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CHAPTER 17 AUTOMATIC MANAGEMENT AND ONLINE CAPABILITIES
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different tablespaces, reduce fragmentation in tables, and change a heap table into an indexorganized table and vice versa, all while maintaining database availability and performance. The online data-redefinition feature can enhance both data availability and disk usage. Both the newly redefined table and the original table continue to exist together until the DBA decides to switch over to the newly redefined table. The length of the switching process is extremely brief and doesn t depend on table or index size or the complexity of the object redefinition. During the redefinition process, local materialized logs are maintained and changes to the master table are tracked using snapshot logs. If you have materialized views and materialized logs defined on a table, you can t redefine them online.
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Whenever possible, use the Segment Advisor for shrinking segments and reclaiming unused space below the HWM. However, if a segment doesn t qualify for the use of the Segment Advisor, as is the case when you use dictionary-managed tablespaces or manual segment space management, use the online table-redefinition technique to reorganize segment data. You also use online table redefinition if you plan on making logical or physical changes to any table attributes during the reorganization.
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What Can Online Redefinition Do
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You can use online redefinition to perform a number of tasks that would have necessitated taking tables offline in early versions of Oracle. Using the online table-redefinition feature, you can do the following: Add, drop, or rename columns Transform table data Change data types of the columns Rename table constraints Change the original storage parameters Reduce fragmentation in tables Create a partitioned table out of a regular table online Create an index-organized table (IOT) out of a regular table Move a table to a different tablespace The list of tasks you can perform using online redefinition is truly impressive, because you don t have to keep users from accessing the tables while you re performing these common tasks. The online table redefinition involves a simple sequence of steps: 1. Determine whether a table is a good candidate for redefinition. 2. Decide on the structure of the new table, and create a new image of the table. 3. Start the redefinition process by using the DBMS_REDEFINITION package. 4. Create necessary constraints and triggers on the new table. 5. Perform periodic synchronization and validation of data in the new table. 6. Complete the redefinition of the table. You can perform online table redefinition using one of two methods: a primary key method and a ROWID method. The ROWID method is more complex, and Oracle recommends you use the easier primary key method, which requires that the original and the redefined tables have the same
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CHAPTER 17 AUTOMATIC MANAGEMENT AND ONLINE CAPABILITIES
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primary key columns. In the following sections, you ll see how to perform online table redefinition using the default primary key method.
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An Online Table-Redefinition Example
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In this example, we ll reorganize the employees table in the HR schema, which has the structure shown in Listing 17-11. For this example, our goal is to drop the salary column in the employees table. Listing 17-11. The Structure of the employees Table Name Null Type ----------------------------------------- -------- ----EMPLOYEE_ID NOT NULL NUMBER(6) FIRST_NAME VARCHAR2(20) LAST_NAME NOT NULL VARCHAR2(25) EMAIL NOT NULL VARCHAR2(25) PHONE_NUMBER VARCHAR2(20) HIRE_DATE NOT NULL DATE JOB_ID NOT NULL VARCHAR2(10) SALARY NUMBER(8,2) COMMISSION_PCT NUMBER(2,2) MANAGER_ID NUMBER(6) DEPARTMENT_ID NUMBER(4) 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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Verifying the Eligibility of the Table
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_REDIF_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.
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