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

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CHAPTER 12 ■ DATATYPES 491 • TIMESTAMP WITH LOCAL TIME ZONE: This is a fixed-width 7- or 11-byte date/time datatype just as the TIMESTAMP is; however, it is time zone sensitive. Upon modification in the database, the TIME ZONE supplied with the data is consulted, and the date/time component is normalized to the database time zone. So, if you were to insert a date/time using the time zone U.S./Pacific and the database time zone was U.S./Eastern, the final date/time information would be converted to the Eastern time zone and stored as a TIMESTAMP would be. Upon retrieval, the TIMESTAMP stored in the database would be converted to the time in the session’s time zone. • INTERVAL YEAR TO MONTH: This is a fixed-width 5-byte datatype that stores a duration of time, in this case as a number of years and months. You may use intervals in date arithmetic to add or subtract a period of time from a DATE or the TIMESTAMP types. • INTERVAL DAY TO SECOND: This is a fixed-width 11-byte datatype that stores a duration of time, in this case as a number of days and hours, minutes, and seconds, optionally with up to 9 digits of fractional seconds. • BFILE: This datatype permits you to store an Oracle directory object (a pointer to an operating system directory) and a file name in a database column and to read this file. This effectively allows you to access operating system files available on the database server in a read-only fashion, as if they were stored in the database table itself. • BLOB: This datatype permits for the storage of up to 4GB of data in Oracle9i and earlier or (4GB)✕(database blocksize) bytes of data in Oracle 10g and later. BLOBs contain “binary” information that is not subject to character set conversion. This would be an appropriate type to store a spreadsheet, a word processing document, image files, and the like. • CLOB: This datatype permits for the storage of up to 4GB of data in Oracle9i and earlier or (4GB)✕(database blocksize) bytes of data in Oracle 10g and later. CLOBs contain information that is subject to character set conversion. This would be an appropriate type to store plain-text information in. • NCLOB: This datatype permits for the storage of up to 4GB of data in Oracle9i and earlier or (4GB)✕(database blocksize) bytes of data in Oracle 10g and later. NCLOBs store information encoded in the national character set of the database and are subject to character set conversions just as CLOBs are. • ROWID: A ROWID is effectively a 10-byte address of a row in a database. Sufficient information is encoded in the ROWID to locate the row on disk, as well as identify the object the ROWID points to (the table and so on). • UROWID: A UROWID is a universal ROWID and is used for tables, such as IOTs and tables accessed via gateways to heterogeneous databases, that do not have fixed ROWIDs. The UROWID is a representation of the primary key value of the row and, hence, will vary in size depending on the object it points to. Many types are apparently missing from the preceding list, such as INT, INTEGER, SMALLINT, FLOAT, REAL, and others. These types are actually implemented on top of one of the base types in the preceding list—that is, they are synonyms for the native Oracle type. Additionally, datatypes such as XMLType, SYS.ANYTYPE, and SDO_GEOMETRY are not listed either, as we will not
492 CHAPTER 12 ■ DATATYPES cover them in this book. They are complex object types comprising a collection of attributes along with the methods (functions) that operate on those attributes. They are made up of the basic datatypes listed previously and are not truly datatypes in the conventional sense, but rather an implementation, a set of functionality, that you may make use of in your applications. Now, let’s take a closer look at these basic datatypes. Character and Binary String Types Character datatypes in Oracle, namely CHAR, VARCHAR2, and their “N” variants, NCHAR and NVARCHAR2, are capable of storing either 2,000 bytes or 4,000 bytes of text. This text is converted between various character sets as needed by the database. A character set is a binary representation of individual characters in bits and bytes. Many different character sets are available, and each is capable of representing different characters, for example: • The US7ASCII character set is the ASCII standard representation of 128 characters. It uses the low 7 bits of a byte to represent these 128 characters. • The WE8ISO8859P1 character set is a Western European character set capable of representing the 128 ASCII characters as well as 128 extended characters, using all 8 bits of a byte. Before we get into the details of CHAR, VARCHAR2, and their “N” variants, it would benefit us to get a cursory understanding of what these different character sets mean to us. NLS Overview As stated earlier, NLS stands for National Language Support. NLS is a very powerful feature of the database, but one that is often not as well understood as it should be. NLS controls many aspects of our data. For example, it controls how data is sorted, and whether we see commas and a single period in a number (e.g., 1,000,000.01) or many periods and a single comma (e.g., 1.000.000,01). But most important, it controls the following: • Encoding of the textual data as stored persistently on disk • Transparent conversion of data from character set to character set It is this transparent part that confuses people the most—it is so transparent, you cannot even really see it happening. Let’s look at a small example. Suppose you are storing 8-bit data in a WE8ISO8859P1 character set in your database, but you have some clients that connect using a 7-bit character set such as US7ASCII. These clients are not expecting 8-bit data and need to have the data from the database converted into something they can use. While this sounds wonderful, if you are not aware of it taking place, then you might well find that your data “loses” characters over time as the characters that are not available in US7ASCII are translated into some character that is. This is due to the character set translation taking place. In short, if you retrieve data from the database in character set 1, convert it to character set 2, and then insert it back (reversing the process), there is a very good chance that you have materially modified the data. Character set conversion is typically a process that will change the data, and you are usually mapping a large set of characters
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Expert Oracle Database Architecture
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Contents Foreword . . . . . . . . .
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■CONTENTS v Block Buffer Cache .
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■CONTENTS vii ■CHAPTER 9 Redo a
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■CONTENTS ix ■CHAPTER 12 Dataty
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Foreword “THINK.” In 1914, Thom
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■FOREWORD xiii Tom is an aficiona
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About the Technical Reviewers ■JO
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Introduction The inspiration for th
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■INTRODUCTION xix • Exposure to
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■INTRODUCTION xxi Chapter 3: File
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■INTRODUCTION xxiii Next up are t
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Setting Up Your Environment In this
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338 CHAPTER 10 ■ DATABASE TABLES
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CHAPTER 11 ■ ■ ■ Indexes Inde
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CHAPTER 13 ■ ■ ■ Partitioning
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