The method of realizing common user query x$ base table by creating view and synonym way

See a group of people asked the ordinary user access to the base table problem, the test is as follows:

The x$ base table can be accessed by creating a view, and then creating a synonym, authorization, and access to the base table for ordinary users.

Of course, ordinary users visit the base table is not reasonable, theoretically not necessary, permission control should also be disallowed. It is not considered reasonable here to experiment on this issue.

1. Create synonyms directly on the x$ base table, and other users will not be able to implement access.

Sql> show Useruser is ' SYS ' sql> select COUNT (*) from Sys.x$kcbwds;  COUNT (*)----------         8sql> CREATE public synonym Kcbwds for sys.x$kcbwds; Synonym created. Sql> Grant Select on Sys.x$kcbwds to Bys;grant Select on Sys.x$kcbwds to bys                    *error @ line 1:ora-02030:can only s Elect from fixed tables/views----------sql> show Useruser are "BYS" sql> Select COUNT (*) from Sys.x$kcbwds;select Coun T (*) from Sys.x$kcbwds                         *error on line 1:ora-00942:table or view does not existsql> select COUNT (*) from Kcbwds;sel ECT COUNT (*) from Kcbwds                     *error on line 1:ora-00942:table or view does not exist

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2. Use the method of creating a view on the x$ base table to enable ordinary user access to x$:

Sql> show Useruser is ' SYS ' sql> select COUNT (*) from X$kcbwds; COUNT (*)----------8sql> CREATE View testa as select * from Sys.x$kcbwds; View created. Sql> Grant Select on Sys.testa to Bys; Grant succeeded.  Sql> Conn bys/bysconnected.sql> show Useruser is ' bys ' sql> select COUNT (*) from Sys.testa;    COUNT (*)----------8sql> desc sys.testa Name Null?                                               Type-----------------------------------------------------------------------------ADDR                                            RAW (4) INDX number inst_id                                            Number set_id number pool_id Number Dbwr_num number Blk_size NUMB Omit After er ...

3. More simple access can be achieved by adding synonyms to the view

sql> CREATE public synonym testb for sys.testa; Synonym created.  Sql> show Useruser is ' SYS ' sql> conn/as sysdbaconnected.sql> conn bys/bysconnected.sql> Select COUNT (*) from TESTB;  COUNT (*)----------         8

The method of realizing common user query x$ base table by creating view and synonym way