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Oracle direct export to remote database tips

Oracle Database Tips by Donald BurlesonAugust 2, 2013


Question:
How do you export a table directly to a remote database?  I don't want to use expdp to create an intermediate .dmp file to transfer to the remote database and I understand that expdp can export and import using a db link.  If so, how do you invoke a direct export to another database?

Answer: First, note that expdp/impsp is only one of many options to migrate tables between databases.  In expdp and impdp you can use the network_link parameter provided that you have defined a database link:

 

create database link
   my_link
connect to
   fred
identified by
   flintstone
using
  testdev;

 

One the network_link is create you have two ways to directly export/import database between systems:

 

1:  Expdp from the source database to the destination (remote) database.  Note that using expdp with the remote link requires that you specify a dmp file:

 

expdp fred/flintstone@testdev tables=customer network_link=my_link directory=TEST_DIR dumpfile=/tmp/cust.dmp logfile=mylog.log

 

2: Use impdp with the network_link parameter from the destination database.

 

impdp fred/flintstone@testdev tables=customer network_link=my_link directory=tempdir logfile=importcust.log remap_schema=fred:test

 

Both the local and remote users require the exp_full_database role granted to the user ID.   Also note the "parallel" parameter which speeds-up the export/import operations.

 

Note that a traditional export to a dmp file, followed by an FTP may be a faster solution if you network connection has limited bandwidth.  Also, using CTAS (create table as select) over a database link is faster than expdp, but it does not copy over the index and constraint definitions.

   
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