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When you create a new database or upgrade one to the Oracle Database 11g release, Oracle automatically creates a database job called GATHER_STATS_JOB, and Oracle Scheduler automatically schedules the job to run during the maintenance window. Here s how you verify that the automatic statisticscollection job is running: SQL> SELECT job_name FROM dba_scheduler_jobs WHERE job_name LIKE 'GATHER_STATS%'; JOB_NAME ---------------GATHER_STATS_JOB SQL> Oracle schedules the GATHER_STATS_JOB job for automatic execution using the Oracle Scheduler tool. As of Oracle Database 10g, the Scheduler replaces and enhances the old job-scheduling capability that used the DBMS_JOB package (I explain the Scheduler in detail in 18).

I provide more details about automatic optimizer statistics collection, including checking the results of the GATHER_STATS_JOB job, in 19.

Figure 5-9. EJBs running inside an EJB container EJB containers insulate EJBs from platform-specific services. It is the container s responsibility to manage things like threading, object pooling, transactions, and persistence. Containers control the life cycle of EJBs and shield them from direct access by clients. Clients can only access EJBs indirectly through a container. There are three kinds of EJBs: session beans, entity beans, and message-driven beans. A session bean exposes methods that clients can invoke (through the container). A session is a period of time over which a client uses the session bean. Session beans come in two variations: stateful and stateless. Stateful beans have a one-to-one relationship with clients and cannot be shared across clients. Each client accesses a different instance of the session bean, which maintains its own internal state between client invocations. A stateful session bean is created when a client first requests its services, and is destroyed when the session terminates. Stateless beans don t contain any state information and are therefore shareable across clients. An entity bean is a persistent object and is mapped to a persistent store, such as a database table. Each instance of an entity bean is mapped to a different row in the table. Entity beans are essentially OO facades to the persistent store and have features borrowed from the database world, such as primary keys and one-to-many relationships. There is even a query language to select and

The Oracle Scheduler has two default operation windows: The weeknight window covers the time between 10:00 pm and 6:00 am, Monday through Friday The weekend window covers the time between 12:00 am Saturday and 12:00 am Monday Together, the weeknight and the weekend windows are known as the maintenance window Oracle automatically schedules the GATHER_STATS_JOB job to run when the maintenance window opens You can disable the automatic collection of statistics in this way: SQL> BEGIN 2 dbms_schedulerdisable('gather_stats_job'); 3 END; 4 / PL/SQL procedure successfully completed SQL> The GATHER_STATS_JOB job calls the DBMS_STATSGATHER_DATABASE_STATS_JOB_PROC procedure to gather the optimizer statistics The job collects statistics only for objects that fall into one of the following classes: Objects with missing statistics: Any object without statistics is a candidate for statistics collection.

Objects with stale statistics: Oracle considers an object s statistics stale if 10 percent or more of the object s rows have been modified since the last time statistics were collected for that object By default, Oracle monitors the modifications (DML changes) in database objects, so long as you set the STATISTICS_LEVEL initialization parameter to TYPICAL or ALL (TYPICAL is the default value) The GATHER_DATABASE_STATS_JOB_PROC procedure sets priorities among the database objects based on the extent of DML activity in each object The procedure will analyze the objects that have had the most DML changes first, so that even if it doesn t finish the entire statistics-collection job before the maintenance window closes, it ensures that it collects the most-needed statistics Note that, by default, the Scheduler will terminate the GATHER_STATS_JOB job if it s still running when the maintenance window closes.

The objects for which statistics couldn t be collected before the close of the maintenance window will be processed automatically the next time the job runs You can, however, use the setting FALSE for the STOP_ON_WINDOW_CLOSE attribute of the GATHER_STATS_JOB job 18, which discusses the Oracle Scheduler, explains how to do this..

3. Ted Faison, Interactive Component-Based Software Development with Espresso (proceedings of the International Conference on Automated Software Engineering, Lake Tahoe, NV, November 1997).