user timeout session management generating a SessionExpiredException in order to show the session checker dialog and redirect to login. Class StatisticalManagerException created in order to manage exceptions generated from the statistical caching on sampling, smartSampling and submitQuery requests added. bug fixed in servlet in sbmitQuery method generated when a map is retrieved from a statisticalmanager and a user clicks cancel button. data refresh added for sampling, smartSampling and submitQuery operations. cache name changed in DBCache. batch processing (thread) added to recover all data in the tree and the tables list. data cached adding in a key the scope within a user uses the portlet. data refresh improved in the tree panel in order to implement the cascade refresh using a thread.Queue mechanism added to make asynchronous the communication with the ThreadDataLoader. For the functionality of TablesList the "canc" button of the window that displays the tables list has been removed and has been added icon at the top of the window (as well as in submitQuery and Samplings dialogs). In addition, on top of the window has been also removed icon that minimizes window and has been added icon that maximizes the window. bug fixed in class GxtBorderLayout in order to manage the copy of grid elements correctly. An element copy has been managed setting a grid property named disbleTextSelection and not through the double click and the edit event. counter added in order to count the cache hit number and the satistical manager computation number, the cache query sampling hit number and the satistical manager query sampling computation number to perform statistics about the effectiveness of the cache. for submitQuery operation attributes names added in the csv file. bug fixed for the submit query operation if at the same time a refresh query operation is performed. GWTdbManagerServiceImpl and GxtBorderLayput classes modified. top header in the portlet made invisible. GxtBorderLayout class modified. samplings operations, show create table and table details made available. Interface enhancement first release