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<p><FONT class=normalfont><B><font color=blue>Oracle常见错误代码的分析与解决一</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者:UP.Linux<br>来自:Linux知识宝库<br>联系方式:无名<br><br>在使用ORACLE的过程过,我们会经常遇到一些ORACLE产生的错误,对于初学者而言,这些错误可能有点模糊,而且可能一时不知怎么去处理产生的这些错误,本人就使用中出现比较频繁的错误代码一一做出分析,希望能够帮助你找到一个合理解决这些错误的方法,同时也希望你能够提出你的不同看法。毕竟作为一种交流的手段,个人意见难免过于偏颇,而且也必定存在着不足,出错之处在所难免。写这篇文章的目的就是想通过相互之间的交流共同促进,共同进步。<br>
<br>
ORA-01650:unable to extend rollback segment NAME by NUM intablespace NAME<br>
<br>
产生原因:上述ORACLE错误为回滚段表空间不足引起的,这也是ORACLE数据管理员最常见的ORACLE错误信息。当用户在做一个非常庞大的数据操作导致现有回滚段的不足,使可分配用的回滚段表空间已满,无法再进行分配,就会出现上述的错误。<br>
<br>
解决方式:使用“ALTER TABLESPACE tablespace_name ADD DATAFILE filename SIZE size_of_file”命令向指定的数据增加表空间,根据具体的情况可以增加一个或多个表空间。当然这与还与你主机上的裸盘设备有关,如果你主机的裸盘设备已经没有多余的使用空间,建议你不要轻意的增加回滚段表空间的大小,可使用下列的语句先查询一下剩余的tablespace空间有多少:<br>
<br>
Select user_name,sql_text from V$open_cursor where user_name=’’;<br>
<br>
如果多余的空间比较多,就可以适当追加一个大的回滚段给表空间使用,从而避免上述的错误。你也可以用以下语句来检测一下rollback segment的竞争状况:<br>
<br>
Select class,count from V$waitstat where calss in(‘system undo header’,’system undo block’,’undo header’,’undo block’);和<br>
<br>
Select sum(value) from V$sysstat where name in (‘db_block_gets’,’consistents gets’);<br>
<br>
如果任何一个class in count/sum(value)大于1%,就应该考虑增加rollback segment。<br>
<br>
相应的英文如下:<br>
<br>
Cause:Failed to allocate extent from the rollback segment in tablespace<br>
<br>
Action:Use the ALTER TABLESPACE ADD DATAFILE statement to add one or more files to the specified tablespace.<br>
<br>
ORA-01652:unable to extend temp segment by num in tablespace name<br>
<br>
产生原因:ORACLE临时段表空间不足,因为ORACLE总是尽量分配连续空间,一但没有足够的可分配空间或者分配不连续就会出现上述的现象。<br>
<br>
解决方法:我们知道由于ORACLE将表空间作为逻辑结构-单元,而表空间的物理结构是数据文件,数据文件在磁盘上物理地创建,表空间的所有对象也存在于磁盘上,为了给表空间增加空间,就必须增加数据文件。先查看一下指定表空间的可用空间,使用视图SYS.DBA_FREE_SPACE,视图中每条记录代表可用空间的碎片大小:<br>
<br>
SQL>Select file_id,block_id,blocks,bytes from sys.dba_free_space where tablespace_name=’’;<br>
<br>
返回的信息可初步确定可用空间的最大块,看一下它是否小于错误信息中提到的尺寸,再查看一下缺省的表空间参数:<br>
<br>
SQL>SELECT INITIAL_EXTENT,NEXT_EXTENT,MIN_EXTENTS,PCT_INCREASE FROM SYS.DBA_TABLESPACES WHERE TABLESPACE_NAME=name;<br>
<br>
通过下面的SQL命令修改临时段表空间的缺省存储值:<br>
<br>
SQL>ALTER TABLESPACE name DEFAULT STORAGE (INITIAL XXX NEXT YYY);<br>
[返回列表]<br>
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