to access data from 2 different servers

I have oracle on 2 different servers data. I want to access the data to retrieve
through sql query and combine the retrieved data. How to recover data
on 2 servers.
Thank you

Try like this

SQL> select name from v$database;

NAME
---------
DBDEMO

SQL> create user testing identified by passwd;

User created.

SQL> grant connect,resource to testing;

Grant succeeded.

SQL> conn testing/passwd;
Connected.

SQL> create table test_tb (id number);

Table created.

SQL> insert into test_tb values(123);

1 row created.

SQL> / 

1 row created.

SQL> commit;

Commit complete.

SQL> select count(*) from test_tb;

  COUNT(*)
----------
         2

SQL> 

on dblink created machine:-

SQL> select name from v$database;

NAME
---------
DB2

SQL> create user nic identified by nic;

User created.

SQL> grant connect,resource, create database link to nic;

Grant succeeded.

SQL> conn nic/nic;
Connected.
SQL> create database link test_db_link connect to testing identified by passwd using '(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.1)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = dbdemo)))
  2  ';

Database link created.

SQL> select count(*) from test_tb@test_db_link;

  COUNT(*)
----------
         2

SQL>

Tags: Database

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    Hi friends,

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            BANNER
1     Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
2     PL/SQL Release 11.2.0.3.0 - Production
3     CORE     11.2.0.3.0     Production
4     TNS for Linux: Version 11.2.0.3.0 - Production
5     NLSRTL Version 11.2.0.3.0 - Production
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    Let me be more precise. It is a XML in an input file:
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<doc>
  <PERS_INFO>
    <lastname>John</lastname>
    <firstname>Doe</firstname>
    <social_security_no>1800325171545</social_security_no>
    <birthday>25/03/1980</birthday>
    <address>Principal, 15</address>
    <phoneno>0040722222222</phoneno>
    <acc>
      <transaction>200</transaction>
      <transaction>150</transaction>
      <transaction>-23</transaction>
    </acc>
    <acc>
      <transaction>450</transaction>
    </acc>
    <acc>
      <transaction>800</transaction>
      <transaction>320</transaction>
      <transaction>-125</transaction>
    </acc>
  </PERS_INFO>
  <PERS_INFO>
    <lastname>Smith</lastname>
    <firstname>Pop</firstname>
    <social_security_no>2851211173377</social_security_no>
    <birthday>11/12/1985</birthday>
    <address>FirstAvenue, 20</address>
    <phoneno>0040744444444</phoneno>
    <acc>
      <transaction>444</transaction>
      <transaction>550</transaction>
    </acc>
    <acc>
      <transaction>113</transaction>
      <transaction>-50</transaction>
      <transaction>89</transaction>
    </acc>
    <acc>
      <transaction>300</transaction>
    </acc>
  </PERS_INFO>
</doc>
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    2 Smith Pop / 2851211173377 / 11.12.1985 / FirstAvenue, 20 / 0040744444444

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    -account 2 - for this account, I need to create 1 new operations (using a stored procedure Pr_Create_New_Trans): DEPOSIT $ 450
    -count of 3 - for this account, I have to create 3 new operations (using a stored procedure Pr_Create_New_Trans): DEPOSIT $ 800, DEPOSIT $ 320, WITHDRAWAL $ 125

    -for Smith Pop I create 3 new account (using a stored procedure Pr_Add_New_Account):
    -account 1 - for this account, I need to create 2 new operations (using a stored procedure Pr_Create_New_Trans): DEPOSIT $ 444, DEPOSIT $ 550
    -account 2 - for this account, I have to create 3 new operations (using a stored procedure Pr_Create_New_Trans): DEPOSIT $ 113, WITHDRAW $50, DEPOSIT $ 89
    -count of 3 - for this account, I need to create 1 new operations (using a stored procedure Pr_Create_New_Trans): DEPOSIT $ 300


    Well, I think to do that by loading this XML into a table of staging pre - INS_STG1 - (the part of loading is not an issue at the moment) and by analyzing the XML code in order to get my (insert) in the second staging table INS_STG2 the information required to initiate these procedures.
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    DECLARE  

   TYPE ty_rec_1    IS RECORD (v_cust_firstname       VARCHAR2(32),
                               v_cust_lastname        VARCHAR2(32),
                               v_cust_persnumcode     VARCHAR2(32),
                               v_cust_birthday        VARCHAR2(32),
                               v_cust_address         VARCHAR2(32),
                               v_cust_phoneno         VARCHAR2(32));
   TYPE ty_cur_1       IS REF CURSOR RETURN ty_rec_1;
   TYPE ty_arr_rec_1   IS TABLE OF ty_rec_1 INDEX BY PLS_INTEGER;
   cur_1               ty_cur_1;
   arr_rec_1           ty_arr_rec_1;
   my_xml              xmltype;
   N_BULK_SIZE         NUMBER := 1000;
  
BEGIN 
  
  SELECT xml_column INTO my_xml FROM INS_STG1;
  
  OPEN cur_1 FOR
    SELECT extractvalue(column_value, '/PERS_INFO/firstname')          "v_cust_firstname",
           extractvalue(column_value, '/PERS_INFO/lastname')           "v_cust_lastname",
           extractvalue(column_value, '/PERS_INFO/social_security_no') "v_cust_persnumcode",
           extractvalue(column_value, '/PERS_INFO/birthday')           "v_cust_birthday",
           extractvalue(column_value, '/PERS_INFO/address')            "v_cust_address",
           extractvalue(column_value, '/PERS_INFO/phoneno')            "v_cust_phoneno"       
    FROM TABLE(XMLSequence(my_xml.extract('/doc/PERS_INFO'))) t;

    LOOP
       FETCH cur_1 BULK COLLECT INTO arr_rec_1 LIMIT N_BULK_SIZE;
       EXIT WHEN arr_rec_1.COUNT() = 0;
       FORALL n_idx1 IN 1..arr_rec_1.COUNT()
         INSERT INTO INS_STG2
           (cust_firstname, cust_lastname, cust_persnumcode, cust_birthday, cust_address, cust_phoneno)
          VALUES 
          (arr_rec_1(n_idx1).v_cust_firstname, arr_rec_1(n_idx1).v_cust_lastname, 
           arr_rec_1(n_idx1).v_cust_persnumcode, arr_rec_1(n_idx1).v_cust_birthday, 
           arr_rec_1(n_idx1).v_cust_address, arr_rec_1(n_idx1).v_cust_phoneno);
     END LOOP;
   CLOSE cur_1;  
  COMMIT;              

END;
    This procedure is based on the SQL query that I'm starting to fold with in order to understand how to get the information from XML using SQL (the XML is hardcoded)
    SELECT extractvalue(column_value, '/PERS_INFO/firstname')    "First Name",
       extractvalue(column_value, '/PERS_INFO/lastname')     "Last Name",
       extractvalue(column_value, '/PERS_INFO/social_security_no')  "Social Security No",
       extractvalue(column_value, '/PERS_INFO/birthday')     "Birth-day",
       extractvalue(column_value, '/PERS_INFO/address')      "Address",
       extractvalue(column_value, '/PERS_INFO/phoneno')      "Phone No"
  FROM TABLE(XMLSequence(
             XMLTYPE(
             '<?xml version="1.0" encoding="ISO-8859-1"?>
              <doc>
                <PERS_INFO>
                  <lastname>John</lastname>
                  <firstname>Doe</firstname>
                  <social_security_no>1800325171545</social_security_no>
                  <birthday>25/03/1980</birthday>
                  <address>Principal, 15</address>
                  <phoneno>0040722222222</phoneno>
                  <acc>
                    <transaction>200</transaction>
                    <transaction>150</transaction>
                    <transaction>-23</transaction>
                  </acc>
                  <acc>
                    <transaction>450</transaction>
                  </acc>
                  <acc>
                    <transaction>800</transaction>
                    <transaction>320</transaction>
                    <transaction>-125</transaction>
                  </acc>
                </PERS_INFO>
                <PERS_INFO>
                  <lastname>Smith</lastname>
                  <firstname>Pop</firstname>
                  <social_security_no>2851211173377</social_security_no>
                  <birthday>11/12/1985</birthday>
                  <address>FirstAvenue, 20</address>
                  <phoneno>0040744444444</phoneno>
                  <acc>
                    <transaction>444</transaction>
                    <transaction>550</transaction>
                  </acc>
                  <acc>
                    <transaction>113</transaction>
                    <transaction>-50</transaction>
                    <transaction>89</transaction>
                  </acc>
                  <acc>
                    <transaction>300</transaction>
                  </acc>
                </PERS_INFO>
              </doc>').extract('/doc/PERS_INFO'))) t;
    My problem is that this query will only at the first level (the level of the customer). I don't know how to get to the second and third level (transactions/account).
    Now, this query return:
    Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444
    and I want him back like this:
    Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  1   200
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  1   150
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  1  -23
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  2   450
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  3   800
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  3   320
Doe     John     1800325171545     25/03/1980     Principal, 15     0040722222222  3  -125 
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  1   444
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  1   550
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  2   113
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  2  -50
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  2   89
Pop     Smith     2851211173377     11/12/1985     FirstAvenue, 20     0040744444444  3   300
    What I do for this SQL query to get the result at the transaction level (as in the second table)? This XML can be improved as well. If another structure service for my purpose, please let me know.

    Thank you!

    Like [url http://docs.oracle.com/cd/E11882_01/server.112/e26088/functions061.htm#SQLRF06173] extractvalue is frowned upon in your version, you need to switch to another method, as shown in the documentation.

    Go further with that, here's a starter SQL which gives you the desired result

    WITH INS_STG1 AS
(SELECT XMLTYPE('
              
                
                  John
                  Doe
                  1800325171545
                  25/03/1980
                  
    Principal, 15
    
                  0040722222222
                  
                    200
                    150
                    -23
                  
                  
                    450
                  
                  
                    800
                    320
                    -125
                  
                    
                
                  Smith
                  Pop
                  2851211173377
                  11/12/1985
                  
    FirstAvenue, 20
    
                  0040744444444
                  
                    444
                    550
                  
                  
                    113
                    -50
                    89
                  
                  
                    300
                  
                    
                  ') xml_column FROM DUAL
)
-- The above simulates your table.  Only the below matters.
SELECT xt.First_Name, xt.birth_day, xt2.acc_rn, xt3.trans
  FROM INS_STG1,
       XMLTable('/doc/PERS_INFO'
                PASSING INS_STG1.xml_column
                COLUMNS
                First_Name   VARCHAR2(20) PATH 'firstname',
                Birth_day    VARCHAR2(10) PATH 'birthday',
                acc_xml      XMLType      PATH 'acc') xt,
       XMLTable('/acc'
                PASSING xt.acc_xml
                COLUMNS
                acc_rn       FOR ORDINALITY,
                tran_xml     XMLTYPE      PATH 'transaction') xt2,
       XMLTable('/transaction'
                PASSING xt2.tran_xml
                COLUMNS
                trans        NUMBER       PATH '.') xt3;

    product

    FIRST_NAME           BIRTH_DAY      ACC_RN      TRANS
-------------------- ---------- ---------- ----------
Doe                  25/03/1980          1        200
Doe                  25/03/1980          1        150
Doe                  25/03/1980          1        -23
Doe                  25/03/1980          2        450
Doe                  25/03/1980          3        800
Doe                  25/03/1980          3        320
Doe                  25/03/1980          3       -125
Pop                  11/12/1985          1        444
Pop                  11/12/1985          1        550
Pop                  11/12/1985          2        113
Pop                  11/12/1985          2        -50
Pop                  11/12/1985          2         89
Pop                  11/12/1985          3        300

    Now... There are probably a better way to XQuery to shoot that turned off, but I'll keep this better than me for someone of XQuery example.

    I'll also include is it possible that all this work could be done in a single SQL statement, as indicated by
    [url http://odieweblog.wordpress.com/2012/05/10/how-to-load-xml-data-into-multiple-tables/] How to: Load XML data in multiple tables

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