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Active Data Guard

Account locking in an Active Data Guard environment

During the Data Guard round table of the excellent UKOUG Tech18 conference I got aware of this topic that I’d like to share with the Oracle community:

What is the locking behavior for user accounts in an environment where users may connect to the primary as well as to the standby database?

18c: No Active Data Guard required (and detected) when only CDB$ROOT and PDB$SEED are opened in read-only

When you clone a PDB on the primary CDB, you want that the same is automatically done on the standby ones. Unfortunately, for this operation, the CDB must be opened read-only. In 12.1 even the PDB needed to be opened read-only (Ludovico Caldara reported this in his blog). This, as far as I know, was fixed in 12.2 where MRP reads the files without the need to have the PDB opened. But another problem comes with online cloning, as reported by Alain Fuhrer in his blog, where the CDB needs to be opened read-only with real-time apply. This again requires the Active Data Guard option, which is then mandatory to use all power from the multitenant option.

Join me in a FREE live webcast about Real-Time Query!

On Thursday, 2nd October, 12:30 CET I will be doing a Live Webcast with many demonstrations about Data Guard Real-Time Query.

The shown features all work with 11g already.

Register here.

805-banner-dataguardrealtime-v1-2294812Addendum: The webcast was done already.

Active Data Guard – what does it mean?

There are misconceptions and half-truths about that term that I see time after time again in forums, postings and comments.

Some people think that Active Data Guard is a fancy marketing term for Standby Databases in Oracle. Wrong, that is just plain Data Guard :-)

Most people think that Active Data Guard means that a Physical Standby Database can be used for queries while it is still applying redo. Not the whole truth, because that is just one featureReal-Time Query – which is included in the Active Data Guard option.

Active Data Guard is an option, coming with an extra charge. Active is supposed to indicate that you can use the standby database for production usage – it is not just waiting for the primary database to fail.

In 11g, Active Data Guard includes three features:

Using Two Temporary Tablespaces in PeopleSoft

A longer version of this posting, with all necessary code and a demonstration test, is available as a technical note on the Go-Faster website.  I am working with two different PeopleSoft customers who have had challenges with the size of the temporary tablespaces.  Critical batch processes have failed because they have exhausted space in the temporary tablespace.
#eeeeee; border: 0px solid #000000; font-family: courier new; font-size: 85%; overflow: auto; padding-left: 4px; padding-right: 4px; width: 95%;">ORA-01652 unable to extend temporary segment...

Using Two Temporary Tablespaces in PeopleSoft

A longer version of this posting, with all necessary code and a demonstration test, is available as a technical note on the Go-Faster website.  I am working with two different PeopleSoft customers who have had challenges with the size of the temporary tablespaces.  Critical batch processes have failed because they have exhausted space in the temporary tablespace.
#eeeeee; border: 0px solid #000000; font-family: courier new; font-size: 85%; overflow: auto; padding-left: 4px; padding-right: 4px; width: 95%;">ORA-01652 unable to extend temporary segment...