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

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■SETTING UP YOUR ENVIRONMENT xxxiii 8 procedure rs_start 9 is 10 begin 11 delete from run_stats; 12 13 insert into run_stats 14 select 'before', stats.* from stats; 15 16 g_start := dbms_utility.get_time; 17 end; 18 Next is the RS_MIDDLE routine. This procedure simply records the elapsed time for the first run of our test in G_RUN1. Then it inserts the current set of statistics and latches. If we were to subtract these values from the ones we saved previously in RS_START, we could discover how many latches the first method used, how many cursors (a statistic) it used, and so on. Last, it records the start time for our next run: 19 procedure rs_middle 20 is 21 begin 22 g_run1 := (dbms_utility.get_time-g_start); 23 24 insert into run_stats 25 select 'after 1', stats.* from stats; 26 g_start := dbms_utility.get_time; 27 28 end; 29 30 procedure rs_stop(p_difference_threshold in number default 0) 31 is 32 begin 33 g_run2 := (dbms_utility.get_time-g_start); 34 35 dbms_output.put_line 36 ( 'Run1 ran in ' || g_run1 || ' hsecs' ); 37 dbms_output.put_line 38 ( 'Run2 ran in ' || g_run2 || ' hsecs' ); 39 dbms_output.put_line 40 ( 'run 1 ran in ' || round(g_run1/g_run2*100,2) || 41 '% of the time' ); 42 dbms_output.put_line( chr(9) ); 43 44 insert into run_stats 45 select 'after 2', stats.* from stats; 46 47 dbms_output.put_line 48 ( rpad( 'Name', 30 ) || lpad( 'Run1', 10 ) ||
xxxiv ■SETTING UP YOUR ENVIRONMENT 49 lpad( 'Run2', 10 ) || lpad( 'Diff', 10 ) ); 50 51 for x in 52 ( select rpad( a.name, 30 ) || 53 to_char( b.value-a.value, '9,999,999' ) || 54 to_char( c.value-b.value, '9,999,999' ) || 55 to_char( ( (c.value-b.value)-(b.value-a.value)), '9,999,999' ) data 56 from run_stats a, run_stats b, run_stats c 57 where a.name = b.name 58 and b.name = c.name 59 and a.runid = 'before' 60 and b.runid = 'after 1' 61 and c.runid = 'after 2' 62 and (c.value-a.value) > 0 63 and abs( (c.value-b.value) - (b.value-a.value) ) 64 > p_difference_threshold 65 order by abs( (c.value-b.value)-(b.value-a.value)) 66 ) loop 67 dbms_output.put_line( x.data ); 68 end loop; 69 70 dbms_output.put_line( chr(9) ); 71 dbms_output.put_line 72 ( 'Run1 latches total versus runs -- difference and pct' ); 73 dbms_output.put_line 74 ( lpad( 'Run1', 10 ) || lpad( 'Run2', 10 ) || 75 lpad( 'Diff', 10 ) || lpad( 'Pct', 8 ) ); 76 77 for x in 78 ( select to_char( run1, '9,999,999' ) || 79 to_char( run2, '9,999,999' ) || 80 to_char( diff, '9,999,999' ) || 81 to_char( round( run1/run2*100,2 ), '999.99' ) || '%' data 82 from ( select sum(b.value-a.value) run1, sum(c.value-b.value) run2, 83 sum( (c.value-b.value)-(b.value-a.value)) diff 84 from run_stats a, run_stats b, run_stats c 85 where a.name = b.name 86 and b.name = c.name 87 and a.runid = 'before' 88 and b.runid = 'after 1' 89 and c.runid = 'after 2' 90 and a.name like 'LATCH%' 91 ) 92 ) loop 93 dbms_output.put_line( x.data ); 94 end loop; 95 end;
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 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 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 83 Trace Files
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CHAPTER 3 ■ FILES 85 _qerixAlloca
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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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CHAPTER 6 ■ LOCKING AND LATCHING
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CHAPTER 8 ■ TRANSACTIONS 275 Auto
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CHAPTER 8 ■ TRANSACTIONS 281 scot
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284 CHAPTER 9 ■ REDO AND UNDO cri
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314 CHAPTER 9 ■ REDO AND UNDO •
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318 CHAPTER 9 ■ REDO AND UNDO •
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332 CHAPTER 9 ■ REDO AND UNDO Whe
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336 CHAPTER 9 ■ REDO AND UNDO tou
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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 425 One of t
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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 437 When Sho
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CHAPTER 11 ■ INDEXES 439 an 8KB b
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CHAPTER 11 ■ INDEXES 441 select *
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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 451 9 1, 'M'
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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 12 ■ ■ ■ Datatypes Ch
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CHAPTER 12 ■ DATATYPES 513 ■Not
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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 547 buffer
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CHAPTER 12 ■ DATATYPES 549 Note t
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CHAPTER 12 ■ DATATYPES 551 13 dbm
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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 14 ■ ■ ■ Parallel Exe
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706 ■INDEX autonomous transaction
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