eG Monitoring
 

Measures reported by OraRacTmpTabTest

A temporary tablespace, contrary to what the name might indicate, does exist on a permanent basis as do other tablespaces, such as the System and Sysaux tablespaces. However the data in a temporary tablespace is of a temporary nature, which persists only for the length of a user session. Oracle uses temporary tablespaces as work areas for tasks such as sort operations for users and sorting during index creation. Oracle does not allow users to create objects in a temporary tablespace. By definintion, the temporary tablespace holds data only for the duration of the user's session, and the data can be shared by all users.

Sufficient free space should be available in the temporary tablespace, as critical operations such as sorting and execution of hash-intensive queries may otherwise fail. Periodically checking the space usage in the temporary tablespaces will provide you with early warning signals of potential space contentions.

This test monitors the usage of the temporary tablespace in each instance of the Oracle RAC, and proactively reports which temporary tablespace is running dangerously low on free space. Moreover, the test also reports the usage of the temporary tablespace across instances.

The measures made by this test are as follows:

Measurement Description Measurement Unit Interpretation
Used_space Indicates the space that is already used by this temporary tablespace. MB If this value is very high, then it indicates that the memory of this tablespace is almost full.
Free_space Indicates the amount of unused space in this temporary tablespace. MB If this value is very low, then it indicates over-utilization of the tablespace.
Total_space Indicates the total amount of space allocated for this temporary tablespace. MB  
Max_bytes Indicates the maximum extent upto which this temporary tablespace can grow. MB  
Used_percentage Indicates the percentage of space used by this temporary tablespace. Percentage If this value is high, then it indicates over-utilization of the tablespace.
Free_percentage Indicates the space available for overall growth expressed as a ratio of Free_space with respect to the Max_bytes of this temporary tablespace. The formula used is: Free_space/Max_bytes*100 Percentage If this value is very low, then it indicates that more space needs to be allotted to this tablespace to ensure that critical operations do not fail.