IMHO, that (2007) postgresql-'gotchas' webpage is not very useful anymore: almost all of these so-called 'gotchas' were relevant only to pretty old versions of Pg.
Here is a list of release dates:
pg version 7.4: 2003
pg version 8.0: 2005
pg version 8.1: 2005
pg version 8.2: 2006
pg version 8.3: 2008
pg version 8.4: 2009
Running a version older than 8.3 is rarely necessary.
Re: comparison PostgreSQL - Oracle: important things that are missing or not good enough in current (=8.4) postgresql:
- Replication: there are (good) replication solutions, but all are outside projects. Version 9.0, scheduled for later this year, will contain native replication.
- In-place upgrades: Upgrades need a dump and restore - and not all databases can afford that downtime. (Version 9.0 will probably have an in-place upgrade facility.)
- Partitioning: possible, but limited to a few hundred partitions.
Then again, compared to Oracle, PostgreSQL is much more immune to over-deployment ;-)
PostgreSQL now has native replication (both asynchronous and synchronous (it cannot do synchronous multimaster).
In-place upgrade is also now provided.
Partitioning remains a somewhat weak point. (although it works well enough for many common scenarios)
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