Change system time in RAC cluster

Hi,
We need to change the system time of two nodes involded in a RAC cluster, both the nodes are almost 15 minutes ahead of real time but are in sync with each other.
Does Oracle database require to bounce to get the latest changed time?
or does the whole cluster services needed to be stopped for 15 minutes after changing the time and then started? just in case not to confused with the transactions happened when the system was 15 minutes ahead.
The metalink note ID 368539.1 explains that PMON process does the service registration when the database was started. The PMON will not take the changed time dynamically?
We have oracle 10.2.0.2 database on HP UX 11.31
Please clear this confusion.
Thanks.

Your RAC Cluster would be using either of
a. NTP --- external to Oracle
b. Oracle Cluster Time Synchronization Service -- part of the Oracle Grid Infrastructure
It seems that you are not using NTP -- else the two nodes would have the same time as "the rest of the world".
You should see "Cluster Time Synchronization Service" in your clusterware logs.
Since you plan to reset the time backwards, I suggest that you shutdown and reset the time manually.
Remember that timestamps written to various log files and "last update" time of various files themselves, will duplicate or overlap with existing files.
Note : PMON service registration doesn't come into play here.
Hemant K Chitale

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~

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