Daylight savings and DBMS Jobs

I have this Shop Floor Control application that depends on a
cyclic job running 10secs. I am really worried that this job
might not run for 1 hour during the time change on Sunday
Morning. (We run our servers on N/York time).
The obvious solution is to wake up in the night to manually
reschedule the job. But does anyone know if Oracle has a built-
in to handle this?

Same problem here in Switzerland. I sync via iTunes from Outlook to iPhone, and all time are one hour wrong since a few days.

Similar Messages

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    LinuxNewbie1,
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    Read here:
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    This has been discussed at length in
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  • Daylight Savings time, and how dates are stored internally and displayed

    This is probably a question that appears here annually, but I couldn't really find clear answers, so I'll try asking this in my own words:
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    >
    That settles that! Thank you! My theory was wrong! I appreciate the help.
    >
    You may think it settles that but, sorry to burst your bubble, that doesn't really settle much of anything.
    One thing that was settled is the answer to this question
    >
    But are they talking about what you can EXTRACT and DISPLAY from the field or what is actually STORED internally?
    >
    which is, as Mark stated, they are talking about what is stored internally.
    The other thing that was settled is that you will pull the same, or mostly the same, data twice during that one hour. I say 'mostly the same' because of the major flaw your extraction method has to begin with.
    >
    If you store SYSDATE in a DATE column in row “X” at 1:30 AM before the time change, and you store sysdate in row “Y” exactly one hour later, will Oracle say that X’s timestamp is 60 minutes less than Y’s timestamp?
    >
    No - they will have the same time since 'one hour later' would have been 2:30 AM but the clock was turned back an hour so is again 1:30 AM. So the second time your job runs for 5 minutes at 1:30 AM it will pull both the original 1:30 AM data AND the data inserted an hour later.
    And Oracle will say that data stored in row "Z" exactly 45 minutes later than "X" at 1:30 AM will have a date of 1:15 AM and will appear to have been stored earlier.
    Your method of extracting data is seriously flawed to begin with so the daylight savings time issue is the least of your problems. The reason is related to the answer to this question you asked
    >
    do people avoid using DATE and TIMESTAMP datatypes because they are too simple?
    >
    That method isn't reliable - that is why people avoid using a date/timestamp value for pulling data. And the more often you pull data the worse the problems will be.
    >
    I've got an Oracle application that runs every 5 minutes around the clock, and it selects records from a certain table whose updated timestamp (TIMESTAMP(6)) is greater than SYSDATE - 5/1440, meaning any record that was updated in the last 5 minutes
    >
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    2. The transaction is COMMITTED at 12:03 AM.
    3. Your job, which runs every five minutes pulls data for the period 11:55:00 AM to 11:59:59 AM. This job will NOT see the records inserted in step #1 because they had not been committed when your job query began execution - read consistency
    4. Your job next pulls data for the period 12:00:00 AM to 12:04:59 AM. This job will also NOT see the records inserted in step #1 because the SYSDATE value used was 11:59 AM which is BEFORE this jobs time range.
    You have one or ANY NUMBER of records that ARE NEVER PULLED!
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    Creating your tables with ROW DEPENDENCIES will store an SCN at the row level (at a cost of about 6 bytes per row) and you can use the commit SCN to pull data.
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  • IdM Scheduler and Time Change to Daylight Savings Time GMT to BST

    This isn't really a 'question' , but just a topic for discussion.
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    Edited by: Paul Abrahamson on Mar 27, 2011 10:51 AM

    Read here:
    http://www.appleinsider.com/articles/10/10/11/applesays_ios_software_update_to_fix_pesky_alarm_clockbug.html

  • Site synchronization and daylight savings/standard time

    The familiar problem of Dreamweaver not accounting for the
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    Ethan H wrote:
    > The familiar problem of Dreamweaver not accounting for
    the change from Daylight
    > Savings to Standard time persists with CS3.
    Yes, it's a bug, and it's a PITA.
    > Message to Adobe: Please fix this problem.
    Message to Ethan H: This is a user-to-user forum. To get the
    message to
    the right people in Adobe, submit a bug report:
    http://www.adobe.com/cfusion/mmform/index.cfm?name=wishform
    Yes, I'm sure that Adobe knows about the problem without you
    going to
    the effort to submit a report, but the bug report/feature
    request form
    is how the development team assesses its priorities.
    David Powers, Adobe Community Expert
    Author, "The Essential Guide to Dreamweaver CS3" (friends of
    ED)
    Author, "PHP Solutions" (friends of ED)
    http://foundationphp.com/

  • Daylight Savings Time and Alarmsk

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  • Daylight Savings Time and Time Zone Issue:

    Howdy!  Many of us woke up this morning to be dismayed to find that our iPhone was TWO hours behind instead of falling back one for the Daylight Savings Time adjustment, and were late for church.  I have an iPhone 4S, with iOS 5...
    I was working at that time of morning, and the initial switch went well.  However, when I woke up, the clock was yet another hour behind.  A little investigation showed that the Time zone had been changed to Denver (It was previously on Chicaco, and I live in Dallas.)  I tried to select it to change it, and it wouldn't allow me.  If I turned off the Set Automatically feature, then I could change it, but when I turned the Set Automatically feature back on, it would re-set the time zone to Denver.
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    Hi,
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    regards,
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