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Add replication, encryption, and cross database FAQ items.

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Bruce Momjian 2002-10-11 05:02:24 +00:00
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doc/FAQ
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Frequently Asked Questions (FAQ) for PostgreSQL
Last updated: Wed Oct 9 23:14:53 EDT 2002
Last updated: Fri Oct 11 00:59:31 EDT 2002
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
@ -96,6 +96,8 @@
4.25) How do I return multiple rows or columns from a function?
4.26) Why can't I reliably create/drop temporary tables in PL/PgSQL
functions?
4.27) What replication options are available?
4.28) What encryption options are available?
Extending PostgreSQL
@ -1046,12 +1048,13 @@ SELECT *
4.24) How do I perform queries using multiple databases?
There is no way to query any database except the current one. Because
PostgreSQL loads database-specific system catalogs, it is uncertain
how a cross-database query should even behave.
There is no way to query a database other than the current one.
Because PostgreSQL loads database-specific system catalogs, it is
uncertain how a cross-database query should even behave.
Of course, a client can make simultaneous connections to different
databases and merge the information that way.
/contrib/dblink allows cross-database queries using function calls. Of
course, a client can make simultaneous connections to different
databases and merge the results on the client side.
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
table access in PL/PgSQL. This will cause the query to be reparsed
every time.
4.27) What replication options are available?
There are several master/slave replication solutions available. These
allow only the master to make database changes and the slave can only
do database reads. The bottom of
http://gborg.postgresql.org/genpage?replication_research lists them. A
multi-master replication solution is being worked on at
http://gborg.postgresql.org/project/pgreplication/projdisplay.php.
4.27) What encryption options are available?
* /contrib/pgcrypto contains many encryption functions for use in
SQL queries.
* The only way to encrypt transmission from the client to the server
is by using hostssl in pg_hba.conf.
* Database user passwords are automatically encrypted when stored in
version 7.3. In previous versions, you must enable
password_encryption in postgresql.conf.
_________________________________________________________________
Extending PostgreSQL

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doc/src/FAQ/FAQ.html
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alink="#0000ff">
<H1>Frequently Asked Questions (FAQ) for PostgreSQL</H1>
<P>Last updated: Wed Oct 9 23:14:53 EDT 2002</P>
<P>Last updated: Fri Oct 11 00:59:31 EDT 2002</P>
<P>Current maintainer: Bruce Momjian (<A href=
"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
@ -144,6 +144,7 @@
<A href="#4.26">4.26</A>) Why can't I reliably create/drop
temporary tables in PL/PgSQL functions?<BR>
<A href="#4.27">4.27</A>) What replication options are available?<BR>
<A href="#4.28">4.28</A>) What encryption options are available?<BR>
<H2 align="center">Extending PostgreSQL</H2>
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<H4><A name="4.27">4.27</A>) What replication options are available?
</H4>
<P>There are several master/slave replication solutions available.
These allow only one server to make database changes and the slave
merely allow database reading.
These allow only the master to make database changes and the slave
can only do database reads. The bottom of <a
href="http://gborg.postgresql.org/genpage?replication_research">
http://gborg.postgresql.org/genpage?replication_research</a> lists
them. A multi-master replication solution is being worked on at <a
href="http://gborg.postgresql.org/project/pgreplication/projdisplay.
php">http://gborg.postgresql.org/project/pgreplication/projdisplay.php</a>.</P>
<H4><A name="4.27">4.27</A>) What encryption options are available?
</H4>
<UL>
<LI><I>/contrib/pgcrypto</I> contains many encryption functions for
use in <SMALL>SQL</SMALL> queries.</LI>
<LI>The only way to encrypt transmission from the client to the
server is by using <I>hostssl</I> in <I>pg_hba.conf</I>.</LI>
<LI>Database user passwords are automatically encrypted when stored
in version 7.3. In previous versions, you must enable
<I>password_encryption</I> in <I>postgresql.conf</I>.</LI>
</UL>
<HR>