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Question

Hai
i have a doubt regarding the import behaviour.please clear it.i have pasted it below.
=========See behaviour of IMPDP while using NETWORK_LINK parameter.
Say you have DB1 on Host1 and DB2 on Host2. Now, you want to import Table1 from DB1 to DB2.
Table1 is owned by User1 at DB1 and you want it to be owned by USER2 at DB2.
1. Create database link at DB2 which connects to DB1 and uses USER1 for connecting. TNSNAME for connection from Host2 to Host1 is DB1.WORLD.COM:
create database link mylink connect tu user1 identified by 'user1_password' using 'DB1.WORLD.COM';
Here DB1.WORLD.COM is tns entry in tnsnames.ora at HOST2.
2. Execute IMPDP:
impdp user2/user2_password TABLES = TABLE1 DIRECTORY=MYDIR NETWORK_LINK=MYLINK;
NETWORK_LINK is the name of database link in the database where IMPDP connects to.
So, impdp connect to DB2, search for Database link named 'MYLINK' and connects to DB1 and selects Table1 from DB1(Oracle connects to DB1 using connection properties of DBLINK - in our case, username is USER1, password is USER1_PASSWORD, TNSNAME is DB1.WORLD.COM).
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i read the following in the forum.here i have a doubt that here in import what does directory denotes.does it denote the location where the export dumpfile will bw placed and will the user who import the data will be having access on the directory.please say me.is it necessary to mention this directory while importing.
actully my doubt is that the source directory will be in one server where the dumpfile will be placed and the server from where we runthe import will be different.so how does the import utility in some other server recognize the dumpfile existing in the directory in some other server for performing the import operation.please clear my doubt

Answer 1

i have 2 servers A and B.A is the source server having db1 and B is the server having DB2.the schema existing in server A is RAJ.the user performs the export of the employees table on the source server A like this
create directory a1 as '/u01/app';
grant read,write on directory a1 to raj
expdp raj/raj schemas=raj tables=employees dumpfile=exp1.dmp directory=a1
this command peroforms the export and creates the dumpfile and places it in the a1 directory.
the user created a link as sid in tnsnames.ora of source instance is db1
create database link mks connect to raj identified by raj using db1;
so this "create database link" command we have to implement in the source where i have performed the export
now i have to import the data in the db2 database in the target server.i have to give in the target database like this
impdp raj/raj tables=employees directory=a1 network_link=mks
so when i implement this in target server the data will be imprted in the target server through the link
here my doubt is that whether we have to implement the database link creation in the source server?
and is it neccessary that the import query directory name should match the directory existing in the source server that is 'a1'