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<?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xml:lang="en" lang="en" xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <!-- MOTW-DISABLED saved from url=(0014)about:internet --> <title>Performance Considerations</title> <link rel="StyleSheet" href="css/informixcli.css" type="text/css" media="all" /> <link rel="StyleSheet" href="css/webworks.css" type="text/css" media="all" /> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/context.js"></script> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/towwhdir.js"></script> <script type="text/javascript" language="JavaScript1.2" src="wwhdata/common/wwhpagef.js"></script> <script type="text/javascript" language="JavaScript1.2"> <!-- var WebWorksRootPath = ""; // --> </script> <script type="text/javascript" language="JavaScript1.2"> <!-- // Set reference to top level help frame // var WWHFrame = WWHGetWWHFrame("", true); // --> </script> <script type="text/javascript" language="JavaScript1.2" src="scripts/expand.js"></script> </head> <body class="" style="background-color: #FFFFEE;" onload="WWHUpdate();" onunload="WWHUnload();" onkeydown="WWHHandleKeyDown((document.all||document.getElementById||document.layers)?event:null);" onkeypress="WWHHandleKeyPress((document.all||document.getElementById||document.layers)?event:null);" onkeyup="WWHHandleKeyUp((document.all||document.getElementById||document.layers)?event:null);"> <br /> <div class="WebWorks_Breadcrumbs" style="text-align: left;"> <a class="WebWorks_Breadcrumb_Link" href="informixcli.22.01.html#106746">17 The Informix Driver</a> : Performance Considerations</div> <hr align="left" /> <blockquote> <div class="head_1"><a name="106746">Performance Considerations</a></div> <div class="Body"><a name="154501">The following connection options can enhance driver performance. You can also enhance </a>performance through efficient application design. Refer to<span class="Cross_ref_"><a href="javascript:WWHClickedPopup('reference', 'design.07.1.html#106796', '');"> </a></span><span class="Cross_ref_"><a href="javascript:WWHClickedPopup('reference', 'design.07.1.html#106796', '');">Chapter 5 â??Designing ODBC Applications for Performance Optimizationâ?? </a></span>in the <span class="Emphasis">DataDirect Connect Series </span><span class="forbody">for</span> <span class="Emphasis" style="font-size: 8.0pt;">ODBC</span><span class="Emphasis" style="font-size: 10.0pt;"> </span><span class="Emphasis" style="font-size: 10.0pt;">Reference</span> for details.</div> <div class="Body"><span class="Action_bold"><a name="154513">Application Using Threads (ApplicationUsingThreads)</a></span>: The driver coordinates concurrent database operations (operations from different threads) by acquiring locks. Although locking prevents errors in the driver, it also decreases performance. If your application does not make ODBC calls from different threads, the driver has no reason to coordinate operations. In this case, the ApplicationUsingThreads attribute should be disabled (set to 0).</div> <div class="Body"><a name="154514">NOTE: If you are using a multi-threaded application, you must enable the Application Using </a>Threads option.</div> <div class="Body"><span class="Action_bold"><a name="131358">Cancel Detect Interval (CancelDetectInterval)</a></span>: If your application uses threads, it may allow canceling of long running queries (may issue synchronous SQLCancel calls). If your application does not issue synchronous SQLCancel calls, the driver can improve performance if Cancel Detect Interval is disabled (set to 0). In this case, the driver does not incur the overhead of periodically checking for SQLCancel. In the case where your application does issue synchronous SQLCancel calls, this option should be set to a value that specifies how often the driver checks to see if a long running query has been canceled.</div> <script type="text/javascript" language="JavaScript1.2"> <!-- // Clear related topics // WWHClearRelatedTopics(); document.writeln(WWHRelatedTopicsInlineHTML()); // --> </script> </blockquote> <script type="text/javascript" language="JavaScript1.2"> <!-- document.write(WWHRelatedTopicsDivTag() + WWHPopupDivTag() + WWHALinksDivTag()); // --> </script> </body> </html>
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