Re: [HACKERS] proposal: session server side variables - Mailing list pgsql-hackers

From Fabien COELHO
Subject Re: [HACKERS] proposal: session server side variables
Date
Msg-id alpine.DEB.2.20.1701021646570.26374@lancre
Whole thread Raw
In response to Re: [HACKERS] proposal: session server side variables  (Pavel Stehule <pavel.stehule@gmail.com>)
Responses Re: [HACKERS] proposal: session server side variables  (Pavel Stehule <pavel.stehule@gmail.com>)
List pgsql-hackers
Hello,

>>> In my proposal was support for transaction scope - ON COMMIT RESET 
>>> clause should be ok
>>
>> Could you update the wiki, both the proposal and the use-case
>> implementation, to reflect this point?
>>
>> Moreover, is there any actual use-case for non-transactional secure
>> half-persistent session variables? AFAICS the "secure" part implies both
>> permissions and transactional for the presented security-related use case.
>> If there is no use case for these combined features, then ISTM that you
>> should update to proposal so that the variables are always transactional,
>> which is both simpler, more consistent, and I think more acceptable.
>
> If you are transaction sensitive, then you have to be sensitive to
> subtransactions - then the work is much more complex.

Maybe, probably, I do not really know. For now, I'm trying to determine 
how the proposals fits Craig's use case.

The current status is that both proposals are useless because the use case 
needs "some" transactional property for security. But probably some 
improvements are possible.

> Is there use case, when you would to play with transactions and variables
> and RESET is not enough?

I do not know. If you explain more clearly what is meant by a "RESET" on a 
variable when the transaction fails, then maybe I can have an opinion. 
Currently I'm just guessing in the dark the precise intended semantics.

-- 
Fabien.



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