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Example 6 A cook is cooking items in three pots on the stove. To determine which items are done, the cook checks the contents of each pot. The cook is essentially polling the three pots to monitor their status. The poll operation is represented by the cook s glance at each pot. The polling result is the image of each pot s contents, indicating whether the contents are ready or not. This polling operation is very quick and doesn t appreciably affect the overall system s performance in other words, the cooking time. Example 7 A software system displays weather conditions, showing temperature, humidity, and pressure. The system uses a thermometer, a hygrometer, and a barometer. Once a minute, the system polls the three devices, updating the display. After obtaining the latest values, the system is free to do other things. Polling works well in this situation because the weather variables are needed only occasionally, and the time required to obtain each measurement is very small.

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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).

65,536 65,536 65,536 65,536

Context A process P1 wishes to send a message to a process P2. The message may be a command or a request for information. While the message is being processed, P1 does not need to obtain progress feedback from P2. Forces When the execution time of a command is expected to be short, there may be little justification for progress feedback. Even if the execution time is long, it may not be feasible for P2 to report partial completion feedback results, because it might be too complicated to do, unwarranted, impractical, or even impossible.

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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.

The DBA_DATA_FILES data dictionary view is yet another extremely useful view that you ll refer to often while managing the space in your database. You can query the view to find out the names of all the data files, the tablespaces they belong to, and data file information such as the number of bytes and blocks and the relative file number. A simple query on the DBA_DATA_FILES view shows all your data files, as shown in Listing 23-17. Listing 23-17. Querying the DBA_DATA_FILES View SQL> SELECT file_name, tablespace_name FROM DBA_DATA_FILES; FILE_NAME TABLESPACE_NAME -----------------------------------------------------C:\ORACLENT\ORADATA\MANAGER\SYSTEM01.DBF SYSTEM C:\ORACLENT\ORADATA\MANAGER\UNDOTBS01.DBF UNDOTBS C:\ORACLENT\ORADATA\MANAGER\CWMLITE01.DBF CWMLITE C:\ORACLENT\ORADATA\MANAGER\DRSYS01.DBF DRSYS C:\ORACLENT\ORADATA\MANAGER\EXAMPLE01.DBF EXAMPLE C:\ORACLENT\ORADATA\MANAGER\INDX01.DBF INDX C:\ORACLENT\ORADATA\MANAGER\TOOLS01.DBF TOOLS C:\ORACLENT\ORADATA\MANAGER\USERS01.DBF USERS 8 rows selected. SQL> The DBA_DATA_FILES view is especially useful when you join it with another data dictionary view, as the example in Listing 23-18 illustrates. The query produces a report showing you the tablespace sizes, free and used space, and the percentage of used space in each tablespace. At the end, you also get the sum of total space allocated to all the tablespaces, and the breakdown of free and used space in the database. Listing 23-18. Querying the DBA_TABLESPACES View BREAK ON REPORT COMPUTE SUM OF tbsp_size ON REPORT compute SUM OF used ON REPORT compute SUM OF free ON REPORT COL COL COL COL COL tbspname tbsp_size used free pct_used FORMAT FORMAT FORMAT FORMAT FORMAT a20 999,999 999,999 999,999 999 HEADING 'Tablespace Name' HEADING 'Size|(MB)' HEADING 'Used|(MB)' HEADING 'Free|(MB)' HEADING'% Used' tbspname tbsp_size, used,

SQL> SELECT df.tablespace_name 2 sum(df.bytes)/1024/1024 3 nvl(sum(e.used_bytes)/1024/1024,0)

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