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The V$LATCH view shows latch statistics since the beginning of the instance. The statistics are grouped by latch name. This view is usually joined with the V$LATCHNAME view to give you the statistics associated with each latch request that occurs in the current instance.

The V$LATCHNAME and V$LATCH views have an intimate relationship. The V$LATCHNAME view gives you the name of each type of latch requested since the instance began, and the V$LATCH view provides the statistics for each of those latches. Every row in the V$LATCHNAME view corresponds to a row in the V$LATCH view, and usually you join these two views to get information on the latches being held in the instance.

Summary

The V$PROCESS view shows all the active processes in the instance. The LATCHWAIT column indicates the latches the process is waiting for. If there are latch waits, the LATCHWAIT column will be NULL. The following is a simple example using the view: SQL> SELECT username, serial#, latchwait, 2* program FROM V$PROCESS;

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In order for an interaction to be interruptible, the caller must be asynchronous, because the caller must have the ability to send the abort command during the execution of a previously issued command. The callee is not required to be asynchronous, but must have the ability to execute the abort command using thread-safe operations, since the original command and the abort command will arrive on different threads. Both blind and transparent interactions can be made interruptible. The hallmark of an interruptible interaction is the presence of a dedicated channel to carry abort commands from the caller to the callee. While the concept of interruptible interactions is simple, aborting a command may require extensive processing to clean up intermediate results or other side effects of the partially completed command. This cleanup work is not considered part of the interruptible interaction pattern itself.

USERNAME SERIAL# LATCHWAIT PROGRAM --------------- ---------- -------- ----------0 PSEUDO SYSTEM 1 ORACLE.EXE SYSTEM 1 ORACLE.EXE SYSTEM 1 ORACLE.EXE SYSTEM 1 ORACLE.EXE SYSTEM 1 ORACLE.EXE SYSTEM 1 ORACLE.EXE SYSTEM 1 ORACLE.EXE SYSTEM 5 ORACLE.EXE SQL>

This chapter covered a lot of material that, at times, may have made you scratch your head. While locking is rather straightforward, some of its side effects are not. However, it is vital that you understand these issues. For example, if you were not aware of the table lock Oracle uses to enforce a foreign key relationship when the foreign key is not indexed, then your application would suffer from poor performance. If you did not understand how to review the data dictionary to see who was locking whom, you might never figure that one out. You would just assume that the database hangs sometimes. I sometimes wish I had a dollar for every time I was able to solve the insolvable hanging issue by simply running the query to detect unindexed foreign keys and suggesting that we index the one causing the problem I would be very rich.

V$PROCESS_MEMORY is a new view that shows how PGA memory is being used by each process, by showing the distribution of PGA memory in categories such as SQL, PL/SQL, OLAP, and JAVA. 22 shows an example of using this view.

A process P1 sends a command to a process P2. P1 gets no progress reports while P2 executes the command. Before P2 completes the command, P1 may decide to abort the operation.

You can use the V$UNDOSTAT view to monitor the AUM feature. The view shows undo space consumption, transaction concurrency, and length of queries executed in your instance.

This process is responsible for cleaning up after abnormally terminated connections For example, if your dedicated server fails or is killed for some reason, PMON is the process responsible for fixing (recovering or undoing work) and releasing your resources PMON will initiate the rollback of uncommitted work, release locks, and free SGA resources allocated to the failed process In addition to cleaning up after aborted connections, PMON is responsible for monitoring the other Oracle background processes and restarting them if necessary (and if possible) If a shared server or a dispatcher fails (crashes), PMON will step in and restart another one (after cleaning up for the failed process) PMON will watch all of the Oracle processes and either restart them or terminate the instance as appropriate For example, it is appropriate to fail the instance in the event the database log writer process, LGWR, fails.

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