4/7/08

export,import data in oracle with exp/imp command

One of database box hang today. It doesn't let me ssh to see what happen, so I just shut it down and try to reboot again. But during boot process, I got "Kernel panic: VFS: Unable to mount root fs on...". err.. look like the disk is gone.
Anyway, after few time of cold boot it give me a chance to backup my data:). I don't need all data in database[too many outdate data], so I decide to move some importance table to another database. Oracle has exp and imp utility to do this job. To export table test123 to file test123.dmp type follwing command.

[oracle@Oracle-1 oracle]$ exp username/password TABLES=test123 FILE=test123.dmp

Export: Release 8.1.7.0.1 - Production on Mon Apr 7 13:22:01 2008

(c) Copyright 2000 Oracle Corporation. All rights reserved.


Connected to: Oracle8i Enterprise Edition Release 8.1.7.0.1 - Production
With the Partitioning option
JServer Release 8.1.7.0.1 - Production
Export done in US7ASCII character set and US7ASCII NCHAR character set

About to export specified tables via Conventional Path ...
. . exporting table TEST123 1 rows exported
Export terminated successfully without warnings.
[oracle@Oracle-1 oracle]$

then ftp dump file[test123.dmp] to new database[make sure that using binary on transfer]. To import dump file into new database see below.
[oracle@ora10g ~]$ imp username/password FILE=test123.dmp fromuser=username touser=username

Import: Release 10.1.0.3.0 - Production on Mon Apr 7 13:29:40 2008

Copyright (c) 1982, 2004, Oracle. All rights reserved.


Connected to: Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - Production
With the Partitioning, OLAP and Data Mining options

Export file created by EXPORT:V08.01.07 via conventional path
import done in WE8ISO8859P1 character set and AL16UTF16 NCHAR character set
export client uses US7ASCII character set (possible charset conversion)
export server uses US7ASCII NCHAR character set (possible ncharset conversion)
. . importing table "TEST123" 1 rows imported
Import terminated successfully without warnings.
[oracle@ora10g ~]$


note: when move data DOWN a version(s). you may need to export using that lower versions EXP tool and IMP using that lower versions tool.[more detail]

1 comments:

hari said...

hie its very useful to me. when i check in my user scott thr is ob=nly one table emp. i exp emp table again i imp same table then in scott user total 2 tables i have to see but i find out only one.plz execute with user names