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 - Database Objects </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="Comments within SQL statements do not affect the statement execution, but they may make your application easier for you to read and maintain. You may want to include a comment in a statement that describes the statement's purpose within your application. "> <META NAME="keywords" content="Comments,sql ,sql tutorial, plsql tutorial,oracle dba tutorial,oracle dba"> <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"> SQL - Database Objects </h1><BR> <!-- <table> <tr> <td> --> <a href="comments.html">Previous Chapter </a> | <a href="schema_objects.html">Next Chapter </a> <BR><BR> </font > <!-- <IMG SRC="character-set.gif" WIDTH="599" HEIGHT="410" BORDER="0" ALT=""><BR><BR> --> <!-- </td> <td> --> <!-- </td> </tr> </table> --> <font face="tahoma" size="2" > Oracle recognizes objects that are associated with a particular schema and objects that are not associated with a particular schema, as described in the sections that follow.<BR><BR> <H5>Schema Objects</H5> A schema is a collection of logical structures of data, or schema objects. A schema is owned by a database user and has the same name as that user. Each user owns a single schema. Schema objects can be created and manipulated with SQL and include the following types of objects:<BR><BR> * Clusters<BR><BR> * Constraints<BR><BR> * Database links<BR><BR> * Database triggers<BR><BR> * Dimensions<BR><BR> * External procedure libraries<BR><BR> * Index-organized tables<BR><BR> * Indexes<BR><BR> * Indextypes<BR><BR> * Java classes, Java resources, Java sources<BR><BR> * Materialized views<BR><BR> * Materialized view logs<BR><BR> * Object tables<BR><BR> * Object types<BR><BR> * Object views<BR><BR> * Operators<BR><BR> * Packages<BR><BR> * Sequences<BR><BR> * Stored functions, stored procedures<BR><BR> * Synonyms<BR><BR> * Tables<BR><BR> * Views<BR><BR> <H5>Nonschema Objects</H5> Other types of objects are also stored in the database and can be created and manipulated with SQL but are not contained in a schema:<BR><BR> * Contexts<BR><BR> * Directories<BR><BR> * Parameter files (PFILEs) and server parameter files (SPFILEs)<BR><BR> * Profiles<BR><BR> * Roles<BR><BR> * Rollback segments<BR><BR> * Tablespaces<BR><BR> * Users <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 = "000000"; google_color_url = "000000"; google_color_text = "000000"; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script><p> <H5>Parts of Schema Objects</H5> Some schema objects are made up of parts that you can or must name, such as: <BR><BR> * Columns in a table or view <BR><BR> * Index and table partitions and subpartitions <BR><BR> * Integrity constraints on a table <BR><BR> * Packaged procedures, packaged stored functions, and other objects stored within a package <BR><BR> <H5>Partitioned Tables and Indexes</H5> Tables and indexes can be partitioned. When partitioned, these schema objects consist of a number of parts called partitions, all of which have the same logical attributes. For example, all partitions in a table share the same column and constraint definitions, and all partitions in an index share the same index columns. <BR><BR> When you partition a table or index using the range method, you specify a maximum value for the partitioning key column(s) for each partition. When you partition a table or index using the list method, you specify actual values for the partitioning key column(s) for each partition. When you partition a table or index using the hash method, you instruct Oracle to distribute the rows of the table into partitions based on a system-defined hash function on the partitioning key column(s). When you partition a table or index using the composite-partitioning method, you specify ranges for the partitions, and Oracle distributes the rows in each partition into one or more hash subpartitions based on a hash function. Each subpartition of a table or index partitioned using the composite method has the same logical attributes. <BR><BR> <H5>Partition-Extended and Subpartition-Extended Names</H5> Partition-extended and subpartition-extended names let you perform some partition-level and subpartition-level operations, such as deleting all rows from a partition or subpartition, on only one partition or subpartition. Without extended names, such operations would require that you specify a predicate (WHERE clause). For range- and list-partitioned tables, trying to phrase a partition-level operation with a predicate can be cumbersome, especially when the range partitioning key uses more than one column. For hash partitions and subpartitions, using a predicate is more difficult still, because these partitions and subpartitions are based on a system-defined hash function. <BR><BR> Partition-extended names let you use partitions as if they were tables. An advantage of this method, which is most useful for range-partitioned tables, is that you can build partition-level access control mechanisms by granting (or revoking) privileges on these views to (or from) other users or roles.To use a partition as a table, create a view by selecting data from a single partition, and then use the view as a table. <BR><BR> You can specify partition-extended or subpartition-extended table names for the following DML statements: <BR><BR> * DELETE <BR><BR> * INSERT <BR><BR> * LOCK TABLE <BR><BR> * SELECT <BR><BR> * UPDATE <BR><BR> <B>Syntax</B> <BR><BR> The basic syntax for using partition-extended and subpartition-extended table names is: <BR><BR> partition_extended_name::= <BR><BR> <IMG SRC="database_objects.gif" WIDTH="688" HEIGHT="118" BORDER="0" ALT="Partition Extended Name"> <BR><BR> <H5>Restrictions</H5> Currently, the use of partition-extended and subpartition-extended table names has the following restrictions: <BR><BR> * No remote tables: A partition-extended or subpartition-extended table name cannot contain a database link (dblink) or a synonym that translates to a table with a dblink. To use remote partitions and subpartitions, create a view at the remote site that uses the extended table name syntax and then refer to the remote view. <BR><BR> * No synonyms: A partition or subpartition extension must be specified with a base table. You cannot use synonyms, views, or any other objects. <BR><BR> Example <BR><BR> In the following statement, sales is a partitioned table with partition jan97. You can create a view of the single partition jan97, and then use it as if it were a table. This example deletes rows from the partition. <BR><BR> CREATE VIEW sales_Q1_2000 AS<BR> SELECT * FROM sales PARTITION (Q1_2000); <BR><BR> DELETE FROM sales_Q1_2000 WHERE amount < 0; <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 = "000000"; google_color_url = "000000"; google_color_text = "000000"; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script> <p> <a href="comments.html">Previous Chapter </a> | <a href="schema_objects.html">Next Chapter </a> <BR><BR> <a href = "http://learnoracle.activeboard.com/forum.spark?aBID=122598&p=3&topicID=29780100">Discuss <B>Database Objects</B></a> | <A HREF="http://oracleonline.info"> <B>More Tutorials on Oracle dba</B></A> | Source : Oracle Documentation</FONT> <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"> <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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Bookmarking code ends here --> <BR><BR> <BR><BR> <p align="center"> <font face="tahoma" size="2" size="2">Want to share or request more about <B>Database Objects</B> to become a <B>Oracle DBA</B>. Direct your requests to<a href="mailto:webmaster@oracleonline.info" alt='Learn oracle sql plan'> webmaster@oracleonline.info</a></font></p> </td> </tr> </table> </div> </div> </div> </div> </div> </div> </div> </th> </tr> </table> </body> </html>