Update ref/create_tablespace.sgml-200602

——row178至179，调整英文内容为：
        must exist (<command>CREATE TABLESPACE</command> will not create it),
        should be empty, and must be owned by the
——row185，调整中文内容为：
        要被用于表空间的目录。该目录必需存在（<command>CREATE TABLESPACE</command> 将不创建它），应该为空，并且必须由

——row263至271，调整英文内容为：
   To create a tablespace <literal>dbspace</literal> at file system location
   <literal>/data/dbs</literal>, first create the directory using operating
   system facilities and set the correct ownership:
<programlisting>
mkdir /data/dbs
chown postgres:postgres /data/dbs
</programlisting>
   Then issue the tablespace creation command inside
   <productname>PostgreSQL</productname>:
——row278至284，调整中文内容为：
   要在文件系统位置<literal>/data/dbs</literal>创建表空间<literal>dbspace</literal>，请首先使用操作系统工具创建目录并设置正确的所有权：
<programlisting>
mkdir /data/dbs
chown postgres:postgres /data/dbs
</programlisting>
   然后在内部发出表空间创建命令
   <productname>PostgreSQL</productname>:

——row292至293，调整英文内容为：
   To create a tablespace owned by a different database user, use a command
   like this:
——row299，调整中文内容为：
   要创建由不同数据库用户拥有的表空间，可用类似这样的命令：

Author: gpobs

postgresql/doc/src/sgml/ref/create_tablespace.sgml

@@ -175,13 +175,14 @@ ____________________________________________________________________________-->
 <!--==========================orignal english content==========================
        <para>
         The directory that will be used for the tablespace. The directory
-        should be empty and must be owned by the
+        must exist (<command>CREATE TABLESPACE</command> will not create it),
+        should be empty, and must be owned by the
         <productname>PostgreSQL</productname> system user.  The directory must be
         specified by an absolute path name.
        </para>
 ____________________________________________________________________________-->
        <para>
-        要被用于表空间的目录。该目录应该为空并且必须由
+        要被用于表空间的目录。该目录必需存在（<command>CREATE TABLESPACE</command> 将不创建它），应该为空，并且必须由
         <productname>PostgreSQL</productname>系统用户拥有。该目录必须用一个绝对
         路径指定。
        </para>
@@ -259,30 +260,43 @@ ____________________________________________________________________________-->
 
 <!--==========================orignal english content==========================
   <para>
-   Create a tablespace <literal>dbspace</literal> at <literal>/data/dbs</literal>:
+   To create a tablespace <literal>dbspace</literal> at file system location
+   <literal>/data/dbs</literal>, first create the directory using operating
+   system facilities and set the correct ownership:
+<programlisting>
+mkdir /data/dbs
+chown postgres:postgres /data/dbs
+</programlisting>
+   Then issue the tablespace creation command inside
+   <productname>PostgreSQL</productname>:
 <programlisting>
 CREATE TABLESPACE dbspace LOCATION '/data/dbs';
 </programlisting>
   </para>
 ____________________________________________________________________________-->
   <para>
-   在<literal>/data/dbs</literal>创建一个表空间<literal>dbspace</literal>：
+   要在文件系统位置<literal>/data/dbs</literal>创建表空间<literal>dbspace</literal>，请首先使用操作系统工具创建目录并设置正确的所有权：
+<programlisting>
+mkdir /data/dbs
+chown postgres:postgres /data/dbs
+</programlisting>
+   然后在内部发出表空间创建命令
+   <productname>PostgreSQL</productname>:
 <programlisting>
 CREATE TABLESPACE dbspace LOCATION '/data/dbs';
 </programlisting>
   </para>
 
 <!--==========================orignal english content==========================
   <para>
-   Create a tablespace <literal>indexspace</literal> at <literal>/data/indexes</literal>
-   owned by user <literal>genevieve</literal>:
+   To create a tablespace owned by a different database user, use a command
+   like this:
 <programlisting>
 CREATE TABLESPACE indexspace OWNER genevieve LOCATION '/data/indexes';
 </programlisting></para>
 ____________________________________________________________________________-->
   <para>
-   在<literal>/data/indexes</literal>创建一个<literal>genevieve</literal>
-   用户拥有的表空间<literal>indexspace</literal>：
+   要创建由不同数据库用户拥有的表空间，可用类似这样的命令：
 <programlisting>
 CREATE TABLESPACE indexspace OWNER genevieve LOCATION '/data/indexes';
 </programlisting></para>