ORA-56841: Master Diskmon cannot connect to a CELL

Faced this error while querying v$asm_disk after adding new storage cell IPs to cellip.ora on DB nodes of an existing cluster on Exadata. Query ends with ORA-03113 end-of-file on communication channel and ORA-56841 is reported in $ORA_CRS_HOME/log/<hostname>/diskmon/diskmon.log. Reason in my case was that the new cell was using different subnet for IB. It was pingable from the db nodes but querying v$asm_disk wasn’t working. Changing the subnet for IB on new cell to (more...)

ORA-01671 while creating cascaded standby from standby using RMAN DUPLICATE

On a T5 Super Cluster (running 11.2.0.3) I was creating a cascaded standby from an already functional standby using RMAN DUPLICATE and it errored out with

ORA-01671: control file is a backup, cannot make a standby control file

 

A quick search reveals that it is bug 11715084 that affects most of the 11.x versions except 11.2.0.4. There is a one off patch available for most of the versions (more...)

Sangam 15

This was my 6th year at Sangam and as always was good fun. We were a group of 4 people who were traveling from Delhi and we reached Hyderabad on Friday morning. Just wanted to keep a day for visiting Ramoji Film City and also wanted to avoid the rush that morning travel on the conference’s starting day brings. So after dropping the luggage at the hotel we hired a taxi and reached Ramoji Film City. (more...)

MRP process on standby stops with ORA-00600

A rather not so great post about an ORA-00600 error i faced on a standby database. Environement was 11.2.0.3 on Sun Super Cluster machine. MRP process was hitting ORA-00600 while trying to apply a specific archive log.

The error message was something like this

MRP0: Background Media Recovery terminated with error 600
Errors in file /u01/app/oracle/product/11.2.0.3/diag/diag/rdbms/xxxprd/xxxprd1/trace/xxxprd1_pr00_6342.trc:
ORA-00600: internal error code, arguments: [2619], [539], [], [], [], [], [],  (more...)

Writing tips

Tim Hall has written some brilliant posts about getting going with writing (blogs, whitepapers etc). This post is the result of inspiration from there only. Tim says that just get started with whatever Winking smile.

If you are into blogging and no so active or even if you aren’t you may want to take a look at all the posts to get some inspiration to document the knowledge you gain on day to day basis.

Here is (more...)

Want to learn Exadata ?

Many people have asked me this question that how they can learn Exadata ? It starts sounding even more difficult as a lot of people don’t have access to Exadata environments. So thought about writing a small post on the same.

It actually is not as difficult as it sounds. There are a lot of really good resources available from where you can learn about Exadata architecture and the things that work differently from any non-Exadata (more...)

VirtualBox and Windows driver verifier

I was troubleshooting some Windows hangs on my Desktop system running Windows 8 and enabled driver verifier. Today when I tried to start VirtualBox it failed with this error message.

Failed to load VMMR0.r0 (VERR_LDR_MISMATCH_NATIVE)

Most of the online forums were asking to reinstall VirtualBox to fix the issue. But one of the thread mentioned that it was being caused by Windows Driver Verifier. I disabled it, restarted Windows and VirtualBox worked like a (more...)

Oracle GoldenGate 11g Handbook

Few months ago I contributed a chapter (on Monitoring, Troubleshooting and Performance tuning) to a GoldenGate book on Oracle Press that Robert Freeman was authoring. Thought of posting a small update that the book is now out. My name doesn’t appear on the main page Sad smile but you will see it (more...)

Oracle database 12c

So there is a new toy in the market for database geeks : Oracle has released database 12c. Every social platform is abuzz with the 12c activity. So thought that I should also complete the ritual Winking smile

In this post Aman has already summed up many important links.

Maria Colgan has (more...)

agent deployment error in EM 12c

Yesterday I was configuring EM 12c for a Sun Super Cluster system. There were a total of 4 LDOMs where I needed to deploy the agent (Setup –> Add targets –> Add targets manually). Out of these 4 everything went fine for 2 LDOMs but for the other two it (more...)