Lack of Contiguous Space
If the database server cannot find available contiguous space in the first chunk equal to the size specified for the next extent, it extends the search to the next chunk in the dbspace. Extents are not allowed to span chunks.
If the database server cannot find adequate contiguous space anywhere in the dbspace, it allocates to the table the largest available amount of contiguous space. (The minimum allocation is four pages. The default value is eight pages.) No error message is returned if an allocation is possible, even when the amount of space allocated is less than the requested amount.