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

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■SETTING UP YOUR ENVIRONMENT xxxvii where a.statistic# = b.statistic# and lower(a.name) like '%' || lower('&S')||'%' / set echo on For example, to see how much redo is generated by some UPDATE, we can do the following: big_table@ORA10G> @mystat "redo size" big_table@ORA10G> set echo off NAME VALUE ------------------------------ ---------- redo size 496 big_table@ORA10G> update big_table set owner = lower(owner) 2 where rownum @mystat2 big_table@ORA10G> set echo off NAME V DIFF ------------------------------ ---------- ---------------- redo size 89592 89,096 That shows our UPDATE of 1,000 rows generated 89,096 bytes of redo. SHOW_SPACE The SHOW_SPACE routine prints detailed space utilization information for database segments. Here is the interface to it: ops$tkyte@ORA10G> desc show_space PROCEDURE show_space Argument Name Type In/Out Default? ------------------------------ ----------------------- ------ -------- P_SEGNAME VARCHAR2 IN P_OWNER VARCHAR2 IN DEFAULT P_TYPE VARCHAR2 IN DEFAULT P_PARTITION VARCHAR2 IN DEFAULT The arguments are as follows: • P_SEGNAME: Name of the segment (e.g., the table or index name). • P_OWNER: Defaults to the current user, but you can use this routine to look at some other schema.
xxxviii ■SETTING UP YOUR ENVIRONMENT • P_TYPE: Defaults to TABLE and represents the type of object you are looking at. For example, SELECT DISTINCT SEGMENT_TYPE FROM DBA_SEGMENTS lists valid segment types. • P_PARTITION: Name of the partition when you show the space for a partitioned object. SHOW_SPACE shows space for only one partition at a time. The output of this routine looks as follows, when the segment resides in an Automatic Segment Space Management (ASSM) tablespace: big_table@ORA10G> exec show_space('BIG_TABLE'); Unformatted Blocks ..................... 0 FS1 Blocks (0-25) ..................... 0 FS2 Blocks (25-50) ..................... 0 FS3 Blocks (50-75) ..................... 0 FS4 Blocks (75-100)..................... 0 Full Blocks ..................... 14,469 Total Blocks............................ 15,360 Total Bytes............................. 125,829,120 Total MBytes............................ 120 Unused Blocks........................... 728 Unused Bytes............................ 5,963,776 Last Used Ext FileId.................... 4 Last Used Ext BlockId................... 43,145 Last Used Block......................... 296 PL/SQL procedure successfully completed. The items reported are as follows: • Unformatted Blocks: The number of blocks that are allocated to the table and are below the high-water mark (HWM), but have not been used. Add unformatted and unused blocks together to get a total count of blocks allocated to the table but never used to hold data in an ASSM object. • FS1 Blocks–FS4 Blocks: Formatted blocks with data. The ranges of numbers after their name represent the “emptiness” of each block. For example, (0–25) is the count of blocks that are between 0 and 25 percent empty. • Full Blocks: The number of blocks so full that they are no longer candidates for future inserts. • Total Blocks, Total Bytes, Total MBytes: The total amount of space allocated to the segment measured in database blocks, bytes, and megabytes. • Unused Blocks, Unused Bytes: These represent a portion of the amount of space never used. These blocks are allocated to the segment but are currently above the HWM of the segment. • Last Used Ext FileId: The file ID of the file that contains the last extent that contains data.
Page 2 and 3: Expert Oracle Database Architecture
Page 4 and 5: Contents Foreword . . . . . . . . .
Page 6 and 7: ■CONTENTS v Block Buffer Cache .
Page 8 and 9: ■CONTENTS vii ■CHAPTER 9 Redo a
Page 10 and 11: ■CONTENTS ix ■CHAPTER 12 Dataty
Page 12 and 13: Foreword “THINK.” In 1914, Thom
Page 14 and 15: ■FOREWORD xiii Tom is an aficiona
Page 16 and 17: About the Technical Reviewers ■JO
Page 18 and 19: Introduction The inspiration for th
Page 20 and 21: ■INTRODUCTION xix • Exposure to
Page 22 and 23: ■INTRODUCTION xxi Chapter 3: File
Page 24 and 25: ■INTRODUCTION xxiii Next up are t
Page 26 and 27: Setting Up Your Environment In this
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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 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 4 ■ MEMORY STRUCTURES 117
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CHAPTER 5 ■ ORACLE PROCESSES 157
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284 CHAPTER 9 ■ REDO AND UNDO cri
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318 CHAPTER 9 ■ REDO AND UNDO •
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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 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 439 an 8KB b
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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 11 ■ INDEXES 453 column w
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CHAPTER 11 ■ INDEXES 455 Bitmap j
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CHAPTER 11 ■ INDEXES 457 INSERT a
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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 563 BIG
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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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