Troubleshooting Oracle Performance by Christian Antognini

By Christian Antognini

Troubleshooting Oracle functionality, 2d version is your systematic consultant to diagnosing and resolving functionality difficulties in database-backed functions concerning Oracles database engine. Christian Antognini brings a decade and a part event to his subject. His first version is among the so much well-respected books in its box. This moment variation has been conscientiously up to date to hide the most recent advancements in Oracle Database 11g free up 2 via Oracle Database 12c.

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Unfortunately, all too often this is where the real trouble starts. In a typical scenario, where everyone is looking for the source of a performance problem, developers blame the database for poor performance, and the database administrators blame both the developers for misusing the database and the storage subsystem administrators because their very expensive piece of hardware ought to provide much better performance. And as the complexity of the application and infrastructure supporting it increases, so does the mess.

Chapter 2 ■ Key Concepts a slight but important difference. Independently of how many rows the query returns, the first block doesn’t generate an exception. Instead, the second block generates an exception if zero or several rows are returned. How Parsing Works The previous section describes the life cycle of cursors, and this section focuses on the parse phase. The steps carried out during this phase, as shown in Figure 2-3, are the following: 1. Include VPD predicates: If Virtual Private Database (VPD, formerly known as row-level security) is in use and active for one of the tables referenced in the parsed SQL statement, the predicates generated by the security policies are included in its WHERE clause.

In the case of Figure 2-5, you have two problems. The first is that the servlet (FrameworkServlet) is a class provided by the Spring framework. Therefore, you don’t want to modify it. The second is that the data access object (AccountDao) is just an interface used by the persistence framework (iBatis in this case). Therefore, you can’t add code to it either. For the first problem, you could create your own servlet that inherits from FrameworkServlet by simply adding the instrumentation code. For the second one, you could decide to instrument the call to the persistence framework for the sake of simplicity.

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