Exadata and node Timestamp

We have a 3rd party application that currently uses triggers and a sequence to maintain the order of transaction. We would like to replace thie logical sequence with a time stamp. We are in the processing of migration to Exada and had a question about timestamp sync on different nodes. For Exadata, what is the maximum time that two nodes will be out of sync. We heard it's 2 minutes nut could not confirm.

Thank you, below, was the response of the Oracle.

Each machine has a different clock frequency and thus derive a slightly different time. NTP calculates this drift of time every 15 minutes approximately and stores this information in a file of "drift", then adjusts the clock system, based on that said drift as compared to a given temporal sys admins - implements. It is the recommended approach.

You can find the value of jitter at the bottom of the order for the difference in time max.

[root@devdb01 ~] # ntpq Pei
refid distance st t when poll reach delay offset jitter
==============================================================================
* ds1000dsp01.ds. 139.78.135.14 2 u 78 1024 377 0, 210 - 7.371 12.191
ds1000dsp02. DS. 10.30.64.205 3 117 1024 377-0,218 0.176 u 7.882

Tags: Database

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