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The Java pool was added in version 8.1.5 of Oracle to support running Java in the database. If you code a stored procedure in Java, Oracle will make use of this chunk of memory when processing that code. The parameter JAVA_POOL_SIZE is used to fix the amount of memory allocated to the Java pool for all session-specific Java code and data. The Java pool is used in different ways, depending on the mode in which the Oracle server is running. In dedicated server mode, the Java pool includes the shared part of each Java class, which is actually used per session. These are basically the read-only parts (execution vectors, methods, etc.) and are about 4KB to 8KB per class. Thus, in dedicated server mode (which will most likely be the case for applications using purely Java stored procedures), the total memory required for the Java pool is quite modest and can be determined based on the number of Java classes you will be using. It should be noted that none of the per-session state is stored in the SGA in dedicated server mode, as this information is stored in the UGA and, as you will recall, the UGA is included in the PGA in dedicated server mode.

If you have created any jobs within your database using the DBMS_JOB package ( 24 shows you how to do this), you can query the DBA_JOBS view to monitor the job status. Listing 23-3 shows a typical query against the DBA_JOBS view. Listing 23-3. Querying the DBA_JOBS View SQL> 2 3 4 5 6 /* Job Identifier */ /* last time the job was successfully run */ /* data when the job started executing */ /* next time the job is scheduled to run * /Y=an attempt will not be made to run it. No=attempt will be made*/ 7 interval, /* the next NEXT_DATE */ 8 failures, /* Number of failures since last success */ 9 what /*Text of the PL/SQL code the job will execute*/ 10 FROM DBA_JOBS; SELECT job, last_date, this_date, next_date, broken,

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The DBA_SCHEDULER_JOBS view displays general information about all Scheduler jobs in the database. The view provides information on jobs, and the PROGRAM_NAME and SCHEDULE_NAME the job belongs to. Here s a typical query using the view: SQL> SELECT job_name, schedule_name, program_name 2* FROM DBA_SCHEDULER_JOBS; JOB_NAME SCHEDULE_NAME PROGRAM_NAME -----------------------------------------------------------------PURGE_LOG DAILY_PURGE_SCHEDULE PURGE_LOG_PROG GATHER_STATS_JOB MAINTENANCE_WINDOW_GROUP GATHER_STATS_PROG SQL> The DBA_SCHEDULER_PROGRAMS view shows information on all the Scheduler programs. Similarly, the DBA_SCHEDULER_SCHEDULES and the DBA_SCHEDULER_WINDOWS views display information about all the Scheduler schedules and windows, respectively.

When connecting to Oracle using a shared server connection, the Java pool includes both of the following: The shared part of each Java class. Some of the UGA used for per-session state of each session, which is allocated from the JAVA_POOL within the SGA. The remainder of the UGA will be located as normal in the Shared pool, or if the Large pool is configured, it will be allocated there instead. As the total size of the Java pool is fixed in Oracle9i and before, application developers will need to estimate the total requirement of their applications and multiply this estimate by the number of concurrent sessions they need to support. This number will dictate the overall size of the Java pool. Each Java UGA will grow or shrink as needed, but bear in mind that the pool must be sized such that all UGAs combined must be able to fit in it at the same time. In Oracle 10g and above, this parameter may be modified, and the Java pool may grow and shrink over time without the database being restarted.

One of the simplest ways of classifying an interaction is based on which way information flows in relationship to the party starting the interaction. If one party gives information to another party, the information is said to be pushed. If one party requests information from another party, the information is said to be pulled. In push-pull models, don t worry about lower-level interaction details, such as whether exchanges are synchronous or asynchronous. What matters the most is the overall direction of information flow relative to the party starting the conversation. Let s look at push and pull interactions more in detail.

The DBA_SCHEDULER_RUNNING_JOBS view gives you details about all running Scheduler jobs in the database. You can use this view to manage currently running jobs.

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