| From: | John R Pierce <pierce(at)hogranch(dot)com> |
|---|---|
| To: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: PG on two nodes with shared disk ocfs2 & drbd |
| Date: | 2011-02-28 00:34:42 |
| Message-ID: | 4D6AEDA2.6050202@hogranch.com |
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| Lists: | pgsql-general |
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.
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