Hi Christian,

Thanks for the quick answer.

Defining the operations in a single query would be preferable but isn't
possible, since the read operation is simply triggered by a website
visitor, and the creation of the new DB (indeed overwriting the old DB
with db:create) is performed by an action of the CMS admin.

So, these operations can happen at the exact same moment. The
inconvenience at the front-end will be minimal, I'm just wondering if
these concurrent operations can cause problems with BaseX or the
db:create operation.

best,
Marc

On Wed, 8 Aug 2018, Christian Grün wrote:

> Hi Marc,
>
> As one XQuery expression is one transaction, the best approach is to
> define your operations in a single query. If you call db:create, an
> existing database will be overwritten, and the function allows you to
> specify some initial input.
>
> Hope this helps,
> Christian
>
>
>
> On Wed, Aug 8, 2018 at 10:31 PM Marc Coenegracht <marc@crosseyed.nl> wrote:
>>
>> Hi,
>>
>> A CMS occasionally recreates some existing databases of a production site.
>> The databases are deleted and again created with the new content within
>> a few seconds.
>>
>> What happens if a read operation is taking place during this process? Can
>> it cause problems with the recreation of the DB or with the BaseX server
>> instance?
>>
>> Of course it is possible to update the databases instead, but this process
>> is a lot simpler and probably faster too.
>>
>> All operations are executed running xquery scripts with REST using the
>> BaseX http server.
>>
>>
>> Marc
>