============================ objd: Is assigned to each data object, such as table or index when it is created, and it is unique within the database.
objd: 刚开始的时候表的objn和objd是一样,每次truncate table后objd的值将会逐渐增加。视图的objd值为0。
----------- data block address (DBA):
The DBA (here: not the database administrator but the data block address) uniquely identifies a database block in the database. Behind such a database block address is a datafile number and the block number within that database file. The datafile number can be found with dbms_utility.data_block_address_file. The block number within this file can be found with dbms_utility.data_block_address_block. A database block address can be constructed from a datafile number and a block number with make_data_block_address.
----------- slot: DBMS_ROWID can be used to convert ROWIDs into a File id (rowid_relative_fno) Block number (rowid_block_number) Slot number in block (rowid_row_number)
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