Hi Florent,
Florent André schrieb:
Hi Andreas, hi all
You said :
On Wed, 12 Aug 2009 12:03:16 +0200, Andreas Hartmann <[email protected]>
wrote:
IMO the only reason for storing multiple content items in a single
document is the limited scalability of the sitetree, but this should
only be noticeable when there are several 10.000 or 100.000 documents.
There is a not little difference between 10.000 and 100.000 documents... :)
There is any information on the max number of document that can be deal ?
I think the only hard limit is the amount of RAM that's available to the
JVM. There is a performance degradation when the sitetree is handled,
but I think it's pretty much linear.
What kind of problems can occur (difficult copy/past, time to access, loss
of data,...) ?
Loss of data should not be an issue, since the complete sitetree is
locked in each transaction it is involved in.
The most significant issue is the performance degradation. Because the
sitetree is stored in a single file and there is no session
synchronization mechanism, it has to be parsed after each change. So if
you have a large sitetree and someone inserts a document or changes a
navigation title, the next request will be slower. There is a single
sitetree object with some indexes for faster node lookup that is shared
by all read-only sessions, so when no changes are made the system should
be pretty fast even when there are lots of documents. Maybe someone
would like to run some benchmarks?
If someone still uses the old navigation framework from the sitetree
module instead of the new navigation module, there will be a performance
degradation with large sitetrees. This should not be an issue with the
new navigation module.
When you say "there are several 10.000 or 100.000 documents", this is for
each publication or for the all Lenya instance ?
That's for each publication, or rather each area, since the sitetree is
stored per area. So you could mitigate the effects by distributing your
documents across multiple publication. I think it's possible to store
huge amounts of documents when you use many publications.
-- Andreas
--
Andreas Hartmann, CTO
BeCompany GmbH
http://www.becompany.ch
Tel.: +41 (0) 43 818 57 01
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