Google Cloud Platform Fundamentals in Sydney

Just finished up one day training at Google's Sydney office in Google Cloud Platform Fundamentals. GCP is pretty cool and I think I like it.

Lots of our customers at Pythian are already hosting, migrating and thinking of doing so on cloud. Pythian already has a huge presence in cloud using various technologies.

So it was good to learn something about the Google's cloud offering. It was a pleasant surprise as it all made sense. (more...)

Speaking at APAC OTN TOUR 2016 in Wellington, New Zealand

The APAC OTN Tour 2016 will be running from October 26th until November 11th visiting 4 countries/7 Cities in the Asia Pacific Region.

I will be speaking at APAC OTN TOUR 2016 in Wellington, New Zealand on 26th October on the topic which is very near and dear to me; Exadata and Cloud.

My session is 12c Multi-Tenancy and Exadata IORM: An Ideal Cloud Based Resource Management with Fahd Mirza

Hope to see you there !

ORA-01156 When Adding Standby Redo Log in Dataguard Configuration

Database version =

If you get following error while adding a Standby Redo Log (SRL) to a standby database in dataguard configuration:

SQL> alter database add standby logfile group 3 '/logs/test/sbyredo3a.log' size 500M;
alter database add standby logfile group 3 '/logs/test/sbyredo3a.log' size 500M
ERROR at line 1:
ORA-01156: recovery or flashback in progress may need access to files

Then it means that first you have to stop (more...)

WordPress Fatal error: Call to undefined method PHPMailer::getCustomHeaders()

With numerous new themes and new versions of the wordpress, when you try to publish some post or page or try to send email or try to use contact form, you might get following error:

Fatal error: Call to undefined method PHPMailer::getCustomHeaders()

This error normally occurs if you are using incompatible wordpress and theme and plugin versions. The best course of action is to update your wordpress, your theme, and all the plugin and make (more...)

Opatchauto Session failed: Parameter validation failed

While applying PSU on Grid Home in 12c, due to the patch conflict, you might have to rollback few patches before you could apply the PSU.

After rolling back the patches from grid home, when you try to run the opatch analyze command again, you might encounter following error:

Step by Step Jan 2016 PSU Patch Apply on 12c Grid and RDBMS Homes in Linux

Following step by step action plan is for single instance database stored on ASM in on Linux (OEL 6 64 bit in this case.)


There might be a situation where executing some DDL in pluggable database may cause the following error:

ORA-65040: operation not allowed from within a pluggable database

This error could occur if a tablespace is being dropped from within PDB and this tablespace is a former default tablespace having some of the system objects. Even system objects cannot be moved with simple alter statements from within PDBs.

So in order to move these objects from within (more...)

Got Published in AUSOUG’s Foresight Online Spring 2015

AUSOUG's Foresight Online Spring 2015 Edition is the premier publication by Australian Oracle User Group.

Following are highlights of this edition:

  • President's Message
  • DBA Article: Automated Testing of Oracle BPM Suite 12c Processes with SOAP UI - Peter Kemp, State Revenue Office, Victoria
  • DBA Article: Best Practices for Oracle on Pure Storage
  • Apps Article: Performance Review Data Capture - Brad Sayer, More4Apps
  • DBA / Dev Article: Database Developers – Feeling (more...)

Sharding in Oracle 12c Database

Sharding for Oracle DBAs is still pretty much an alien or pretty new concept. In the realms of big data, this term is being used quite extensively though.

What is Sharding in simple words:

Sharding is partitioning. Horizontal partitioning to be exact.

Sharding means partitioning a table rows on basis of some criteria and storing that partitioned rows of table (i.e. a shard) on different database servers. These database servers are cheap low commodity (more...)

ORA-01917: user or role ‘PDB_DBA’ does not exist

I manually created a container database (CDB) in my Linux 6.4 based virutal machine. After creating it, I tried to create a pluggable database but got following error:

SQL> select instance_name,status from v$instance;

---------------- ------------
cdbtest          OPEN

1 row selected.

SQL> show con_name


SQL> select * from cdb_pdbs;

      DBID    CON_UID GUID                             STATUS    CREATION_SCN
---------- ---------- -------------------------------- --------- ------------