Update of /home/cvsd/slony1/slony1-www/content
In directory main.slony.info:/tmp/cvs-serv22448

Modified Files:
	frontpage.txt 
Log Message:
Add discussion of "why is Slony still relevant?"


Index: frontpage.txt
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RCS file: /home/cvsd/slony1/slony1-www/content/frontpage.txt,v
retrieving revision 1.42
retrieving revision 1.43
diff -C 2 -d -r1.42 -r1.43
*** frontpage.txt	7 Oct 2010 16:57:59 -0000	1.42
--- frontpage.txt	26 Oct 2010 18:24:22 -0000	1.43
***************
*** 1,7 ****
  ---
  Slony-I 2.0.5 Released
- <p>
  
! 2.0.5 fixes more than 24 issues found from 2.0.4 and earlier versions, remedying many issues found during an extensive testing period.
  
  ---
--- 1,43 ----
  ---
+ Why use Slony-I when PostgreSQL 9.0 includes replication?
+ 
+ <P> PostgreSQL 9.0 includes streaming replication, which, for a number
+ of use cases, is likely to be simpler and more convenient than
+ Slony-I.
+ 
+ <P> There are, however, three characteristic kinds of cases where
+ you'll need something like Slony-I, where the built-in WAL-based
+ replication won't work:
+ 
+ <ul>
+ 
+ <li> You need to interact between PostgreSQL versions.  Slony (and
+    similar systems like Londiste and Bucardo) can cope with having
+    nodes running different versions of PostgreSQL.
+ 
+ <P> WAL-based replication requires that all databases use
+    <i>identical</i> versions of PostgreSQL, running on identical
+    architectures.
+ 
+ <li> You only want to replicate parts of the changes that are going on.
+ 
+ <P>  WAL-based replication duplicates <i>absolutely everything.</i>
+ 
+ <li> You need for there to be extra behaviours taking place on
+    subscribers, for instance, populating cache management information.
+ 
+ <p> WAL-based replication duplicates <i>absolutely everything,</i> and
+    nothing extra that changes data can run on a WAL-based replica.
+ 
+ </ul>
+ 
+ <P> Steve Singer also discusses the matter in <a href=
+ "http://scanningpages.wordpress.com/2010/10/09/9-0-streaming-replication-vs-slony/>
+ 9.0 Streaming Replication vs Slony </a>.
+ 
+ ---
  Slony-I 2.0.5 Released
  
! <P> 2.0.5 fixes more than 24 issues found from 2.0.4 and earlier versions, remedying many issues found during an extensive testing period.
  
  ---
***************
*** 27,32 ****
  ---
  Slony-I 2.0.4 Released
! <p>
! This release of the 2.0.x stream includes fixes to the issues introduced
  in 2.0.3.  2.0.3 installations are encourged to upgrade.  
  
--- 63,68 ----
  ---
  Slony-I 2.0.4 Released
! 
! <p>This release of the 2.0.x stream includes fixes to the issues introduced
  in 2.0.3.  2.0.3 installations are encourged to upgrade.