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CHAPTER 5 ORACLE PROCESSES
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Note There are many variants of the fork() and exec() calls, such as vfork() and execve(). The call used
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by Oracle may vary by operating system and implementation, but the net effect is the same. fork() creates a new process that is a clone of the parent process; on UNIX, this is the only way to create a new process. exec() loads a new program image over the existing program image in memory, thus starting a new program. So, SQL*Plus can fork (copy itself) and then exec the Oracle binary, the dedicated server, overlaying the copy of itself with this new program.
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We can see this parent/child process creation clearly on UNIX when we run the client and server on the same machine: $ sqlplus / SQL*Plus: Release 11.2.0.1.0 Production on Sun Jan 24 07:28:13 2010 Copyright (c) 1982, 2009, Oracle. All rights reserved.
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Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production With the Partitioning, OLAP, Data Mining and Real Application Testing options ops$tkyte%ORA11GR2> select a.spid dedicated_server, 2 b.process clientpid 3 from v$process a, v$session b 4 where a.addr = b.paddr 5 and b.sid = (select sid from v$mystat where rownum=1) 6 / DEDICATED_SERVER CLIENTPID ------------------------ -----------------------19168 19167 ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> !/bin/ps -fp 19168 UID PID PPID C STIME TTY tkyte 19167 19166 0 07:30 pts/2 ora11gr2 19168 19167 0 07:30 19167 STAT Ss+ Ss
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TIME CMD 0:00 /home/ora11gr2/app/ /bin/sqlplus 0:00 oracleorcl (DESCRIPTION=(LOCAL=
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Here, I used a query to discover the process ID (PID) associated with my dedicated server (the SPID from V$PROCESS is the operating system PID of the process that was being used during the execution of that query). The output of /bin/ps fp includes the parent process id (PPID) and shows the dedicated server process, 19168, is the child of my SQL*Plus process: process id 19167.
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CHAPTER 5 ORACLE PROCESSES
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Shared Server Connections
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Let s now take a look at the shared server process in more detail. This type of connection mandates the use of Oracle Net even if the client and server are on the same machine you cannot use shared server without using the Oracle TNS listener. As described earlier, the client application will connect to the Oracle TNS listener and will be redirected or handed off to a dispatcher. The dispatcher acts as the conduit between the client application and the shared server process. Figure 5-2 is a diagram of the architecture of a shared server connection to the database.
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Figure 5-2. Typical shared server connection Here, we can see that the client applications, with the Oracle libraries linked in, will be physically connected to a dispatcher process. We may have many dispatchers configured for any given instance, but it is not uncommon to have just one dispatcher for many hundreds even thousands of users. The dispatcher is simply responsible for receiving inbound requests from the client applications and putting them into a request queue in the SGA. The first available shared server process from the pool of precreated shared server processes will pick up the request from the queue and attach the UGA of the associated session (the boxes labeled S in Figure 5-2). The shared server will process that request and place any output from it into the response queue. The dispatcher constantly monitors the response queue for results and transmits them back to the client application. As far as the client is concerned, it can t really tell if it is connected via a dedicated server or a shared connection they appear to be the same. Only at the database level is the difference apparent.
CHAPTER 5 ORACLE PROCESSES
Database Resident Connection Pooling (DRCP)
Database Resident Connection Pooling (DRCP) is an optional, new method of connecting to the database and establishing a session. It is designed as a more efficient method of connection pooling for application interfaces that do not support efficient connection pooling natively such as PHP, a general purpose web scripting language. DRCP is a mixture of dedicated server and shared server concepts. It inherits from shared server the concept of server process pooling, only the processes being pooled will be dedicated servers not shared servers; it inherits from the dedicated server the concept of well being dedicated. In a shared server connection, the shared server process is shared among many sessions and a single session will tend to use many shared servers. With DRCP, this is not true; the dedicated server process that is selected from the pool will become dedicated to the client process for the life of its session. In shared server, if I execute three statements against the database in my session, there is a good chance that the three statements will be executed by three different shared server processes. Using DRCP, those same three statements would be executed by the dedicated server assigned to me from the pool that dedicated server would be mine until my session releases it back to the pool. So DRCP has the pooling capabilities of shared server and the performance characteristics of dedicated server. We ll explore performance of dedicated versus shared server more below.)
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