Once the partition from the TransactionHistory table is switched out, the empty
partition that previously contained the September 2003 data is not needed anymore,
and it can be merged with the extreme left partition.
Select the boundary point for September 1, 2003 and click Remove Boundary.
Finally, it is necessary to merge the partition, which contains the September data
that was just added, with other data in the TransactionHistoryArchive table. Remove
the boundary point for September 1, 2003 the same way.
