HP 3000 Manuals HP 3000 Manuals
Closing the Database or a Data Set After you have completed all the tasks with the database, use the DBCLOSE library procedure to terminate access to the database. When DBCLOSE is used for this purpose, all data sets and the root file are closed, and the DBU control block is released to the MPE/iX system. If there are no other concurrent users of the database, the DBB and DBG control blocks are also released. All locks that you could still have on the database through the closed access path are automatically released. The DBCLOSE procedure can also be used to rewind or close access to a data set. Rewinding consists of resetting to its initial state the dynamic status information kept by TurboIMAGE/XL. If a detail data set is closed or rewound, the current path does not change when the status information is initialized. The purpose of closing a data set completely is to return the resources required by that data set to the MPE/iX system without terminating access to the database. A typical reason for rewinding a data set is to start at the first or last entry again when doing a forward or backward serial read.