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Commit1aa4a37

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Add replication, encryption, and cross database FAQ items.
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‎doc/FAQ

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Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated:Wed Oct9 23:14:53 EDT 2002
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Last updated:Fri Oct11 00:59:31 EDT 2002
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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4.25) How do I return multiple rows or columns from a function?
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4.26) Why can't I reliably create/drop temporary tables in PL/PgSQL
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functions?
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4.27) What replication options are available?
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4.28) What encryption options are available?
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Extending PostgreSQL
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4.24) How do I perform queries using multiple databases?
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There is no way to queryany databaseexceptthe current one. Because
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PostgreSQL loads database-specific system catalogs, it is uncertain
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how a cross-database query should even behave.
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There is no way to querya databaseother thanthe current one.
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BecausePostgreSQL loads database-specific system catalogs, it is
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uncertainhow a cross-database query should even behave.
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Of course, a client can make simultaneous connections to different
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databases and merge the information that way.
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/contrib/dblink allows cross-database queries using function calls. Of
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course, a client can make simultaneous connections to different
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databases and merge the results on the client side.
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4.25) How do I return multiple rows or columns from a function?
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the old temporary table. The solution is to use EXECUTE for temporary
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table access in PL/PgSQL. This will cause the query to be reparsed
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every time.
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4.27) What replication options are available?
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There are several master/slave replication solutions available. These
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allow only the master to make database changes and the slave can only
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do database reads. The bottom of
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http://gborg.postgresql.org/genpage?replication_research lists them. A
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multi-master replication solution is being worked on at
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http://gborg.postgresql.org/project/pgreplication/projdisplay.php.
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4.27) What encryption options are available?
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* /contrib/pgcrypto contains many encryption functions for use in
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SQL queries.
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* The only way to encrypt transmission from the client to the server
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is by using hostssl in pg_hba.conf.
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* Database user passwords are automatically encrypted when stored in
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version 7.3. In previous versions, you must enable
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password_encryption in postgresql.conf.
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_________________________________________________________________
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Extending PostgreSQL

‎doc/src/FAQ/FAQ.html

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alink="#0000ff">
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<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
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<P>Last updated:Wed Oct 9 23:14:53 EDT 2002</P>
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<P>Last updated:Fri Oct11 00:59:31 EDT 2002</P>
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<P>Current maintainer: Bruce Momjian (<Ahref=
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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<Ahref="#4.26">4.26</A>) Why can't I reliably create/drop
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temporary tables in PL/PgSQL functions?<BR>
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<Ahref="#4.27">4.27</A>) What replication options are available?<BR>
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<Ahref="#4.28">4.28</A>) What encryption options are available?<BR>
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<H2align="center">Extending PostgreSQL</H2>
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<H4><Aname="4.27">4.27</A>) What replication options are available?
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</H4>
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<P>There are several master/slave replication solutions available.
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These allow only one server to make database changes and the slave
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merely allow database reading.
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These allow only the master to make database changes and the slave
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can only do database reads. The bottom of<a
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href="http://gborg.postgresql.org/genpage?replication_research">
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http://gborg.postgresql.org/genpage?replication_research</a> lists
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them. A multi-master replication solution is being worked on at<a
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href="http://gborg.postgresql.org/project/pgreplication/projdisplay.
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php">http://gborg.postgresql.org/project/pgreplication/projdisplay.php</a>.</P>
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<H4><Aname="4.27">4.27</A>) What encryption options are available?
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</H4>
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<UL>
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<LI><I>/contrib/pgcrypto</I> contains many encryption functions for
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use in<SMALL>SQL</SMALL> queries.</LI>
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<LI>The only way to encrypt transmission from the client to the
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server is by using<I>hostssl</I> in<I>pg_hba.conf</I>.</LI>
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<LI>Database user passwords are automatically encrypted when stored
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in version 7.3. In previous versions, you must enable
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<I>password_encryption</I> in<I>postgresql.conf</I>.</LI>
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</UL>
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<HR>
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