如何以良好的性能将大量数据从一个Oracle数据库复制到另一个数据库

Question

I need to copy about 50 millions of rows with joins among 3 4 tables from one Oracle db to another into a single table. This is a repeating process happening from time to time. I copy only active data (meaning that there's some outdated archived data that not needed any more). We havea special java service which does this procedure via JDBC which is too slow for our needs.

Answer 1

You can use the Transportable Modules

The fundamental functionality of a Transportable Module is to copy a group of related database objects from one database to another using the fastest possible mechanisms.

Answer 2

You can use DataPump utility available in Oracle 10g onwards. It gives you the capability to use direct path export. To know more, here is the link -

http://docs.oracle.com/cd/B19306_01/server.102/b14215/dp_export.htm