How to estimate uncompress row count or percentage of these table ?

thrupass

    env

    ----------

    Oracle 12.1.0.2

    Exadata

     

     

    tab_basic : row store compress basic

    tab_qh : compress for query high

    * Data loaded by direct-path INSERT operations

     

     

    There are two compressed tables.

    Several DML happened to these tables....

    How to estimate uncompress row count or percentage of these table ?

     

    Thanks in advance

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