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List:       postgresql-general
Subject:    Re: [HACKERS] 2PC transaction id
From:       Dave Cramer <pg () fastcrypt ! com>
Date:       2005-06-30 23:47:39
Message-ID: D701313E-CFF8-4FAE-A699-D107EF6308D9 () fastcrypt ! com
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I'm thinking of the situation where one transaction occurs on more  
than one backend, and there is
more than one transaction manager.

Dave
On 30-Jun-05, at 7:37 PM, Oliver Jowett wrote:

> Dave Cramer wrote:
>
>> Do the transaction id's used in 2PC need to be unique across all   
>> sessions?
>>
>
> They are global IDs, yes.
>
>
>> Do we provide a mechanism for this ?
>>
>> If not shouldn't we provide a way to create a unique transaction id ?
>>
>
> Well, in XA the XIDs are assigned by the TM, the individual resources
> (e.g. a postgresql backend) just get *given* an XID to use.
>
> -O
>
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