Hi,
I am not sure if this is the place to ask this question, but since the question is trying to improve the performance.. i guess i am not that far off.
My question is if there is a query design that would query multiple server simultaneously.. would that improve the performance?
To make it clear.. let's say we have 3 db servers. 1 server is just designed to take the queries while the other 2 server is the ones that actually
holds the data. let's say we have a query of 'select * from customer_data' and we change it to
select * from
(
dblink('db1','select * from customer_data where timestamp between timestamp \'01-01-2004\' and timestamp \'06-30-2004\'')
union
dblink('db2','select * from customer_data where timestamp between timestamp \'01-07-2004\' and timestamp \'12-31-2004\'')
)
Would the subquery above be done simultaneously by postgres before doing the end query? or would it just execute one at a time?
If it does execute simultaneously.. it's possible to create code to convert normal queries to distributed queries and requesting data from multiple
database to improve performance. This would be advantageous for large amount of data.
Thanks,
Hasnul
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