Kbase 13903: Online backup with After Image extents - version 7.2D and up
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/05/1998 |
|
Online backup with After Image extents - version 7.2D and up
In Version 7.2D and higher, PROGRESS supports on-line backup with
after-imaging. This is made possible through the support of multiple
variable-length after-image files (AI extents). When you perform an
on-line backup, PROGRESS automatically switches over to a new ai
extent. However, before you perform an on-line backup, make sure the
next extent is empty by using:
rfutil db-name -C aimage extent empty [extent-number/extent-path].
Also, you will need to manually back up the ai extent.
For a specific example:
You could have 2 ai extents defined in your structure file, a1 and a2.
You would start after-imaging using a1. When you perform the on-line
backup, PROGRESS will automatically switch to the a2 extent and will
mark the a1 extent as full. You should first make sure that the a2
extent is empty. You will also need to manually backup the a1 extent.
You should keep your own log file of which ai extent you are using
because this is not put in the database.lg file.
When the online backup starts, it causes an ai extent switch so that
there will be a clean ai extent that begins at the same time the
backup was made. This ai extent is the first one that contains log
records of changes that occurred after the backup began.
The previous ai extent (the one that was active before the switch)
is the last one that goes with the previous backup.
The new ai extent (the one that is active after the switch) goes with
the new backup and is the first one that should be rolled forward
after restoring the backup.
Progress Software Technical Support Note # 13903