postgres-xc-developers Mailing List for Postgres-XC

Hi Andrei,

Thank you very much. I understand now.

Regards,
Benny

2011/1/13 Andrei.Martsinchyk <and...@en...>:
> Benny,
>
> OK, the distributed constraint restriction still in force.
> Partitioning of master and slave tables should guarantee that if
> master record ever presents in the table it must be on the same data
> node as the slave record. Constraint checker only sees local data
> node, it can not look up other datanodes.
>
> 2011/1/13 xiong wang <wan...@gm...>:
>> Hi,
>> I am sorry that I took a wrong case as an example.
>> The right example is like:
>> postgres=# create table xyz(x int, y int, foreign key(y) references
>> shench(a)) distribute by hash(x);//not by hash(a)
>> ERROR:  Hash distributed table must include distribution column in index
>>
>> My question is why hash distributed key "x" must be included in foreign keys.
>>
>> Many thanks for your reply.
>>
>> Regards,
>> Benny
>>
>> 2011/1/13 Andrei.Martsinchyk <and...@en...>:
>>> Benny,
>>>
>>> The column specified in hash() clause must be from table being
>>> created. The specified (a) column is from other table. It looks like
>>> it just output incorrect error message.
>>> The note about distributed constraint is correct.
>>> In your example one of two conditions must be met:
>>> Table xyz must be hash distributed by y AND shench table must be hash
>>> distributed by a AND columns y and a must be of the same data type;
>>> or
>>> shench table must be replicated.
>>>
>>> 2011/1/13 Koichi Suzuki <ko...@in...>:
>>>> Unfortunately, reference integrity is not fully supported by XC yet,
>>>> because we have to check existing of the matching rows in different data
>>>> nodes, which is not simple, as in the case of global unique constraint
>>>> for non-distribution columns.
>>>>
>>>> So I think this is one of the issue we have.
>>>>
>>>> Any further thoughts?
>>>>
>>>> ---
>>>> Koichi
>>>>
>>>> (2011年01月13日 15:53), xiong wang wrote:
>>>>> Dears,
>>>>>
>>>>> When We are fixing the bug relative with the foreign key, there is
>>>>> something we are confused. The problem as follows:
>>>>> postgres=# create table xyz(x int, y int, foreign key(y) references
>>>>> shench(a)) distribute by hash(a);
>>>>> ERROR:  Hash distributed table must include distribution column in index
>>>>>
>>>>> I don't know why Hash distributed column must be included in foreign
>>>>> constraint. Could you explain something?
>>>>>
>>>>> Thanks a lot.
>>>>>
>>>>> Regards,
>>>>> Benny
>>>>>
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>>> --
>>> Andrei Martsinchyk
>>>
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>
>
>
> --
> Andrei Martsinchyk
>
> EntepriseDB Corporation
> The Enterprise Postgres Company
>
> Website: www.enterprisedb.com
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