Question

I m accessing remote database through DBLINK, but when trying to fire select query to fetch image stored in BLOB datatype it gives me following error:

ORA-22992: cannot use LOB locators selected from remote tables

Thanks in Advance.

Answer 1

You didn’t provide the statement you are trying to execute, but I guess you are trying to do something which simply isn’t possible in Oracle 10g.

The docs at http://docs.oracle.com/cd/B19306_01/server.102/b14200/sql_elements001.htm#sthref161 state:

Oracle Database has limited support for remote LOBs. Remote LOBs are
supported in three ways.

1. Create table as select or insert as select.

2. Functions on remote LOBs returning scalars. SQL and PL/SQL functions having a LOB parameter and returning a scalar datatype are
   supported. Other SQL functions and DBMS_LOB APIs are not supported for
   use with remote LOB columns.

3. Data Interface for remote LOBs. You can insert a character or binary buffer into a remote CLOB or BLOB, and select a remote CLOB or
   BLOB into a character or binary buffer.

These are the only supported syntax involving LOBs in remote tables.
No other usage is supported.

See the link for extended examples.