crystal reports barcode generator free 1: Developing Successful Oracle Applications in Font

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1: Developing Successful Oracle Applications
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This chapter sets out my essential approach to database programming. All databases are not created equal, and in order to develop database-driven applications successfully and on time, you need to understand exactly what your particular database can do and how it does it. If you do not know what your database can do, you run the risk of continually reinventing the wheel developing functionality that the database already provides. If you do not know how your database works, you are likely to develop applications that perform poorly and do not behave in a predictable manner. The chapter takes an empirical look at some applications where a lack of basic understanding of the database has led to project failure. With this example-driven approach, the chapter discusses the basic features and functions of the database that you, the developer, need to understand. The bottom line is that you cannot afford to treat the database as a black box that will simply churn out the answers and take care of scalability and performance by itself.
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2: Architecture Overview
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This chapter covers the basics of Oracle architecture. We start with some clear definitions of two terms that are very misunderstood by many in the Oracle world, namely instance and database. We also take a quick look at the System Global Area (SGA) and the processes behind the Oracle instance, and examine how the simple act of connecting to Oracle takes place.
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INTRODUCTION
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3: Files
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This chapter covers in depth the eight types of files that make up an Oracle database and instance. From the simple parameter file to the data and redo log files, we explore what they are, why they are there, and how we use them.
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4: Memory Structures
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This chapter covers how Oracle uses memory, both in the individual processes (Process Global Area, or PGA, memory) and shared memory (SGA). We explore the differences between manual and automatic PGA and, in Oracle 10g, SGA memory management, and see when each is appropriate. After reading this chapter, you will have an understanding of exactly how Oracle uses and manages memory.
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5: Oracle Processes
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This chapter offers an overview of the types of Oracle processes (server processes versus background processes). It also goes into much more depth on the differences in connecting to the database via a shared server or dedicated server process. We ll also take a look, process by process, at most of the background processes (such as LGWR, DBWR, PMON, and SMON) that we ll see when starting an Oracle instance and discuss the functions of each.
6: Locking and Latching
Different databases have different ways of doing things (what works well in SQL Server may not work as well in Oracle), and understanding how Oracle implements locking and concurrency control is absolutely vital to the success of your application. This chapter discusses Oracle s basic approach to these issues, the types of locks that can be applied (DML, DDL, and latches) and the problems that can arise if locking is not implemented carefully (deadlocking, blocking, and escalation).
7: Concurrency and Multi-Versioning
In this chapter, we ll explore my favorite Oracle feature, multi-versioning, and how it affects concurrency controls and the very design of an application. Here we will see that all databases are not created equal and that their very implementation can have an impact on the design of our applications. We ll start by reviewing the various transaction isolation levels as defined by the ANSI SQL standard and see how they map to the Oracle implementation (as well as how the other databases map to this standard). Then we ll take a look at what implications multiversioning, the feature that allows Oracle to provide non-blocking reads in the database, might have for us.
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