Hi,
I am curious if anybody has seen this scenario.
I am involved in a migration effort of erp 617 SP04 to hana 8.x utilizing sum and swpm.
The first iteration of the migration was on hana 8.3. The second iteration was on 85.02.
What I noticed in the second iteration is that the $delta$ container for column tables is not releasing used space after merge operations post swpm work.
One thing to keep in mind is the source for both iterations is the same but different in age by a few months.
Table Example with almost the same records and attribute container values:
First Iteration: the $delta$ container was 16,77,216 bytes after the migration completed.
Second Iteration: the $delta$ container was 82,040,586,240 bytes after the migration completed.
If I load the table, from the second iteration, completely into memory, I can see the total memory size is 13,558,978,829 bytes.
The delta is 37,016 bytes.
After trying to manually merge the table nothing changes pointing to empty space in the $delta$ virtual file container that is not being released.
From a database perspective there is about 800GB of potentially wasted space from this occurring.
Thanks,
Troy