Re: PG on two nodes with shared disk ocfs2 & drbd

On 02/27/11 4:07 PM, Andrew Sullivan wrote:
> Multi-master transactional ACID-type databases with multiple masters is very hard.
>

indeed.

Oracle RAC works by having a distributed cache and locking manager
replicating over a fast bus like infininet.   oracle fundamentally uses
a transaction redo log rather than a write-ahead log like postgres, this
is somewhat more amendable to distributed processing when combined with
the distributed cache and lock.

The trade-off is, its a really complicated and fragile system, with a
high opportunity for catastrophic failure.  It seems to me like Oracle
wants to sell turnkey database servers with their Exadata stuff.