Re: [GENERAL] Move rows from one database to other

Am 22.02.2017 um 16:00 schrieb Adrian Klaver:
> On 02/22/2017 04:51 AM, Thomas Güttler wrote:
>>>> I have other concerns: atomar transaction. Movement should happen
>>>> completely or not all.
>>>> I don't think you can do this reliable (atomic transaction) with
>>>> "copy table_name".
>>>
>>> You can if you wrap it in a transaction:
>>
>> I want to **move** the data. The data should get deleted on the
>> satellite after transfer.
>
> Well the replication suggestion is out.
>
>>
>> I don't know how to delete the data which was copied, since inserts can
>> happen during the copy statement.
>
> However you end up doing this I think you will probably need some sort of flag on the rows on the satellites. It
could
> be a timestamp field of when the rows where inserted on the satellite or a boolean field(copied). First instinct is
to
> use an insert timestamp and a tracking table that stores the last timestamp used to move rows, where the timestamp is
> only written on a successful transfer. To improve the chances of successful transfer more smaller transfer batches
> rather then larger transfers.


I really need a solid solution.

You said "... improve the chances of successful transfer ...". This makes me nervous.

Delays are no problems, but data loss or duplication is.

Regards,
   Thomas



--
Thomas Guettler http://www.thomas-guettler.de/