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SELECT a.user_id,d.username,s.sql_text, SUM(a.wait_time + a.time_waited) total_wait_time FROM v$active_session_history a, v$sqlarea s, dba_users d WHERE a.sample_time between sysdate - 30/2880 and sysdate AND a.sql_id = s.sql_id AND a.user_id = d.user_id GROUP BY a.user_id,s.sql_text, d.username; SQL_TEXT -----------------------------BEGIN dbms_stats...; END; TOTAL_WAIT_TIME ---------------9024233

Listing 8-21. Using Object Pascal Semaphores to Fire Events unit Publisher; interface uses Windows, SysUtils, Classes; type TSender = class private NotificationSemaphore: THandle; public constructor Create; destructor Destroy; procedure FireEvent; end; implementation constructor TSender.Create; var InitialCount: LongInt; MaximumCount: LongInt; begin InitialCount := 0; MaximumCount := 1000; NotificationSemaphore := CreateSemaphore(nil, InitialCount, MaximumCount, 'MyNotificationSemaphore'); end; destructor TSender.Destroy; begin CloseHandle(NotificationSemaphore); end; procedure TSender.FireEvent; begin ReleaseSemaphore(NotificationSemaphore, 1, nil); end; end. Listing 8-22. Using Object Pascal Semaphores to Receive Notifications unit Subscriber; interface uses Windows, SysUtils, Classes;

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The V$SESSION_WAIT view shows the events and resources that active sessions are waiting for. Using the V$SESSION_WAIT view, you can also see what types of wait classes your session waits belong to. Here s an example: SQL> SELECT wait_class, event, sid, state, wait_time, seconds_in_wait FROM v$session_wait ORDER BY wait_class, event, sid; WAIT_CLASS EVENT SID ---------- -------------------- ---------Application enq: TX 269 row lock contention Idle Queue Monitor Wait 270 Idle SQL*Net message from client 265 Idle jobq slave wait 259 Idle pmon timer 280 Idle rdbms ipc message 267 Idle wakeup time manager 268 Network SQL*Net message to client 272 SQL> STATE WAIT_TIM SEC_IN_WAIT ----------------------- -WAITING 0 73 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITING 0 WAITED SHORT TIME 40 73 8485 73 184770 40 1

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The previous query indicates that the most important wait lies within the Application wait class. The V$SYSTEM_WAIT_CLASS view gives you a breakdown of waits by wait classes, as shown here: SQL> SELECT wait_class, time_waited FROM v$system_wait_class ORDER BY time_waited DESC; WAIT_CLASS TIME_WAITED ----------------------------------------------Idle 1.0770E+11 User I/O 4728148400 Other 548221433 Concurrency 167154949 Network 56271499 Application 46336445 Commit 35742104

type TReceiver = class private NotificationSemaphore: THandle; public constructor Create; procedure Run; procedure HandleEvent; end; implementation constructor TReceiver.Create; var InitialCount: LongInt; MaximumCount: LongInt; begin InitialCount := 0; MaximumCount := 1000; NotificationSemaphore := CreateSemaphore(nil, InitialCount, MaximumCount, 'MyNotificationSemaphore'); end; procedure TReceiver.Run; begin while True do begin WaitForSingleObject(NotificationSemaphore, INFINITE); HandleEvent; end; end; procedure TReceiver.HandleEvent; begin // process the notification end; end. The sender calls the Windows API method ReleaseSemaphore to signal the semaphore. The method name is rather unfortunate, as it seems to imply that it releases the resources used by a semaphore. On the contrary, it increments the internal counter associated with the given semaphore, releasing the next waiting thread waiting on the semaphore. Threads wait for a semaphore to become signaled by calling the Windows API method WaitForSingleObject. The call tests the semaphore and blocks if no notifications are pending.

A database may use one or more methods to implement concurrency of use. These include locking mechanisms to guarantee exclusive use of a table by a transaction, time-stamping methods that enable serialization of transactions, and the validation-based scheduling of transactions. Locking methods are called pessimistic because they assume that transactions will violate the serializable schedules unless they re prevented explicitly from doing so. The time-stamping and validation methods, on the other hand, are called optimistic because they don t assume that transactions are bound to violate the serializable schedules. As you might guess, locking methods cause more delays than the optimistic methods because they keep conflicting transactions waiting for access to the locked database objects. On the positive side, however, locking methods don t have to abort transactions because they prevent potentially conflicting transactions from interacting with other transactions. The optimistic methods usually have to abort transactions when they might violate a serializable schedule. Time-stamping methods assign time stamps to each transaction and enforce serializability by ensuring that the transaction time stamps match the schedule for the transactions. Validation methods maintain a record of transaction activity. Before committing a transaction, the changed data is validated against the changed items of all currently active transactions to eliminate any unserialized schedules.

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