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

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CHAPTER 13 ■ PARTITIONING 573 35 '$POS$', x.pos), 36 '$PNAME$', x.pname ); 37 end loop; Now, we’ll take that query and select out the partition position (PNAME) and the count of rows in that partition (CNT). Using RPAD, we’ll construct a rather rudimentary but effective histogram: 38 39 open p_cursor for 40 'select pname, cnt, 41 substr( rpad(''*'',30*round( cnt/max(cnt)over(),2),''*''),1,30) hg 42 from (' || substr( l_text, 1, length(l_text)-11 ) || ') 43 order by oc'; 44 45 end; 46 / Procedure created. If we run this with an input of 4, for four hash partitions, we would expect to see output similar to the following: ops$tkyte@ORA10G> variable x refcursor ops$tkyte@ORA10G> set autoprint on ops$tkyte@ORA10G> exec hash_proc( 4, :x ); PL/SQL procedure successfully completed. PN CNT HG -- ---------- ------------------------------ p1 12141 ***************************** p2 12178 ***************************** p3 12417 ****************************** p4 12105 ***************************** The simple histogram depicted shows a nice, even distribution of data over each of the four partitions. Each has close to the same number of rows in it. However, if we simply go from four to five hash partitions, we’ll see the following: ops$tkyte@ORA10G> exec hash_proc( 5, :x ); PL/SQL procedure successfully completed. PN CNT HG -- ---------- ------------------------------ p1 6102 ************** p2 12180 ***************************** p3 12419 ****************************** p4 12106 ***************************** p5 6040 **************
574 CHAPTER 13 ■ PARTITIONING This histogram points out that the first and last partitions have just half as many rows as the interior partitions. The data is not very evenly distributed at all. We’ll see the trend continue for six and seven hash partitions: ops$tkyte@ORA10G> exec hash_proc( 6, :x ); PL/SQL procedure successfully completed. PN CNT HG -- ---------- ------------------------------ p1 6104 ************** p2 6175 *************** p3 12420 ****************************** p4 12106 ***************************** p5 6040 ************** p6 6009 ************** 6 rows selected. ops$tkyte@ORA10G> exec hash_proc( 7, :x ); PL/SQL procedure successfully completed. PN CNT HG -- ---------- ------------------------------ p1 6105 *************** p2 6176 *************** p3 6161 *************** p4 12106 ****************************** p5 6041 *************** p6 6010 *************** p7 6263 *************** 7 rows selected. As soon as we get back to a number of hash partitions that is a power of two, we achieve the goal of even distribution once again: ops$tkyte@ORA10G> exec hash_proc( 8, :x ); PL/SQL procedure successfully completed. PN CNT HG -- ---------- ------------------------------ p1 6106 ***************************** p2 6178 ***************************** p3 6163 ***************************** p4 6019 **************************** p5 6042 **************************** p6 6010 **************************** p7 6264 ****************************** p8 6089 ***************************** 8 rows selected.
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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 xxvi
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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 75 ops$tkyte@OR
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CHAPTER 3 ■ FILES 77 • To maint
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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 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 LATCHING
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CHAPTER 8 ■ ■ ■ Transactions
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CHAPTER 8 ■ TRANSACTIONS 257 •
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284 CHAPTER 9 ■ REDO AND UNDO cri
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298 CHAPTER 9 ■ REDO AND UNDO ops
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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 445 Indicate
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706 ■INDEX autonomous transaction
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