APLoader

APLoader is a Ruby-based front-end to the Postgresql COPY command that offers users a range of functionalities. The tool boasts minimal requirements, an intuitive interface, and excellent performance. The application is easy to install and it is a PostgreSQL Community project that is part of the pgFoundry.

One of the key features of APLoader is its fault tolerance, which allows users to avoid unexpected errors and ensures that uploads are completed without any data loss. Users can also take advantage of a progress meter that shows how far along an upload is and failed batch logs that detail any issues that may arise during the process.

In addition, APLoader offers a programmable API that allows for customized uploads based on specific needs. Users can install APLoader by suiting to root and running "ruby setup.rb" to install in an alternate location. Alternatively, they can use the command "ruby setup.rb all --prefix=/some/other/location."

Overall, APLoader is a highly capable tool that offers an efficient way of uploading data onto PostgreSQL databases. Its fault tolerance, progress meter, and programmable API make it a highly desirable tool for developers and database administrators.