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>> Oracle DBA 常用SQL [<a href=http://www.jsp001.com/forum/showthread.php?goto=newpost&threadid=316>查看别人的评论</a>]<br>
<hr><p>由 macro 发布于: 2001-02-07 15:32</p><p><img src="images/icons/icon14.gif" alt="Thumbs up" border=0> </p><p>1、查看当前所有对象 <br><br>SQL> select * from tab; <br><br>2、建一个和a表结构一样的空表 <br><br>SQL> create table b as select * from a where 1=2; <br><br>SQL> create table b(b1,b2,b3) as select a1,a2,a3 from a where 1=2; <br><br>3、察看数据库的大小，和空间使用情况 <br><br>SQL> col tablespace format a20<br>SQL> select b.file_id 文件ID,<br> b.tablespace_name 表空间,<br> b.file_name 物理文件名,<br> b.bytes 总字节数,<br> (b.bytes-sum(nvl(a.bytes,0))) 已使用,<br> sum(nvl(a.bytes,0)) 剩余,<br> sum(nvl(a.bytes,0))/(b.bytes)*100 剩余百分比 <br> from dba_free_space a,dba_data_files b <br> where a.file_id=b.file_id <br> group by b.tablespace_name,b.file_name,b.file_id,b.bytes <br> order by b.tablespace_name<br> /<br> dba_free_space --表空间剩余空间状况<br> dba_data_files --数据文件空间占用情况<br><br><br>4、查看现有回滚段及其状态 <br><br>SQL> col segment format a30<br>SQL> SELECT SEGMENT_NAME,OWNER,TABLESPACE_NAME,SEGMENT_ID,FILE_ID,STATUS FROM DBA_ROLLBACK_SEGS; <br><br>5、查看数据文件放置的路径 <br><br>SQL> col file_name format a50<br>SQL> select tablespace_name,file_id,bytes/1024/1024,file_name from dba_data_files order by file_id; <br><br>6、显示当前连接用户 <br><br>SQL> show user <br><br>7、把SQL*Plus当计算器 <br><br>SQL> select 100*20 from dual; <br><br>8、连接字符串 <br><br>SQL> select 列1||列2 from 表1;<br>SQL> select concat(列1,列2) from 表1; <br><br>9、查询当前日期 <br><br>SQL> select to_char(sysdate,'yyyy-mm-dd,hh24:mi:ss') from dual; <br><br>10、用户间复制数据 <br><br>SQL> copy from user1 to user2 create table2 using select * from table1; <br><br>11、视图中不能使用order by，但可用group by代替来达到排序目的 <br><br>SQL> create view a as select b1,b2 from b group by b1,b2; <br><br>12、通过授权的方式来创建用户 <br><br>SQL> grant connect,resource to test identified by test; <br><br>SQL> conn test/test <br></p></td>
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