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4: Oracle Networking
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Ensure that all work from now is done from a session where the variable has been set On Windows:
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mkdir d:\oracle\net
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PART I
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Create and set the key TNS_ADMIN as a string variable in the registry in the Oracle Home branch This will typically be
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HKEY_LOCAL_MACHINE\SOFTWARE\ORACLE\KEY_OraDb11g_home1
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2 Check that the variable is being read by using the TNSPING command from an operating system prompt:
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This will return an error TNS-03505: Failed to resolve name because there are no files in the TNS_ADMIN directory On Windows, you may need to launch a new command prompt to pick up the new TNS_ADMIN value from the registry 3 Start the Net Manager On Linux, run netmgr from an operating system prompt; on Windows, launch it from the Start menu The top line of the Net Manager window will show the location of the Oracle Net files If this is not the new directory, then the TNS_ADMIN variable has not been set correctly 4 Create a new listener: expand the Local branch of the navigation tree, highlight Listeners, and click the + icon 5 Enter a listener name, NEWLIST, and click OK 6 Click Add Address 7 For Address 1, choose TCP/IP as the protocol and enter 127001 as the host, 2521 as the port The illustration that follows shows the result
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OCA/OCP Oracle Database 11g All-in-One Exam Guide
8 Create a new service name: highlight Service Naming in the navigation tree, and click the + icon 9 Enter NEW as the net service name, and click Next 10 Select TCP/IP as the protocol, and click Next 11 Enter 127001 as the host name and 2521 as the port and click Next 12 Enter SERV1 as the service name, and click Next 13 Click Finish If you try the test, it will fail at this time The illustration that follows shows the result
14 Save the configuration by clicking File and Save Network Configuration This will create the listenerora and tnsnamesora files in the TNS_ADMIN directory 15 Use an editor to check the two files They will look like this: LISTENERORA:
NEWLIST = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 127001)(PORT = 2521)) )
TNSNAMESora:
NEW = (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = 127001)(PORT = 2521)) ) (CONNECT_DATA = (SERVICE_NAME = SERV1) ) )
4: Oracle Networking
16 From an operating system prompt, start the listener with lsnrctl start newlist 17 From an operating system prompt, test the connect string with tnsping new 18 Connect to your database using operating system authentication, bypassing any listener, with sqlplus / as sysdba 19 Set the service_names and local_listener parameters for the running instance (memory only, not the parameter file) and register the new service name with the new listener:
alter system set service_names=serv1 scope=memory; alter system set local_listener=new scope=memory; alter system register;
PART I
20 From an operating system prompt, confirm that the new service has registered with the new listener with lsnrctl services newlist 21 Confirm that the new network environment is functional by logging on:
sqlplus system/oracle@new
Use the Oracle Shared Server Architecture
The standard dedicated server architecture requires that the database listener should spawn a dedicated server process for each concurrent connection to the instance These server processes will persist until the session is terminated On Unix-type platforms, the server processes are real operating system processes; on Windows, they are threads within the one ORACLEEXE process This architecture does not scale easily to support a large number of user processes on some platforms An alternative is the shared server architecture, known as the multithreaded server (or MTS) in earlier releases
The Limitations of Dedicated Server Architecture
As more users log on to your instance, more server processes get launched This is not a problem as far as Oracle is concerned The database listener can launch as many processes as required, though there may be limits on the speed with which it can launch them If you have a large number of concurrent connection requests, your listener will have to queue them up You can avoid this by running multiple listeners on different ports, and load-balancing between them Then once the sessions are established, there is no limit to the number that PMON can manage But your operating system may well have limits on the number of processes that it can support, limits to do with context switches and with memory A computer can only do one thing at once unless it is an SMP machine, in which case each CPU can only do one thing at once The operating system simulates concurrent processing by using an algorithm to share CPU cycles across all the currently executing processes This algorithm, often referred to as a time slicing or time sharing algorithm, takes care of allocating a few CPU cycles to each process in turn The switch of taking one process off CPU in order to put another process on CPU is called a context switch Context switches are very expensive: the operating system has to do a lot of work to
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