Tag: Linux

Mongostat – A Nifty Tool for Mongo DBAs

One of the main MongoDB DBA’s task is to monitor the usage of MongoDB system and it’s load distribution. This could be needed for proactive monitoring, troubleshooting during performance degradation, root cause analysis, or capacity planning. Mongostat is a nifty…

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Log Buffer #435: A Carnival of the Vanities for DBAs

Sun of database technologies is shining through the cloud technology. Oracle, SQL Server, MySQL and various other databases are bringing forth some nifty offerings and this Log Buffer Edition covers some of them.

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Handling the Leap Second – Linux

Leap Second

Last week I published a blog post titled “Are You Ready For the Leap Second?“, and by looking at the blog statistics I could tell that many of you read it, and that’s good, because you became aware of the…

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Are you Ready for the Leap Second?

LeapSecond

If you’re not aware of what the leap second is look into it. The fact is, this year the last minute of June 30th will be one second longer and “June 30, 2015 23:59:60” will be a valid and correct time….

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fsfreeze in Linux

The fsfreeze command, is used to suspend and resume access to a file system. This allows consistent snapshots to be taken of the filesystem. fsfreeze supports Ext3/4, ReiserFS, JFS and XFS. A filesystem can be frozen using following command: #…

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Quick Tip : Oracle User Ulimit Doesn’t Reflect Value on /etc/security/limits.conf

So the other day I was trying to do a fresh installation of a new Oracle EM12cR4 in a local VM,  and as I was doing it with the DB 12c, I decided to use the Oracle preinstall RPM to…

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Using strace to debug application errors in linux

strace is a very useful tool which traces system calls and signals for a running process. This helps a lot while debugging application level performance issues and bugs. Aim of this post is to demonstrate the power of strace in…

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Virtual CPUs with Google Compute Engine

After looking at how virtual CPUs are handled in Amazon Web Services and Microsoft Azure, we explore CPU definitions and CPU performance under the Google Compute Engine platform.

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From 0 to Cassandra – An Exhaustive Approach to Installing Cassandra

All around the Internet you can find lots of guides on how to install Cassandra on almost every Linux distro around. But normally all of this information is based on the packaged versions and omit some parts that are deemed…

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Troubleshooting a Multipath Issue

Multipathing allows to configure multiple paths from servers to storage arrays. It provides I/O failover and load balancing. Linux uses device mapper kernel framework to support multipathing. In this post I will explain the steps taken to troubleshoot a multipath…

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