I had to count the number of connections to the database needed by XWiki to set the appropriate number in the DB configuration. I saw (http://jira.xwiki.org/jira/browse/XWIKI-2332 ) that there is one session factory for every Hibernate Store. After a quick look on the web I understood that a session factory provides one session at a time (basically: if the session is open, then re-use the same session), and the session owns the connexions pool, set to 1 by hibernate.cfg.xml. So I assume I should have one opened connexion for every Hibernate store. According to the initXWiki method from the com.xpn.xwiki.XWiki class, there is 7 stores : - Main store - Attachments store - Versioning store - Attachment versioning store - Recycle bin store - Attachments recycle bin store - Migration store (updating the database after XWiki update). So my question is : Am I right ? Are 7 connexions really enough ? It seems to work, although I didn't tested everything more than seeing pages. Any answer from someone having a better knowledge of XWiki's internal functionment and/or Hibernate would be welcome. All that waiting for the 1.5 version which should allow a shared factory between every store... Thanks a lot, Sebastien Fieux