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

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CHAPTER 12 ■ DATATYPES 503 ops$tkyte@ORA10GR1> create table t ( raw_data raw(16) ); Table created. The RAW type is much like the VARCHAR2 type in terms of storage on disk. The RAW type is a variable-length binary string, meaning that the table T just created, for example, may store anywhere from 0 to 16 bytes of binary data. It is not padded out like the CHAR type. When dealing with RAW data, you will likely find it being implicitly converted to a VARCHAR2 type—that is, many tools such as SQL*Plus will not display the RAW data directly, but will convert it to a hexadecimal format for display. In the following example, we create some binary data in our table using SYS_GUID(), a built-in function that returns a 16-byte RAW string that is globally unique (GUID stands for globally unique identifier): ops$tkyte@ORA10GR1> insert into t values ( sys_guid() ); 1 row created. ops$tkyte@ORA10GR1> select * from t; RAW_DATA -------------------------------- FD1EB03D3718077BE030007F01002FF5 You can immediately note two things here. First, the RAW data looks like a character string. That is just how SQL*Plus retrieved and printed it, and that is not how it is stored on disk. SQL*Plus cannot print arbitrary binary data on your screen, as that could have serious side effects on the display. Remember that binary data may include control characters such as a carriage return or linefeed, or maybe a Ctrl+G character that would cause your terminal to “beep.” Second, the RAW data looks much larger than 16 bytes—in fact, in this example, you can see 32 characters. This is due to the fact that every binary byte takes two hexadecimal characters to display. The stored RAW data is really 16 bytes in length, and you can see this using the Oracle DUMP function. Here, I am “dumping” the value of the binary string and using the optional parameter to specify the base that should be used when displaying the value of each byte. I am using base 16, so we can compare the results of dump with the previous string: ops$tkyte@ORA10GR1> select dump(raw_data,16) from t; DUMP(RAW_DATA,16) ------------------------------------------------------------------------------- Typ=23 Len=16: fd,1e,b0,3d,37,18,7,7b,e0,30,0,7f,1,0,2f,f5 So, DUMP shows us this binary string is in fact 16 bytes long (LEN=16) and displays the binary data byte by byte. As we can see, this dump display matches up with the implicit conversion performed when SQL*Plus fetched the RAW data into a string. This implicit conversion goes the other direction as well: ops$tkyte@ORA10GR1> insert into t values ( 'abcdef' ); 1 row created. That did not insert the string abcdef, but rather a 3-byte RAW with the bytes AB, CD, EF, or in decimal with the bytes 171, 205, 239. If you attempt to use a string that does not consist of valid hex characters, you will receive an error message:
504 CHAPTER 12 ■ DATATYPES ops$tkyte@ORA10GR1> insert into t values ( 'abcdefgh' ); insert into t values ( 'abcdefgh' ) * ERROR at line 1: ORA-01465: invalid hex number The RAW type may be indexed and used in predicates—it is as functional as any other datatype. However, you must take care to avoid unwanted implicit conversions, and you must be aware that they will occur. I prefer and recommend using explicit conversions in all cases, which can be performed using the following built-in functions: • HEXTORAW: To convert strings of hexadecimal characters to the RAW type • RAWTOHEX: To convert RAW strings to hexadecimal strings The RAWTOHEX function is invoked implicitly by SQL*Plus when it fetches a RAW type into a string, and the HEXTORAW function is invoked implicitly when inserting the string. It is a good practice to avoid implicit conversions and to always be explicit when coding. So the previous examples could have been written as follows: ops$tkyte@ORA10GR1> select rawtohex(raw_data) from t; RAWTOHEX(RAW_DATA) -------------------------------- FD1EB03D3718077BE030007F01002FF5 ops$tkyte@ORA10GR1> insert into t values ( hextoraw('abcdef') ); 1 row created. Number Types Oracle 10g supports three native datatypes suitable for storing numbers. Oracle9i Release 2 and earlier support exactly one native datatype suitable for storing numeric data. In this list, the NUMBER type is supported by all releases, and the subsequent two types are new datatypes supported only in Oracle 10g and later: • NUMBER: The Oracle NUMBER type is capable of storing numbers with an extremely large degree of precision—38 digits of precision, in fact. The underlying data format is similar to a “packed decimal” representation. The Oracle NUMBER type is a variable-length format from 0 to 22 bytes in length. It is appropriate for storing any number as small as 10e -130 and numbers up to but not including 10e 126 . This is by far the most common NUMBER type in use today. • BINARY_FLOAT: This is an IEEE native single-precision floating-point number. On disk it will consume 5 bytes of storage: 4 fixed bytes for the floating-point number and 1 length byte. It is capable of storing numbers in the range of ~ ± 10 38.53 with 6 digits of precision.
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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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■SETTING UP YOUR ENVIRONMENT xlii
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CHAPTER 1 ■ ■ ■ Developing Su
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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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CHAPTER 3 ■ ■ ■ Files In this
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CHAPTER 3 ■ FILES 69 and even dat
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CHAPTER 3 ■ FILES 71 all operatio
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CHAPTER 3 ■ FILES 79 • Resource
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CHAPTER 3 ■ FILES 87 6 ( 7 TYPE O
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CHAPTER 3 ■ FILES 89 A Brief Revi
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CHAPTER 3 ■ FILES 91 Redundant Ar
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CHAPTER 3 ■ FILES 93 (data from m
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CHAPTER 3 ■ FILES 95 dictionary t
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CHAPTER 3 ■ FILES 99 “accidenta
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CHAPTER 3 ■ FILES 107 Flashback L
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CHAPTER 3 ■ FILES 111 IMPDP, howe
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CHAPTER 3 ■ FILES 113 tkyte@ORA10
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CHAPTER 4 ■ ■ ■ Memory Struct
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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CHAPTER 5 ■ ■ ■ Oracle Proces
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CHAPTER 5 ■ ORACLE PROCESSES 157
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CHAPTER 6 ■ ■ ■ Locking and L
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CHAPTER 6 ■ LOCKING AND LATCHING
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CHAPTER 8 ■ ■ ■ Transactions
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CHAPTER 8 ■ TRANSACTIONS 265 busi
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284 CHAPTER 9 ■ REDO AND UNDO cri
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292 CHAPTER 9 ■ REDO AND UNDO Wha
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294 CHAPTER 9 ■ REDO AND UNDO row
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296 CHAPTER 9 ■ REDO AND UNDO If
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298 CHAPTER 9 ■ REDO AND UNDO ops
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300 CHAPTER 9 ■ REDO AND UNDO Inv
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306 CHAPTER 9 ■ REDO AND UNDO ins
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318 CHAPTER 9 ■ REDO AND UNDO •
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326 CHAPTER 9 ■ REDO AND UNDO wil
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328 CHAPTER 9 ■ REDO AND UNDO Thi
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332 CHAPTER 9 ■ REDO AND UNDO Whe
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334 CHAPTER 9 ■ REDO AND UNDO Tha
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336 CHAPTER 9 ■ REDO AND UNDO tou
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338 CHAPTER 10 ■ DATABASE TABLES
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CHAPTER 11 ■ ■ ■ Indexes Inde
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CHAPTER 11 ■ INDEXES 423 value of
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CHAPTER 11 ■ INDEXES 425 One of t
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CHAPTER 11 ■ INDEXES 427 We then
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CHAPTER 11 ■ INDEXES 429 we ended
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CHAPTER 11 ■ INDEXES 431 The data
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CHAPTER 11 ■ INDEXES 435 Table 11
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CHAPTER 11 ■ INDEXES 437 When Sho
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CHAPTER 11 ■ INDEXES 439 an 8KB b
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CHAPTER 11 ■ INDEXES 441 select *
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CHAPTER 11 ■ INDEXES 443 select *
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CHAPTER 11 ■ INDEXES 445 Indicate
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CHAPTER 11 ■ INDEXES 447 an index
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CHAPTER 11 ■ INDEXES 449 Table 11
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CHAPTER 12 ■ DATATYPES 555 ROWID/
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CHAPTER 13 ■ ■ ■ Partitioning
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CHAPTER 13 ■ PARTITIONING 559 6 (
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CHAPTER 13 ■ PARTITIONING 561 els
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CHAPTER 13 ■ PARTITIONING 565 Enh
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706 ■INDEX autonomous transaction
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