ORA-22992: cannot use&…

创建DBLINK后查询表数据返回错误ORA-22992,需要使用CHAR或RAW变量接收LOB对象   to receive the LOB objects into variables defined as CHAR or RAW.     参考文档：   Ora-22992 workaround (文档 ID 436707.1)

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In this Document Symptoms Changes Cause Solution Applies to: Oracle Database - Enterprise Edition - Version 10.2.0.1 to 11.2.0.4 [Release 10.2 to 11.2] Information in this document applies to any platform. Symptoms When trying to select from a remote table, getting  'ORA-22992: cannot use LOB locators selected from remote tables.' as following: 1. From the remote database: create 4000 user cris identified by cris; grant connect, resource to cris; conn cris/cris create table test(id number, obj clob); insert into test values(1,'sdfsdfsfd'); insert into test values(2, 'sdfsdfsfdvfgdfvgdfvdf'); commit; 2 From the local database: create user cris identified by cris; grant connect, resource, create database link to cris; conn cris/cris create database link torem using 'identification of the remote database in the tnsnames.ora'; set serveroutput on declare my_ad clob; BEGIN SELECT obj INTO my_ad FROM test@torem where id=1; dbms_output.put_line(my_ad); END; / * ERROR at line 1: ORA-22992: cannot use LOB locators selected from remote tables ORA-06512: at line 4 Changes Cause Trying to select LOB column from a table at a remote site using dblink. Solution The following link to documentation states that you can successfully select form lob objects through dblink All what you have to do is to receive the LOB objects into variables defined as CHAR or RAW. Oracle� Database Application Developer's Guide - Large Objects  10g Release 2 (10.2) Part Number B14249-01 Restrictions Removed inOracleDatabase 10g Release 2  http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14249/adlob_what.htm#CHDGGBCG http://download.oracle.com/docs/cd/B19306_01/appdev.102/b14249/adlob_data_interface.htm#CACIFCJF Here are the steps of how to do that: 1. Selecting a CLOB object through the dblink:  1.1 From the remote database: create user cris identified by cris; grant connect, resource to cris; conn cris/cris create table test(id number, obj clob); insert into test values(1,'sdfsdfsfd'); insert into test values(2, 'sdfsdfsfdvfgdfvgdfvdf'); commit; 1.2 From the local database: create user cris identified by cris; grant connect, resource, create database link to cris; conn cris/cris create database link torem using 'identification of the remote database in the tnsnames.ora'; set serveroutput on declare my_ad varchar(6000); BEGIN SELECT obj INTO my_ad FROM test@torem where id=1; dbms_output.put_line(my_ad); END; / 2. Selecting a BLOB object through the dblink:  2.1 From the remote database: create user cris identified by cris; grant connect, resource to cris; conn cris/cris create table test2(id number, obj blob); insert into test2 values(1,empty_blob()); insert into test2 values(2,empty_blob()); commit; 2.2 From the local database: create user cris identified by cris; grant connect, resource, create database link to cris; conn cris/cris create database link torem using 'identification of the remote database in the tnsnames.ora'; declare my_ad raw(50); BEGIN SELECT obj INTO my_ad FROM test2@torem where id=1; END; /

 

参考：http://www.linuxidc.com/Linux/2011-12/48581.htm

另外，我们可以借助全局临时表，先把数据复制到临时表，再从临时表转移到你的目的表。

create global temporary table ipop_topic_temp

as select * from ipop_topic@prod.us.oracle.com
where rownum=1

insert into ipop_topic_temp

select * from ipop_topic@prod.us.oracle.com
where application_id=1000

insert into ipop_topic

select * from ipop_topic_temp

commit