This tutorial explains how to work with ODB in Metview.
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Right-click on your 'CCMA.obs' ODB Database icon and select examine from the icon menu. This will start the ODB Examiner application that displays the meta-data of the database. By default you should see the Tables tab of the interface showing the ODB table hierarchy. This hierarchy only exists only for the ODB-1 format (so we can see that our 'CCMA.obs' icon represents an ODB-1 database). By clicking on a table name the columns belonging to the selected table are displayed in the right hand side of the interface. There are two more tabs in the interface: the Columns tab showing the list of all the available columns and the SET Variables tab providing the users with the list of pre-defined ODB variables. Explore these tabs and then close the ODB Examiner.
Now right click and examine icon 'AMSUA.odb'. It points to an ODB database (just like icon 'AIREP.odb'). Since there is no table hierarchy to be shown the list of all the available columns is displayed by default (Columns tab).
The data values stored in the ODB can be also inspected in the ODB Examiner (this feature does not work for ODB-1). Just click on the Data tab to see the data values. If there are too many values to be shown the ODB Examiner displays the data items in blocks. The actual size of the data blocks (in terms of rows) can be seen at the bottom of the interface next to the data block navigation buttons. Data blocks were introduced to reduce memory usage since the ODB Examiner has to keep in memory all the values shown in the Data tab.
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Each column in the Data tab can be sorted by clicking on the column heading. However, please note that sorting is enabled only if all the available data values can be displayed at once, i.e. no data blocks are to be used. By default the ODB Examiner starts splitting the data into data blocks if more than 60 MB is needed to store the data values in memory. You can override this default value in the Configure dialog available from the Settings menu in the menu bar.
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