oerr 命令
oerr是一个简单而非常有用的命令，linux/unix的平台安装完Oracle就已经带有了。
window平台可以到网上下载
这个命令可以快速的查询一个根据oracle错误号的查到错误概要描述
比如
[oracle@dxzq10 ~]$ oerr ora 942
00942, 00000, “table or view does not exist”
// *Cause:
// *Action:
[oracle@dxzq10 ~]$ oerr ora 604
00604, 00000, “error occurred at recursive SQL level %s”
// *Cause: An error occurred while processing a recursive SQL statement
// (a statement applying to internal dictionary tables).
// *Action: If the situation described in the next error on the stack
// can be corrected, do so; otherwise contact Oracle Support.
[oracle@dxzq10 ~]$ oerr ora 19909
19909, 00000, “datafile %s belongs to an orphan incarnation”
// *Cause: Either the specified datafile was restored from a backup that was
// taken during a period of time that has already been discarded by
// a resetlogs operation, or Oracle cannot identify which database
// incarnation the file belongs to. The alert log contains more
// information.
// *Action: Restore a backup of this file that belongs to either the current
// or a prior incarnation of the database. If you are using RMAN
// to restore, RMAN will automatically select a correct backup.
来个TNS的错误
[oracle@dxzq10 ~]$ oerr tns 12541
12541, 00000, “TNS:no listener”
// *Cause: The connection request could not be completed because the listener
// is not running.
// *Action: Ensure that the supplied destination address matches one of
// the addresses used by the listener - compare the TNSNAMES.ORA entry with
// the appropriate LISTENER.ORA file (or TNSNAV.ORA if the connection is to
// go by way of an Interchange). Start the listener on the remote machine.
再来个rman的错误。
[oracle@dxzq10 ~]$ oerr rman 20242
20242, 1, “specification does not match any archive log in the recovery catalog”
// *Cause:
// *Action: check the archive log specifier
//
Exp的错误
[oracle@dxzq10 ~]$ oerr exp 00091
00091, 00000, “Exporting questionable statistics.”
// *Cause: Export was able export statistics, but the statistics may not be
// usuable. The statistics are questionable because one or more of
// the following happened during export: a row error occurred, client
// character set or NCHARSET does not match with the server, a query
// clause was specified on export, only certain partitions or
// subpartitions were exported, or a fatal error occurred while
// processing a table.
// *Action: To export non-questionable statistics, change the client character
// set or NCHARSET to match the server, export with no query clause,
// export complete tables. If desired, import parameters can be
// supplied so that only non-questionable statistics will be imported,
// and all questionable statistics will be recalculated.
还有这个
[oracle@dxzq10 ~]$ oerr NID 131
131, 1, “Control file is not current”
// *Cause: A non-current control file is currently mounted.
// *Action: Perform necessary actions to make the control file current and
// retry.
最方便的工具就在你的旁边，不要舍近求远的去找ora-err这样的网站了。
运行你的oerr命令把。