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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>装入选项和文件类型修饰符</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr>   第 4 页（共10 页）</nobr></font></td>
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<p>前一页中介绍了一些装入选项和文件类型修饰符。这里讨论了另外几个：</p>
<p>
						
<b>装入选项：</b>
					
</p>
<ul>
<li>
							
<code>ROWCOUNT n</code>：允许用户指定只装入输入文件中的前 n 条记录。</li>
<li>
							
<code>SAVECOUNT n</code>：每装入 n 条记录之后就建立一致性点。同时会生成消息，并会将其记录在消息文件中，以指出在保存点成功地装入了多少输入行。这一点在输入文件类型为 CURSOR 时是无法做到的。</li>
<li>
							
<code>WARNINGCOUNT n</code>：在发出 n 次警告后停止装入。</li>
<li>
							
<code>INDEXING MODE [ REBUILD | INCREMENTAL | AUTOSELECT | DEFERRED ]</code>：在构建阶段，构建索引。这个选项指定 <code>LOAD</code>实用程序是重新构建索引还是增量式地扩展索引。支持四种不同方式：
							<ul>
<li>
									
<code>REBUILD</code> 方式强制重新构建所有索引。</li>
<li>
									
<code>INCREMENTAL</code> 方式只用新数据扩展索引。</li>
<li>
									
<code>AUTOSELECT</code> 方式允许实用程序在 <code>REBUILD</code> 和 <code>INCREMENTAL</code> 之间进行选择。</li>
<li>
									
<code>DEFERRED</code> 方式意味着在装入期间不创建索引。所涉及的索引都用需要的刷新进行标记。这些索引将在重新启动数据库或第一次访问这类索引时重新构建。</li>
</ul>
						
</li>
<li>
							
<code>STATISTICS [ YES | NO ]</code>：在执行完装入以后，以前的目标表统计信息极有可能不再有效，因为目标表中已加入了更多的数据。您可以通过指定 <code>STATISTICS YES</code> 来选择收集这些统计信息。</li>
</ul>
<p>
						
<b>文件类型修饰符。</b>文件类型修饰符是用 <code>MODIFIED BY</code> 子句指定的。下面是少数几个您可能会觉得有用的修饰符：</p>
<ul>
<li>
							
<code>fastparse</code>：减少了对装入数据的语法检查以增强性能。</li>
<li>
							
<code>identityignore</code>、<code>identitymissing</code> 和 <code>identityoverride</code>：分别用来忽略、指出丢失或覆盖标识列数据。</li>
<li>
							
<code>indexfreespace n</code>、<code>pagefreespace n</code> 和 <code>totalfreespace n</code>：在索引和数据页中保留指定量的空闲页。</li>
<li>
							
<code>norowwarnings</code>：禁止行警告。</li>
<li>
							
<code>lobsinfile</code>：指出将装入 LOB 文件；并检查 <code>LOBS FROM</code> 选项以获取 LOB 路径。</li>
</ul>
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