RDF/IMP and IMPX System Management Manual (RDF 1.3+)

Preparing the RDF Environment
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
2-7
Specifying SYSGEN Parameters for RDF Data
Blocks
All base tables underlying the views must also reside on volumes protected by RDF on
the primary system.
Partitioned Tables and Files
If any partition of a partitioned SQL/MP table or Enscribe file exists on a volume
protected by RDF, then all partitions for that file need to be on volumes protected by
RDF. All partitions of a file protected by RDF must be on the same system.
Specifying SYSGEN Parameters for RDF Data Blocks
When performing system generation (SYSGEN), you should do as follows:
•
Use the PATHPACKETBYTES modifier to enable the Expand D30 Variable
Packetsize feature so that Expand will send large packets.
•
Use the CONGCTRL modifier to enable Expand congestion control.
•
Use the AUDITTRAILBUFFER parameter to improve RDF extractor performance.
You might also want to enable the multipacket frame feature, depending upon the type
of traffic that will be passed over the Expand path.
For best results, consider using Compaq RDF professional services to assist you in
defining the Expand requirements for your RDF environment. Contact your service
provider for further details.
Designing Transactions for RDF Protection
When designing applications containing transactions that update databases protected by
RDF, you must consider the following restrictions that apply to the subsystem:
•
The effects of network (distributed) transactions after an RDF takeover operation
•
Database operations not replicated by RDF
The subsections that follow explain these restrictions.
Replicating Database Operations
Database administrators preparing to work with RDF should be aware of considerations
concerning:
•
SQL/MP Data Definition Language (DDL) operations
•
Enscribe file-label modifications
•
Purge operations
•
Partitioned files
•
Temporary disk files