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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>Connecting Handling</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="oci8.examples.html">Examples</a></div> <div class="next" style="text-align: right; float: right;"><a href="oci8.datatypes.html">Supported Datatypes</a></div> <div class="up"><a href="book.oci8.html">OCI8</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div> <h1>Connecting Handling</h1> <p class="para">  The oci8 extension provides you with 3 different functions for  connecting to Oracle.  It is up to you to use the most appropriate  function for your application, and the information in this section is  intended to help you make an informed choice. </p> <p class="para">  Connecting to an Oracle server is a reasonably expensive operation, in  terms of the time that it takes to complete.  The <a href="function.oci-pconnect.html" class="function">oci_pconnect()</a>  function uses a persistent cache of connections that can be re-used  across different script requests.  This means that you will typically  only incur the connection overhead once per php process (or apache child). </p> <p class="para">  If your application connects to Oracle using a different set of  credentials for each web user, the persistent cache employed by  <a href="function.oci-pconnect.html" class="function">oci_pconnect()</a> will become less useful as the  number of concurrent users increases, to the point where it may  start to adversely affect the overall performance of your Oracle  server due to maintaining too many idle connections. If your  application is structured in this way, it is recommended that  you either tune your application using the <a href="oci8.configuration.html#ini.oci8.max_persistent" class="link">oci8.max_persistent</a> and <a href="oci8.configuration.html#ini.oci8.persistent_timeout" class="link">oci8.persistent_timeout</a>  configuration settings (these will give you control over the  persistent connection cache size and lifetime) or use  <a href="function.oci-connect.html" class="function">oci_connect()</a> instead. </p> <p class="para">  Both <a href="function.oci-connect.html" class="function">oci_connect()</a> and <a href="function.oci-pconnect.html" class="function">oci_pconnect()</a>  employ a connection cache; if you make multiple calls to  <a href="function.oci-connect.html" class="function">oci_connect()</a>, using the same parameters, in a  given script, the second and subsequent calls return the existing  connection handle.  The cache used by <a href="function.oci-connect.html" class="function">oci_connect()</a>  is cleaned up at the end of the script run, or when you explicitly close  the connection handle. <a href="function.oci-pconnect.html" class="function">oci_pconnect()</a> has similar  behaviour, although its cache is maintained separately and survives  between requests. </p> <p class="para">  This caching feature is important to remember, because it gives the  appearance that the two handles are not transactionally isolated (they  are in fact the same connection handle, so there is no isolation of any  kind).  If your application needs two separate, transactionally isolated  connections, you should use <a href="function.oci-new-connect.html" class="function">oci_new_connect()</a>. </p> <p class="para">  <a href="function.oci-new-connect.html" class="function">oci_new_connect()</a> always creates a new connection to  the Oracle server, regardless of what other connections might already exist.  High traffic web applications should try to avoid using  <a href="function.oci-new-connect.html" class="function">oci_new_connect()</a>, especially in the busiest sections of  the application. </p></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="oci8.examples.html">Examples</a></div> <div class="next" style="text-align: right; float: right;"><a href="oci8.datatypes.html">Supported Datatypes</a></div> <div class="up"><a href="book.oci8.html">OCI8</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>
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