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Oracle -- Database LINK -- on two different servers

Posted on 2011-02-21
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Last Modified: 2013-12-19
Doing the below works when i have two databases (test & dev) on the same machine (server1)

How can I do the same logic, but on different machines ?

Example = dev is on server1 and test is on server2

create public database link
  dev123     -- user defined, can be anything
connect to
  hr            -- DEV's user
identified by
  .....            -- DEV's password
using 'dev'; -- DEV's SID

create public database link
  test123     -- user defined, can be anything
connect to
  hr            -- test's user
identified by
  .....            -- test's password
using 'test'; -- test's SID

insert into accounting_structure_tab@dev123
select *
from accounting_structure_tab@test123;
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Question by:finance_teacher
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8 Comments
 
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Accepted Solution

by:
sdstuber earned 2000 total points
ID: 34945497
you do it the exact same way


the only "trick" is you need to make sure your tnsnames.ora (or ldap if using that) is configured on DEV so your DEV db can find your TEST db on the other server.
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LVL 74

Expert Comment

by:sdstuber
ID: 34945510
also, you don't need (or want) 2 database links.


you only want one link, from the target system linking to the source system.

In your case, you want one link on dev that connects to test.
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Expert Comment

by:Bawer
ID: 34945532
try this format

Select * from [ServerName].[DatabaseName].[Scheme].[TableName]
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Expert Comment

by:sdstuber
ID: 34945560
Bawer,

that's sqlserver syntax,  doesn't apply here
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Expert Comment

by:sventhan
ID: 34945702
If you do not want to use DB link, you could use SQL Plus copy command. Its over the wire and does not require a DB link.

http://download.oracle.com/docs/cd/B10501_01/server.920/a90842/apb.htm
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Expert Comment

by:sdstuber
ID: 34945719
dblink is more efficient, it allows direct insert from source to target

COPY will copy all of the data locally to you client  from the source then do inserts from your client to the target

if the table is small you might not notice the lag but if it's large, dblink is definitely the way to go
Note, you can't copy  LONG type across the dblink but COPY will allow it.  Hopefully you aren't using LONG types though, they were deprecated years ago
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Expert Comment

by:sventhan
ID: 34945734

COPY FROM username/your_password@db-
append accounting_structure_tab-
USING select * -
from accounting_structure_tab
0
 
LVL 3

Expert Comment

by:gopisera
ID: 34948471
Here is the syntax for your question.

create database link name connect to <username> identified by <password of user> using 'tnsentry';
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