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Queue notificationQueue = new Queue(); public void AddNotification(string thePayoad) { lock(this) { notificationQueue.Enqueue(thePayoad); } } public string RemoveNotification() { lock(this) { return notificationQueue.Dequeue() as string; } } } public class Sender { Rendezvous sharedMemory; public Sender(Rendezvous theSharedMemory) { sharedMemory = theSharedMemory; } int notificationCount = 0; public void FireEvent() { string payload = string.Format("Notification {0}", notificationCount); notificationCount += 1; sharedMemory.AddNotification(payload); } } public class Receiver { Rendezvous sharedMemory; public bool terminationRequested; public Receiver(Rendezvous theSharedMemory) { sharedMemory = theSharedMemory; } public void Run() { while (!terminationRequested) { WaitForNotifications(); System.Threading.Thread.Sleep(10); }

Oracle scans the entire table during a full table scan. Oracle reads each block in the table sequentially, so the full table scan can be efficient if the database uses a high default value internally for the DB_FILE_MULTIBLOCK_READ_COUNT initialization parameter. The parameter determines the maximum number of blocks the database reads during a sequential scan. However, for large tables, full table scans are inefficient in general.

Accessing a table by ROWID retrieves rows using unique ROWIDs. ROWIDs in Oracle specify the exact location in the datafile and the data block where the row resides, so ROWID access is the fastest way to retrieve a row in Oracle. Often, Oracle obtains the ROWID through an index scan of the table s indexes. Using these ROWIDs, Oracle swiftly fetches the rows.

} void WaitForNotifications() { if (!sharedMemory.IsNotificationPending) return; // notification found: get the payload string s = sharedMemory.RemoveNotification(); ProcessNotification(s); } void ProcessNotification(string s) { } } Listing 8-15. VB .NET Example with a Queued Rendezvous Object Public Class Rendezvous Public ReadOnly Property IsNotificationPending() As Boolean Get Return notificationQueue.Count > 0 End Get End Property Dim notificationQueue As New Queue Public Sub AddNotification(ByVal thePayoad As String) SyncLock (Me) notificationQueue.Enqueue(thePayoad) End SyncLock End Sub Public Function RemoveNotification() As String SyncLock (Me) Return CStr(notificationQueue.Dequeue()) End SyncLock End Function End Class Public Class Sender Dim sharedMemory As Rendezvous Public Sub New(ByVal theSharedMemory As Rendezvous) sharedMemory = theSharedMemory; End Sub Dim notificationCount As Integer = 0 Public Sub FireEvent() Dim payload As String = String.Format("Notification {0}", notificationCount) notificationCount += 1 sharedMemory.AddNotification(payload) End Sub End Class

An index stores two things: the column value of the column on which the index is based and the ROWID of the rows in the table that contain that column value. An index scan retrieves data from an index using the values of the index columns. If the query requests only the indexed column values, Oracle will return those values. If the query requests other columns outside the indexed column, Oracle will use the ROWIDs to get the rows of the table.

When you need to access data that s in two or more tables, Oracle joins the tables based on a common column. However, there are several ways to join the row sets returned from the execution plan steps. For each statement, Oracle evaluates the best join method based on the statistics and the type of unique or primary keys on the tables. After Oracle has evaluated the join methods, the CBO picks the join method with the least cost. The following are the common join methods used by the CBO: Nested loop join: A nested loop join involves the designation of one table as the driving table (also called the outer table) in the join loop. The other table in the join is called the inner table. Oracle fetches all the rows of the inner table for every row in the driving table. Hash join: When you join two tables, Oracle uses the smaller table to build a hash table on the join key. Oracle then searches the larger table and returns the joined rows from the hash table. Sort-merge join: The sort join operation sorts the inputs on the join key, and the merge join operation merges the sorted lists. If the input is already sorted by the join column, there s no need for a sort join operation for that row source.