RE: Oracle recovery
- From: "Smith, Ron L." <rlsmith@xxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 3 May 2004 14:59:34 -0500
We do full exports on all databases at least once a day for table level
recovery if needed. We also do daily hot backups for point in time
recovery. I feel there is a need for both.
Ron Smith
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of Daniel Fink
Sent: Monday, May 03, 2004 2:42 PM
To: oracle-l@xxxxxxxxxxxxx
Subject: Re: Oracle recovery
I recall a paper from Oracle (about 5 years ago) that analyzed the
various outages, the methods of recovery and how long they took. I have
it at home and I'll see if I can get a doc_id from it.
The point I would make with the DBA is that exports are not a recovery
mechanism, they are only able to restore to a given point (time of the
export) and they do not restore everything (sys objects). With an
export, there is no way to roll-forward. Of course, a cold backup w/out
archive logs is also unable to roll-forward. All data from the last
export and the current time is lost period end of story. Is this
acceptable? Perhaps. In certain environments where data loss is not a
problem, exports are a pretty simple way of capturing a snapshot of the
data. It is also not just 'data' that is lost. It is anything stored
inside the db, including procedures, packages, etc. In a development
environment, a days worth of coding could easily run into the 10s of
1000s of dollars.
Daniel
"M.Godlewski" wrote:
>=20
> Believe it or not the database I'm currently using the DBA is forcing=20
> us to use exports as our applications recovery scenario. I'm trying=20
> to locate information about archive logging and the tablespace point=20
> in time recovery versus full database recovery. I wanted to find some
> kind of percentages about the number of databases that need full=20
> database recovery (ie applying all archive logs) and percentages of=20
> databases that only needed TSPIR.
>=20
> I thinking if I can get some type of failure rate it could help sway=20
> him into using archive log mode which would give us better recovery
options.
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