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In this example, we ll reorganize the employees table in the HR schema, which has the structure shown in Listing 17-8. For this example, our goal is to drop the salary column in the employees table. Listing 17-8. The Structure of the employees Table Name --------------EMPLOYEE_ID FIRST_NAME LAST_NAME EMAIL PHONE_NUMBER HIRE_DATE JOB_ID SALARY COMMISSION_PCT MANAGER_ID DEPARTMENT_ID Null -------NOT NULL NOT NULL NOT NULL NOT NULL NOT NULL Type -----------NUMBER(6) VARCHAR2(20) VARCHAR2(25) VARCHAR2(25) VARCHAR2(20) DATE VARCHAR2(10) NUMBER(8,2) NUMBER(2,2) NUMBER(6) NUMBER(4)

Oracle enhances the Windows security model by providing two features that use the Oracle Public Key Infrastructure (PKI) in an improved manner. These features are the use of Oracle Wallets in the Windows registry and the Microsoft Certificate Store integration.

The goal is to remove the salary column in the employees table and partition the table using a range scheme based on the employee_id column. Once we have completed the online redefinition, we can drop the temporary table. The new table will have all the attributes of the temporary table.

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According to the mass/energy equivalence principle stemming from special relativity, if the increasing mass of a clock did not require increasing amounts of energy to keep accelerating it toward the speed of light, the clock could possibly reach a point where its time would stand still from the perspective of outside observers; i.e., the clock would have reached the speed of light, which today s world of science accepts as an impossibility. Having clocks made from light itself might certainly satisfy the desires of many who are dismayed at the seemingly swift passage of time in their lives! No doubt there is an element of transcendence here, Sam pondered. But they have not grasped how to reach that transcendence except through experimentations that try to approximate it at the subatomic levels. At least they are trying! If light itself could be used to construct an NTP clock light that already moves at the speed of light then that clock could become the ultimate NTP clock source. After all, that

Oracle lets you store Oracle Wallets in the Windows registry, thus providing an additional layer of security for Wallets. You can use both the Oracle Wallet Manager and the Oracle Enterprise Login Assistant to provide single sign-on for Oracle PKI applications.

The first step in the online redefinition process is to ensure that the employees table is a candidate for the process by using the DBMS_REDEFINITION package. If your table is not eligible, Oracle will issue an error message. The following example shows the use of the package for verifying the employees table: SQL> BEGIN 2 DBMS_REDEFINITION.CAN_REDEF_TABLE('hr','employees'); 3 END; 4 / PL/SQL procedure successfully completed. SQL> In the DBMS_REDEFINITION.CAN_REDEF_TABLE procedure, you can specify the method of online redefinition as the third parameter, in addition to the schema owner name (hr) and the table name (employees). This third parameter is called the options_flag, and it can take two possible values: DBMS_REDEFINITION.CONS_USE_PK if you want to use the primary key method or DBMS_REDEFINITION. CONS_USE_ROWID if you want to use ROWIDs to do the redefinition. Because you re using the default primary key method, you don t have to specify this third parameter for your procedure.

Oracle s PKI applications are designed to work with Oracle products. However, by integrating with the Microsoft Certificate Store, Oracle s PKI credentials for public key security services can be used by non-Oracle applications using Microsoft PKI.

Now that the employees table has indeed been verified as an eligible candidate for redefinition, we ll move to the next step, where we ll create an interim table.

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