Home » IBM » C9060-518 » What is the maximum number of parallel streams that an IBM Tivoli Storage Manager (TSM) Database backup can produce?
What is the maximum number of parallel streams that an IBM Tivoli Storage Manager (TSM) Database backup can produce?
A. 12
B. 8
C. 10
D. 4
Correct Answer: D
Explanation/Reference:
Explanation:
NUMStreams
Specifies the number of parallel data movement streams to use when you back up the database. The minimum value is 1, and the maximum value is 4. Increasing the value causes a corresponding increase in the number of database backup sessions to be used and the number of drives to be used for the device class. If you specify a NUMSTREAMS value in the BACKUP DB command, it overrides any value that is set in the SET DBRECOVERY command. Otherwise, the value that is set in the SET DBRECOVERY command is used. The NUMSTREAMS value is used for all types of database backups.
If a value is specified that is greater than the number of drives available for the device class, only the number of available drives are used. The available drives are those defined to the device class by the MOUNTLIMIT parameter or by the number of online drives for the specified device class. The session is displayed in the QUERY SESSION output.
If you increase the number of streams, more volumes are used from the corresponding device class for this operation. Using more volumes might improve the speed of the database backups, but at the cost of more volumes that are not fully used.
Reference: https://www-01.ibm.com/support/knowledgecenter/SSGSG7_7.1.3/srv.reference/r_cmd_db_backup.html
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