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Home » Modeling » EMF "Technology" (Ecore Tools, EMFatic, etc)  » [CDO] Questions about 0.8.0M5
[CDO] Questions about 0.8.0M5 [message #615512] Tue, 19 February 2008 08:58
Stefan Winkler is currently offline Stefan WinklerFriend
Messages: 304
Registered: July 2009
Location: Germany
Senior Member
Hi Eike,

two questions concerning the release notes of your new release.

1. Is HibernateStore ready to use - so could I change from MySql to
Hibernate/MySql? Do I have to provide the mapping or do you generate it
internally?

2. Do I understand savepoints correctly in that they do not write to the
database?

The rationale for 2. is as follows:

As I understand, CDO does not run into an OutOfMemory when I read-access
(iterate) huge models - because the CDOObjects are loaded on demand and
not interconnected.
But when I create huge models, CDO-Objects are not written to the
Database as long as I do not commit().
So when I read a huge data file and create CDO-Objects in one big
transactions, I will encounter an OutOfMemory, because the dirty object
accumulate until I commit.
Leading to question 2 - Savepoints are only in-memory markers of the
last valid state of data - they do not prevent OutOfMemoryErrors in the
case of a huge amount of dirty objects, right?

Cheers,
Stefan
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