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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.)

mystat.sql and its companion, mystat2.sql, are used to show the increase in some Oracle statistic before and after some operation. mystat.sql simply captures the begin value of some statistic: set echo off set verify off column value new_val V define S="&1" set autotrace off select a.name, b.value from v$statname a, v$mystat b where a.statistic# = b.statistic# and lower(a.name) like '%' || lower('&S')||'%' / set echo on and mystat2.sql reports the difference for us: set echo off set verify off select a.name, b.value V, to_char(b.value-&V,'999,999,999,999') diff from v$statname a, v$mystat b

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

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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>.

where a.statistic# = b.statistic# and lower(a.name) like '%' || lower('&S')||'%' / set echo on For example, to see how much redo is generated by some UPDATE, we can do the following: big_table@ORA10G> @mystat "redo size" big_table@ORA10G> set echo off NAME VALUE ------------------------------ ---------redo size 496 big_table@ORA10G> update big_table set owner = lower(owner) 2 where rownum <= 1000; 1000 rows updated. big_table@ORA10G> @mystat2 big_table@ORA10G> set echo off NAME V DIFF ------------------------------ ---------- ---------------redo size 89592 89,096 That shows our UPDATE of 1,000 rows generated 89,096 bytes of redo.

If you use synchronous procedure calls to deliver notifications, the sender delivers the notification in succession to each subscriber, blocking during each delivery. The time it takes to deliver the notification completely to all subscribers is the sum of the processing times of all subscribers. Figure 8-23 shows the notification delivery sequence of A sending notifications to B and then to C.

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>

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.

The SHOW_SPACE routine prints detailed space utilization information for database segments. Here is the interface to it: ops$tkyte@ORA10G> desc show_space PROCEDURE show_space Argument Name Type ------------------------------ ----------------------P_SEGNAME VARCHAR2 P_OWNER VARCHAR2 P_TYPE VARCHAR2 P_PARTITION VARCHAR2 The arguments are as follows: P_SEGNAME: Name of the segment (e.g., the table or index name). P_OWNER: Defaults to the current user, but you can use this routine to look at some other schema.

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