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TechTalk v5.0 – The Age of Big Data with Alex Morrise

Who: Hosted by Blackbird, with a speaking session by Alex Morrise, Chief Data Scientist at Pythian. What: TechTalk presentation, beer, wine, snacks and Q&A Where: Blackbird HQ – 712 Tehama Street (corner of 8th and Tehama) San Francisco, CA When: Thursday July 31, 2014 from 6:00-8:00 PM How: RSVP here! TechTalk v5.0 welcomes to the…

Unexpected Shutdown Caused by ASR

In past few days I had two incidents and an outage, for just a few minutes. However, outage in a production environment is related to cost relatively and strictly. The server that had outage was because of failing over and then failing back about 4 to 5 times in 15 minutes. I was holding pager,…

Logging for Slackers

When I’m not working on Big Data infrastructure for clients, I develop a few internal web applications and side projects. It’s very satisfying to write a Django app in an afternoon and throw it on Heroku, but there comes a time when people actually start to use it. They find bugs, they complain about downtime,…

Happy System Administrator Appreciation Day

Today is our day. July 25, 2014 marks the 15th annual System Administrator Appreciation Day. On this day we pause and take a moment to forget the impossible tasks, nonexistent budgets, and often unrealistic timelines to say thank you to those people who keeps everything working — system administrators. So much of what has become a…

Exploring Options of Using RMAN Configure to Simplify Backup

I am a simple person who likes simple things, especially RMAN backup implementation. I have yet to understand why RMAN backup implementation does not use configure command, and if you have a good explanation, please share. Examples for RMAN configure command configure device type disk parallelism 2 backup type to compressed backupset; configure channel device…

Using SaltStack for Configuration Management

In my last blog post I mentioned that SaltStack is a fully featured configuration management solution, but we never looked into using the tool in that way. Today we will begin to explore some basic examples of configuration management with SaltStack.  We will look at two aspects of configuration management, installing a package, and will…

How To Correlate Oracle Database Transaction with GoldenGate

So there I was troubleshooting GoldenGate issue and was puzzled as to why GoldenGate transactions were not seen from Oracle database. I had the transaction XID correct; however, I was filtering by ACTIVE transaction from Oracle which was causing the issue. Please allow me to share a test case so that you don’t get stumped…

Changing Failgroup of ASM Disks in Exadata

There was a discrepancy in the failgroups of couple of ASM disks in Exadata. In Exadata, the cell name corresponds to the failgroup name. But there were couple of disks with different failgroup names. Using the following plan to rectify the issue online without any downtime:

Small Files on MapR-FS

One of the well-known best practices for HDFS is to store data in few large files, rather than a large number of small ones. There are a few problems related to using many small files but the ultimate HDFS killer is that the memory consumption on the name node is proportional to the number of…

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