Process Structure :
Process Structure : A Data Pump job comprises several processes. These processes are described in the order of their creation.
- Data File Copying (transportable tablespaces)
- Direct Path load and unload
- External Tables
- Conventional Path
- Command and control queue: All processes (except clients) subscribe to this queue. All API commands, work requests and responses, file requests, and log messages are processed on this queue.
- Status queue: Only shadow processes subscribe to read from this queue. It is used to receive work-in-progress and error messages queued by the MCP. The MCP is the only writer to this queue.