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<a name="navskip"></a><td height="25" colspan="4"><img alt="2.创建数据库" src="imagemaster/titlebar2.jpg" border="0" height="25" width="562"></td>
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<td width="90%"><font size="4" face="Verdana, Arial, Helvetica"><b>目录结构</b></font></td><td width="200" align="right"><font size="1" face="Verdana, Arial, Helvetica"><nobr> 第 6 页（共11 页）</nobr></font></td>
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<p>
<code>create database</code> 命令允许您根据操作系统来指定在哪个驱动器或目录上创建数据库。</p>
<ul>
<li>如果没有指定驱动器或目录，那么就在 DFTDBPATH 实例（数据库管理器）配置参数所指定的路径上创建数据库。</li>
<li>如果没有指定驱动器或目录，而且也没设置 DFTDBPATH 实例级的配置参数，那么就在执行 <code>create database</code> 命令的驱动器或路径上创建该数据库。</li>
</ul>
<p>
<code>create database</code> 命令创建了一系列子目录，如下图所示：</p>
<img src="images/createdb.jpg" alt="用 CREATE DATABASE 命令创建的目录结构"><p>第一个子目录根据在其中创建数据库的实例的所有者命名。在这个子目录下，DB2 创建了一个目录，指出在哪个数据库分区中创建数据库。</p>
<p>
对于未分区数据库，目录将是 <code>NODE0000</code>。对于分区数据库，目录将命名为 <code>NODExxxx</code>，其中 <code>xxxx</code> 将是由四位数字组成的数据库实例的分区号，就如 <code>db2nodes.cfg</code> 文件中指明的那样。
例如，对于分区号 43，目录会是 <code>NODE0043</code>。</p>
<p>请注意在 Windows 中，实例实际上没有实例所有者，因此实例名（例如 DB2）将用来替代实例所有者的标识。</p>
<p>由于在同一驱动器或目录上可以创建多个数据库，因此每个数据库都必须拥有自己唯一的子目录。
在 <code>NODExxxx</code> 目录下，在该驱动器／目录上创建的每个数据库都会有一个 <code>SQLxxxxx</code> 目录。例如，假定我们有两个数据库：MYDB 和 SAMPLE，它们都是在 Windows 系统的 <code>C:</code> 驱动器上创建的。将有两个目录：<code>SQL00001</code> 和 <code>SQL00002</code>。</p>
<p>为了确定在哪个目录下创建了数据库，请输入命令 <code>list database directory on C:</code>。这条命令会产生类似下面这样的输出：</p>
<img src="images/dbdir.jpg" alt="数据库目录"><p>在上面的示例中，在 <code>NODExxxx</code> 目录下的 <code>SQL00001</code> 目录中创建数据库 SAMPLE，而在 <code>NODExxxx</code> 目录下的 <code>SQL00002</code> 目录中创建数据库 MYDB。</p>
<p>缺省情况下：</p>
<ul>
<li>系统目录表空间（SYSCATSPACE）将使用目录 <code>SQLT0000.0</code>
</li>
<li>系统临时表空间（TEMPSPACE1）将使用目录 <code>SQLT0001.0</code>
</li>
<li>缺省的用户表空间（USERSPACE1）将使用目录 <code>SQLT0002.0</code>。</li>
</ul>
<p>还有一个名为 <code>SQLOGDIR</code> 的子目录，用于保存数据库日志文件。这是保存日志文件的缺省位置，但是一旦创建了数据库就可以更改该位置。</p>
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