ÿþ<html> <head> <meta http-equiv="Content-Language" content="en-us"> <meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <title>Oracle DBA - How Oracle works </title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <link href="style.css" rel="stylesheet" type="text/css"> <META NAME="description" content="The following example describes the most basic level of operations that Oracle performs. This illustrates an Oracle configuration where the Oracle DBA and associated server process are on separate computers (connected through a network). Learn more about Oracle DBA "> <META NAME="keywords" content="How oracle works,Oracle Database Architecture,Oracle Database,Oracle dba,Oracle dba tutorial, Oracle dba interview Question,sql tutorial, PL/SQL Tutorial"> <script type="text/javascript" language="javascript" src="includes/sniffer.js"></script><script type="text/javascript" language="javascript1.2" src="includes/custom.js"></script><script type="text/javascript" language="javascript1.2" src="includes/style.js"></script></head> <body link = "black" topmargin=0 leftmargin=0><script type="text/javascript" language="javascript1.2" src="includes/menu.js"></script> <script src="http://www.google-analytics.com/urchin.js" type="text/javascript"> </script> <script type="text/javascript"> _uacct = "UA-4671442-1"; urchinTracker(); </script> <table align=left border="1" width="100%" id="table1" height="503" cellspacing="1" cellpadding="0"> <tr> <td height="60" bgcolor="E7EFE7" colspan="3" align="Left" valign="top"> <IMG SRC="learn-oracle-header/learn-oracle.jpg" WIDTH="1000" HEIGHT="91" BORDER="0" ALT="learn-oracle"> </tr> <tr> <td width="160" align="left" valign="top" bgcolor="E7EFE7" > <script type="text/javascript"><!-- google_ad_client = "pub-4228419744604469"; google_ad_width = 160; google_ad_height = 600; google_ad_format = "160x600_as"; google_ad_type = "text_image"; google_ad_channel =""; google_color_border = "E7EFE7"; google_color_bg = "E7EFE7"; google_color_link = "0000ff"; google_color_url = "000000"; google_color_text = "000000"; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> <BR><BR> <B> <!--%2Chttp%3A%2F%2Fwww.sdparanormal.com%2Ff%2FParanormal_News_Feed.xml --> <!-- RSS News End --> </td> <td align="left" valign="top" bgcolor="E7EFE7" bordercolor="#99CCFF"style="border-style: solid; border-width: 1px; padding-left: 8px; padding-right: 4px; padding-top: 1px; padding-bottom: 1px> <div id="wrapper"> <div id="body"> <div> <div> <div> <div class="inner"> <div class="indent"> <p ></B> <font face="tahoma" size="2" size="2" color="#435C7D"> <BR><BR><BR> <h1 align="center"> How oracle works </h1> <BR> <FONT FACE='tahoma' size='2' > <a href="http://oracleonline.info/Oracle_architecture.html"><U><B>PREVIOUS CHAPTER</B></U></a>&nbsp;|&nbsp;<a href="http://oracleonline.info/check_prereq.html"><U><B>NEXT CHAPTER</B></U></a><br><BR> </FONT> <table border="0" width="99%" id="table2" cellpadding="5"> <tr> <td width="0"><p> <font face="Tahoma" size="2"> The following example describes the most basic level of operations that Oracle performs. This illustrates an Oracle configuration where the <b> Oracle DBA </b> and associated server process are on separate computers (connected through a network).<BR><BR> <OL> <LI>An instance has started on the computer running Oracle (often called the host or <B>database</B> server).<BR><BR> <LI>A computer running an application (a local computer or client workstation) runs the application in a <b> Oracle DBA </b> process. The client application attempts to establish a connection to the server using the proper Oracle Net Services driver.<BR><BR> <LI>The server is running the proper Oracle Net Services driver. The server detects the connection request from the application and creates a dedicated server process on behalf of the <b> Oracle DBA </b> process.<BR><BR> <LI>The <b> Oracle DBA </b> runs a SQL statement and commits the transaction. For example, the <b> Oracle DBA </b> changes a name in a row of a table.<BR><BR> <script type="text/javascript"><!-- google_ad_client = "pub-4228419744604469"; google_ad_width = 728; google_ad_height = 90; google_ad_format = "728x90_as"; google_ad_type = "text_image"; google_ad_channel =""; google_color_border = "E7EFE7"; google_color_bg = "E7EFE7"; google_color_link = "0000ff"; google_color_url = "000000"; google_color_text = "000000"; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script><p> <font face="tahoma" size="2" > <BR><BR> <LI>The server process receives the statement and checks the shared pool for any shared SQL area that contains a similar SQL statement. If a shared SQL area is found, then the server process checks the <b> Oracle DBA </b>'s access privileges to the requested data, and the previously existing shared SQL area is used to process the statement. If not, then a new shared SQL area is allocated for the statement, so it can be parsed and processed.<BR><BR> <LI>The server process retrieves any necessary data values from the actual datafile (table) or those stored in the SGA.<BR><BR> <LI>The server process modifies data in the system global area. The DBWn process writes modified blocks permanently to disk when doing so is efficient. Because the transaction is committed, the LGWR process immediately records the transaction in the redo log file.<BR><BR> <LI>If the transaction is successful, then the server process sends a message across the network to the application. If it is not successful, then an error message is transmitted.<BR><BR> <LI>Throughout this entire procedure, the other background processes run, watching for conditions that require intervention. In addition, the <B>database</B> server manages other users' transactions and prevents contention between transactions that request the same data.<BR><BR> </OL> <script type="text/javascript"><!-- google_ad_client = "pub-4228419744604469"; google_ad_width = 728; google_ad_height = 90; google_ad_format = "728x90_as"; google_ad_type = "text_image"; google_ad_channel =""; google_color_border = "E7EFE7"; google_color_bg = "E7EFE7"; google_color_link = "0000ff"; google_color_url = "000000"; google_color_text = "000000"; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> <p> <FONT FACE='tahoma' size='2' > <a href="http://oracleonline.info/Oracle_architecture.html"><U><B>PREVIOUS CHAPTER</B></U></a>&nbsp;|&nbsp;<a href="http://oracleonline.info/check_prereq.html"><U><B>NEXT CHAPTER</B></U></a><br><BR> </FONT> <P> <TABLE border="0"> <TR> <td width="280" bgcolor="#AAD4FF" align="left" valign="top" bordercolor="#FFFFFF"> <b><font face="Tahoma" size="2"><B><CENTER>STEP 1 - Next Topics</CENTER></B></font> </tr> <tr> <td width="280" bgcolor="#ccffff" align="left" valign="top" bordercolor="#FFFFFF"> <b><font face="arial" size="1"> This contains a brief overview of <B>Oracle database</B> administration. Learn <B>Oracle DBA</B> Step 1 by clicking links below:</font> </TD> </tr> <TR > <TD width="280"><font face="Tahoma" size="2"> <a href="http://oracleonline.info/Oracle_database.html">What is a Oracle Database?</a><IMG SRC="tick.gif" WIDTH="20" HEIGHT="24" BORDER="0" ALT="Oracle DBA"></TD> </TR> <TR> <TD width="280"><font face="Tahoma" size="2"><a href="http://oracleonline.info/DBA_task.html">Common <B>Oracle DBA</B> Tasks</a><IMG SRC="tick.gif" WIDTH="20" HEIGHT="24" BORDER="0" ALT="Oracle DBA"></TD> </TR> <TR> <TD width="280"><font face="Tahoma" size="2"><a href="http://oracleonline.info/Oracle_utilities.html">Tools for Administering the Database</a><IMG SRC="tick.gif" WIDTH="20" HEIGHT="24" BORDER="0" ALT="Oracle DBA"></TD> </TR> <TR> <TD width="280"><font face="Tahoma" size="2"><a href="http://oracleonline.info/Oracle_architecture.html"><B>Oracle Database</B> Architecture</a><IMG SRC="tick.gif" WIDTH="20" HEIGHT="24" BORDER="0" ALT="Oracle DBA"></TD> </TR> <TR> <TD width="280"><font face="Tahoma" size="2"><a href="http://oracleonline.info/how_oracle_Works.html">How Oracle Works</a><IMG SRC="tick.gif" WIDTH="20" HEIGHT="24" BORDER="0" ALT="Oracle DBA"></TD> </TR> </TABLE> <!-- <a href = "http://learnoracle.activeboard.com/index.spark?forumID=122598&p=3&topicID=27926969">Discuss Article</a><br><br> --> <!-- <font face="tahoma" size="2" size="2"> <B><U>More Articles</U></B><BR><BR> 1. <a href="http://oracleonline.info/Advanced_queue.html">What Is Advanced Queuing?</a><br> 2. <a href="http://oracleonline.info/features_advanced_queue.html"> General Features of Advanced Queuing </a><br> 3. <a href="http://oracleonline.info/more_features_advanced_queue.html">Enqueue, Dequeue, Propagation Features of Advanced Queuing</a><br> 4. <a href="http://oracleonline.info/elements_advanced_queue.html">Elements of Advanced Queuing</a><br> 5. <a href="http://oracleonline.info/component_advanced_queue.html">Basic Components of Advanced Queuing</a><br><br> </font> --> </b><font face="tahoma" size="2" size="2"> <P> <A HREF="http://oracleonline.info"> <B>More Tutorials on Oracle dba ...</B></FONT></A> <BR> <BR> Source : Oracle Documentation <BR><BR> <!-- Social Bookmarking code starts here --> <!-- * Social Bookmark Script * @ Version 1.9 * @ Copyright (C) 2006-2008 by Alexander Hadj Hassine - All rights reserved * @ Website http://www.social-bookmark-script.com/ * @ * @ By using our script <b> Oracle DBA </b> must leave our copyright notices and the links * @ in the script untouched. 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