179 lines
9.4 KiB
HTML
179 lines
9.4 KiB
HTML
<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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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.language" scheme="rfc1766" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<meta name="dc.date" scheme="iso8601" content="2005-09-19" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow"/>
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<title>Notes</title>
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<link rel="stylesheet" type="text/css" href="ibmidwb.css" />
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<link rel="stylesheet" type="text/css" href="ic.css" />
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</head>
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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="catalognotes"></a>
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<h2 id="catalognotes"><a href="rbafzmst02.htm#ToC_1513">Notes</a></h2>
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<p><span class="bold">Names in the Catalog:</span> In general, all names stored
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in columns of a catalog table are undelimited and case sensitive. For example,
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assume the following table was created: </p>
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<pre class="xmp"> <span class="bold">CREATE TABLE</span> "colname"/"long_table_name"
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("long_column_name" <span class="bold">CHAR</span>(10),
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INTCOL <span class="bold">INTEGER</span>) </pre><p class="indatacontent">If
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the following select statement is used to return information about the mapping
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between SQL names and system names, the following select statement could be
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used: </p>
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<pre class="xmp"> <span class="bold">SELECT</span> TABLE_NAME, SYSTEM_TABLE_NAME, COLUMN_NAME, SYSTEM_COLUMN_NAME
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<span class="bold">FROM</span> QSYS2/SYSCOLUMNS
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<span class="bold">WHERE</span> TABLE_NAME = 'long_table_name' <span class="bold">AND</span>
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TABLE_SCHEMA = 'colname'</pre><p class="indatacontent">The following rows would be returned:</p>
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<a name="wq2162"></a>
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<table id="wq2162" width="100%" summary="" border="0" frame="void" rules="all">
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<thead valign="bottom">
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<tr>
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<th id="wq2163" width="19%" align="left" valign="bottom">TABLE_NAME</th>
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<th id="wq2164" width="25%" align="left" valign="bottom">SYSTEM_TABLE_NAME</th>
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<th id="wq2165" width="24%" align="left" valign="bottom">COLUMN_NAME</th>
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<th id="wq2166" width="30%" align="left" valign="bottom">SYSTEM_COLUMN_NAME</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr>
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<td align="left" valign="top" headers="wq2163">long_table_name</td>
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<td align="left" valign="top" headers="wq2164">"long0001"</td>
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<td align="left" valign="top" headers="wq2165">long_column_name</td>
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<td align="left" valign="top" headers="wq2166">LONG_00001</td>
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</tr>
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<tr>
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<td align="left" valign="top" headers="wq2163">long_table_name</td>
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<td align="left" valign="top" headers="wq2164">"long0001"</td>
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<td align="left" valign="top" headers="wq2165">INTCOL</td>
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<td align="left" valign="top" headers="wq2166">INTCOL</td>
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</tr>
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</tbody>
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</table>
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<p><span class="bold">System Names in the Catalog:</span> In general, the longer
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SQL column names should be used rather than the short system column names.
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The short system column names for iSeries™ catalog tables and views are explicitly
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maintained for compatibility with prior releases and other DB2® UDB products.
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The short system column names for the ODBC and JDBC catalog views and the
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ANS and ISO catalog views are not explicitly maintained and may change between
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releases.</p>
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<p><span class="bold">Null Values in the Catalog:</span> If the information in
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a column is not applicable, the null value is returned. Using the table created
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above, the following select statement, which queries the NUMERIC_SCALE and
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the CHARACTER_MAXIMUM_LENGTH, would return the null value when the data was
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not applicable to the data type of the column. </p>
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<pre class="xmp"> <span class="bold">SELECT</span> COLUMN_NAME, NUMERIC_SCALE, CHARACTER_MAXIMUM_LENGTH
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<span class="bold">FROM</span> QSYS2/SYSCOLUMNS
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<span class="bold">WHERE</span> TABLE_NAME = 'long_table_name' <span class="bold">AND</span>
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TABLE_SCHEMA = 'colname'</pre>
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<p>The following rows would be returned: </p>
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<a name="wq2167"></a>
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<table id="wq2167" width="100%" summary="" border="0" frame="void" rules="all">
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<thead valign="bottom">
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<tr>
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<th id="wq2168" width="30%" align="left" valign="bottom">COLUMN_NAME</th>
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<th id="wq2169" width="29%" align="left" valign="bottom">NUMERIC_SCALE</th>
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<th id="wq2170" width="40%" align="left" valign="bottom">CHARACTER_MAXIMUM_LENGTH</th>
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</tr>
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</thead>
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<tbody valign="top">
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<tr>
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<td align="left" valign="top" headers="wq2168">long_column_name</td>
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<td align="left" valign="top" headers="wq2169">?</td>
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<td align="left" valign="top" headers="wq2170">10</td>
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</tr>
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<tr>
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<td align="left" valign="top" headers="wq2168">INTCOL</td>
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<td align="left" valign="top" headers="wq2169">0</td>
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<td align="left" valign="top" headers="wq2170">?</td>
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</tr>
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</tbody>
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</table>
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<p>Because numeric scale is not valid for a character column, the null value
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is returned for NUMERIC_SCALE for the "long_column_name" column. Because character
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length is not valid for a numeric column, the null value is returned for CHARACTER_MAXIMUM_LENGTH
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for the INTCOL column.</p>
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<p><span class="bold">Install and Backup Considerations:</span> Certain catalog
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tables and any views created over the catalog tables and views should be regularly
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saved:</p>
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<ul>
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<li>The catalog table QSYS.QADBXRDBD contains relational database information.
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This table should be regularly saved.</li>
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<li>When an ILE external function or procedure or an SQL function or procedure
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is restored, information is automatically inserted into these catalog tables.
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This does not occur for non-ILE external functions and procedures. In order
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to back up the definitions of non-ILE external functions or procedures, ensure
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that the catalog tables SYSROUTINES and SYSPARMS are saved or ensure you have
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a back up of the SQL source statements that were used to create these functions
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and procedures.</li>
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<li>All catalog views in the QSYS2 or SYSIBM schemas are system objects. This
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means that any user views created over these catalog views must be deleted
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when the operating system is installed. All dependent objects must be deleted
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as well. To avoid this requirement, you can save views before installation
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and then restore them afterwards.</li>
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<li>Catalog tables in the QSYS library are also system objects. However, the
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catalog tables in the QSYS library are not deleted during installation. Hence,
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any views created over these tables are preserved throughout the installation
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process.</li></ul>
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<p><span class="bold">Granting Privileges to Catalog Views:</span> Tables and
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views in the catalog are like any other database tables and views. If you
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have authorization, you can use SQL statements to look at data in the catalog
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views in the same way that you retrieve data from any other table. The tables
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and views in the catalogs are shipped with the SELECT privilege to PUBLIC.
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This privilege may be revoked and the SELECT privilege granted to individual
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users.</p>
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<p><span class="bold">QSYS Catalog Tables:</span> Most of the catalog views are
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based on the following tables in the QSYS library (sometimes called the database
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cross reference files). These tables are not shipped with the SELECT privilege
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to PUBLIC and should not be used directly: </p>
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<a name="wq2171"></a>
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<table id="wq2171" width="100%" summary="" border="0" frame="void" rules="none">
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<tbody valign="top">
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<tr>
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<td width="33%" align="left" valign="top">QADBCCST</td>
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<td width="33%" align="left" valign="top">QADBKFLD</td>
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<td width="33%" align="left" valign="top">QADBXSFLD</td>
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</tr>
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<tr>
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<td align="left" valign="top">QADBFDEP</td>
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<td align="left" valign="top">QADBPKG</td>
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<td align="left" valign="top">QADBXTRIGB</td>
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</tr>
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<tr>
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<td align="left" valign="top">QADBFCST</td>
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<td align="left" valign="top">QADBXRDBD</td>
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<td align="left" valign="top">QADBXTRIGC</td>
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</tr>
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<tr>
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<td align="left" valign="top">QADBIFLD</td>
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<td align="left" valign="top">QADBXREF</td>
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<td align="left" valign="top">QADBXTRIGD</td>
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</tr>
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</tbody>
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</table>
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<p><span class="bold">Use of SELECT *:</span> New columns are likely to be added
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to tables and views in the catalog as new functionality is implemented and
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as the ISO/ANSI standards evolve. For this reason, it is recommended that
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SELECT * not be used when accessing catalog tables and views unless your application
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is prepared to tolerate these new columns.</p>
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<hr /><br />
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[ <a href="#Top_Of_Page">Top of Page</a> | <a href="rbafzmstcatalog.htm">Previous Page</a> | <a href="rbafzmstcatalogtbls.htm">Next Page</a> | <a href="rbafzmst02.htm#wq1">Contents</a> |
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