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help / color / mirror / Atom feedFrom: Jeff Frost <[email protected]>
To: Bruce Momjian <[email protected]>
Cc: Chris Browne <[email protected]>
Cc: [email protected]
Subject: Re: [HACKERS] Replication documentation addition
Date: Tue, 14 Nov 2006 14:02:21 -0800 (PST)
Message-ID: <Pine.LNX.4.64.0611141401000.23695@discord.home.frostconsultingllc.com> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>
On Tue, 14 Nov 2006, Bruce Momjian wrote:
> Your description was too detailed, but I took some of your concepts:
>
> <para>
> In clustering, each server can accept write requests, and these
> write requests are broadcast from the original server to all
> other servers before each transaction commits. Heavy write
> activity can cause excessive locking, leading to poor performance.
> In fact, write performance is often worse than that of a single
> server. Read requests can be sent to any server. Clustering
> is best for mostly read workloads, though its big advantage is
> that any server can accept write requests --- there is no need
> to partition workloads between read/write and read-only servers.
> </para>
>
> <para>
> Clustering is implemented by <productname>Oracle</> in their
> <productname><acronym>RAC</></> product. <productname>PostgreSQL</>
> does not offer this type of load balancing, though
> <productname>PostgreSQL</> two-phase commit (<xref
> linkend="sql-prepare-transaction-title"> and <xref linkend=
> "sql-commit-prepared-title">) can be used to implement this in
> application code or middleware.
> </para>
Bruce,
Continuent's uni/cluster middleware product implements this type of
clustering/load balancing. Perhaps it warrants a mention? Not sure how far
we want to get into listing external products.
--
Jeff Frost, Owner <[email protected]>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 650-780-7908 FAX: 650-649-1954
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To: [email protected]
Cc: [email protected], [email protected], [email protected]
Subject: Re: [HACKERS] Replication documentation addition
In-Reply-To: <Pine.LNX.4.64.0611141401000.23695@discord.home.frostconsultingllc.com>
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