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Before we continue to examine the rest of the processes, let s discuss why there are two connection modes and when one might be more appropriate than the other.

warning and critical values for the only alert in my database, which happens to be the default tablespace space-usage metric: SQL> SELECT metrics_name, warning_value, critical_value 2 FROM dba_thresholds; METRICS_NAME WARNING_VALUE CRITICAL_VALUE ---------------------------------------------------------Tablespace Space Usage 85 97 SQL>

Example 11 A satellite system, during the course of initialization, needs to start up three subsystems

As you ll see later in this chapter, the V$ACTIVE_SESSION_HISTORY view shows you the snapshots of all the active sessions in your database. The snapshots are taken every second, so the data in this view keeps changing. The DBA_HIST_ACTIVE_SESS_HISTORY view holds the contents of the V$ACTIVE_SESSION_HISTORY view in permanent storage. The view contains snapshots of the V$ACTIVE_SESSION_HISTORY view.

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As noted previously, in dedicated server mode there is a one-to-one mapping between client connection and server process. This is by far the most common method of connection to the Oracle database for all SQL-based applications. It is the simplest to set up and provides the easiest way to establish connections. It requires little to no configuration. Since there is a one-to-one mapping, you do not have to be concerned that a long-running transaction will block other transactions. Those other transactions will simply proceed via their own dedicated processes. Therefore, it is the only mode you should consider using in a non-OLTP environment where you may have long-running transactions. Dedicated server is the recommended configuration for Oracle, and it scales rather nicely. As long as your server has sufficient hardware (CPU and RAM) to service the number of dedicated server processes your system needs, dedicated server may be used for thousands of concurrent connections. Certain operations must be done in a dedicated server mode, such as database startup and shutdown, so every database will have either both or just a dedicated server setup.

You can manage the new advisory framework in Oracle Database 10g using new data dictionary views, such as the ones in the following sections.

to become operational. Each subsystem requires a variable amount of time to start up, and the satellite system can t begin operation until all subsystems have been started up. The Startup Controller (StartCon) issues asynchronous Start commands to all the subsystems, and resumes other tasks until the subsystems report they are all up. Figure 9-8 shows the system. As each system starts, it fires an event notification to the Startup Controller. Completion feedback is therefore pushed from the callees to the caller. The order of arrival of completion feedback is not predictable by StartCon, which must wait until all systems report done before continuing.

Shared server setup and configuration, while not difficult, involves an extra step beyond dedicated server setup The main difference between the two is not, however, in their setup; it is in their mode of operation With dedicated server, there is a one-to-one mapping between client connections and server processes With shared server, there is a many-to-one relationship: many clients to a shared server As its name implies, shared server is a shared resource, whereas a dedicated server is not When using a shared resource, you must be careful to not monopolize it for long periods of time As you saw previously, use of a simple DBMS_LOCKSLEEP(20) in one session would monopolize a shared server process for 20 seconds Monopolization of these shared server resources can lead to a system that appears to hang Figure 5-2 depicts two shared servers.

You can use the DBA_ADVISOR_DEFINITIONS view to find out the properties of all advisors in your database, as shown here: SQL> SELECT advisor_id, advisor_name FROM DBA_ADVISOR_DEFINITIONS; ADVISOR_ID ADVISOR_NAME ---------- --------------------------1 ADDM 2 SQL Access Advisor 3 Undo Advisor 4 SQL Tuning Advisor 5 Segment Advisor 6 SQL Workload Manager 7 Tune MView 7 rows selected. SQL>

The DBA_ADVISOR_USAGE view provides usage information for all the advisors. Here s an example that shows that the ADDM was the advisor that was used the most: SQL> SELECT * FROM DBA_ADVISOR_USAGE; ADVISOR_ID LAST_EXEC_ NUM_EXECS ---------- ---------- ---------1 04/25/2005 43 2 02/03/2005 1 3 11/25/2004 2 4 03/26/2005 17

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