage-page-layout.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="bki-format.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Database Page Layout</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="internals.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><ACRONYM CLASS="ACRONYM" >BKI</ACRONYM > File Format</TD ></TR ></TABLE ></DIV ></BODY ></HTML >