The PCTUSED parameter sets the minimum percentage of a block that can be used for
row data plus overhead before new rows are added to the block. After a data block is
filled to the limit determined by PCTFREE, Oracle considers the block unavailable for the insertion of new rows until the percentage of that block falls beneath the parameter
PCTUSED. Until this value is achieved, Oracle uses the free space of the data block only
for updates to rows already contained in the data block.
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