| From: | "Alexander Staubo" <alex(at)purefiction(dot)net> |
|---|---|
| To: | "Harpreet Dhaliwal" <harpreet(dot)dhaliwal01(at)gmail(dot)com> |
| Cc: | "Postgres General" <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: Vacuum DB in Postgres Vs similar concept in other RDBMS |
| Date: | 2007-05-23 17:59:08 |
| Message-ID: | 88daf38c0705231059t6d6cddbcnbc563ceb294fd722@mail.gmail.com |
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| Lists: | pgsql-general |
On 5/23/07, Harpreet Dhaliwal <harpreet(dot)dhaliwal01(at)gmail(dot)com> wrote:
> I was wondering if Vacuum DB concept in Postgres is really novel and there's
> no concept like this in other RDBMS like oracle or sql server.
> If at all other RDBMS have such a concept implemented, how good or bad it is
> as compared to postgres's vacuum db concept.
As we told you the last time you asked
(http://archives.postgresql.org/pgsql-general/2007-05/msg00074.php),
the concept of vacuuming is not unique to PostgreSQL by far. It is an
inherent facet of MVCC.
Other databases that implement MVCC, or implement an MVCC-like system
that requires garbage collection, include Oracle, SQLite, Firebird and
its parent project InterBase. Wikipedia has a decent article on MVCC:
http://en.wikipedia.org/wiki/Multiversion_concurrency_control
Alexander.
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