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Selecting data from V$ dynamic performance views and interpreting them meaningfully isn t always so easy to do. Because the views are dynamic, the information that they contain is constantly changing as Oracle updates the underlying tables for each wait event. Also, the wait-related dynamic performance views you just examined don t provide crucial data such as bind variable information. For a more detailed level of wait information, you can use one of the methods described in the following sections.

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You can get all kinds of bind variable information by using a special trace called the 10046 Trace, which is much more advanced than the SQL Trace you saw in 21. The use of this trace causes an output file to be written to the trace directory. You can set the 10046 Trace in many ways by specifying various levels, and each higher level provides you with more detailed information. (Level 12 is used in the following case as an example only it may give you much more information than necessary. Level 4 gives you detailed bind value information, and Level 8 gives you wait information.)

You can use the ALTER SESSION statement as follows: SQL> ALTER SESSION SET EVENTS '10046 trace name context forever level 12'; Session altered. SQL> You can also incorporate the following line in your init.ora file: event = 10046 trace name context forever, level 12

Figure 6-1. Classes and vtables Every instance of a class that has at least one virtual function contains a pointer to a vtable (vptr). When a virtual function is called via a pointer or a reference, this vtable pointer is used to determine the address of the most derived function at runtime. This implementation ensures that overrides provided by a derived class are called. However, virtual functions called on partially constructed objects are not always resolved to the most derived override. To understand this, it is necessary to discuss the construction order of native classes. Every constructor first calls its base class constructor until the root of the object hierarchy is reached. Instead of initializing the vtable pointer once to refer to the vtable of the most derived class, each base class constructor in the object hierarchy initializes the vtable pointer

You can use the oradebug utility as shown in the following example: SQL> ORADEBUG SETMYPID Statement processed. SQL> ORADEBUG EVENT 10046 TRACE NAME CONTEXT FOREVER LEVEL 8; Statement processed. SQL> In this example, SETMYPID indicates that you want to trace the current session. If you want a different session to be traced, you replace this with SETOSPID <Process Id>.

Use the SET_EV procedure of the DBMS_SYSTEM package so you can set tracing on in any session, as shown in the following example: SQL> EXECUTE SYS.DBMS_SYSTEM.SET_EV (9,271,10046,12,''); PL/SQL procedure successfully completed. SQL>

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The DBMS_MONITOR package provides you with an easy way to collect extended session trace information. You enable tracing of a user s session using the DBMS_MONITOR.SESSION_ TRACE_ENABLE package. Here s the structure of the procedure: DBMS_MONITOR.SESSION_TRACE_ENABLE( session_id IN BINARY_INTEGER DEFAULT NULL, serial_num IN BINARY_INTEGER DEFAULT NULL, waits IN BOOLEAN DEFAULT TRUE, binds IN BOOLEAN DEFAULT FALSE) If you set the waits parameter to TRUE, the trace will contain wait information. Similarly, setting the binds parameter to TRUE will provide bind information for the session being traced. If you don t set the SESSION_ID parameter or set it to NULL, your own session will be traced. Here s how you trace your session using the DBMS_MONITOR package: SQL> EXECUTE dbms_monitor.session_trace_enable (waits=>TRUE, binds=>TRUE); In addition to all the preceding methods of gathering wait information, you have the handy OEM Database Control tool, which lets you drill down to various items from the Database Control home page.

Both the AWR report that you can obtain by using the awrrpt.sql script and the ADDM report that you can obtain with the addmrpt.sql script contain copious amounts of wait information.