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

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CHAPTER 9 ■ REDO AND UNDO 305 ops$tkyte@ORA10G> create or replace trigger after_insert_update_delete 2 after insert or update or delete on T 3 for each row 4 begin 5 null; 6 end; 7 / Trigger created. ops$tkyte@ORA10G> truncate table t; Table truncated. ops$tkyte@ORA10G> exec do_work( 'after trigger' ); insert redo size = 505972 rows = 200 2,529.9 bytes/row update redo size = 856636 rows = 200 4,283.2 bytes/row delete redo size = 474176 rows = 200 2,370.9 bytes/row PL/SQL procedure successfully completed. The preceding output was from a run where the size of Y was 2,000 bytes. After all of the runs were complete, we are able to query the LOG table and see the following: ops$tkyte@ORA10G> break on op skip 1 ops$tkyte@ORA10G> set numformat 999,999 ops$tkyte@ORA10G> select op, rowsize, no_trig, before_trig-no_trig, after_trig-no_trig 2 from 3 ( select op, rowsize, 4 sum(decode( what, 'no trigger', redo_size/rowcnt,0 ) ) no_trig, 5 sum(decode( what, 'before trigger', redo_size/rowcnt, 0 ) ) before_trig, 6 sum(decode( what, 'after trigger', redo_size/rowcnt, 0 ) ) after_trig 7 from log 8 group by op, rowsize 9 ) 10 order by op, rowsize 11 / OP ROWSIZE NO_TRIG BEFORE_TRIG-NO_TRIG AFTER_TRIG-NO_TRIG ---------- -------- -------- ------------------- ------------------------ delete 30 291 0 0 100 364 -1 -0 500 785 -0 0 1,000 1,307 -0 -0 2,000 2,371 0 -0
306 CHAPTER 9 ■ REDO AND UNDO insert 30 296 0 -0 100 367 0 0 500 822 1 1 1,000 1,381 -0 -0 2,000 2,530 0 0 update 30 147 358 152 100 288 363 157 500 1,103 355 150 1,000 2,125 342 137 2,000 4,188 300 94 15 rows selected. Now, I was curious if the log mode (ARCHIVELOG versus NOARCHIVELOG mode) would affect these results. I discovered that the answer is no, the numbers were identical in both modes. I was curious about why the results were very different from the first edition of Expert One-on- One Oracle, upon which this book you are reading is loosely based. That book was released when Oracle8i version 8.1.7 was current. The Oracle 10g results just shown differed greatly from Oracle8i, but the Oracle9i results shown in this table resembled the Oracle8i results closely: OP ROWSIZE NO_TRIG BEFORE_TRIG-NO_TRIG AFTER_TRIG-NO_TRIG ---------- -------- -------- ------------------- ------------------ delete 30 279 -0 -0 100 351 -0 -0 500 768 1 0 1,000 1,288 0 0 2,000 2,356 0 -11 insert 30 61 221 221 100 136 217 217 500 599 199 198 1,000 1,160 181 181 2,000 2,311 147 147 update 30 302 197 0 100 438 197 0 500 1,246 195 0 1,000 2,262 185 0 2,000 4,325 195 -1 15 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 xxix
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■SETTING UP YOUR ENVIRONMENT xxxi
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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 69 and even dat
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CHAPTER 3 ■ FILES 71 all operatio
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CHAPTER 3 ■ FILES 73 *.cluster_da
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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 83 Trace Files
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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 95 dictionary t
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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 11 ■ ■ ■ Indexes Inde
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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 445 Indicate
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CHAPTER 12 ■ DATATYPES 499 Table
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CHAPTER 12 ■ DATATYPES 515 Coping
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CHAPTER 12 ■ DATATYPES 521 Format
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CHAPTER 12 ■ DATATYPES 553 equall
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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 563 BIG
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CHAPTER 13 ■ PARTITIONING 565 Enh
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CHAPTER 13 ■ PARTITIONING 567 Tab
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CHAPTER 13 ■ PARTITIONING 569 tha
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CHAPTER 13 ■ PARTITIONING 609 Row
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CHAPTER 13 ■ PARTITIONING 611 So,
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