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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>Isolation and Lock Levels Supported</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#107077">17 The Informix Driver</a> : Isolation and Lock Levels Supported</div> <hr align="left" /> <blockquote> <div class="head_1"><a name="107077">Isolation and Lock Levels Supported</a></div> <div class="Body"><a name="107078">If connected to an Online Server, Informix supports isolation levels 0 (read uncommitted), 1 </a>(read committed), and 3 (serializable). The default is 1. The Standard Engine supports isolation level 0 (read uncommitted) only. </div> <div class="Body"><a name="107079">Informix also supports an alternative isolation level 1, called "cursor stability." Your ODBC </a>application can use this isolation level by calling SQLSetConnectAttr (1040,1).</div> <div class="Body"><a name="107080">Additionally, if transaction logging has not been enabled for your database, then </a>transactions are not supported by the driver (the driver is always in auto-commit mode).</div> <div class="Body"><a name="107081">Informix supports page-level and row-level locking.</a></div> <div class="Body"><a name="107085">Refer to </a><span class="Cross_ref_"><a href="javascript:WWHClickedPopup('reference', 'lock.09.1.html#106144', '');">Chapter 7 â??Locking and Isolation Levelsâ??</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> <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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