Upcoming conferences – end of 2017

I’ve been accepted to the following upcoming conferences:

Updates to Oracle image copy backup scripts

I added a few larger updates to my Oracle Image Copy backup scripts.

  • Now it also has built in support for Netapp NAS storage
  • In addition to autorestore script there now is restore.py script that you can use to spin off cloned databases restored to a specified point in time

Go and check out the scripts from here

Free code: script suite to manage incrementally updated image copies in Oracle

I just published for free the work I’ve done for the past 1,5 years 🙂

We used to have a few problems with backups:
* Weekly full backup took 2+ days to run on the larger databases and it always took a lot of resources to run.
* To test the backups we needed to allocate the same amount of storage space and it took too long time to restore the database from backup.
* To (more...)

Upcoming conferences, end of 2016

I’ll be presenting “Using image copies for Oracle database backups” at the following upcoming conferences:


Experiences with moving to multitenant in

Lately I’ve been upgrading our 11g Standard Edition databases in test environments to 12c Enterprise Edition and also plugging them in to a multitenant container database.
It’s a new technology for Oracle, but I was still quite surprised about the number of issues I faced when trying to plug in an existing non-CDB database. After resolving all these issues it has been quite painless process since then.

In short, upgrading 11g database to 12c pluggable (more...)

Interesting difference in foreign key locking behavior between heap and index organized tables

I hit this issue by accident, developers wanted to disable inserts to child table so they could perform some one-time maintenance operation, and this maintenance only affected one rown from the parent table (and all it’s children). I started wondering if there is any smaller level impact solution possible than taking a shared read lock on child table.

Database version:, but the same behaviour was also present in 11.2.0. (more...)

RMAN-06172 when restoring a controlfile and dNFS is not turned on

Oracle EE on Linux x86-64.

I got a really surprising error message today when setting up a new data guard standby database.
I created a standby controlfile as usual and placed it on a common NFS share accessible also to the new data guard host:

SQL> alter database create standby controlfile as '/nfs/install/oemdb/cf2.f';

Database altered.

Now, on a new node I tried to restore that controlfile, but got a really (more...)

Presenting “Using image copies for Oracle database backups” at ilOUG Tech Days 2016

I’ll be presenting my brand new presentation “Using image copies for Oracle database backups” at ilOUG Tech Days on 30. May in Israel.

More information about the event can be found here

Abstract of my presentation:
When databases get ever larger and larger, backing them up using traditional RMAN backupsets will quickly get unfeasible. Completing a backup requires too much time and resources, but more importantly the same also applies to restores. RMAN has always (more...)

Does RMAN backup undo optimization also work for image copies?

Since 11.1 RMAN has had a silent new feature – RMAN Backup Undo Optimization. This feature will exclude undo from committed transactions (after undo_retention time has also passed) from backups, possibly making the undo tablespace backup much smaller. The documentation just says that it will work for disk backups and Oracle Secure Backup tape backups. Since lately I’m been playing around a lot with image copy backups I wanted to find out if this (more...)

Presentation: Making MySQL highly available using Oracle Grid Infrastructure

I published my 2014 presentation “Making MySQL highly available using Oracle Grid Infrastructure” in Slideshare. You can view it here: