Add replication FAQ item.

doc/FAQ

 
                 Frequently Asked Questions (FAQ) for PostgreSQL
                                        
-   Last updated: Sun Apr 24 07:27:43 EDT 2005
+   Last updated: Sun Apr 24 07:48:48 EDT 2005
    
    Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
    
@@ -78,6 +78,7 @@
    4.19) Why do I get "relation with OID ##### does not exist" errors
    when accessing temporary tables in PL/PgSQL functions?
    4.20) What encryption options are available?
+   4.21) What replication solutions are available?
      _________________________________________________________________
    
                              General Questions
@@ -755,3 +756,15 @@
      * Database user passwords are automatically encrypted when stored in
        the system tables.
      * The server can also run using an encrypted file system.
+       
+  4.21) What replication solutions are available?
+  
+   Though "replication" is a single term, there are two major replication
+   technologies. Multi-master replication allows read/write queries to be
+   sent to multiple replicated computers. This capability has a serious
+   performance impact. Pgcluster is the most popular such solution
+   available for PostgreSQL. Master-slave replication allows a single
+   master to receive read/write queries, with slaves able to accept only
+   read/SELECT queries. The most popular master-slave PostgreSQL
+   replication solution is Slony. There are also commercial and
+   hardware-based replication solutions available.

doc/src/FAQ/FAQ.html

@@ -10,7 +10,7 @@
   alink="#0000ff">
     <H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
 
-    <P>Last updated: Sun Apr 24 07:27:43 EDT 2005</P>
+    <P>Last updated: Sun Apr 24 07:48:48 EDT 2005</P>
 
     <P>Current maintainer: Bruce Momjian (<A href=
     "mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)
@@ -115,6 +115,7 @@
     does not exist" errors when accessing temporary tables in PL/PgSQL
     functions?<BR>
      <A href="#4.20">4.20</A>) What encryption options are available?<BR>
+     <A href="#4.21">4.21</A>) What replication solutions are available?<BR>
      
 
     <HR>
@@ -984,5 +985,18 @@ length</TD></TR>
     <LI>The server can also run using an encrypted file system.</LI>
     </UL>
 
+    <H3><A name="4.21">4.21</A>) What replication solutions are available?
+    </H3>
+    <P>Though "replication" is a single term, there are two major replication
+    technologies.  Multi-master replication allows read/write queries to be
+    sent to multiple replicated computers.  This capability has a
+    serious performance impact.  <A href="http://pgfoundry.org/projects/pgcluster/">
+    Pgcluster</A> is the most popular such solution available for PostgreSQL. 
+    Master-slave replication allows a single master to receive read/write
+    queries, with slaves able to accept only read/<SMALL>SELECT</SMALL> queries.
+    The most popular master-slave PostgreSQL replication solution is
+    <A href="http://gborg.postgresql.org/project/slony1/projdisplay.php">
+    Slony</A>.  There are also commercial and hardware-based replication
+    solutions available.</P>
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