/usr/share/doc/slony1-2-doc/adminguide/limitations.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
<HTML
><HEAD
><TITLE
> Current Limitations</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.79"><LINK
REV="MADE"
HREF="mailto:slony1-general@lists.slony.info"><LINK
REL="HOME"
TITLE="Slony-I 2.0.7 Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="Preface"
HREF="preface.html"><LINK
REL="PREVIOUS"
TITLE="Slony-I Concepts"
HREF="concepts.html"><LINK
REL="NEXT"
TITLE="Tutorial"
HREF="tutorial.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="2011-12-03T11:44:27"></HEAD
><BODY
CLASS="SECT1"
><DIV
CLASS="NAVHEADER"
><TABLE
SUMMARY="Header navigation table"
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
><TR
><TH
COLSPAN="5"
ALIGN="center"
VALIGN="bottom"
><SPAN
CLASS="PRODUCTNAME"
>Slony-I</SPAN
> 2.0.7 Documentation</TH
></TR
><TR
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="concepts.html"
ACCESSKEY="P"
>Prev</A
></TD
><TD
WIDTH="10%"
ALIGN="left"
VALIGN="top"
><A
HREF="preface.html"
>Fast Backward</A
></TD
><TD
WIDTH="60%"
ALIGN="center"
VALIGN="bottom"
>Chapter 1. Preface</TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="top"
><A
HREF="preface.html"
>Fast Forward</A
></TD
><TD
WIDTH="10%"
ALIGN="right"
VALIGN="top"
><A
HREF="tutorial.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
></TABLE
><HR
ALIGN="LEFT"
WIDTH="100%"></DIV
><DIV
CLASS="SECT1"
><H1
CLASS="SECT1"
><A
NAME="LIMITATIONS"
>1.4. Current Limitations</A
></H1
><A
NAME="AEN342"
></A
><P
> <SPAN
CLASS="PRODUCTNAME"
>Slony-I</SPAN
> does not automatically replicate
<P
></P
></P><UL
><LI
><P
>Changes to large objects (BLOBS)</P
></LI
><LI
><P
>Changes made by DDL commands</P
></LI
><LI
><P
>Changes to users and roles</P
></LI
><LI
><P
>Changes made by the TRUNCATE command,
though this might change in a future version of <SPAN
CLASS="PRODUCTNAME"
>Slony-I</SPAN
></P
></LI
></UL
><P></P
><P
> The main reason for these limitations is that <SPAN
CLASS="PRODUCTNAME"
>Slony-I</SPAN
>
collects updates using triggers, and neither schema changes nor large
object operations are captured by triggers</P
><P
>There is a capability for <SPAN
CLASS="PRODUCTNAME"
>Slony-I</SPAN
> to propagate notably DDL changes
if you submit them as scripts via the <SPAN
CLASS="APPLICATION"
>slonik</SPAN
> <A
HREF="stmtddlscript.html"
>SLONIK EXECUTE SCRIPT</A
> operation.  That is not handled
<SPAN
CLASS="QUOTE"
>"automatically;"</SPAN
> you, as a database administrator, will
have to construct an SQL DDL script and submit it, via <A
HREF="stmtddlscript.html"
>SLONIK EXECUTE SCRIPT</A
>.</P
><P
>If you have these sorts of requirements, it may be worth
exploring the use of <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
> 8.X <ACRONYM
CLASS="ACRONYM"
>PITR</ACRONYM
> (Point In
Time Recovery), where <ACRONYM
CLASS="ACRONYM"
>WAL</ACRONYM
> logs are replicated to
remote</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="concepts.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="tutorial.html"
ACCESSKEY="N"
>Next</A
></TD
></TR
><TR
><TD
WIDTH="33%"
ALIGN="left"
VALIGN="top"
><SPAN
CLASS="PRODUCTNAME"
>Slony-I</SPAN
> Concepts</TD
><TD
WIDTH="34%"
ALIGN="center"
VALIGN="top"
><A
HREF="preface.html"
ACCESSKEY="U"
>Up</A
></TD
><TD
WIDTH="33%"
ALIGN="right"
VALIGN="top"
>Tutorial</TD
></TR
></TABLE
></DIV
></BODY
></HTML
>
slony1-2-doc 2.0.7-3build1 / usr / share / doc / slony1-2-doc / adminguide / limitations.html
