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

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CHAPTER 3 ■ FILES 81 3 l_dummy number; 4 begin 5 l_dummy := dbms_utility.get_parameter_value 6 ( 'background_dump_dest', l_dummy, l_string ); 7 dbms_output.put_line( 'background: ' || l_string ); 8 l_dummy := dbms_utility.get_parameter_value 9 ( 'user_dump_dest', l_dummy, l_string ); 10 dbms_output.put_line( 'user: ' || l_string ); 11 end; 12 / background: /home/ora10g/admin/ora10g/bdump user: /home/ora10g/admin/ora10g/udump PL/SQL procedure successfully completed. Naming Convention The trace file naming convention changes from time to time in Oracle, but if you have an example of a trace file name from your system, it is easy to see the template in use. For example, on my various servers, a trace file name looks as shown in Table 3-1. Table 3-1. Sample Trace File Names Trace File Name Platform Database Version ora10g_ora_24574.trc Linux 10g Release 1 ora9ir2_ora_24628.trc Linux 9i Release 2 ora_10583.trc Linux 9i Release 1 ora9ir2w_ora_688.trc Windows 9i Release 2 ora10g_ora_1256.trc Windows 10g Release 1 On my servers, the trace file name can be broken down as follows: • The first part of the file name is the ORACLE_SID (with the exception of Oracle9i Release 1, where Oracle decided to leave that off). • The next bit of the file name is just ora. • The number in the trace file name is the process ID of your dedicated server, available to you from the V$PROCESS view. Therefore, in practice (assuming dedicated server mode), you need access to four views: • V$PARAMETER: To locate the trace file for USER_DUMP_DEST • V$PROCESS: To find the process ID • V$SESSION: To correctly identify your session’s information in the other views • V$INSTANCE: To get the ORACLE_SID
82 CHAPTER 3 ■ FILES As noted earlier, you can use DBMS_UTILITY to find the location, and often you simply “know” the ORACLE_SID, so technically you need access to V$SESSION and V$PROCESS only, but for ease of use you would want access to all four. A query, then, to generate your trace file name would be ops$tkyte@ORA10G> alter session set sql_trace=true; Session altered. ops$tkyte@ORA10G> select c.value || '/' || d.instance_name || 2 '_ora_' || a.spid || '.trc' trace 3 from v$process a, v$session b, v$parameter c, v$instance d 4 where a.addr = b.paddr 5 and b.audsid = userenv('sessionid') 6 and c.name = 'user_dump_dest' 7 / TRACE ------------------------------------------------------------------------------- /home/ora10g/admin/ora10g/udump/ora10g_ora_24667.trc ops$tkyte@ORA10G> It should be obvious that on Windows you would replace the / with \. If you are using 9i Release 1, you would simply issue the following, instead of adding the instance name into the trace file name: select c.value || 'ora_' || a.spid || '.trc' Tagging Trace Files There is a way to “tag” your trace file so that you can find it even if you are not permitted access to V$PROCESS and V$SESSION. Assuming you had access to read the USER_DUMP_DEST directory, you can use the session parameter TRACEFILE_IDENTIFIER. Using this, you may add a uniquely identifiable string to the trace file name, for example: ops$tkyte@ORA10G> alter session set tracefile_identifier = 'Look_For_Me'; Session altered. ops$tkyte@ORA10G> alter session set sql_trace=true; Session altered. ops$tkyte@ORA10G> !ls /home/ora10g/admin/ora10g/udump/*Look_For_Me* /home/ora10g/admin/ora10g/udump/ora10g_ora_24676_Look_For_Me.trc ops$tkyte@ORA10G> As you can see, the trace file is now named in the standard _ora_ format, but it also has the unique string we specified associated with it, making it rather easy to find “our” trace file name.
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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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CHAPTER 1 ■ DEVELOPING SUCCESSFUL
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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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CHAPTER 8 ■ TRANSACTIONS 257 •
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CHAPTER 8 ■ TRANSACTIONS 259 So,
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CHAPTER 8 ■ TRANSACTIONS 265 busi
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284 CHAPTER 9 ■ REDO AND UNDO cri
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286 CHAPTER 9 ■ REDO AND UNDO Fir
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288 CHAPTER 9 ■ REDO AND UNDO The
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292 CHAPTER 9 ■ REDO AND UNDO Wha
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294 CHAPTER 9 ■ REDO AND UNDO row
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296 CHAPTER 9 ■ REDO AND UNDO If
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298 CHAPTER 9 ■ REDO AND UNDO ops
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300 CHAPTER 9 ■ REDO AND UNDO Inv
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314 CHAPTER 9 ■ REDO AND UNDO •
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318 CHAPTER 9 ■ REDO AND UNDO •
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320 CHAPTER 9 ■ REDO AND UNDO bac
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326 CHAPTER 9 ■ REDO AND UNDO wil
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328 CHAPTER 9 ■ REDO AND UNDO Thi
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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 433 if ( (++
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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 11 ■ INDEXES 459 7 l_last
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CHAPTER 11 ■ INDEXES 461 ops$tkyt
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CHAPTER 12 ■ DATATYPES 551 13 dbm
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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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