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

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CHAPTER 5 ■ ORACLE PROCESSES 163 3 where username = USER 4 / USERNAME SID SERIAL# SERVER PADDR STATUS --------- ---- -------- --------- -------- -------- OPS$TKYTE 150 233 DEDICATED AE4CF614 ACTIVE So, notice that we have the same PADDR, so we are using the same physical connection, but that we have (potentially) a different SID. I say “potentially” because we could get assigned the same SID—it just depends on whether other people logged in while we were logged out and whether the original SID we had was available. So far, these tests were performed using a dedicated server connection, so the PADDR was the process address of our dedicated server process. What happens if we use a shared server? ■Note To connect via shared server, your database instance would have to have been started with the necessary setup. Coverage of how to configure shared server is beyond the scope of this book, but this topic is explored in detail in Oracle Net Services Administrator’s Guide. Well, let’s log in using shared server and in that session query: ops$tkyte@ORA10G> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = 'OPS$TKYTE' 6 / USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- --- ------- ------- -------- ------ ---------------------- OPS$TKYTE 150 261 SHARED AE4CF118 ACTIVE oracle@localhost(S000) Our shared server connection is associated with a process—the PADDR is there and we can join to V$PROCESS to pick up the name of this process. In this case, we see it is a shared server, as identified by the text S000. However, if we use another SQL*Plus window to query this same bit of information, while leaving our shared server session idle, we see something like this: sys@ORA10G> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = 'OPS$TKYTE' 6 /
164 CHAPTER 5 ■ ORACLE PROCESSES USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- --- ------- ------ -------- -------- ----------------------- OPS$TKYTE 150 261 NONE AE4CEC1C INACTIVE oracle@localhost(D000) Notice that our PADDR is different and the name of the process we are associated with has also changed. Our idle shared server connection is now associated with a dispatcher, D000. Hence we have yet another method for observing multiple sessions pointing to a single process. A dispatcher could have hundreds, or even thousands, of sessions pointing to it. An interesting attribute of shared server connections is that the shared server process we use can change from call to call. If I were the only one using this system (as I am for these tests), running that query over and over as OPS$TKYTE would tend to produce the same PADDR of AE4CF118 over and over. However, if I were to open up more shared server connections and start to use that shared server in other sessions, then I might notice that the shared server I use varies. Consider this example. I’ll query my current session information, showing the shared server I’m using. Then in another shared server session, I’ll perform a long-running operation (i.e., I’ll monopolize that shared server). When I ask the database what shared server I’m using again, I’ll most likely see a different one (if the original one is off servicing the other session). In the following example, the code in bold represents a second SQL*Plus session that was connected via shared server: ops$tkyte@ORA10G> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = 'OPS$TKYTE' 6 / USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- --- ------- ------- -------- ------ ---------------------- OPS$TKYTE 150 261 SHARED AE4CF118 ACTIVE oracle@localhost(S000) sys@ORA10G> connect system/manager@shared_server.us.oracle.com Connected. system@ORA10G> exec dbms_lock.sleep(20) ops$tkyte@ORA10G> select a.username, a.sid, a.serial#, a.server, 2 a.paddr, a.status, b.program 3 from v$session a left join v$process b 4 on (a.paddr = b.addr) 5 where a.username = 'OPS$TKYTE' 6 / USERNAME SID SERIAL# SERVER PADDR STATUS PROGRAM --------- --- ------- ------ -------- ------ ------- OPS$TKYTE 150 261 SHARED AE4CF614 ACTIVE oracle@localhost(S001)
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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 11 ■ ■ ■ Indexes Inde
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CHAPTER 11 ■ INDEXES 431 The data
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CHAPTER 11 ■ INDEXES 445 Indicate
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CHAPTER 13 ■ ■ ■ Partitioning
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