107 lines
6.8 KiB
HTML
107 lines
6.8 KiB
HTML
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<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="dc.date" scheme="iso8601" content="2005-09-19" />
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<meta name="keywords" content="description, catalog view, catalog, view,
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INFORMATION_SCHEMA" />
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<title>DB2 UDB for iSeries catalog views</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<body>
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<a id="Top_Of_Page" name="Top_Of_Page"></a><!-- Java sync-link -->
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<script language = "Javascript" src = "../rzahg/synch.js" type="text/javascript"></script>
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<a name="catalog"></a>
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<h1 id="catalog"><a href="rbafzmst02.htm#ToC_1512">Appendix F. DB2 UDB for iSeries catalog views</a></h1><a id="idx3479" name="idx3479"></a><a id="idx3480" name="idx3480"></a><a id="idx3481" name="idx3481"></a>
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<p>The views contained in a DB2 UDB for iSeries catalog are described in this section.
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The database manager maintains a set of tables containing information about
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the data in each relational database. These tables are collectively known
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as the <span class="italic">catalog</span>. The <span class="italic">catalog tables</span> contain information about tables, user-defined functions, distinct types, parameters,
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procedures, packages, views, indexes, aliases, sequences, constraints, triggers,
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and languages supported by DB2 UDB for iSeries. The catalog also contains information about
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all relational databases that are accessible from this system.</p>
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<p>There are three classes of catalog views:</p>
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<ul>
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<li>iSeries™ catalog tables and views
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<p>The iSeries catalog tables and views are modeled
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after the ANS and ISO catalog views, but are not identical to the ANS and
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ISO catalog views. These tables and views are compatible with prior releases
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of DB2 UDB for iSeries.</p>
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<p>These tables and views exist in schemas QSYS and QSYS2.</p>
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<p>The catalog tables and views contain information about all tables, parameters,
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procedures, functions, distinct types, packages, views, indexes, aliases, sequences,
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triggers, and constraints in the entire relational database. When an SQL schema
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is created, an additional set of these views (except SYSPARMS, SYSPROCS, SYSFUNCS,
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SYSROUTINES, SYSROUTINEDEP, and SYSTYPES) are created into the schema that
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only contain information about tables, packages, views, indexes, and constraints
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in that schema.</p></li>
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<li>ODBC and JDBC catalog views
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<p>The ODBC and JDBC catalog views are designed
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to satisfy ODBC and JDBC metadata API requests. For example, SQLCOLUMNS. These
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views are compatible with views on DB2 UDB for z/OS and DB2 UDB LUW Version 8. These views
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will be modified as ODBC or JDBC enhances or modifies their metadata APIs.</p>
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<p>These views exist in schema SYSIBM.</p></li>
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<li>ANS and ISO catalog views
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<p>The ANS and ISO catalog views are designed
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to comply with the ANS and ISO SQL standard (the Information Schema catalog
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views). These views will be modified as the ANS and ISO standard is enhanced
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or modified.</p>
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<p>There are several columns in these views that are reserved
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for future standard enhancements.</p>
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<p>There are two versions of these views:</p>
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<ul><a id="idx3482" name="idx3482"></a>
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<li>The first version of these views exist in schema INFORMATION_SCHEMA<sup class="fn"><a id="wq2159" name="wq2159" href="rbafzmstcatalog.htm#wq2160">109</a></sup>. Only rows associated with
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objects to which the user has some privilege are included in the views. This
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version is compatible with the ANS and ISO SQL standard.
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<p>If you use of this
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set of catalog views to prevent users from seeing any information about objects
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to which they have no privilege, you should revoke privileges to the other
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catalog views from users and PUBLIC.</p></li>
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<li>The second version of these views exist in schema SYSIBM. All rows are
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included in these views whether or not the user has some privilege to the
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objects associated with rows in the views. These views are compatible with
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views on DB2 UDB LUW Version 8 and will generally perform better than the ANS and
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ISO views in QSYS2.</li></ul>
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<p>For example, assume that a user has the SELECT privilege to the
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QSYS2.TABLES and SYSIBM.TABLES catalog views but does not have any privilege
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to a table called WORK.EMPLOYEE. The following SQL statement will not return
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a result row: </p>
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<pre class="xmp"> <span class="bold">SELECT *</span>
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<span class="bold">FROM</span> QSYS2.TABLES
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<span class="bold">WHERE</span> TABLE_SCHEMA = 'WORK' <span class="bold">AND</span> TABLE_NAME = 'EMPLOYEE' </pre><p class="indatacontent">However, the following
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SQL statement will return a result row: </p>
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<pre class="xmp"> <span class="bold">SELECT *</span>
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<span class="bold">FROM</span> SYSIBM.TABLES
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<span class="bold">WHERE</span> TABLE_SCHEMA = 'WORK' <span class="bold">AND</span> TABLE_NAME = 'EMPLOYEE' </pre></li></ul>
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<a name="wq2161"></a>
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<div class="notetitle" id="wq2161">Note:</div>
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<div class="notebody">Some of these views use special catalog functions as part
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of the view definition. These functions exist in SYSIBM, but should not be
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used directly in applications. The functions are created for specific independent
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auxiliary storage pools (IASP) and will likely change in future releases.</div>
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<hr /><div class="fnnum"><a id="wq2160" name="wq2160" href="rbafzmstcatalog.htm#wq2159">109</a>.</div>
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<div class="fntext">INFORMATION_SCHEMA is the ANS and ISO SQL standard schema name that contains
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catalog views. It is a synonym for QSYS2.</div>
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<br />
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<hr /><br />
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[ <a href="#Top_Of_Page">Top of Page</a> | <a href="rbafzmstsidvals.htm">Previous Page</a> | <a href="rbafzmstcatalognotes.htm">Next Page</a> | <a href="rbafzmst02.htm#wq1">Contents</a> |
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<a href="rbafzmstindex.htm#index">Index</a> ]
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<a id="Bot_Of_Page" name="Bot_Of_Page"></a>
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</body>
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</html>
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