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EVENT TIME_WAITED AVERAGE_WAIT -----------------------------------------------------------------rdbms ipc message 24483121 216.71465 SQL*Net message from client 18622096 106.19049 PX Idle Wait 12485418 205.01844 pmon timer 3120909 306.93440 smon timer 3093214 29459.18100 PL/SQL lock timer 3024203 1536.68852 db file sequential read 831831 .25480 db file scattered read 107253 .90554 free buffer waits 52955 43.08787 log file parallel write 19958 2.02639 latch free 5884 1.47505 ... 58 rows selected. SQL> This example shows a simple system with hardly any waits other than the idle type of events and the SQL*Net wait events. There aren t any significant I/O-related or latch-contention related wait events in this database. The db file sequential read (caused by index reads) and the db file scattered read (caused by full table scans) wait events do seem somewhat substantial, but if you compare the total wait time contributed by these two events to the total wait time since the instance started, they don t stand out. Furthermore, the AVERAGE_WAIT column shows that both these waits have a low average wait time (caused by index reads). I discuss both these events, along with several other Oracle wait events, later in this chapter, in the section Important Oracle Wait Events. However, if your query on a real-life production system shows significant numbers for any nonidle wait event, it s probably a good idea to find out the SQL statements that are causing the waits. That s where you have to focus your efforts to reduce the waits. You have different ways to obtain the associated SQL for the waits, as explained in the following section.

support bidirectional traffic, so a receiver can send information back to the sender over the same pipe it reads from. Listing 8-18 shows an Object Pascal implementation of the sender. Object Pascal makes direct Win32 calls to create and manipulate pipes. A C++ program would make exactly the same calls. I didn t use C# for this example, because the .NET Framework doesn t support traditional pipes. In their place, there is an entire infrastructure called the Remoting Framework that provides much more functionality, and in an object-oriented way. Listing 8-18. Using Object Pascal to Fire Events Using a Pipe type TSender = class private NotificationPipe: THandle; public constructor Create; destructor Destroy; override; procedure FireEvent; end; implementation constructor TSender.Create; const PipeName = '\\.\pipe\mynamedpipe'; AccessMode = PIPE_TYPE_MESSAGE or PIPE_READMODE_MESSAGE or PIPE_WAIT; MaxPipeInstances = 2; InBufferSize = 4096; OutBufferSize = 0; ClientTimeout = NMPWAIT_USE_DEFAULT_WAIT; NoSecurityAttributes = nil; begin NotificationPipe := CreateNamedPipe(PipeName, PIPE_ACCESS_OUTBOUND, AccessMode, MaxPipeInstances, OutBufferSize, InBufferSize, ClientTimeout, NoSecurityAttributes); end; destructor TSender.Destroy; begin CloseHandle(NotificationPipe); end; procedure TSender.FireEvent; var BytesWritten: Cardinal; Payload, ErrorMessage: String; Success: Boolean; begin if NotificationPipe = INVALID_HANDLE_VALUE then Exit;

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Obtaining wait information is as easy as querying the related dynamic performance tables. For example, if you wish to find out quickly the types of waits different user sessions (session-level wait information) are facing and the SQL text of the statements they re executing, you can use the following query: SQL> 2 3 4 5 6 7* SELECT s.username, t.sql_text, s.event FROM V$SESSION s, V$SQLTEXT t WHERE s.sql_hash_value = t.hash_value AND s.sql_address = t.address AND s.type <> 'BACKGROUND' ORDER BY s.sid,t.hash_value,t.piece;

Note You might wonder why only 2MB of RAM is reported in use by the system with one active user. It

You need to turn on statistics collection by either setting the initialization parameter TIMED_STATISTICS to TRUE or setting the initialization parameter STATISTICS_LEVEL to TYPICAL or ALL.

If you want a quick instance-wide wait event status, showing which events were the biggest contributors to total wait time, you can use the query shown in Listing 22-16 (several idle events are listed in the output, but I don t show them here). Listing 22-16. Instance-Wide Waits Sorted by Total Wait Time SQL> 2 3 4 5 6* SELECT event, total_waits,time_waited FROM V$SYSTEM_EVENT WHERE event NOT IN ('pmon timer','smon timer','rdbms ipc reply','parallel deque wait ,'virtual circuit','%SQL*Net%','client message','NULL ORDER BY time_waited DESC;

Payload := 'Notification Payload'; Success := WriteFile(NotificationPipe, PChar(Payload)^, Length(Payload), BytesWritten, nil); if not Success then ErrorMessage := SysErrorMessage(GetLastError); end; end. The sender opens a write-only pipe using the Windows API method CreateNamedPipe. To fire an event, the sender writes to the pipe as if it were a file, using the Windows API method WriteFile. The Object Pascal receiver implementation is shown in Listing 8-19. Listing 8-19. Using Object Pascal to Receive Notifications over a Pipe type TReceiver = class private NotificationPipe: THandle; public constructor Create; destructor Destroy; override; procedure Run; procedure DoRun; function WaitForNotifications: String; procedure HandleEvent(ThePayload: String); end; implementation constructor TReceiver.Create; const PipeName = '\\.\pipe\mynamedpipe'; PipeAccess = GENERIC_READ; NoPipeSharing = 0; NoSecurityAttributes = nil; DefaultPipeAttributes = 0; NoTemplateFile = 0; begin NotificationPipe := CreateFile(PipeName, PipeAccess, NoPipeSharing, NoSecurityAttributes, OPEN_EXISTING, DefaultPipeAttributes, NoTemplateFile); end; destructor TReceiver.Destroy; begin CloseHandle(NotificationPipe); end; procedure TReceiver.Run; begin while NotificationPipe <> INVALID_HANDLE_VALUE do DoRun; end;

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