Implement pre-ODS 12 provider
-----------------------------

                 Key: CORE-5003
                 URL: http://tracker.firebirdsql.org/browse/CORE-5003
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
    Affects Versions: 3.0 RC 1
            Reporter: michalk1


As I read in Firebird 3.0 RC1 Release Notes, FB 3.0 doesn't include pre-ODS 12 
provider, and it may only be implemented in future. Please reconsider this, I 
think that it's quite important to have providers for one or two previous FB 
versions, especially to simplify the upgrade process. Without them, unlike 
previous major upgrades, upgrade to FB 3 would require to go the classical hard 
way - backup all databases first under previous FB version, uninstall old 
Firebird, install Firebird 3, and restore the backups. While this is trivial 
task for an in-house database administrator, it's quite difficult to achieve 
automatically by installation process at customers' sites, without user's 
intervention. I think that FB should allow easier upgrade path and be able to 
read older versions databases. Full feature work with older ODS may not be 
necessary, but new Firebird version should at least be able to make backup of 
the older ODS databases on its own, just as previous FB versions did
 .

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