Thanks for the clarification about egress. I do remember now the first 10TB
being free. That seems like a big amount but it all depends on how large
your remote cloud tables are.
On Mon, Jul 19, 2021 at 10:27 AM Neil Chandler <neil_chandler@xxxxxxxxxxx>
wrote:
It's an excellent point. However, there are egress charges in OCI
(although somewhat lower than AWS/Azure). The first 10TB per tenancy per
month are free. It would not take a lot of queries with the driving site
being on-prem to gobble that up.
Neil Chandler
Database Guy.
------------------------------
*From:* oracle-l-bounce@xxxxxxxxxxxxx <oracle-l-bounce@xxxxxxxxxxxxx> on
behalf of Jeff Chirco <backseatdba@xxxxxxxxx>
*Sent:* 19 July 2021 17:02
*To:* Kellyn Pot'Vin-Gorman <dbakevlar@xxxxxxxxx>
*Cc:* mcdonald.connor@xxxxxxxxx <mcdonald.connor@xxxxxxxxx>;
oracle-l-freelist <oracle-l@xxxxxxxxxxxxx>
*Subject:* Re: dblinks to cloud instance
That is a good point about egress. This is a MSSQL instance running on
Oracle Cloud Infrastructure actually. I don't believe there is any egress
charges.
On Sun, Jul 18, 2021 at 9:58 AM Kellyn Pot'Vin-Gorman <dbakevlar@xxxxxxxxx>
wrote:
Hate to pile onto this, but has anyone considered the egress charges from
the cloud to onprem?
This is why I so often am moving everything to the cloud. And if this is
just the beginning, they had better look into that cost!
Hope this helps,
Kellyn
On Sat, Jul 17, 2021 at 7:49 PM Connor McDonald <mcdonald.connor@xxxxxxxxx>
wrote:
Latency is a cloud killer :-)
This is not to say it can/should not be done, but typically you'll want to
give some thought to app design to accommodate it.
eg if you're going query a table "n" times over the course of a certain
time duration, perhaps drag the table (or subset) down to the local node
once into a local table or mview, and then use it.
One risk of cross-database joins is the optimizer making the decision on
where to do the join - driving_site can mitigate this risk to some degree.
On Thu, Jul 15, 2021 at 10:46 PM Jeff Chirco <backseatdba@xxxxxxxxx>
wrote:
What is your opinion on joining to a table over a database link that
resides in the cloud and your local database is on prem? And what if this
cloud instance is MSSQL and your local is Oracle?
We have something in the works that I just found out is supposed to go to
production next week. They are joining local and remote tables together. So
far in testing things are looking ok but the amount of data is limited
right now, I am unsure how much it will grow to.
Wondering if anyone has any experience with this.
Thanks,
Jeff
