将大量数据从Oracle DB导出到Oracle DB的最佳方法

Question

That's my first post in stackoverflow, and i've to say that i really like that website !

For a project i need to export then re-import some huge Oracle tables from one DB to another (around 100 million lines and 30 rows).

My idea is to export the table in a flat file and then reimport into another empty table considering that the schema already exists.

I'm using PL/SQL Developer and/or SQL*Plus to make my operations.

I've tested SQL*Loader which seems to do a good job but it's really slow in my opinion : about 30 seconds to make an import of a CSV file with 1 million lines/30 rows.

Which solution could you bring? Is SQL*Loader is the best tool? Some better tools already exists? Is CSV the better format talking about size and processing time?

Thanks a lot in advance.

Answer 1

Use Oracle DataPump aka expdp and impdp Overview of Oracle Data Pump See Examples of Using Data Pump Export and Examples of Using Data Pump Import

There really is no need to program this on your own, there is no way that you can outperform expdp/impdp. Don't forget there is also an impdp option to use a network_link. In that case, you just skip the dmp file and import directly into the target database. This can be done using impdp from the commandline but also using dbms_datapump using pl/sql. See PL/SQL Packages and Types Reference for docu.

Answer 2

You can use one of the following option:

1. SQL Loader (which you already might be trying out).
2. Traditional data export and Import (exp / imp commands).
3. Oracle data pump (expdp /impdp).

Also if you need to do this regularly then you can schedule this using oracle scheduler or shell script.