Oracle 无法使用从远程表中选择的 LOB 定位器

Question

As per below, I want to create a record into another database remotely which will work when I changed c1 to some string in insert query but when I use c1 object it will through error as per the title.

Please note: it's working fine on same remote without @, and using c1 object, tried other solution but no avail, can someone help me with a script for this dbms_lob. And its remote to another remote db insert

set define off;
Declare 
c1 clob default ' ';
begin 

dbms_lob.append(c1,chr(10));dbms_lob.append(c1,q'[DOCTYPE]');

Insert into SYSTEM_CONFIG@rtfqa (CONFIG_ID,NAME,VALUE_OLD,TYPE,SUB_TYPE,FROM_SYSTEM,TO_SYSTEM,VALUE) values ((select max(config_id)+1 from SYSTEM_CONFIG@rtfqa),'CONTRACT_HASHTAG_EN',null,'system','system',null,null,c1);
end; 

ERROR

Insert into SYSTEM_CONFIG@rtfqa (CONFIG_ID,NAME,VALUE_OLD,TYPE,SUB_TYPE,FROM_SYSTEM,TO_SYSTEM,VALUE) values ((select max(config_id)+1 from SYSTEM_CONFIG@rtfqa),'CONTRACT_HASHTAG_EN',null,'system','system',null,null,c1);
end;

>Error report -  
>ORA-06550: line 7, column 148:  
>PL/SQL: ORA-22992: cannot use LOB locators selected from remote tables  
>ORA-06550: line 7, column 1:  
>PL/SQL: SQL Statement ignored  
>06550. 00000 -  "line %s, column %s:\n%s"   
>*Cause:    Usually a PL/SQL compilation error.  
>*Action:

sql developer 18.2.0
DB = Oracle Database 12c Enterprise Edition Release 12.1.0.2.0 - 64bit Production

Answer 1

There are various restrictions when using distributed LOBs. One way around this is to operate on a local LOB global temporary table as follows:

• Create a global temporary table
• Load the row and manipulating the LOB in this GTT
• Use insert@remote as select from gtt to copy the data over

Which looks like:

create table t (
  c1 int, c2 clob
);

create global temporary table gtt as
  select * from t
  where  1 = 0;

declare
  v2 clob default ' ';
begin

  dbms_lob.append (
    v2,
    chr (10)
  );
  dbms_lob.append (
    v2,
    q'[DOCTYPE]'
  );

  insert into gtt (
    c1, c2 
  ) values (
    1, v2
  );

  insert into t@loopback 
    select * from gtt;

end;
/

select * from t;

C1   C2          
    1  
DOCTYPE  

Loopback is a database link pointing back to the same database to simulate a remote DB .

Answer 2

如果有人仍然遇到同样的问题，他应该通过 sys 用户运行 dblink 命令例如使用 system 作为 sysdba 连接到数据库。