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Does the Leap Second Affect the E-Business Suite?

Steven Chan
Senior Director

Earth blue marbleBack in my salad days, I once took a university-level astronomy course, where I was surprised to learn that the earth's rotational speed varies due to climactic and geologic events.  These speed variations mean that the Coordinated Universal Time (UTC) occasionally needs to be adjusted by a leap second to remain synchronized with the mean solar time (UT1).

The next leap second is scheduled for June 30, 2015.

E-Business Suite users do not need to worry about the impact of leap seconds.  These time adjustment events do not have any impact on EBS operations or data integrity.


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Comments ( 4 )
  • Maris Elsins Thursday, June 11, 2015

    Hi Steven,

    I think the statement, that tbe EBS is not affected, is too strong as there are cases when the leap second can affect the OS (Linux) and the databases. These situations are:

    1. Depending on the OS and NTP configuration. Linux can add the extra second as "23:59:60", which is an invalid time for oracle's DATE and TIMESTAMP datatypes, and will cause ORA errors.

    2. Depending on the Linux kernel and NTP versions (these are few old versions that are affected), it's possible that the server will crash or hang, or java processes will start spinning on CPU.

    I've written about these issues in these 2 blog posts:

    - http://www.pythian.com/blog/are-you-ready-for-the-leap-second/

    - http://www.pythian.com/blog/handling-the-leap-second-linux/

    I agree, this is not a fault in e-Businesss Suite, but still, the eBS users and Operations may be affected.



  • Steven Chan Thursday, June 11, 2015

    Hi, Maris,

    Thanks for your comments. I have specifically restricted the scope of our impact analysis to the E-Business Suite itself. Everything below the E-Business Suite in the stack, including the operating system, is outside of the scope of this statement.



  • sai Monday, June 22, 2015

    Hi Stven,

    Does this effect EBS on RAC Cluster ?



  • Steven Chan Monday, June 22, 2015

    Hello, Sai,

    As noted in my comment to Maris, above, our impact analysis concerns only the E-Business Suite's executable code. The layers below -- including your server (and server-based operating systems), storage systems, and other third-party components -- are outside of the scope of this impact analysis.

    You should check with the Database Support team to verify the impact on your RAC setup.



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