I have two questions: 1. In Postgresql, what is the name of the exact DATAFILE under the DATA DIRECTORY ? 2. We want to prepare a backup machine (for disaster management)by passing the pg_xlog diectory.First time we have made a base backup & restore the backup server by this backup.but when we want to recover from pg_xlog backup.Firsttime it is working,after that not.Can we recover by passing pg_xlog? Please help us in resolving this problem whereby we do not have to send the full DATA Directory.