Are you aware we are having a leap second added at the end of June? Do you know how that affects Exadata? Refer to My Oracle Support document "Leap Second Time Adjustment (e.g. on June 30, 2015 at 23:59:59 UTC) and Its Impact on Exadata Database Machine" from article ID 1986986.1 to find out why you need to be worried about it if you have upgraded any infrastructure to the 12.1.2.1.0 version of software but you do not need to be worried if you have any other version of Exadata software installed.
Do you just want to know more about what a leap second is, and how it affects an Oracle DB? Then MOS article "Leap seconds (extra second in a year) and impact on the Oracle database." from note ID 730795.1 will be your cup of tea while article "How Leap Second Affects The OS Clock on Linux and Oracle VM" from document ID 1453523.1 clues you in on how the Linux OS could be affected with or without the ntp service being installed on your system.
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