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back (in which case the blocked session succeeds). Another case involves tables linked together via referential integrity constraints. An insert into a child table may become blocked if the parent row it depends on is being created or deleted. Blocked INSERTs typically happen with applications that allow the end user to generate the primary key/unique column value. This situation is most easily avoided by using a sequence to generate the primary key/unique column value. Sequences were designed to be a highly concurrent method of generating unique keys in a multiuser environment. In the event that you cannot use a sequence, you can use the following technique, which avoids the issue by using manual locks implemented via the built-in DBMS_LOCK package.

with regard to its practical use. The second half of the chapter focuses on external tables, an alternative and highly efficient means by which to bulk load and unload data.

system on a test system, thus introducing a serious element of uncertainly when undertaking major system changes. Oracle Database 11g has introduced two key features, called Database Replay and SQL Performance Analyzer, to help you manage change confidently. I briefly review these two interesting features in the following sections. 20 contains a detailed discussion of these two change management features.

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Database Replay lets you test the impact of system changes by replaying and testing a production workload on a test system first. You first capture the production workload of the production database over a representative period of time such as a peak period. You then move this captured data over to a test system and replay the workload on that system, which you configure in an identical fashion to the production system. The replay of the production workload on the test system shows you the errors, data and performance divergence, and other statistics that help you determine whether you can safely make the change on the production system.

This chapter looks at the opportunities for encrypting data in the Oracle database. A discussion of manual do it yourself encryption using the built-in database package DBMS_CRYPTO is included, but not emphasized. Rather, a discussion on why you should probably not be using that package is included. The focus of this chapter is on the implementation details of Transparent Data Encryption (TDE) in the Oracle Database. This chapter focuses on how both column level and tablespace level encryption are achieved and what it means to you as a developer or DBA. Not every possible configuration possibility is described (that is what the Oracle documentation is for), but rather the practical implementation details and how they will affect you are laid out.

Note The following example demonstrates how to prevent a session from blocking on an insert due to a

The SQL Performance Analyzer helps you assess the impact of a system change on the SQL statements that are part of your database workload. This analyzer gives you detailed information about the performance of the SQL statements, including before- and after-change exertion statistics. You can use the analysis to make a decision as to whether the system changes (such as a database upgrade) that you re planning will lead to an improvement in performance.

As in the case of the traditional export and import utilities, Data Pump uses dump files and other log files, but there are significant differences. You ll use three types of files for Data Pump operations: Dump files: These hold the table data as well as the metadata that s being loaded or unloaded. Log files: These are the standard files for logging the messages and results of Data Pump operations. SQL files: Data Pump Import uses a special parameter called SQLFILE, which will write all the DDL statements it will execute during the import job to a file. Data Pump doesn t actually execute the SQL, but merely writes the DDL statements to the file specified by the SQLFILE parameter. You use SQL files only to hold the output of the SQLFILE command during a Data Pump Import job. This parameter is discussed in the Data Pump Import Parameters section later in this chapter. As in the case of the older export/import utilities, all new log files (and SQL files) will overwrite any older files with the same name. If an older dump file of the same name already exists, you ll get an error. Unlike with the traditional export and import utilities, you use directories and directory objects to store the Data Pump files. The following section explains how to use directory objects.

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