Kbase P66766: What is a Before-image Cluster
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/06/2010 |
|
Status: Unverified
GOAL:
What is a Before-image Cluster
FIX:
The Progress database manager's before-image log is divided into fixed-size units of storage space called clusters. When the before-image log must be expanded, it is expanded one cluster at a time. The cluster size can be changed when the before-image log is truncated. Clusters are reused when the data they contain is no longer needed for transaction rollback or crash recovery. Whenever a cluster is filled, an asynchronous checkpoint is initiated