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When you run an Oracle tool, such as the OEM Database Control or the SQL*Plus interface, you do so through a user process. An Oracle session is a specific connection of a user to the Oracle instance through the Oracle user process. The session duration lasts from the time you connect to the database by providing a username/password combination until you log out. The server process is the process that services an individual user process. Each user connected to the database has a separate server process created for the duration of the session. The server process is created to service the user s process and is used by the user process to communicate with the Oracle database server. When the user submits a request to select data, for example, the server process created for that user s application checks the syntax of the code and executes the SQL code. It then reads the data from the datafiles into the memory blocks. (If another user intends to read the same data, the second user s server process will read it not from disk again, but from Oracle s memory, where the data usually remains for a while.) Finally, the server process returns the requested data to the user process.
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CHAPTER 5 ORAC LE DATABA SE 1 1G AR CHITECTURE
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The number of user processes for each server process depends on the type of server configuration. You can have three types of server configuration, as explained here: Dedicated server configuration: The most common configuration for the server process is to assign each user a dedicated server process. Under the dedicated server process approach, each user has a one-to-one connection to the database through a dedicated server process. Shared server configuration: Multiple user processes share a server process. When you use the shared server architecture, several users connect through a dispatcher and use a shared server process. Even though the dedicated server approach is most commonly used, is easier to set up and tune, and is fine in most cases, it s better under some circumstances to use a shared server process, which helps conserve critical system resources, such as memory. When you use a shared server configuration, you can also configure shared server connection pooling. Connection pooling lets you reuse existing timed-out connections to service other active sessions. You can also configure shared server session multiplexing, which combines multiple sessions for transmission over the same network connection. Database resident connection pooling (DRCP): This connection method, introduced in the Oracle Database 11g release, is useful for applications that must maintain persistent connection to the database, which leads to an increased demand on server resources. DRCP lets you set up pooled dedicated connections across applications and processes. When a client requires a connection to the database, a connection broker, instead of the dedicated server, will connect the client to the database. The connection broker is in charge of managing client connections, by allocating servers from a pool of dedicated servers. The connection broker hooks up the client connection to a dedicated server, and once the client s request is fulfilled, the dedicated server is returned to the pool of available servers. I explain the important Oracle connection methods, including the new DRCP method, in 11.
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The background processes are the real workhorses of the Oracle instance they enable large numbers of users to concurrently and efficiently use information stored in database files. Oracle creates these processes automatically when you start an instance, and by being continuously hooked into the operating system, these processes relieve the Oracle software from having to repeatedly start numerous, separate processes for the various tasks that need to be done on the operating system s server. Each of the Oracle background processes is in charge of a separate task, thus increasing the efficiency of the database instance. These processes are automatically created by Oracle when you start the database instance, and they terminate when the database is shut down. Table 5-1 lists the key Oracle background processes. There are other specialized background processes that you ll need to use only if you re implementing certain advanced Oracle features.
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