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

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CHAPTER 14 ■ PARALLEL EXECUTION 637 UNIFORM_TEST 5 12800 UNIFORM_TEST 6 12800 UNIFORM_TEST 7 12800 UNIFORM_TEST 8 12800 UNIFORM_TEST 9 12800 UNIFORM_TEST 10 12800 UNIFORM_TEST 11 12800 UNIFORM_TEST 12 12800 UNIFORM_TEST 13 12800 UNIFORM_TEST 14 12800 UNIFORM_TEST 15 12800 16 rows selected. Each extent is 100MB in size. Now, it would be a waste of paper to list all 714 extents, so let’s look at them in aggregate: ops$tkyte@ORA10GR1> select segment_name, blocks, count(*) 2 from user_extents 3 where segment_name = 'AUTOALLOCATE_TEST' 4 group by segment_name, blocks 5 / SEGMENT_NAME BLOCKS COUNT(*) ----------------- ---------- ---------- AUTOALLOCATE_TEST 8 128 AUTOALLOCATE_TEST 128 504 AUTOALLOCATE_TEST 240 1 AUTOALLOCATE_TEST 392 1 AUTOALLOCATE_TEST 512 1 AUTOALLOCATE_TEST 656 1 AUTOALLOCATE_TEST 752 5 AUTOALLOCATE_TEST 768 1 AUTOALLOCATE_TEST 1024 72 9 rows selected. This generally fits in with how LMTs with AUTOALLOCATE are observed to allocate space. The 8, 128, and 1,024 block extents are “normal”; we will observe them all of the time with AUTOALLOCATE. The rest, however, are not “normal”; we do not usually observe them. They are due to the extent trimming that takes place. Some of the parallel execution servers finished their part of the load—they took their last 8MB (1,024 blocks) extent and trimmed it, resulting in a spare bit left over. One of the other parallel execution sessions, as it needed space, could use this spare bit. In turn, as these other parallel execution sessions finished processing their own loads, they would trim their last extent and leave spare bits of space. Which approach should you use? If your goal is to direct path load in parallel as often as possible, I suggest AUTOALLOCATE as your extent management policy. Parallel direct path operations like this will not use use space under the object’s HWM—the space on the freelist. Unless
638 CHAPTER 14 ■ PARALLEL EXECUTION you do some conventional path inserts into these tables also, UNIFORM allocation will permanently have additional free space in it that it will never use. Unless you can size the extents for the UNIFORM LMT to be much smaller, you will see what I term excessive wastage over time— and remember that this space is associated with the segment and will be included in a full scan of the table. To demonstrate this, let’s do another parallel direct path load into these existing tables, using the same inputs: ops$tkyte@ORA10GR1> alter session enable parallel dml; Session altered. ops$tkyte@ORA10GR1> insert /*+ append */ into UNIFORM_TEST 2 select * from big_table_et; 10000000 rows created. ops$tkyte@ORA10GR1> insert /*+ append */ into AUTOALLOCATE_TEST 2 select * from big_table_et; 10000000 rows created. ops$tkyte@ORA10GR1> commit; Commit complete. If we compare the space utilization of the two tables after that operation as follows: ops$tkyte@ORA10GR1> exec show_space( 'UNIFORM_TEST' ); Free Blocks............................. 118,463 Total Blocks............................ 409,600 Total Bytes............................. 3,355,443,200 Total MBytes............................ 3,200 Unused Blocks........................... 0 Unused Bytes............................ 0 Last Used Ext FileId.................... 6 Last Used Ext BlockId................... 281,609 Last Used Block......................... 12,800 PL/SQL procedure successfully completed. ops$tkyte@ORA10GR1> exec show_space( 'AUTOALLOCATE_TEST' ); Free Blocks............................. 48 Total Blocks............................ 291,184 Total Bytes............................. 2,385,379,328 Total MBytes............................ 2,274 Unused Blocks........................... 0 Unused Bytes............................ 0 Last Used Ext FileId.................... 8 Last Used Ext BlockId................... 140,025 Last Used Block......................... 8 PL/SQL procedure successfully completed.
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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 89 A Brief Revi
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CHAPTER 4 ■ ■ ■ Memory Struct
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CHAPTER 4 ■ MEMORY STRUCTURES 117
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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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284 CHAPTER 9 ■ REDO AND UNDO cri
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338 CHAPTER 10 ■ DATABASE TABLES
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CHAPTER 11 ■ ■ ■ Indexes Inde
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Apress.Expert.Oracle.Database.Architecture.9i.and.10g.Programming.Techniques.and.Solutions.Sep.2005

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