User Guide

SAP AG November 2002
Parallel converter queries
• Multi-region converter:
Converter queries can be made to multiple critical regions in parallel
Improved log management
Separation of before and after images
• Before images are stored in transaction-specific undo log files
• After images are stored in the log volume
Checkpoints are obsolete
• Each database backup is consistent, even without the entries in the log volume
• The database can be started when the log is missing
Parallel archiving of log entries
• You can configure the number of parallel log volumes
• You can configure the number of parallel log queues
Parallel writing of before images
• Before images for transactions executed in parallel can be written in parallel, as the
system stores these in transaction-specific undo log files
Improved backup
• Incremental data backups contain all changes since the last full data backup
• The restore process is therefore simplified. When restoring, you must only import the last
full data backup and the last incremental data backup
Terms
Application data [Page 125]
Automatic log backup [Page
126]
Backup [Page
126]
Backup history [Page
126]
Backup ID [Page
127]
Backup medium [Page 127]
128B* Tree [Page ]
Cache [Page
129]
Catalog [Page
129]
COMMIT [Page
129]
Converter [Page
129]
Data Caches [Page
130]
Data volume [Page
130]
User Manual: SAP DB 123