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This graphic is explained in the accompanying text Example: Restart Locate the document in its SAP Library structure

The database crashed.

For the subsequent Structure linkrestart, the database instance is recovered starting from the time of the last Structure linksavepoint.

This graphic is explained in the accompanying text

No recovery measures are required for transactions T1 and T5. The changes for transaction T1 were recorded in full by the last savepoint. The changes for T5 were rolled back before the crash, and are not yet stored in the data area.

For transactions T4 and T6, the log reader creates the redo log files and relevant entries in the redo list. The redo tasks import the required redo log entries for these transactions.

No recovery measures are required for transactions T2 and T3. However, the modifications made before the savepoint must be reversed. The redo tasks therefore evaluate the relevant undo log files.

 

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