Single-datasource mode to work without XA

To activate single-datasource mode (which is the default since Nuxeo 5.7.1), define the variable: nuxeo.db.singleDataSource=jdbc/NuxeoDS By default this is defined from templates/common-base/nuxeo.defaults. To disable it (which you MUST DO if you use several repositories), just use:     nuxeo.db.singleDataSource= The datasource name can of course be different than jdbc/NuxeoDS, but it must be a valid datasource already defined elsewhere. In addition, the maximum pool size for the datasource must be enough for all the VCS connections, which means that you must have nuxeo.db.max-pool-size ≥ nuxeo.vcs.max-pool-size + 2 (The + 2 comes from two reserved connections for the VCS lock manager and the cluster node handler.) As an advanced feature, if you want single-datasource mode except for some specific datasources (that need to hit a separate database for instance), then you can use: nuxeo.db.singleDataSource.exclude=jdbc/mydatasource, jdbc/otherdatasource NOTE HOWEVER that these datasources will not participate in any global XA transaction so there will be no two-phase commit for them and on error and rollback (which should not happen) they may become inconsistent. Non-standard code wishing to use this feature should use the ConnectionHelper.getConnection() API.