Re: Implementing an Index Access Method in PG 8.4

Ok, thanks so far.
The main question for me now is how to support all the XLog stuff in my own access method. I cannot set it up using the WAL recovery procedure. So, what do I have to insert when doing a XLogInsert for example? I don't know which values to put in there or doesn't it just matter, based on the fact that no recovery will be done at all? How do I register to the XLog component in order to achieve some message that an index recreation has to be done by the user?
Actually, I have looked at the code provided by the backend index methods (like GiST or btree) and copied some of the code and adopted it to my wishes. So, now, I am totally confused how to set up a page properly without knowing how to put data in using XLog components. Could anybody please give me a hint how to achieve this?
Am I able to use the XLog stuff at all?

Best regards
Carsten Kropf
Am 23.02.2010 um 11:21 schrieb Greg Stark:

> On Tue, Feb 23, 2010 at 10:00 AM, Carsten Kropf <ckropf2(at)fh-hof(dot)de> wrote:
>> I have a question according to the implementation of a new index access method in Postgres. Is it necessary to implement a new resource manager for XLog when I am trying to achieve a stable new index access method?
>>
>
> It's not currently possible to register a new recovery manager for a
> module built outside the Postgres source tree. What's happened in the
> past is new index methods weren't recoverable (after a database crash
> indexes had to be rebuilt) but when they were integrated into the
> Postgres source tree adding recoverability was a major piece of that
> integration.
>
> There's been some talk about allowing modules to register new recovery
> managers but in the past it gets stuck on where to store information
> about the recovery manager since the database tables aren't available.
> And on how to guarantee that the backup database and the original
> database have the same idea of which recovery manager is which.
>
> --
> greg
>
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