Re: Difference between UDR and BDR replication

On 28 January 2016 at 21:16, Kaushal Shriyan <kaushalshriyan(at)gmail(dot)com>
wrote:

>
>
> On Thu, Jan 28, 2016 at 6:32 PM, Craig Ringer <craig(at)2ndquadrant(dot)com>
> wrote:
>
>> On 28 January 2016 at 19:16, Kaushal Shriyan <kaushalshriyan(at)gmail(dot)com>
>> wrote:
>>
>>> Hi,
>>>
>>> Can somebody please help me understand the difference between UDR and
>>> BDR with examples?
>>>
>>
>>
>> BDR is for multiple masters that all replicate to each other.
>>
>> UDR takes data from one server and copies it to another. One way. (By the
>> way, I strongly advise you to now use pglogical instead of UDR).
>>
>> BDR:
>>
>> A <==> B
>>
>> UDR/pglogical:
>>
>> A ==> B
>>
>
> Hi Craig,
>
> Thanks for the explanation. Does it mean UDR is Master to Slave
> replication?
>
>
Correct. Please use either PostgreSQL's built-in streaming replication
features or pglogical instead, though. If you're not sure which, use the
built-in replication features.

--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services