Database migration in Base

Kaganski Mike mikekaganski at
Wed Apr 11 08:49:24 UTC 2018


On 4/11/2018 10:46 AM, Jean-Pierre Ledure wrote:
> Le 10/04/18 à 22:36, Wols Lists a écrit :
>> On 10/04/18 16:55, Jean-Pierre Ledure wrote:
>>> Does this mean that once a .odb file containing an embedded HSQLDB
>>> database is opened in LO 6.1 there is no way back ? That file cannot be
>>> accessed anymore by a LO <= 6.0 user ? Is this acceptable ?
>> It's normal to update the on-disk format, with the inevitable consequence
>> that old versions of the program cannot access newer versions of data.
> When the database conversion is automatic without a fault back scenario, 
> then the software has at least to *GUARANTEE* that there will be neither 
> data loss nor functional loss afterwards.

Well - the "*GUARANTEE*" part sounds ... funny (even comparing with 
"guarantee" level offered by paid support from some industry-leading 
corporations); but there's a point: I don't know how is it implemented 
now, but I see how a user might be concerned when one opens one's DB 
with a newer SW and gets a converted data without warnings or backups. 
So we should actually provide either one or the other. Id doesn't matter 
if one wants "guarantees"; but it does if one gets unexpected 
incompatibilities - e.g., one may work with one's data using different 
software on different occasions, etc.

Best regards,
Mike Kaganski

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