oerr是oracle在unix上的查找ora错误的小工具，极其方便。
命令格式为：
oerr ora 错误编号
例如要查看ora-01632的描述：

[oracle@shtdtest oracle]$ oerr ora 01632
01632, 00000, "max # extents (%s) reached in index %s.%s"
// *Cause:  An index tried to extend past maxextents
// *Action: If maxextents is less than the system max, raise it. Otherwise,
//          you must recreate with larger initial, next or pctincrease params.
[oracle@shtdtest oracle]$