# Use cases

The Dataset Attributes Database feature enables scenarios for resource management, such as the following:

- Identify data sets in `Unmovable` status or with excessive CA/CI splits that might affect application performance
- Find large data sets that have a small `Blocksize` value, and reblock them to reduce elapsed time. (The referencing application must support reblocking.)
- Define a situation that raises an alert when the number of extents used by a catalog exceeds a specified value.
- Use the Tivoli® Enterprise Portal to immediately fix a data set problem that you have found, as described in Table 1.

Table 1. Using the Tivoli Enterprise Portal to manage data sets
Phase One: become aware of a problem and decide how to respond | You create a situation to monitor available free space in your storage groups. When the situation fires, you want to find and take action.
Phase Two: identify targets and take corrective action * | Access any row within any TotalStorage® workspace. Click on the Unused column to resort the table by most unused space. Select the candidate data sets, right click, and issue the Release Space action from the Dataset Actions popup menu item. This action initiates a DFDSS RELEASE command for each selected data set.
* The Dataset Attributes Database and Storage Toolkit features that you use in Phase Two replace procedures that require more effort: If you did not have the Dataset Attributes Database feature, you would have to look at a workspace for each volume in the storage group, one at a time. Also, you would have to compile and sort the list of data sets for each volume to determine which ones have the most unallocated space. If you did not have the Storage Toolkit feature, you would have to issue DFDSS RELEASE for each data set individually. See Storage Toolkit.