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The interesting observation for me is that 10 users using bind variables (and very few latch requests as a result) use the same amount of hardware resources as 2 to 2.5 users that do not use bind variables (i.e., that overuse a latch, or process more than they need to). When you examine the results for 10 users, you see that nonuse of bind variables results in the use of 6 times the CPU and takes 3.4 times the execution time when compared to the bind variable solution. The more users are added over time, the longer each user spends waiting for these latches. We went from an average of 4 seconds/session of wait time for latches with 5 users to an average of 45 seconds/session of wait time with 10 users. However, the implementation that avoided overuse of the latch suffered no ill effects as it scaled up.

The V$SESSION dynamic performance view is one of the most important monitoring- and performance-related views. The view shows an enormous amount of detail about the user session, including the following items:

document to go to another document. Inside the browser, the HTML rendering component (HtmlCom) issues a GetDocument command to the HTTP communication component (HttpCom), as shown in Figure 9-14. While HttpCom loads the requested page, HtmlCom issues a series of GetProgress queries to HttpCom. HtmlCom uses the information to display a progress bar on the user s screen to give an indication of how long the load process will take.

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Session ID and serial number Username Command in progress The status of the session, whether active, killed, and so on Operating system user ID and machine name SQL ID and SQL hash value for the SQL statement that s being executed Blocking session information Wait information The following script gives you the SID and serial number of a user, in case you want to kill the session for some reason: SQL> SELECT sid, serial#, 2 username FROM v$session 3 WHERE username ='&username'; Enter value for username: HR old 3: where username ='&username' new 3: where username ='HR' SID SERIAL# USERNAME ---------- ---------- ---------22 19167 HR SQL>

So far we have looked mostly at locks that Oracle places for us transparently. When we update a table, Oracle places a TM lock on it to prevent other sessions from dropping that table (or performing most DDL, in fact). We have TX locks that are left on the various blocks we modify so others can tell what data we own. The database employs DDL locks to protect objects from change while we ourselves are changing them. It uses latches and locks internally to protect its own structure. Next, let s take a look at how we can get involved in some of this locking action. Our options are as follows: Manually lock data via a SQL statement. Create our own locks via the DBMS_LOCK package. In the following sections, we will briefly discuss why you might want to do each of these.

The V$LOCK view indicates the session holding the lock and the type of lock that s being held or requested. The two key columns in this view are the LMODE column, which tells you the mode in which a session holds the lock, and the REQUEST column, which specifies the mode in which a different session requests the lock. For both the LMODE and the REQUEST columns, you should translate the numerical lock mode according the following list, which orders the locks from least to most restrictive: Lock mode 0: None Lock mode 1: Null (NULL) Lock mode 2: Row lock shared (SS) Lock mode 3: Row lock exclusive (SX) Lock mode 4: Shared lock (S) Lock mode 5: Shared lock row exclusive (SSX) Lock mode 6: Exclusive (X) Here s the output of a query using the V$LOCK view: SQL> SELECT sid, type,lmode, request FROM V$LOCK; SID TY LMODE REQUEST ------ -- ---------- -------2 MR 4 0 2 MR 4 0 2 MR 4 0 2 MR 4 0

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Context A process P1 wishes to send a command to a process P2. While the command is being executed, certain conditions can arise that require P1 to cancel the command before it is completed. Forces Many systems require the ability to adapt to unusual or unreliable situations. If P1 detects certain conditions during the execution of a previously issued command, it may need to cancel the command and resort to an alternative course of action.

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