Prerequisites and Must know Configure or integrate Online Database backup with IBM DB2 Universal Database Server (DB2 Server)

DB2 UDB integration

 Below details are captured as per Data Protector backup tool:

Data Protector integrates with IBM DB2 Universal Database Server (DB2 Server) to back up DB2 database objects online and offline.

Available Backup Types: Full, Incremental, Delta

The basic backup unit is a table space. Only table spaces or databases (DB2 objects) can be selected for backup.

Prerequisites:

• For rollforward recovery, and setting the logarchmeth1 to either User Exit or Vendor, first back up the database offline.
• db2arch: Program that backs up and restores DB2 log files when DB2 log archive method (logarchmeth1) is set to user exit
• libob2db2: Data transferring (database backup and restore, log archive/retrieval when logarchmeth1 is set to vendor) module called by DB2 Server.
• Ensure the DB2 user has appropriate authorities to perform DB2 backups and restores (either SYSADM, SYSCTRL, or SYSMAINT).
• Required components to configure backup:

1. Instance Name
2. OS User Name and Group/Domain
3. DB2 User and Password
4. DB2 instance home directory (only in a partitioned environment)

• Add user root (UNIX only) and the DB2 user to both the Data Protector and DB2 admin user groups.
• Provide this user in configuration and restore procedures. This user is needed by Data Protector to start the Data Protector Inet service (Windows) or process (UNIX).

Considerations:

1. HPE recommends that you set the log archive method (logarchmeth1) to Vendor, because IBM DB2 has deprecated the UserExit option from the DB2 version 9.5.

2. If your existing database has the log archive method set to UserExit and you want to change it to Vendor, then the database recovery for the log that is backed up using the User Exit option can be done using the below steps:

o    Restore the database (without enabling the Roll forward recovery in the Data Protector GUI).

o    Restore the logs that were backed up using the User Exit program in the active log directory.

3. Set the environment variables in the omnirc file before restoring to a DB2 database using the automatic Roll forward:

On the DB2 client, set the following environment variables in the omnirc file:

o    OB2APPNAME= “source_Instance_name”

o    OB2BARHOSTNAME=”Source_client_name”

o    OB2APPDATABASE= “source_database_name”

Note: This is valid for all DB2 log backups using the Vendor library and not required for the User-Exit mode.

In the omnirc file, delete the above mentioned three variables after the Roll forward of the DB2 database.

CLI: Commandline Help

1. Run the command

util_db2 –CONFIG DB2_instance username password [DB2 _instance_home]

          The message “*RETVAL* 0” indicates successful configuration

2. Run the command to Check the configuration status after creating backup

util_db2.exe –CHKCONF DB2_instance

Restore:

1.    Data Protector currently does not support restore of DB2 objects using DB2 CLI. You must only use Data Protector GUI or CLI to complete these steps.

2.    Databases are restored offline.

3.    Table spaces are restored online. Only table spaces that are not being restored are available for use.

4.    A dropped table space can only be restored from a full database backup.

5.    For rollforward recovery, the latest backup version of log files is used. To perform a rollforward recovery using an older version of log files, first restore the desired log files and then restore the databases/tablespaces with the Rollforward option cleared. In a partitioned environment, connect to the catalog node. Finally, perform a rollforward recovery using DB2 tools.

Restore Types:

When restoring a database or table space, you can specify restore options to perform:

• Rollforward recovery
• Version recovery
• Restore to a new database (database only)
• Restore to another instance (database only)
• Restore to another system (database only)
• Automatic restore from incremental or delta backups

Databases are restored offline, table spaces online

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