Hi, all, After I used xwiki for a while with POSTGRES database, I got Exception: Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it since it said " Cannot create PoolableConnectionFactory (FATAL: sorry, too many clients already)", I checked the hibernate.cfg.xml file, I can see the connection.pool_size property is configured with value 2 by default, I have some doubts about this value, only 2 connections in the pool? that is not enough at all, any good reason why the default value is 2? so what is the recommended value? Thanks Dave <property name="connection.provider_class">com.xpn.xwiki.store.DBCPConnectionProvider</property> <property name="connection.pool_size">2</property> <property name="statement_cache.size">2</property> ERROR com.xpn.xwiki.store.DBCPConnectionProvider - Could not create a DBCP pool. There is an error in the hibernate configuration file, please review it. org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (FATAL: sorry, too many clients already) at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549) ~[commons-dbcp-1.3.jar:1.3] at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388) ~[commons-dbcp-1.3.jar:1.3] at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044) ~[commons-dbcp-1.3.jar:1.3] at com.xpn.xwiki.store.DBCPConnectionProvider.configure(DBCPConnectionProvider.java:196) ~[xwiki-platform-legacy-oldcore-3.5.jar:na] at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:143) [hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:84) [hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.cfg.SettingsFactory.createConnectionProvider(SettingsFactory.java:459) [hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:90) [hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2863) [hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2859) [hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1870) [hibernate-core-3.6.9.Final.jar:3.6.9.Final] at nextek.geo.fileupload.MediaViewServlet.doGet(MediaViewServlet.java:57) [geoservice-3.3.jar:na] at javax.servlet.http.HttpServlet.service(HttpServlet.java:621) [servlet-api.jar:na] at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) [servlet-api.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) [catalina.jar:7.0.26] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.26] at com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:68) [xwiki-platform-webdav-server-3.5.jar:na] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243) [catalina.jar:7.0.26] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) [catalina.jar:7.0.26] at org.xwiki.container.servlet.filters.internal.SavedRequestRestorerFilter.doFilter(SavedRequestRestorerFilter.java:217) [xwiki-platform-container-servlet-3.5.jar:na]