DB2 Version 9.7 for Linux, UNIX, and Windows
DB2 Version 9.7 for Linux, UNIX, and Windows
Some utilities can be run at the same time as an online backup, but others cannot.
In SMS mode, online index create and online backup will not be compatible due to the ALTER TABLE lock. Online index create acquires it in exclusive mode while online backup acquires it in share.
In DMS mode, online index create and online backup can run concurrently in most cases. There is a possibility if you have a large number of tables in the same tablespace as the one in which you are creating the index, that the online index create will internally acquire an online backup lock that will conflict with any concurrent online backup.
As with online index create, in SMS mode, online index reorganization is not compatible with online backup due to the ALTER TABLE lock. Online index reorganization acquires it in exclusive mode while online backup acquires it in share. In addition, an online index reorganization operation, quiesces the table before the switch phase and acquires a Z lock, which prevents an online backup. However, the ALTER TABLE lock should prevent an online backup from running concurrently before the Z table lock is acquired.
In DMS mode, online index reorganization and online backup can run concurrently.
In addition, online index reorganization quiesces the table before the switch phase and gets a Z lock, which prevents an online backup.
When online backup and rebalancer are running concurrently, online backup will pause the rebalancer and does not wait for it to complete.
The import utility is compatible with online backup except when the IMPORT command is issued with the REPLACE option, in which case, import gets a Z lock on the table and prevents an online backup from running concurrently.
The TRUNCATE statement is not compatible with online backup because it gets a Z lock on the table and prevents an online backup from running concurrently.
ALLOW READ ACCESS load operations are not compatible with online backup when the LOAD command is issued with the COPY NO option. In this mode the utilities both modify the table space state, causing one of the utilities to report an error.
ALLOW READ ACCESS load operations are compatible with online backup when the LOAD command is issued with the COPY YES option, although there might still be some compatibility issues. In SMS mode, the utilities can execute concurrently, but they will hold incompatible table lock modes and consequently might be subject to table lock waits. In DMS mode, the utilities both hold incompatible "Internal-B" (OLB) lock modes and might be subject to waits on that lock. If the utilities execute on the same table space concurrently, the load utility might be forced to wait for the backup utility to complete processing of the table space before the load utility can proceed.
The clean up phase of online table reorganization cannot start while an online backup is running. You can pause the table reorganization, if required, to allow the online backup to finish before resuming the online table reorg.
You can start an online backup of a DMS table space when a table within the same table space is being reorganized online. There might be lock waits associated with the reorganization operation during the truncate phase.
You cannot start an online backup of an SMS table space when a table within the same table space is being reorganized online. Both operations require an exclusive lock.
Online DMS table space backup is compatible with DDLs that require a Z lock.
Online SMS table space backup must wait for the Z lock to be released.
The RUNSTATS command is compatible with online backup except when the system catalog table space is a SMS table space. If the system catalog resides in a SMS table space, then the RUNSTATS command and the online backup will hold incompatible table lock on the table causing lock waits.
Operations that enable or disable autoresize, or alter autoresize containers, are not permitted during an online backup of a table space.
This applies to database-level online backups and table-space-level online backups (if they involve the same table space or table spaces).