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There are always two ways to solve everything: the easy way and the hard way. Time and time again, I see people choosing the hard way. It is not always done consciously. More often, it is done out of ignorance. They never expected the database to be able to do that. I, on the other hand, expect the database to be capable of anything and only do it the hard way (by writing it myself) when I discover it can t do something. For example, I am frequently asked, How can I make sure the end user has only one session in the database (There are hundreds of other examples I could have used here). This must be a requirement of many applications, but none I ve ever worked on I ve not found a good reason for limiting people in this way. However, people want to do it and when they do, they usually do it the hard way. For example, they will have a batch job run by the operating system that will look at the V$SESSION table and arbitrarily kill sessions of users who have more than one session. Alternatively, they will create their own tables and have the application insert a row when a user logs in and remove the row when they log out. This implementation invariably leads to lots of calls to the help desk because when the application crashes, the row never gets removed. I ve seen lots of other creative ways to do this, but none is as easy as:

You can access historical data to create reports that encompass data from the past. Specify the VERSIONS BETWEEN TIMESTAMP clause to retrieve old values of a table s columns, as shown in the following example: SQL> SELECT * FROM patient_info VERSIONS BETWEEN TIMESTAMP to_timestamp('2009-01-01 00:00:00','YYYY-MM-DD HH23:MI:SS') AND MAXVALUE WHERE name ='ALAPATI'; The query shown here retrieves all versions of the data you selected between January 1, 2009, and today.

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10 rows selected. This works with CLOBs as well as BLOBs. Loading a directory of text files using SQLLDR in this fashion is easy. Loading LOB Data into Object Columns Now that we know how to load into a simple table we have created ourselves, we might also find the need to load into a table that has a complex object type with a LOB in it. This happens most frequently when using the image capabilities. The image capabilities are implemented using a complex object type, ORDSYS.ORDIMAGE. We need to be able to tell SQLLDR how to load into this.

ops$tkyte%ORA11GR2> create profile one_session limit sessions_per_user 1; Profile created. ops$tkyte%ORA11GR2> alter user scott profile one_session; User altered. ops$tkyte%ORA11GR2> alter system set resource_limit=true; System altered. ops$tkyte%ORA11GR2> connect scott/tiger Connected. scott%ORA11GR2> host sqlplus scott/tiger SQL*Plus: Release 11.2.0.1.0 Production on Wed Dec 9 16:02:39 2009 Copyright (c) 1982, 2009, Oracle. All rights reserved.

Information Lifecycle Management (ILM) applications often require multiple versions of a table s rows over time. Specify the VERSIONS BETWEEN TIMESTAMP clause to retrieve all versions of a row or rows over a period of time, as shown in the following example: SQL> SELECT * FROM patient_info VERSIONS BETWEEN TIMESTAMP to_timestamp ('2009-01-01 00:00:00', 'YYYY-MM-DD HH24:MI:SS') AND to_timestamp ('2009-06-30 00:00:00', 'YYYY-MM-DD HH24:MI:SS') WHERE name='ALAPATI'; The query shown here retrieves all versions of the rows in the PATIENT_INFO table between January 1, 2009, and June 30, 2009.

racle has been emphasizing that the Oracle Database 11g server automates management to such an extent that it refers to the database as a self-managing database. Well, this is at least partially true, as several traditional time-consuming and error-prone tasks have been replaced with new ways of managing memory, transactions, and resources, and organizing space. In addition, there have been improvements in backup and recovery techniques. However, the DBA is just as essential as ever. If anything, the DBA s role has become even more central because of the new features added complexity. This chapter deals with the operational aspects of running an Oracle database. Several components of the database require constant monitoring and modifications, and you ll learn about some important Oracle Database 11g features in detail in this chapter. Earlier chapters introduced several topics that you ll see here, and this chapter will tie together the various aspects of Oracle Database 11g that make the DBA s job easier. The chapter highlights two main operational areas: automatic database management features and online management features. Oracle Database 10g introduced the revolutionary Automatic Storage Management (ASM) feature, which helps Oracle DBAs manage disk storage with a built-in Logical Volume Manager (LVM) without requiring a system administrator s involvement. Automatic shared memory management is a useful feature that will help you immensely in your day-to-day administration. The online table redefinition feature will help you perform several routine tasks online without reducing database availability. Furthermore, Oracle Managed Files (OMF) will help you reduce database file-management tasks. In the following sections, you ll explore how adopting these new features can make day-to-day database management easier.

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