A database configuration can include any number of forests. The database 
guarantees the ACID properties of the transaction, no matter how many forests 
are configured. You can rely on those ACID properties.

Joins are a different matter: more important for queries rather than updates. 
Joins are possible, but it is optimal to design your most common use-cases so 
that they are not necessary.

-- Mike

> On 27 Aug 2014, at 20:14 , [email protected] wrote:
> 
> Hi All,
>     The forests of marklogic are the real storage places and can work in the 
> different hosts of a cluster. But there is a problem comes that how to 
> guarantee the acid of the transactions when the data are in different 
> forests. For example, there are two forests in different hosts, so there are 
> two different databases based on the forests as on database can only connect 
> with one forest, and the rest server and odbc server must be different, in 
> this case, how to query as sql which contains join as data in different 
> places?
>   Can anyone give me a hand?
> Best regards
> evil  
> 
> [email protected]
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