Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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■INTRODUCTION xxiii Next up are the LOB datatypes. We’ll cover how they are stored and what each of the many settings such as IN ROW, CHUNK, RETENTION, CACHE, and so on mean to us. When dealing with LOBs, it is important to understand how they are implemented and how they are stored by default—especially when it comes to tuning their retrieval and storage. We close the chapter by looking at the ROWID and UROWID types. These are special types, proprietary to Oracle, that represent the address of a row. We’ll cover when to use them as a column datatype in a table (which is almost never!). Chapter 13: Partitioning Partitioning is designed to facilitate the management of very large tables and indexes, by implementing a “divide and conquer” logic—basically breaking up a table or index into many smaller and more manageable pieces. It is an area where the DBA and developer must work together to maximize application availability and performance. This chapter covers both table and index partitioning. We look at partitioning using local indexes (common in data warehouses) and global indexes (common in OLTP systems). Chapter 14: Parallel Execution This chapter introduces the concept of and uses for parallel execution in Oracle. We’ll start by looking at when parallel processing is useful and should be considered, as well as when it should not be considered. After gaining that understanding, we move on to the mechanics of parallel query, the feature most people associate with parallel execution. Next we cover parallel DML (PDML), which allows us to perform modifications using parallel execution. We’ll see how PDML is physically implemented and why that implementation leads to a series of restrictions regarding PDML. We then move on to parallel DDL. This, in my opinion, is where parallel execution really shines. Typically, DBAs have small maintenance windows in which to perform large operations. Parallel DDL gives DBAs the ability to fully exploit the machine resources they have available, permitting them to finish large, complex operations in a fraction of the time it would take to do them serially. The chapter closes on procedural parallelism, the means by which we can execute application code in parallel. We cover two techniques here. The first is parallel pipelined functions, or the ability of Oracle to execute stored functions in parallel dynamically. The second is do-ityourself (DIY) parallelism, whereby we design the application to run concurrently. Chapter 15: Data Loading and Unloading This first half of this chapter focuses on SQL*Loader (SQLLDR) and covers the various ways in which we can use this tool to load and modify data in the database. Issues discussed include loading delimited data, updating existing rows and inserting new ones, unloading data, and calling SQLLDR from a stored procedure. Again, SQLLDR is a well-established and crucial tool, but it is the source of many questions 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.
xxiv ■INTRODUCTION Source Code and Updates As you work through the examples in this book, you may decide that you prefer to type in all the code by hand. Many readers choose to do this because it is a good way to get familiar with the coding techniques that are being used. Whether you want to type the code in or not, all the source code for this book is available in the Source Code section of the Apress web site (http://www.apress.com). If you like to type in the code, you can use the source code files to check the results you should be getting—they should be your first stop if you think you might have typed in an error. If you don’t like typing, then downloading the source code from the Apress web site is a must! Either way, the code files will help you with updates and debugging. Errata Apress makes every effort to make sure that there are no errors in the text or the code. However, to err is human, and as such we recognize the need to keep you informed of any mistakes as they’re discovered and corrected. Errata sheets are available for all our books at http:// www.apress.com. If you find an error that hasn’t already been reported, please let us know. The Apress web site acts as a focus for other information and support, including the code from all Apress books, sample chapters, previews of forthcoming titles, and articles on related topics.
Page 2 and 3: Expert Oracle Database Architecture
Page 4 and 5: Contents Foreword . . . . . . . . .
Page 6 and 7: ■CONTENTS v Block Buffer Cache .
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Page 12 and 13: Foreword “THINK.” In 1914, Thom
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Page 16 and 17: About the Technical Reviewers ■JO
Page 18 and 19: Introduction The inspiration for th
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CHAPTER 3 ■ FILES 71 all operatio
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CHAPTER 13 ■ ■ ■ Partitioning
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