RDF/IMP, IMPX, and ZLT System Management Manual

Introducing RDF

HP NonStop RDF/IMP, IMPX, and ZLT System Management Manual—524388-002

1-32

Online Product Initialization

You can initialize RDF/IMP, IMPX, or ZLT while your applications continue to run. This

is particularly useful for installing new versions of RDF into existing production

environments where you cannot afford to stop your applications even briefly to

generate a TMF shutdown timestamp. It is also useful if you encounter a problem for

which you would like to reinitialize RDF without stopping your applications.

For information about this capability, see Online Installation and Initialization Without

Stopping TMF, Online Installation and Initialization Without Stopping RDF, and the

INITIALIZE RDF command description.

Online Database Synchronization

With RDF/IMP, IMPX, or ZLT you can synchronize entire databases or selected

volumes, files, tables or even partitions while your applications continue to run. For

information about this capability, see Section 7, Online Database Synchronization.

Online Dumps

With RDF/IMP, IMPX, or ZLT, all backup databases are audited by TMF. You can take

online dumps of a backup database at any time, thereby minimizing the amount of time

necessary to perform any subsequent takeover operation. For information about taking

dumps while the updaters are running, see Section 5, Managing RDF.

Subvolume- and File-Level Replication

By default, RDF provides volume-level protection, wherein changes to all audited files

and tables on each protected primary-system data volume are replicated to an

associated backup-system data volume.

RDF/IMP, IMPX, and ZLT also support subvolume-level and file-level replication. To

use this capability, you supply INCLUDE and EXCLUDE clauses when configuring

updaters to identify specific subvolumes and files you want either replicated or not

replicated.

For information about subvolume-level and file-level replication, see Section 11,

Subvolume- and File-Level Replication.

Shared Access DDL Operations

RDF includes two event messages (905 and 908) that assist you in the proper

performance of NonStop SQL/MP shared access DDL operations on the backup

system. See Performing Shared Access DDL Operations.