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Notice how the first time I queried, I was using S000 as the shared server Then in another session, I executed a long-running statement that monopolized the shared server, which just happened to be S000 this time The first nonbusy shared server is the one that gets assigned the work to do, and in this case no one else was asking to use the S000 shared server, so the DBMS_LOCK command took it Now, when I queried again in the first SQL*Plus session, I got assigned to another shared server process, since the S000 shared server was busy It is interesting to note that the parse of a query (returns no rows yet) could be processed by shared server S000, the fetch of the first row by S001, the fetch of the second row by S002, and the closing of the cursor by S003.

As you can recall, a threshold alert (also known as a stateful alert) alerts you when warning and critical thresholds on certain database metrics are met. For example, physical reads per second is a candidate for a threshold alert. The DBA_OUTSTANDING_ALERTS view shows all outstanding alerts in your database. Here s a typical query using this view: SQL> SELECT object_name, reason, advisor_name, suggested_action FROM DBA_OUTSTANDING_ALERTS;

The DBA_ALERT_HISTORY view shows the history of all alerts that the database has already resolved. Remember that all stateful or threshold alerts appear in the DBA_OUTSTANDING_ ALERTS view first. It s only after they re resolved by clearing the problem condition that the alerts are recorded in the DBA_ALERT_HISTORY view.

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Figure 9-7. An asynchronous blind interaction, with feedback pushed to caller When the callee finishes executing the command, it invokes a caller method, providing the appropriate completion feedback information. In the context of blind interactions, feedback only returns completion information. Progress updates, which report how far along a command is, are a form of feedback classified under transparent interactions, described a bit later in the chapter.

That is, an individual statement might be processed bit by bit by many shared servers So, what we have seen in this section is that a connection a physical pathway from a client to a database instance may have zero, one, or more sessions established on it We have seen one use case of that when using SQL*Plus s AUTOTRACE facility Many other tools employ this ability as well For example, Oracle Forms uses multiple sessions on a single connection to implement its debugging facilities The n-tier proxy authentication feature of Oracle, used to provide end-to-end identification of users from the browser to the database, makes heavy use of the concept of a single connection with multiple sessions, but in each session there would use a potentially different user account We have seen that sessions can use many processes over time, especially in a shared server environment.

When you use any of the management advisors, such as the SQL Tuning Advisor, Oracle gives you the option of providing the queries in the form of a SQL Tuning Set. The DBA_SQLSET view provides information about all such SQL Tuning Sets that exist in the database.

The DBA_SQLSET_PLANS view describes all SQL plans captured in the SQL Tuning Sets in a database. The DBA_SQLTUNE_STATISTICS view shows statistics about all SQL statements in a database. The DBA_SQLSET_STATEMENTS view shows the SQL statements that are part of a SQL Tuning Set.

Also, if we are using connection pooling with Oracle Net, then our session might not be associated with any process at all; the client would drop the connection after an idle time and reestablish it transparently upon detecting activity In short, there is a many-to-many relationship between connections and sessions However, the most common case, the one most of us see day to day, is a one-to-one relationship between a dedicated server and a single session..

her to fill out an employment history form. While the applicant works, the clerk resumes with her own work. When the applicant finishes, she walks over to the clerk s desk and hands her the completed form. In this example, the clerk is the caller, the applicant the callee. While the callee is busy filling out the form, the caller works on something else, so the caller and callee operate asynchronously with respect to each other. When the callee is finished, she uses a push interaction to return completion feedback (the completed employment form) to the caller.

The DBA_SQLTUNE_PLANS view shows details about the execution plans generated for all SQL statements in the database during a SQL tuning session. The DBA_SQLTUNE_STATISTICS view provides the execution statistics for all SQL statements in the database. For example, you can view the elapsed time, buffer gets, disk reads, and the CPU time for various SQL statements.

The DBA_THRESHOLDS view shows you threshold details, such as the warning and critical values for all metrics for which the database has set thresholds. Here s a sample query that shows the

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