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When cloning a PDB from a remote CDB you need to define a database link to be used in the CREATE PLUGGABLE DATABASE … FROM …@… command. The documentation is not completely clear about the privileges required on the source for the user defined in the database link, so here are the different possibilities.

Remote clone

Here is what the documentation says:CapturePDBPrivsClone

So you can connect to the CDB or to the PDB.

Multitentant (Pluggable Database) Videos

It’s been over 2 years since 12c was released and there still seems to be a lot of confusion about the pluggable database stuff. I think most people know the top-level concept, there’s only so many times you can see the memory stick analogy before it gets burned on your skull, but that doesn’t do much to help with the reality of working with it day-to-day.

PDB Logging Clause… Again…

About 14 months ago I spotted a problem with the PDB Logging Clause. I opened an SR and several months later I got a patch, which unfortunately didn’t fix the issue, just altered the symptom somewhat. I wrote about that patch here.

Yesterday I got a new patch, which actually does fix the problem, so now the PDB Logging Clause works as documented!

I’ve updated the PDB Logging Clause article to reflect the change.

IO Resource Manager for Pluggable Databases in Exadata

Another interesting topic that goes over and above the CDB Resource Manager Plans I described earlier this week is the implementation of IORM Plans for Pluggable Databases. Pluggable Databases are an interesting object for studies, and I like to research things. When 12c came out there was no support for offloading initially, it is required that you are on cell software 12.1.x.x.x for full 12c support on Exadata. One aspect I was particularly interested in were PDBs and IORM. Limiting CPU on a PDB basis is already a cool thing, but in a hugely consolidated environment it does make sense to limit I/O based on a consumer group. Another one of the perks of working on Exadata :)

OOW14 Session: RAC'fying Multitenant

Thank you for attending my session RAC'fying Multitenant at Oracle Open World 2014. You can download the slide deck here.

[Updated] Oct 4th, 2014: The article on multitenant I wrote for OTN is available here. This article shows various commands I referenced in my session, e.g. point in time recovery of PDBs.

As always I would love to hear from you.

Multitenant : PDB CONTAINERS Clause

I forgot to mention, I put another multitenant article live at the weekend.

I’m not sure I will ever use it, but it’s good to know it’s there.

I was originally working on an article on a completely different multitenant feature, but the examples I was using highlighted a bug, which kind-of scuppered that article. I’ve raised an SR and I’m waiting on the acknowledgement and possible fix. I’ll hold that article back until the fix is in place.



To PDB or not to PDB : The final decision

After yesterday’s to PDB or not to PDB post, I decided the answer was “to PDB”. Here’s what I did…

To PDB or not to PDB

I’m about to start a Proof of Concept (POC) for a 12c upgrade of one of our databases. The production database in question is running on Oracle Linux inside a VMware virtual machine, so the starting point I’ve been given for the POC is a clone of the whole VM…

Probably the biggest decision I’ve got to make is “to PDB or not to PDB” *. I mentioned it on Twitter earlier and got some conflicting opinions. I guess the pros and cons of the PDB approach go something like this in my head.


Oracle 12c Multitenant Option : CDBs and PDBs…

I started trying to play with the Oracle multitenant option (all that pluggable database stuff) a little while ago and gave up. It’s wasn’t that it was that difficult. More than anything my problem was I didn’t know what to focus on first. There is so much to it and it’s all interrelated, so you start to write about one small piece and before you know it your article has lost focus and is growing too big. As a result I decided to let it simmer in the background and start looking at some of the other smaller 12c new features first…

My next stumbling block was just about everything in 12c seems to relate back to pluggable databases in some way. So you either pretend it doesn’t exist and have gaping wholes in everything you write, or you have to bite the bullet and get to grips with pluggable databases. So back I came to pluggable databases…