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Re: PostgreSQL in the press again

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: pgsql-advocacy(at)postgresql(dot)org
Cc: Christopher Browne <cbbrowne(at)acm(dot)org>
Subject: Re: PostgreSQL in the press again
Date: 2004-11-09 18:17:33
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Lists: pgsql-advocacy

> > What are the other solutions?
> Mammoth Replicator, and whatever is happening with eRServer these
> days...

dbMirror is still quite popular.   This is partly because it is better suited 
for "very slow replication", e.g. replication via FTP server once per day, a 
la MusicBrainz.   

Both pgPool and C-JDBC offer synchronous query distribution based MM 
replication, although at the present time neither is transaction-safe.  When 
we get XA, C-JDBC will become a very viable alternative.

The issue talking with the press is that you need to communicate to them that 
"Replication" is a general programming topic, and NOT a single task, just 
like "database" is.    Nobody in the industry would expect to use the same 
database for all purposes; neither would anyone expect to use the same 
replication tool for all purposes.   The reason you get this question all the 
time is:
1) Many DBMSs (SQL Server, MySQL) support only one replication tool;
2) reporters have no clear idea what "replication" is.

Personally, I'd answer:

"Slony-I is undoubtedly our most popular replication tool.   It supports 
Master-Slave High Availability Replication.   However, there are a number of 
other solutions, such as dbMirror, eRServer, pgPool, C-JDBC, and the 
proprietary Mammoth Replicator, all of which are in wide use because they 
solve different replication problems than Slony-I does.  Replication is not a 
single solution for a single problem; it is several solutions for a wide 
array of different problems.  That's why no one replication tool will ever be 
the "default" replication for PostgreSQL."


Josh Berkus
Aglio Database Solutions
San Francisco

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