When you create Multitenant databases with DBCA there are some Things to Know. And in Oracle Database 12.2.0.1’s Database Creation Assistant (DBCA) there is a common pitfall in the “Options” screen. It was grayed out in the previous release but when you choose to create a “custom” database you can select the options/components now.… [Read More]
Category Archives: Single-/Multitenant
Lost AWR snapshots reappear again in Oracle 12.2 in Multitenant
What a strange topic. And I thought I never will blog about this. But as I have received the same question for the third time today, I think there’s a bit clarification needed. Lost AWR snapshots reappear in Oracle 12.2 in Multitenant pluggable databases.
Magically …
Lost AWR snapshots reappear again in Oracle 12.2 in Multitenant
In a non-CDB database you have your local AWR data stored in the SYSAUX tablespace.… [Read More]
Fallback Strategy: Flashback Pluggable Database
Since Oracle Database 12.2 an important feature works now for pluggable databases as a Fallback Strategy: Flashback Pluggable Database in Oracle 12.2. This was missing in Oracle Database 12.1.
Actually I missed this feature a lot as I use “Flashback” almost everyday. And you could only rewind the entire deployment with a FLASHBACK DATABASE command.… [Read More]
ORA-44787 – Don’t mess with the Default Oracle Service
At the moment I work with one of our reference customers, Swiss Mobiliar Insurance, on their Multitenant upgrade to Oracle Database 12.2.0.1. And we encountered an “interesting” issue. After upgrade we received an ORA-44787 making it impossible to switch between containers with “alter session set container=pdb1;” commands.… [Read More]
Why EXCLUDE_SEED_CDB_VIEW is now an underscore in Oracle 12.2
I have received several questions from customers in the past weeks using Oracle Multitenant about the parameter exclude_seed_cdb_view.It magically disappeared and morphed into _exclude_seed_cdb_view since Oracle Database 12.2.0.1. To be fair, the exclude_seed_cdb_view is listed in the list of obsolete parameters in Oracle Database 12.2.0.1.
What is EXCLUDE_SEED_CDB_VIEW?
This parameter hides everything belonging to the PDB$SEED from the usual queries.… [Read More]
Can you simply switch from SE2 to EE with Oracle Multitenant
This question is coming up from time to time – and currently not covered in the official Oracle documentation as far as I know: “Can you simply switch from SE2 to EE with Oracle Multitenant?”
Yes, you can!
First of all, the switch is possible and tested. But you’ll have to satisfy a few requirements:
- Both database versions must be the same
- Both databases must have the same character set (in Oracle Database 12.1)
That’s it.… [Read More]
Why does the upgrade of PDB$SEED always take longer?
Upgrading the PDB$SEED takes always longer than any other container.
What is the reason for an upgrade of the PDB$SEED taking so much longer in a real world environment?
How does an upgrade with Oracle Multitenant work?
I have written several blog posts in the past about the different techniques to upgrade an Oracle Multitenant environment:
The interesting case happens in the “Everything At Once“.… [Read More]