Yep no probs at all. You can have multiple databases open at the same
time and open and close them on different threads as you like.
You'll just need to do the appropriate connection handling linked to the
session open / close.
Scaling is going to depend on your application architecture too. If you
are horizontally scaling it isn't going to work with embedded
databases?. Or are you using TCP and having a h2 server on a different
server?
The downside I can think of is that you can't query all databases for
any non-user tasks. Have to update all schemas individually, etc. So on
each session start it is going to almost be like starting a separate
application.
Probably fits quite nicely with vaadin architecture. Just link it to the
Application start and end (Don't they call a session an application?)
Ryan
On 2/07/2015 6:06 AM, Basil Bourque wrote:
Is it possible to start up and shut down multiple H2
<http://h2database.com/html/main.html> databases within a JVM?
My goal is to support multi-tenancy
<https://en.m.wikipedia.org/wiki/Multitenancy> by giving each
user/account their own database. Each account has very little data.
Data between the accounts is never accessed together, compared, or
grouped; each account is entirely separate from the others. Each
account is only accessed briefly once a day or a few times a month. So
there are few upsides to housing the data together in a single
database, and some serious downsides.
So my idea is that when a user logs in for a particular account, that
account’s database is loaded. When that user logs out, or their web
app session (Vaadin <https://www.vaadin.com/> app) times out, that
account’s database is closed, it's data flushed to storage, and
possibly a backup performed. This opening and closing would be
happening for any number of databases in parallel.
Benefits include minimizing the amount of memory in use at any one
time for caching data and indexes, minimizing locking and other
contention, and allowing for smooth scaling.
I'm new to H2, so I'm not sure if its architecture can support this.
I'm asking for a denial or confirmation of this capability, along with
any tips or caveats.
----
Taken from my Question <http://stackoverflow.com/q/31150193/642706> on
StackOverflow.com.
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