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Re: Make a backup only if necessary

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From	Anton Shepelev <anton.txt@gmail.moc>
Newsgroups	comp.databases.ms-sqlserver
Subject	Re: Make a backup only if necessary
Date	Wed, 29 May 2024 00:52:33 +0300
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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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Make a backup only if necessary Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-05-27 12:59 +0300
  Re: Make a backup only if necessary Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-05-27 13:53 +0300
  Re: Make a backup only if necessary Erland Sommarskog <esquel@sommarskog.se> - 2024-05-27 22:43 +0200
    Re: Make a backup only if necessary Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-05-28 12:41 +0300
      Re: Make a backup only if necessary Erland Sommarskog <esquel@sommarskog.se> - 2024-05-28 20:11 +0200
        Re: Make a backup only if necessary Anton Shepelev <anton.txt@gmail.moc> - 2024-05-29 00:52 +0300
          Re: Make a backup only if necessary Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-05-31 13:53 +0300
            Re: Make a backup only if necessary Erland Sommarskog <esquel@sommarskog.se> - 2024-06-01 11:34 +0200
              Re: Make a backup only if necessary Anton Shepelev <anton.txt@gmail.moc> - 2024-06-02 14:43 +0300
                Re: Make a backup only if necessary Erland Sommarskog <esquel@sommarskog.se> - 2024-06-04 20:22 +0200
                Re: Make a backup only if necessary Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-06-05 17:15 +0300
                Re: Make a backup only if necessary Anton Shepelev <anton.txt@g{oogle}mail.com> - 2024-06-05 19:37 +0300

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