oracle-l メーリングリストでなるほどという投稿があったのでメモ。
Q: rmanカタログが複数ある場合、例えば本番サイトと災害対策サイトがあるような場合、どうやって同期すればいいか？
A: それぞれのrmanカタログで resync すればよい。
なるほどなるほど。それでよさそう。
よく考えると、基本的にrmanカタログって制御ファイルが持ってる情報をカタログデータベースにコピーしているのか。
（原文）
to my understanding, the rman catalog resync is based on your controlfile,
other catalog resync with the current controlfile for updated.run resync catalog, then your catalog will be resynced , try to make it as a
job run timely...Am i right ? please update me if i am wrong.
（中略）
> I am working on a backup standardization project (really interesting)
Multiple RMAN catalogs - oracle-l - FreeLists
> and had an idea. I still haven't investigated this thoroughly, but I think
> it could be interesting nonetheless.
>
> I was wondering if anyone ever did this:
>
> I will have a few (say three) main sites (datacenters) where RMAN catalog
> servers will reside. I about 200 sites around the world and I wanted the
> clients to be able to use any catalog indistinctly. So, for instance, if
> CATALOG_A goes down, or there is a major incident in the DC that causes the
> whole site to be inaccesible or something like that, that other sites won't
> be affected. Media servers will be at each site, so there is no problem
> there. But I was wondering if there was a way to keep three different
> catalogs in sync. I though Streams (as they will be 10g dbs) but I'm not
> sure how rman will behave with streams, or if i would be violating any
> license agreement ;-)
>
> The other way I had though of was dataguard, but that would imply
> rebuilding it should the primary fail for some reason, and would require
> DBAs to intervene and posibly modify TNS entries around the world (I'm
> actually thinking of using virtual IPs here... I'd have to check with
> network guys first).
