As segments within a tablespace grow, the available free space decreases. If there is no longer any available free space, meaning datafiles have hit their maximum size or there is no more disk space, then the creation of new segments or the extension of existing segments will fail.
This metric checks for the total available free space in each tablespace. This metric is intended for larger tablespaces, where the Available Space Used (%) metric is less meaningful. If the available free space falls below the size specified in the threshold arguments, then a warning or critical alert is generated.
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 and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
|
Target Version |
Evaluation and Collection Frequency |
Upload Frequency |
Operator |
Default Warning Threshold |
Default Critical Threshold |
Consecutive Number of Occurrences Preceding Notification |
Alert Text |
|
10.1.0.x; 10.2.0.x; 11.1.0.x; 11.2.0.x |
Every 30 Minutes |
After Every Sample |
<= |
Not Defined |
Not Defined |
1 |
Tablespace [%name%] has [%value% mbytes] free |
For this metric you can set different warning and critical threshold values for each "Tablespace Name" object.
If warning or critical threshold values are currently set for any "Tablespace Name" object, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each "Tablespace Name" object, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
MaximumSize - Total Used Space where:
TotalUsedSpace: total used space in MB of tablespace
MaximumSize: Maximum size (in MB) of the tablespace. The maximum size is determined by looping through the tablespace's data files, as well as additional free space on the disk that would be available for the tablespace should a data file autoextend.
Perform one of the following:
Increase the size of the tablespace by: Enabling automatic extension for one of its existing data files, Manually resizing one of its existing data files, or adding a new data file.
If the tablespace is suffering from tablespace free space fragmentation problems, consider reorganizing the entire tablespace.
Relocate segments to another tablespace, thus increasing the free space in this tablespace.
Run the Segment Advisor on the tablespace.
Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
Understanding Line Charts
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