[postgis-users] dblink experiences? multiple geom copies in multiple databases

Paul Ramsey pramsey at refractions.net
Mon Aug 13 12:16:17 PDT 2007


It just makes creating new databases with spatial enabled possible  
from the SQL command line:

CREATE DATABASE newdb WITH TEMPLATE=template_postgis;

P

On 13-Aug-07, at 11:59 AM, John Smith wrote:

> interesting.
>
> i also see a postgis template database. does that only help to
> spatially enable new databases (likely) or also help spatial queries
> from other databases (not likely, but if so, how is this
> inter-database querying happening)?
> jzs
>
> On 8/13/07, Paul Ramsey <pramsey at refractions.net> wrote:
>> Correct, that's how most do it. dblink is an option, but I have no
>> experience to share on that. Just from a straight design PoV though,
>> the complete opacity of a dblink table in terms of size, selectivity,
>> indexes, etc, means that you'll have to be pretty careful about what
>> use cases you try and push through that pipe -- it's not a
>> transparent gateway, it's more of a straw.
>>
>> P
>>
>> On 13-Aug-07, at 7:02 AM, John Smith wrote:
>>
>>> given this:
>>> - cluster
>>> -- database
>>> --- schema (except public schema can be accessed from outside)
>>> ---- table, function etc
>>> it means (and i didn't want to accept this conclusion) most postgis
>>> shops have 1 kick-ass database for all their geom and related non- 
>>> geom
>>> tables separated by named schemas. users, permissions etc are all
>>> restricted by these named schemas and *all* geom tables are  
>>> contained
>>> in this monster database (to avoid duplication).
>>>
>>> well that'll certainly ease administration :).
>>>
>>> On 8/11/07, Paul Ramsey <pramsey at refractions.net> wrote:
>>>> In what respect do you find that postgis doesn't support multiple
>>>> schemas?  We generally install postgis in 'public.' and create lots
>>> http://postgis.refractions.net/pipermail/postgis-users/2006-January/
>>> 010602.html
>>> jzs
>>>
>>> On 8/11/07, Paul Ramsey <pramsey at refractions.net> wrote:
>>>>
>>>> On 10-Aug-07, at 2:05 PM, John Smith wrote:
>>>>
>>>>> postgresql doesn't support queries across multiple databases and
>>>>> postgis doesn't support multiple schemas, so how'd you guys do  
>>>>> it?\\
>>>>
>>>> In what respect do you find that postgis doesn't support multiple
>>>> schemas?  We generally install postgis in 'public.' and create lots
>>>> of other schemas ('foo.', 'water.', 'etc.') for our data tables.
>>>>
>>>> P
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