Kbase P86545: Which journal receivers must be kept on the AS/400
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
6/30/2004 |
|
Status: Unverified
GOAL:
Which journal receivers must be kept on the AS/400
FACT(s) (Environment):
IBM AS/400 (RISC)
FIX:
1. The journaling on the AS/400 is a commitment control process that is quite similar to after imaging mechanism in Progress.
2. The journal receivers keep track of all the changes to the records in physical file(s). When the journal is started (STRJRNPF) it's possible to specify whether to hold records for rollforward process only (*AFTER) or for rollforward and backout operations (*BOTH)
3. The data stored in the receivers is needed to recover the database files in case of a crash (rollforward and/or rollback).
4. The checkpoint for recovery is the last backup (*LASTSAVE) of the journalled physical file(s).
5. There's no need to keep detached receivers which were handled before saving the database file(s). After a backup (e.g. SAVOBJ) the previous receivers become obsolete.
6. It's crucial for recovery to save receivers only with the changes between the backups.