What does the FREQ column show when running the tprof option?（）

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  A . The Query Only property is set to Yes.  B . The Conceal Data property is set to Yes.  C . The Insert Allowed property is set to Yes.  D . The Update Allowed property is set to Yes.

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• What does the FREQ column show when running the tprof option? （）

  A . Total amount of Ticks used by all users B . Total amount of Ticks used by all processes C . Total amount of Ticks used by a specific user D . Total amount of Ticks used by a specific type of proce

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• What type of constraint is used to ensure that each row inserted into the EMPLOYEE table with a value in the WORKDEPT column has a row with a corresponding value in the DEPTNO column of the DEPARTMENT table?（）

  A . A check constraint on the EMPLOYEE table B . A unique constraint on the EMPLOYEE table WORKDEPT column C . A foreign key reference from the DEPARTMENT tables DEPTNO column to the WORKDEPT column of the EMPLOYEE table D . A foreign key reference from the EMPLOYEE tables WORKDEPT column to the DEPTNO column of the DEPARTMENT table

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• What does the SCN represent?（）

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• What does the SCN represent？（）  

  A .  The system change number， which is a point in time relative to transactions within a given database. B .  A number that represents time. Thus， at 1300 hours， the SCN is the same on all databases.  C .  The security change number， which represents the security code that is needed to access any database structure. D .  A conversion factor that converts internal database time to external clock time. E .  UTC time in the database，providing a standardized way of tracking time in Oracle.

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