From: anton.txt@gmail.moc   
      
   Erland Sommarskog to Anton Shepelev:   
      
   > > I still fail, however, to understand why `first_lsn'   
   > > changes for each subsequent diff. backup.  It is   
   > > described as the "log sequence number of the first or   
   > > oldest log record in the backup set." Since the last   
   > > five diff. backups were generated with respect to the   
   > > same full backup, I expected them to have the same   
   > > first_lsn.  Why do they not?   
   >   
   > Because the backup itself is logged.   
      
   Thank you.  Now my system uses LSNs to avoid storing   
   redundant differential backups, and I like the result.  When   
   I look at a "batch" of my backup files (one full and   
   sequence of differential ones), instead of the typically   
   reguarly spaced files I see only backups taken when the   
   database was in flux, which is great.   
      
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