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

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CHAPTER 14 ■ PARALLEL EXECUTION 635 3 tablespace lmt_auto 4 as 5 select * from big_table_et; Table created. On my system, which has four CPUs, these CREATE TABLE statements executed with eight parallel execution servers and one coordinator. I verified that was the case by querying one of the dynamic performance views related to parallel execution, V$PX_SESSION, while these statements were running: sys@ORA10GR1> select sid, serial#, qcsid, qcserial#, degree 2 from v$px_session; SID SERIAL# QCSID QCSERIAL# DEGREE ---------- ---------- ---------- ---------- ---------- 137 17 154 998 8 139 13 154 998 8 141 17 154 998 8 150 945 154 998 8 161 836 154 998 8 138 8 154 998 8 147 15 154 998 8 143 41 154 998 8 154 998 154 9 rows selected. ■Note In creating the UNIFORM_TEST and AUTOALLOCATE_TEST tables, we simply specified “parallel” on each table, with Oracle choosing the degree of parallelism. In this case, I was the sole user of the machine (all resources available) and Oracle defaulted it to 8 based on the number of CPUs (four) and the PARALLEL_THREADS_PER_CPU parameter setting, which defaults to 2. The SID,SERIAL# are the identifiers of the parallel execution sessions, and the QCSID,QCSERIAL# is the identifier of the query coordinator of the parallel execution. So, with eight parallel execution sessions running, we would like to see how the space was used. A quick query against USER_SEGMENTS gives us a good idea: ops$tkyte@ORA10GR1> select segment_name, blocks, extents 2 from user_segments 3 where segment_name in ( 'UNIFORM_TEST', 'AUTOALLOCATE_TEST' ); SEGMENT_NAME BLOCKS EXTENTS --------------- ---------- ---------- UNIFORM_TEST 204800 16 AUTOALLOCATE_TEST 145592 714
636 CHAPTER 14 ■ PARALLEL EXECUTION Since we were using an 8KB blocksize, that shows a difference of about 462MB, or looking at it from ratio perspective, AUTOALLOCATE_TEST is about 70 percent the size of UNIFORM_TEST as far as allocated space goes. If we look at the actual used space, ops$tkyte@ORA10GR1> exec show_space('UNIFORM_TEST' ); Free Blocks............................. 59,224 Total Blocks............................ 204,800 Total Bytes............................. 1,677,721,600 Total MBytes............................ 1,600 Unused Blocks........................... 0 Unused Bytes............................ 0 Last Used Ext FileId.................... 6 Last Used Ext BlockId................... 9 Last Used Block......................... 12,800 PL/SQL procedure successfully completed. ops$tkyte@ORA10GR1> exec show_space('AUTOALLOCATE_TEST' ); Free Blocks............................. 16 Total Blocks............................ 145,592 Total Bytes............................. 1,192,689,664 Total MBytes............................ 1,137 Unused Blocks........................... 0 Unused Bytes............................ 0 Last Used Ext FileId.................... 8 Last Used Ext BlockId................... 41 Last Used Block......................... 8 PL/SQL procedure successfully completed. ■Note The SHOW_SPACE procedure is described in the “Setting Up” section at the beginning of this book. we can see that if we take away the blocks on the freelist for UNIFORM_TEST—59,224 of them— the tables consume about the same amount of actual space, but the amount of space needed by the UNIFORM tablespace is considerably more. This is all due to the extent trimming that did not take place. It we look at UNIFORM_TEST, we see this clearly: ops$tkyte@ORA10GR1> select segment_name, extent_id, blocks 2 from user_extents where segment_name = 'UNIFORM_TEST'; SEGMENT_NAME EXTENT_ID BLOCKS --------------- ---------- ---------- UNIFORM_TEST 0 12800 UNIFORM_TEST 1 12800 UNIFORM_TEST 2 12800 UNIFORM_TEST 3 12800 UNIFORM_TEST 4 12800
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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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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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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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