<HTML>
<HEAD>
<meta name="GENERATOR" content="Microsoft Internet Assistant for PowerPoint 97">
<TITLE>DBD::Multiplex</TITLE>
</HEAD>
<BODY >
<H1>DBD::Multiplex</H1>
<P><UL>
<LI><H2>DBD::Multiplex
</H2>
<UL>
<LI>Connects to multiple databases (DBI DSN's) at once and returns a single $dbh
<LI>By default, executes any method call on that $dbh on each underlying $dbh in turn
</UL></UL><UL>
<LI><H2>Can be configured to
</H2>
<UL>
<LI>modify (insert, update,
) only master db, select from one replica at random
<LI>modify all databases but select from one ("poor man's replication")
<LI>fallback to alternate database if primary is unavailable
<LI>pick database for select at random to distribute load
<LI>concatenate select results from multiple databases (effectively a 'union' select)
<LI>return row counts/errors from non-select statements as select results
<UL>
<LI>one row for each underlying database
</UL><LI>May also acquire fancy caching, retry, and other smart logic in the future
</UL></UL><UL>
<LI><H2>Watch this space: <A HREF="http://search.cpan.org/search?dist=DBD-Multiplex">http://search.cpan.org/search?dist=DBD-Multiplex</A><A HREF="ftp://not.tdlc.com/pub/Multiplex.pm">
</A></H2>
<UL>
<LI>developed by Thomas Kishel and Tim Bunce
<LI>currently undergoing a significant redevelopment</UL></UL></P>
<P></P>
<P>
<TABLE>
<TD HEIGHT=100 WIDTH=100> <A HREF="tsld094.htm">Previous slide</A> </TD>
<TD HEIGHT=100 WIDTH=100> <A HREF="tsld096.htm">Next slide</A> </TD>
<TD HEIGHT=100 WIDTH=150> <A HREF="tsld001.htm">Back to first slide</A> </TD>
<TD HEIGHT=100 WIDTH=150> <A HREF="sld095.htm">View graphic version</A> </TD>
</TABLE>
<BR>
</P>
</Body>
</HTML>