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Administrator's Reference

DEFINE DBCOPY (Define a Volume Copy of a Database Volume)

Use this command to create a copy (mirrored volume) of a database volume. Mirroring the database increases database availability and provides a safeguard against media failure. You can have as many as two copies of a database volume. After each database volume copy is defined, the server attempts to synchronize the volume copy with the database.

All database volumes reside on a random access volume. Volume copies must have at least the same capacity as the original volume and should be defined on separate physical devices. Any additional space on the volume copy is not used.

This command generates a background process that you can cancel with the CANCEL PROCESS command. If a DEFINE DBCOPY process is canceled, the volume copy is created. However, synchronization processing is canceled, leaving the volume in a stale state. To display information on background processes, use the QUERY PROCESS command.

Privilege Class

To issue this command, you must have system privilege or unrestricted storage privilege.

Syntax

>>-DEFine DBCopy--volume_name--copy_volume_name----------------><
 
 

Parameters

volume_name (Required)
Specifies the name of the database volume to be mirrored.

copy_volume_name (Required)
Specifies the file name of the volume copy.The name cannot contain embedded blanks or equal signs. For VSAM linear data sets, specify a standard VSAM cluster name. A VSAM cluster name consists of one or more qualifiers, which are delimited by periods. The length of each qualifier is from 1 to 8 alphanumeric characters. The maximum length of the cluster name is 42 characters. An example is ADSM.BFS.POOL2.VOLA.
Note:
The server does not support VSAM Extended Format Linear Datasets. The server supports VSAM Linear Datasets that have been defined at 4GB or less.

Examples

Task

Create a database volume copy named GLEDDIE.TIVSM.PINV for the database volume named HARVEY.TIVSM.PINV.

Command:
define dbcopy harvey.tivsm.pinv gleddie.tivsm.pinv

Related Commands

Table 42. Commands Related to DEFINE DBCOPY

Command Description
CANCEL PROCESS Cancels a background server process.
DEFINE DBVOLUME Assigns a volume to be used for database storage.
DELETE DBVOLUME Deletes a volume from the database.
QUERY DBVOLUME Displays information database volumes.
QUERY PROCESS Displays information about background processes.


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