TMF Application Programmer's Guide (G06.26+)

TMF ARLIB2 Audit-Reading Procedures

HP NonStop TMF Application Programmer’s Guide—522419-005

5-15

Auxiliary Audit Trails

Although most applications use only a master audit trail, the TMF audit-reading

procedures support both master and auxiliary audit trails. The following types of audit

records can appear in either the master audit trail or an auxiliary audit trail:

All other types of audit records can appear only in the master audit trail.

Tracing transactions that involve volumes whose audit records are directed to an

auxiliary audit trail can be difficult. There is no indication within the master audit trail

that a transaction also involves an auxiliary audit trail. If you are tracing a transaction

that involves auxiliary audit trails, you will have to search every trail that includes the

transaction and correlate the audit records by using the transid.

Subset Audit Records

When several records within the same data block are all deleted or updated in

the same manner, the disk process generates a single audit record containing the

before-images and after-images of all of the affected data records. Each delete or

update represented within such an audit record is called a “subset audit record.”

The use of subset audit records has the following consequences:

•

The SEQNO and RBA values returned by ARREAD are the same for all related

subset audit records.

•

If you try to position the cursor at a particular subset audit record, the cursor

actually gets positioned at the beginning of the entire audit record (or at the end if

you are reading in the reverse direction).

delete file purge update

file alter file

rename

update

auditcomp

file

create

insert update fieldcomp