Can you select a PDB’s character set?

Can you select a PDB's character set?Since Oracle Database 12.2.0.1 a Multitenant container database can host PDBs with different character sets. This was a huge restriction in Oracle Database 12.1., at least outside the US and Canada. Here in Germany alone you may find plenty of different database character sets, for instance WE8ISO8859P1, WE8ISO8859P9, WE8ISO8859P15, WE8MSWIN1252, maybe still some old WE8DEC – and of course the unicode ones UTF8 and AL32UTF8.… [Read More]

Create Multitenant databases with DBCA – Things to Know

Create Multitenant databases with DBCA - Things to KnowWhen 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]

Lost AWR snapshots reappear again in Oracle 12.2 in Multitenant

Lost AWR snapshots reappear again in Oracle 12.2 in MultitenantWhat 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

Fallback Strategy: Flashback Pluggable Database in Oracle 12.2Since 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

ORA-44787 - Don't mess with the Default Oracle ServiceAt 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

Hiding information is not good - and exclude_seed_cdb_view is now an underscore in Oracle 12.2I 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

Oracle MultitenantThis 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]