No worries, I haven’t become lazy recently. But the past weeks were more busy than anything I have experienced so far. And I had a full week off and enjoyed the silence and absence from blogs and cell phones and email in the mountains. But now I’m back – and surprise, surprise – this week on Thursday we’ll have our 11th Virtual Classroom Seminar: Fallback Is Your Insurance – on Nov 11, 2021.
When will it happen?
Thursday, Nov 11, 2021 – 10:00h CET
What are we going to talk about?
Fallback and Rollback. How to secure your job. And why fallback and rollback are so important.
You don’t believe us? Trust me, I have seen customers crying. When I started my career in Oracle in Support, Novell Netware was hip and sort-of trendy. If you need to google now what I’m talking about, you get a good sense how old I am and how young you are 🙂 Anyway, there was this fine feature on Netware called “Compressed Volumes”. Bad thing for Oracle: It fully corrupted your database. We had a customer loading the companies Novell server in the trunk of the car. And then he drove over 1000km across Germany. My colleague Thorsten Grambs tried to unload the leftover remains of the data with DUL – and he could save about 300 kB. You can imagine how the customer felt. And we felt so sorry with the guy since he needed also to drive back across Germany, and tell his boss what has happened.
This is why you need to register. Now!!
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Topics we will cover
- Compatible
- Time Zone
- Rollback vs Fallback
- Backups, Flashback, Downgrade, Data Pump, GoldenGate
- Revert from a non-CDB to non-CDB upgrade or a CDB to CDB upgrade
- With a standby in place
- Of course, using a RAC database
- Revert from a Multitenant migration from non-CDB to PDB
- Revert from a PDB unplug / plug operation
- How to practice
Questions?
As usual, we will be there to take your questions live – and hopefully answer all of them.
You haven’t registered yet?
Will the video be available for on-demand viewing?
Yes, of course – please find it here: Youtube Database Upgrade Channel
You want more?
Here we go – you find our previous seminars here – and many many additional videos on our Youtube Channel.
–Mike
Mike,
I completely agree about the need to have fallback/rollback option. We are in the process of migrating some of our large databases (less than 10 TB in size) to OC@C but we are being told by Oracle that migrations are one way offering and there is no rollback provided, even when we opt to use replication based migration (using GoldenGate).
I think this puts us in an uncomfortable situation as we are not in a position to answer, what I would call a valid question that “How do we revert if things don’t work on Monday?”
Would you have any thoughts on why migration to OC@C are one way affair (or have we not negotiated well?)?
Hi Narendra,
I really can’t tell you – I would need to know who told you that. Everything we showed in the seminar works, regardless whether you migrate to ExaCC or to a normal server.
I could only think that the reason may be the encryption you normally enable after the migration. So this would require then either an RMAN decrypt afterwards when you move out, or ASO option on your previous server.
Cheers,
Mike
Thanks Mike.
We are migrating from 11.2.0.4 to 19c on ExaCC, typically using O-2-O method but for our large databases (between 1TB and 10TB in size), we are exploring whether we can use O-O-O method in order to reduce the downtime during migration. Not sure if RMAN is being used in any way but thank you for highlighting the encryption, something that I had not thought of.
Hi Narendra,
O2O and OOO both use a combination of expdp/impdp and CTAS over DB-Links. And OOO uses Oracle GoldenGate on top. Hence, no RMAN backup used.
Thanks, and I hope all works fine!
Mike