Multiple Databases (MDBs)

Administrator User Guide

Creating the Main Admin Elements : Multiple Databases (MDBs)

To create an MDB, set the Elements option list on the Admin elements form to MDBs, and click Create. The Create Multiple Database form will be displayed.

The Create Multiple Database form allows you to give the MDB a Name and a Description.

The scrolling lists are used to define the databases in the MDB, and whether they are current or deferred.

A MDB can contain up to 1000 DBs, and any number of the 1000 DBs can be described as current and accessed at one time. The other databases are deferred. Databases can be transferred between current and deferred status at any time, so that a user can replace a current database by a non-current one to access a particular part of the design.

The Project Databases list shows all the databases in the project which are not in the MDB. The arrow buttons are used to add and remove databases from the MDB, either as current or deferred, and to change a database between the current and deferred lists. The Insert option button is used to position the databases in a specified order in the list of current databases. The order is important: refer to Multiple Databases (MDBs).

Note:

Two databases will have the same DBNO if one has been created as a copy or as an extract. An MDB can only contain one database with a given DBNO.

Note:

There can be a performance issue with large lists of databases. However this can be improved using the Rebuild Lists On/Off toggle. If this toggle is switched Off then the lists are not rebuilt each time a database is moved; only when using the Apply or the Now button. The default, however, is On. The picking order of databases is relevant, where databases will be added or exchanged in accordance with the pick order.