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Re: Java DB rotation

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On 1/30/2012 9:17 PM, Jim Lee wrote:
> On Mon, 30 Jan 2012 21:12:14 -0500, Arne Vajh?j<arne@vajhoej.dk>
> wrote:
>
>> On 1/30/2012 9:08 PM, Jim Lee wrote:
>>> I have a Java server controller that read/write to Database table
>>>
>>> Java server will start read / write to a new DB table every
>>> week/monday
>>> e.g.
>>> table-1-2-2012
>>> table-1-9-2012
>>> table-1-16-2012
>>> table-1-23-2012 ... etc
>>>
>>> I think of 2 ways to do the DB table rotation
>>>
>>> 1) check the server timestamp, if today's date is week of 1-23-2012,
>>> then read/write to table-1-23-
>>>
>>> 2012
>>>
>>> 2) have a unix corn job run every monday to generate a text file on
>>> Java server with DB table named on
>>>
>>> that date -  on each Java request, check the text file's table name -
>>> then read/write to that DB table
>>>
>>> any other solution to DB table rotation?
>>>
>>> the first way check timestamp have a drawback when server's time is
>>> not set to correct time, since
>>>
>>> there are many Java server running for load balance, it's not a good
>>> idea.
>>>
>>> the second way is a better solution, but request additional setup -
>>> cron job
>>
>> I can not see any any problems with construction the table
>> name every time you need it.
>
> to construct the table name, i need to use the server timestamp, what
> if the server time is incorrect? then everything is messed up?  On
> linux, is the server time always in sync with internet time server? or
> it's depended on the motherboard BIOS time?

If you can not get the time correctly to construct a tablename
then you can not get the time correctly to write to the file.

You can setup NTP to synch time.

But does it matter if one server is 2 seconds off?

Arne

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Thread

Java DB rotation Jim Lee <jimlee2907@yahoo.com> - 2012-01-30 18:08 -0800
  Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-30 21:12 -0500
    Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-30 21:14 -0500
      Re: Java DB rotation Jim Lee <jimlee2907@yahoo.com> - 2012-01-30 18:20 -0800
        Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-30 21:34 -0500
        Re: Java DB rotation Robert Klemme <shortcutter@googlemail.com> - 2012-01-31 08:36 +0100
    Re: Java DB rotation Jim Lee <jimlee2907@yahoo.com> - 2012-01-30 18:17 -0800
      Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-30 21:20 -0500
        Re: Java DB rotation Jim Lee <jimlee2907@yahoo.com> - 2012-01-30 18:23 -0800
          Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-30 21:31 -0500
  Re: Java DB rotation Martin Gregorie <martin@address-in-sig.invalid> - 2012-01-31 02:21 +0000
    Re: Java DB rotation Jim Lee <jimlee2907@yahoo.com> - 2012-01-30 18:24 -0800
      Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-30 21:32 -0500
        Re: Java DB rotation Robert Klemme <shortcutter@googlemail.com> - 2012-01-31 08:38 +0100
          Re: Java DB rotation Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-01-31 12:57 -0600
            Re: Java DB rotation Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-01-31 13:03 -0600
              Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-31 20:32 -0500
                Re: Java DB rotation Chris Riesbeck <Chris.Riesbeck@gmail.com> - 2012-02-01 13:49 -0600
                Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-02-01 19:23 -0500
            Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-31 20:31 -0500
          Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-31 20:30 -0500
  Re: Java DB rotation Arne Vajhøj <arne@vajhoej.dk> - 2012-01-30 21:35 -0500
    Re: Java DB rotation Lew <noone@lewscanon.com> - 2012-01-30 22:54 -0800
  Re: Java DB rotation George Neuner <gneuner2@comcast.net> - 2012-02-02 14:05 -0500
  Re: Java DB rotation Rajiv Gupta <rajiv@invalid.com> - 2012-02-08 02:08 +1100

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