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The FairCom DB Dynamic Dump feature creates 1 GB file extents by default. For dump backups that are at or near this extent threshold, some dumps may generate X number of extents some days, and X-1 on others, depending on the size of the data at the time of the dump.
When restoring these dumps, be sure to not include an extraneous dump file extents that does not belong to the actual dump being restored. A good check is the physical date and time stamp of the file extent, and be sure the files belong together as a group.
An easy way to avoid this problem is to disable the file extent feature:
!EXT_SIZE NO
This is a recommended default dump script option.
