Oracle Magazine, July/August 2017
Database Developer and DBA ETL partition elimination defines that data to be impossible However scanning all the data by using a nonpartition key predicate reveals that the data is present in the file It is your responsibility to ensure that the file data maps correctly to the partition definition ORACLE MAGAZINE JULY AUGUST 2017 95 SQL select from ext_ emp where region XX no rows selected SQL select from ext_ emp where empno 1934 RE EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO XX 1934 MILLER CLERK 7782 23 JAN 82 1300 10 PROCESS CONTROL As long as software applications have existed process controls on the management deployment and maintenance of those applications have also existed Entire practice management frameworks such as the Information Technology Infrastructure Library ITIL which have established a suite of standards and procedures for any part of the application development lifecycle are now commonplace in most organizations As part of current standards and procedures structural changes to objects via data definition language DDL are much more tightly controlled But unlike the DDL for a standard Oracle Database table the success of a DDL statement defining an external table is not a guarantee that the definition is valid As such there are pros and cons to such tight controls over DDL deployment for external tables
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