Re: Oracle recovery
- From: Daniel Fink <Daniel.Fink@xxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Mon, 03 May 2004 13:42:17 -0600
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:
>
> Believe it or not the database I'm currently using the DBA is forcing us to
> use exports as our applications recovery scenario. I'm trying to locate
> information about archive logging and the tablespace point in time recovery
> versus full database recovery. I wanted to find some kind of percentages
> about the number of databases that need full database recovery (ie applying
> all archive logs) and percentages of databases that only needed TSPIR.
>
> I thinking if I can get some type of failure rate it could help sway him into
> using archive log mode which would give us better recovery options.
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