Db Data Area Stats Test

All data volumes in a database instance are known collectively as the data area. The data area contains, amongst other things, the application data, the database catalog and the undo log entries of the database instance. This test monitors the usage of the data area.

Target of the test : A MaxDB server

Agent deploying the test : An internal agent

Outputs of the test : One set of results for the MaxDB server being monitored.

Configurable parameters for the test
Parameter	Description
Test Period	How often should the test be executed.
Host	The host name of the server for which the test is to be configured.
Port	The port number to which the server is listening.
DatabaseName	The test connects to a database on MaxDB and extracts performance statistics from the system tables in the database. Therefore, provide the name of a database in the DatabaseName text box.
Username	Since users with the SYSDBA privilege alone are allowed access to system tables, specify the name of such a user against Username.
Password	Provide the Password that corresponds to the specified Username.
Confirm Password	Confirm the password by retyping it here.

Measurements made by the test
Measurement	Description	Measurement Unit	Interpretation
Usable size	Indicates the data area that is currently available for data.	MB	There must also always be sufficient space in the data area to hold all the data that is created during database operations. Therefore, ideally, this value should be high.
Used size	Indicates the memory in data area that is currently used for data.	MB
Data area usage	Indicates the percentage of memory in the data area that is actually used for data.	Percent	Ideally, this value should not be very high.
Data on volume	Indicates the amount of data that has been written to the data area, currently.	MB
Data not on volume	Indicates the amount of permanent data that has to be written to the data area at the next savepoint.	MB	Pagers (which are tasks in the user kernel thread) write the data from the data cache to the data area for each savepoint. If a lot of data was changed and the pagers would have to write many pages at the next savepoint, then the pagers write data from the data cache to the data area before the next savepoint.
Permanent size used	Indicates the data area that is currently used for permanent data.	MB
Temporary size used	Indicates the data area that is currently used for temporary data.	MB	A large proportion of temporary data indicates large amounts of (buffer) result sets. If the value of this measure is high, then find the statement that is causing large amounts of (buffer) result sets to be created, and check the access strategies for this statement.