This is a database-level metric. For cluster databases, this metric is monitored at the cluster database target level and not by member instances.
The allocated space of a tablespace is the sum of the current size of its data files. A portion of this allocated space is used to store data while some may be free space. If segments are added to a tablespace, or if existing segments grow, they will use the allocated free space. The allocated free space is only available to segments within the tablespace. If, over time, the segments within a tablespace are not using this free space, the allocated free space is not being used.
This metric calculates the space allocated for each tablespace. It is not intended to generate alerts. Rather it should be used in conjunction with the Allocated Space Used (MB) metric to produce a historical view of the amount of space being used and unused by each tablespace.
The rest of the information in this section is only valid for this metric when it appears in either the Enterprise Manager Grid Control or the Enterprise Manager Database Control (if applicable).
The following table shows how often the metric's value is collected.
Every 7 Hours
Tablespace Allocated Space (MB) is calculated by looping though the tablespace’s data files and totalling the size of the data files.
Specific to your site.
About the Metric Detail Page
Understanding Line Charts
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