Unable to access table even after creating Database link

Hi
I have created a data base link.It was created properly.
The Syantax that I have used is follows:
create database link X_link connect to User1 identified by User1 using 'Other_Database'
And on running the query:
select count(*) from table1@X_link
I am getting the error as follows:
TNS could not resolve the connect identifier specified... TNS: could not resolve the connect identifier specified.
Please tell me where is the problem?
Thanks in Advance

Your database link does not work because the entry you used does not exist in the tnsnames.ora in the database $ORACLE_HOME.
Login to the database server, set the environment, and try to tnsping the entry you used for the database link, then fix the tnsnames.ora file (probably in $ORACLE_HOME/network/admin)
You can test a database link using :-
select sysdate from dual@link;

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Thanks for Everyone,
I was struggle with this almost 10 days....
I created Database link from Oracle to SQL Server
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Here i am giving my servers configuration and proceedure how i created the db link...@
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Host : abcdbt
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I'm trying to execute the following statement within sqlplus
create database link alpha connect to scott identified by tiger! using 'db_alpha'
note that the password for the account has an exclamation point in it. the command fails. I've tried placing the password in quotes (') and double-quotes ("). The double-quotes work, but then the link fails to function properly.
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Thanks in advance,
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for some weird reason, I can't post the reply I want. every time I try, the forum hangs and doesn't save the message. give me a sec...
I have put the password within double quotes... so I'm starting to think the problem is something else. I've been reading other posts regarding creating database links and I've obtained limited results. Here's what I've done, and the results I'm getting.
(names changed to protect the innocent)
My oracle database is on SYSA. I'm on SYSB. I set my TWO_TASK=SYSA and just use sqlplus to connect as user1.
I want to run a command on user2's tables. Normally I would just grant read access to user1 on user2's tables and use a command like
nert spaces to get this to save (weird forum bug here, I can't delete the text to the left)
SQL> sel{color:black}{color}ect * fr{color:black}{color}om u{color:black}{color}s{color:black}{color}e{color:black}{color}r{color:black}{color}2{color:black}{color}.{color:black}{color}m{color:black}{color}y{color:black}{color}_{color:black}{color}t{color:black}{color}a{color:black}{color}b{color:black}{color}l{color:black}{color}e{color:black}{color};
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Back to creating the database link, I thought my issue was the special character in the password because if I remove the exclamation point everyting works (except that the password is invalid). Below is what it looks like when I do this...
Attempt #1:
SQL> create database link BLAH connect to user2 identified by "tiger" using 'BLAH';
Database link created
SQL> sel{color:black}{color}ect * fr{color:black}{color}om my{color:black}{color}_{color:black}{color}table{color:black}{color}@{color:black}{color}BLAH;
sel{color:black}{color}ect * fr{color:black}{color}om my{color:black}{color}_{color:black}{color}ta{color:black}{color}ble{color:black}{color}@{color:black}{color}BLAH
ERROR at line 1:
ORA-01017: invalid username/password; logon denied
ORA-02063: preceding line from BLAH
So that looks like it's just a password issue. If I put in the correct password... the error changes to this...
Attempt #2:
SQL> create database link BLAH connect to user2 identified by "tiger!" using 'BLAH';
Database link created
SQL> sel{color:black}{color}ect {color:black}{color}* fr{color:black}{color}om my{color:black}{color}_{color:black}{color}table{color:black}{color}@BLAH;
sel{color:black}{color}ect * fr{color:black}{color}om my{color:black}{color}_ta{color:black}{color}ble{color:black}{color}@BLAH
ERROR at line 1:
ORA-02085: database link BLAH.AAA.BB.CCC.DDD connects to
DEVDB.AAA.BB.CCC.DDD
To me, that doesn't make sense. If the link isn't working... how did it get the "invalid username/password" in Attempt #1?
Anyway, in perusing other forum posts, one post said to put in the full text from the tnsnames.ora file instead of the alias. So I do a little cut/paste and try this...
Attempt #3:
SQL> create database link BLAH connect to user2 identified by "tiger!" using
2 '(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = server001.aaa.bb.ccc.ddd)(PORT = 9999)))
3 (CONNECT_DATA = (SERVICE_NAME = devdb)))';
Database link created.
SQL> sel{color:black}{color}ect {color:black}{color}* fro{color:black}{color}m my{color:black}{color}_{color:black}{color}tab{color:black}{color}le{color:black}{color}@BLAH;
sel{color:black}{color}ect {color:black}{color}* fr{color:black}{color}om {color:black}{color}my_{color:black}{color}tab{color:black}{color}le@B{color:black}{color}LAH
ERROR at line 1:
ORA-02085: database link BLAH.AAA.BB.CCC.DDD connects to
DEVDB.AAA.BB.CCC.DDD
Any ideas on what I'm doing wrong?
Darren

Steps to create database link

i got these info from my teacher to create database link
1.     Establish the network connection.
2.     Shutdown the database. (SQL>shutdown immediate ;)
3.     Open and modify the pfile and set GLOBAL_NAME = FALSE.
4.     Create spfile from pfile. (SQL>create spfile from pfile;)
5.     Startup database. (SQL> startup;)
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ASIF.com =
(DESCRIPTION =
(ADDRESS_LIST =
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(CONNECT_DATA =
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(SERVICE_NAME = ORCL)
7.     Crate database link .
SQL>create public/private database link abc
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i got a file in F:\oracle\admin\fahmi\pfile named init.ora.31620060327
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so watching the sample i add this line in init.ora.31620060327
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sir,
i have created a database link using the following statement.
create database link orcl.vishnu.com;
but when i tried to insert the data it i get
ora-02019 connect description for remote database not found..
on both the database i have the same logins with the same passwords.. i have even created a serice name called orcl.vishnu.com. and it works well when connect manually.
when i use the following statement it works..
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http://www.psoug.org/reference/db_link.html
http://www.stanford.edu/dept/itss/docs/oracle/10g/server.101/b10759/statements_5005.htm
Wish you Happy New Year 2010...!!
- Pavan Kumar N
Oracle 9i/10g - OCP
http://oracleinternals.blogspot.com/

Create database link

hi guys.
I need help to create database link with this scenario
i want to create database link between database A ,database B i want to access something inside B i have problems with command and i need help to create database link .
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Regards.

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Unable to access table even after creating Database link

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