Suppose pctused=40 and pctfree = 10 is set for a table, now as per definition, when the usage of the data block reached 40% or higher , block is removed from free list and new rows can't be inserted, but the block has still (90-40) = 50% approx free space ,so new rows can't be inserted there into that 50% free space ? If new rows can be inserted even if it reached pctused value, how will insert be done as the block will be already removed from free list. Anyone can kindly explain this concept in details. Thanks in advance . I already read documentation on the same but the doubt is still there.