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From: epokopac@excite.com
Newsgroups: comp.databases.oracle.server
Subject: Re: EM scheduled RMAN backup & daylight saving time
Date: 4 Apr 2007 07:41:05 -0700
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Try this:

OEM Database Control

Administration
  Global Attributes (located under Scheduler)
     "set DEFAULT_TIMEZONE to Canada/Eastern"
        Apply

Or log into SQL*Plus as sysdba and:

execute
dbms_scheduler.set_scheduler_attribute('DEFAULT_TIMEZONE','Canada/
Eastern');

"Bounce" OEM. May NOT be required, but it doesn't take long to do.

My WEEKNIGHT_ and WEEKEND_ Scheduler windows were behaving similar to
your backup issue (i.e. running an hour later than they should since
the switch to DST). Setting the DEFAULT_TIMEZONE to a DST-aware value
(America/New_York) fixed it for me. There was NO value in there
previously.

Regards,

    Eugene