OFFICIAL PYTHIAN BLOG

Industry insight and analysis covering Big Data, Hadoop, MongoDB, Oracle, SQL Server, MySQL, and more.

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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 risks that the leap second on June 30th, 2015 introduces. On the other hand, I…

Cassandra Update – Leap Second & JMX Security

2000px-Cassandra_logo.svg

This is a short post about two things that should be on the to-do list for all Cassandra Administrators. The leap second issue and the new JMX default. The Leap Second Before we move on you should learn more about how the leap second affects Cassandra in more detail. In short, you must update your JVM to version…

Part 1: How to Effectively Use a Performance Schema

Performance Schema (PS) has been the subject of many, many recent discussions, presentations, and articles.  After its release in MySQL 5.7, PS has become the main actor for people who want to take the further steps in MySQL monitoring. At the same time, it has become clear that Oracle intends to make PS powerful with…

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. There are a few issues that could be caused by the leap second, so I’ve…

MySQL Query Profiling with Performance Schema

One of my favorite tools for query optimization is profiling. But recently I noticed this warning: After looking through certain documentation , I should indeed start using the Performance Schema to get this information. Okay, so let’s give that a try. I confirmed that I started MySQL 5.6.23 with the default of Performance Schema = ON:…

Making Existing SQLPLUS Scripts 12c and Container DB (PDB) Compatible

Oracle 12c introduces new catalog features including CDB_ dictionary views (which include a CON_ID column) superseding the DBA_ views that most DBA sqlplus scripts are based upon. However, existing DBA sqlplus scripts can easily be modified using just a few simple sqlplus techniques to be compatible with 11g, as well as all types of 12c…

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