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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 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, which is basically the same as a dedicated server process, 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 cannot 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.

Blind interactions apply to both push and pull interactions. Let P1 be the talker or interrogator, and let P2 be the listener or respondent. An interaction is called blind when P1 can t obtain status updates from P2 while P2 is busy processing the command or request. P1 basically issues a command and waits for P2 to execute it. While execution is underway, P1 might go off and do other things. What s important about blind interactions is that P1 can t ask P2 how long the command will take to complete or how far along P2 is in the execution of a command. Both synchronous and asynchronous interactions can be blind.

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nvl(sum(f.free_bytes)/1024/1024,0) free, nvl((sum(e.used_bytes)*100)/sum(df.bytes),0) pct_used, FROM DBA_DATA_FILES df (SELECT file_id SUM(nvl(bytes,0)) used_bytes FROM dba_extents GROUP BY file_id) e, (SELECT MAX(bytes) free_bytes, file_id FROM dba_free_space GROUP BY file_id) f WHERE e.file_id(+) = df.file_id AND df.file_id = f.file_id(+) GROUP BY df.tablespace_name ORDER BY 5 DESC

It surprises many people to discover that a connection is not synonymous with a session. In most people s eyes they are the same, but the reality is they do not have to be. A connection may have zero, one, or more sessions established on it. Each session is separate and independent, even though they all share the same physical connection to the database. A commit in one session does not affect any other session on that connection. In fact, each session using that connection could use different user identities!

Size Used Free Tablespace Name (MB) (MB) (MB) % Used --------------------------------------------------PERSON_INFO_I 2,299 2,245 54 98 PERSONS_I 26348 6,185 162 97 LABELS_I 2,038 1,980 58 97 . . . CBC_I 501 7 490 1 QUEST 10 0 10 1 TEST2 10 0 1 0 --------- -------- ------Grand Total 291,528 224,473 43,602 SQL> The DBA_TEMP_FILES view is analogous to the DBA_DATA_FILES view, and shows the temporary tablespace temp file information.

Java run-time environment were released frequently, adding features like printing, online help, twodimensional graphics, and others. With each new release, Sun Microsystems deprecated certain methods and introduced others. Software written for a newer version of the run time would sometimes fail with an older version, if it called built-in services that the older version didn t support or that had been changed. The problem was due to the platform coupling between the Java components and the Java run-time components. If the software was developed on one version of the run time and deployed on a different version, there was always the potential for problems. The typical solution was to have users upgrade to the version of the Java run time that the system was written for. Newer component platforms, such as the .NET Framework, reduce deployment headaches related to run-time version dependencies by embedding information in each component that identifies which version of the component platform it requires. If the required platform is not available, the run time notifies the user and prevents the affected software from running.

You can use the DBA_TABLESPACES dictionary view to find out important information about a tablespace, including the following: Initial extent size Next extent size Default maximum number of extents Status (online, offline, or read-only) Contents (permanent, temporary, or undo) Type of extent management (DICTIONARY or LOCAL) Segment space management (AUTO or MANUAL) To find out information, such as which of your tablespaces are being locally managed and which of them have Automatic Segment Space Management (ASSM) enabled, you can use the query in Listing 23-19. Note that the last column, RETENTION, only applies to undo tablespaces, and reveals if the undo tablespace has the guaranteed undo retention feature enabled. See 6 for more details about the guaranteed undo retention feature.

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