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FireMessage("Searching..."); FireSearchRequested(); StartBackgroundSearch(); } // a reference to the search entry point. // We call this method on a background thread public ThreadStart OnSearchStart; // start the search on a background thread void StartBackgroundSearch() { if (OnSearchStart == null) return; searchThread = new Thread(OnSearchStart); searchThread.Start(); } // } VB .NET Public Class CoordinatorSearch Private _searchThread As Thread Public Sub StartSearch(ByVal theFolderPath As String) If Not _searchThread Is Nothing Then If _searchThread.IsAlive Then _searchThread.Abort() End If End If FireMessage("Searching...") FireSearchRequested() StartBackgroundSearch() End Sub ' a reference to the search entry point. ' We call this method on a background thread Public OnSearchStart As ThreadStart ' start the search on a background thread Sub StartBackgroundSearch() If OnSearchStart Is Nothing Then Return _searchThread = New Thread(OnSearchStart) _searchThread.Start() End Sub ' End Class The Coordinator.OnSearchStart event is wired to NavigatorSearch.Start, which runs the actual search. Listing 11-15 and Listing 11-16 show a summary of the C# and VB .NET implementations of NavigatorSearch.

Buffer reads are much faster than reads from disk The all-important principle in appropriately sizing the buffer cache is summarized in the phrase touch as few blocks as possible, since disk I/Os necessary for reading data from Oracle blocks on disk are more time consuming than reading the data from the SGA This is why the buffer cache hit ratio, which measures the percentage of time users accessed the data they needed from the buffer cache (rather than requiring a disk read), is such an important indicator of performance of the Oracle instance You derive the buffer cache hit ratio as follows: hit rate = (1 (physical reads)/(logical reads)) * 100 In this calculation, the physical and logical reads (reads from disk and from memory, respectively) are accumulated from the start of the Oracle instance.

So if you calculate the ratio on Monday morning after a restart on Sunday night, it will show a very low hit ratio As the week progresses, the hit ratio could increase dramatically, because as more read requests come in, Oracle satisfies them with the data that is already in memory Unfortunately, Oracle does not give you any reliable rules or guidelines to indicate how much memory you should allocate for your buffer cache ratio or the SGA Some trial and error with data loads should give you a good idea about the right size In 20, I present much more information on the tuning of the database buffer cache A high buffer cache hit ratio doesn t always correlate with superior database performance It is entirely possible for your database to have a very high hit ratio say, in the high 90s and still have a performance problem.

For example, even if your total logical reads and hit ratio are high, your SQL queries could still be inefficient..

Listing 11-15. The C# Implementation of NavigatorSearch public class NavigatorSearch : System.Windows.Forms.UserControl { int itemsFound; bool searching; bool stopRequested; public NavigatorSearch() { // This call is required by the Windows.Forms Form Designer. InitializeComponent(); } public void Start() { Cursor = Cursors.WaitCursor; itemsFound = 0; buttonSearch.Text = "Stop"; stopRequested = false; searching = true; DoSearch(textBoxLookIn.Text); searching = false; SearchFinished(); Cursor = Cursors.Default; } // recursive method void DoSearch(string theFolder) { if (!Directory.Exists(theFolder)) return; // search this folder string pattern = textBoxFilename.Text; foreach (string filePath in Directory.GetFiles(theFolder, pattern)) { itemsFound++; FireItemFound(filePath, itemsFound); } // search all subdirectories foreach (string directory in Directory.GetDirectories(theFolder)) { DoSearch(directory); if (stopRequested) { FireMessage(string.Format("{0} items found", itemsFound)); return; } } }