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actually,how to deallocate space should be start with how to allocate it.as we know,page is the smallest storage unit in ASE system.extent comprises 8 pages which is smallest user data allocation unit.if you need to more space to contain your data,the system will get un-allocated extent one by one to meet your requirement and will book them as an allocated unit.all of data in some pages will be deleted some time.unless all rows are deleted in this extent,this extent will be treated as an allocated one.so whether extents will be deallocated depands on the way you remove data. |
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