在Oracle分布式数据库中处理LOB的最佳方法

如果创建Oracle dblink，则无法直接访问目标表中的LOB列.

If you create an Oracle dblink you cannot directly access LOB columns in the target tables.

例如，您使用以下命令创建一个dblink:

For instance, you create a dblink with:

create database link TEST_LINK 
  connect to TARGETUSER IDENTIFIED BY password using 'DATABASESID';

之后，您可以执行以下操作:

After this you can do stuff like:

select column_a, column_b 
from data_user.sample_table@TEST_LINK

除非该列是LOB，否则您将收到错误:

Except if the column is a LOB, then you get the error:

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

这是已记录的限制.

同一页上建议您将值提取到本地表中，但这很杂乱:

The same page suggests you fetch the values into a local table, but that is... kind of messy:

CREATE TABLE tmp_hello 
AS SELECT column_a 
from data_user.sample_table@TEST_LINK

还有其他想法吗?