Full or Diff backup impact on Log size?

I have a question regarding FUll and differential backup.

We we take full or diff back up, does it create lot of logs ie. Does full or diff backup has any impact on log size?

Thanks

No, not in my experience.|||The backup itself will not add much to the log, but it will hold up log truncation for the duration of the backup so that if there is a lot of other activity being logged by other users during the backujp, the log can become increasingly full. Once the backup is done, the log should be able to truncate as usual (for SIMPLE recovery mode.)|||Thanks for the replies.
So taking full or diff backup does not create additional logs?. It will be just the logs of incoming transactions (not any additional logs because of full or diff backup)?

Thanks
|||That's correct.

Full and Diff Backups

If I run a full Bkp when the Log file is 10 Gig, and the backup runs for 1 hour while another 5 Gig is added in transactions to the log file, The Backup should complete leaving only the new 5 Gig of transactions while the previous 10 Gig were applied to t
he backup. Basically backing up everything upto and including the Backup statement.
Does the same action take place on the transaction log during a differential backup? Does a differential backup include every transaction on the log file upto and including the backup statement?
>> Basically backing up everything upto and including the Backup statement.
Not exactly. From Inside SQL Server 2000:
'To maintain consistency for either a full or a differential backup, SQL
Server records the current log sequence number (LSN) at the time the backup
starts and then again at the time the backup ends. This allows the backup to
also capture the relevant parts of the log. The relevant part starts with
the oldest open transaction at the time of the first recorded LSN and ends
with the second recorded LSN.'
Thus, the 5 Gig of 'new' trxs will also be present in the log, but will only
be applied upon restore if they were committed at the time the backup ended,
assuming you restore with the RECOVERY option.
Peter Yeoh
http://www.yohz.com
Need smaller SQL2K backups? Try MiniSQLBackup
"Brian" <Brian@.discussions.microsoft.com> wrote in message
news:2A52A0B3-23D5-4771-8170-3BE8CFF8330C@.microsoft.com...
> If I run a full Bkp when the Log file is 10 Gig, and the backup runs for 1
hour while another 5 Gig is added in transactions to the log file, The
Backup should complete leaving only the new 5 Gig of transactions while the
previous 10 Gig were applied to the backup. Basically backing up everything
upto and including the Backup statement.
> Does the same action take place on the transaction log during a
differential backup? Does a differential backup include every transaction on
the log file upto and including the backup statement?
>

Full and Diff Backups

If I run a full Bkp when the Log file is 10 Gig, and the backup runs for 1 h
our while another 5 Gig is added in transactions to the log file, The Backup
should complete leaving only the new 5 Gig of transactions while the previo
us 10 Gig were applied to t
he backup. Basically backing up everything upto and including the Backup sta
tement.
Does the same action take place on the transaction log during a differential
backup? Does a differential backup include every transaction on the log fil
e upto and including the backup statement?>> Basically backing up everything upto and including the Backup statement.
Not exactly. From Inside SQL Server 2000:
'To maintain consistency for either a full or a differential backup, SQL
Server records the current log sequence number (LSN) at the time the backup
starts and then again at the time the backup ends. This allows the backup to
also capture the relevant parts of the log. The relevant part starts with
the oldest open transaction at the time of the first recorded LSN and ends
with the second recorded LSN.'
Thus, the 5 Gig of 'new' trxs will also be present in the log, but will only
be applied upon restore if they were committed at the time the backup ended,
assuming you restore with the RECOVERY option.
Peter Yeoh
http://www.yohz.com
Need smaller SQL2K backups? Try MiniSQLBackup
"Brian" <Brian@.discussions.microsoft.com> wrote in message
news:2A52A0B3-23D5-4771-8170-3BE8CFF8330C@.microsoft.com...
> If I run a full Bkp when the Log file is 10 Gig, and the backup runs for 1
hour while another 5 Gig is added in transactions to the log file, The
Backup should complete leaving only the new 5 Gig of transactions while the
previous 10 Gig were applied to the backup. Basically backing up everything
upto and including the Backup statement.
> Does the same action take place on the transaction log during a
differential backup? Does a differential backup include every transaction on
the log file upto and including the backup statement?
>

full and diff backup - sql2005

hello...
I've got problem with backups on sql2005
script make backup at saturday with full backup and at monday script
runs diff backup. On one of few sqlservers2005 diff backups doesn't
run because because error: "a current database backup does not
exist" . But I know full backup was executed corectly on saturday.
In backup file , that is used for diff backup exists record for
saturday's full backup. But server can't recognize full backup for
db.
When I run full backup again, it run sucessfully and diff backup
too.
This error is only on one server (named instance), other servers are
ok.
Any hints for this mystery ?
Thanks for any help.Well, try doing a manual full and see if it resolves.
I'm not sure if the backup is looking at logs in msdb, or if it writes a
flag, but a manual full will deal with both. In short, I wouldn't put too
much energy into it, unless the simple solution doesn't work ...
<oto.pakozdy@.gmail.com> wrote in message
news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.|||On 27. Nov, 16:57 h., "Jay" <s...@.nospam.org> wrote:
> Well, try doing a manual full and see if it resolves.
> I'm not sure if the backup is looking at logs in msdb, or if it writes a
> flag, but a manual full will deal with both. In short, I wouldn't put too
> much energy into it, unless the simple solution doesn't work ...
> <oto.pako...@.gmail.com> wrote in message
> news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
>
> > hello...
> > I've got problem with backups on sql2005
> > script make backup at saturday with full backup and at monday script
> > runs diff backup. On one of few sqlservers2005 diff backups doesn't
> > run because because error: "a current database backup does not
> > exist" . But I know full backup was executed corectly on saturday.
> > In backup file , that is used for diff backup exists record for
> > saturday's full backup. But server can't recognize full backup for
> > db.
> > When I run full backup again, it run sucessfully and diff backup
> > too.
> > This error is only on one server (named instance), other servers are
> > ok.
> > Any hints for this mystery ?
> > Thanks for any help.- Skry=BB citovan=FD text -
> - Zobrazi=BB citovan=FD text -
Now I altered db_backupoperator role for MSDB by user running backup
script. soi I will see if it help.|||Perhaps you do some type of snapshot backup on the machine and this interferes in some way with the
diff backups? Consider disabling the SQL Server VSS writer service in that case. Just a thought...
--
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://sqlblog.com/blogs/tibor_karaszi
<oto.pakozdy@.gmail.com> wrote in message
news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.|||I usually run this to get the history of backups for a specific database.
Try it and see what information it returns. Chage database name and pay
atention to the type column.
select backup_set_id, bs.media_set_id, database_creation_date,
backup_start_date, backup_finish_date,
type, database_name, physical_device_name
from backupset bs join backupmediafamily bmf
on bs.media_set_id = bmf.media_set_id
where database_name = 'your_db'
-- and type <> 'L'
order by backup_start_date desc
Hope this helps,
Ben Nevarez
Senior Database Administrator
AIG SunAmerica
"oto.pakozdy@.gmail.com" wrote:
> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.
>|||I found solution on google
Problem is MSSQL SP2 changed startup state SQL Server VSS Writer from
manual to started . So when NTbackup run backup it breaks backup
chain because vss make own db backups.
So when I turn off SQL VSS Writer everyting works fine.
ntbackup backup files without backuping db and sql backup chain
full,diff is not break.
Thank for your hints.|||Hello, I think i meet the same problem. but you said you have find the
resolution on google. Could you please give me the link that describe the
problem?
Thanks,
Gil
"oto.pakozdy@.gmail.com" wrote:
> I found solution on google
> Problem is MSSQL SP2 changed startup state SQL Server VSS Writer from
> manual to started . So when NTbackup run backup it breaks backup
> chain because vss make own db backups.
> So when I turn off SQL VSS Writer everyting works fine.
> ntbackup backup files without backuping db and sql backup chain
> full,diff is not break.
>
> Thank for your hints.
>

full and diff backup - sql2005

hello...
I've got problem with backups on sql2005
script make backup at saturday with full backup and at monday script
runs diff backup. On one of few sqlservers2005 diff backups doesn't
run because because error: "a current database backup does not
exist" . But I know full backup was executed corectly on saturday.
In backup file , that is used for diff backup exists record for
saturday's full backup. But server can't recognize full backup for
db.
When I run full backup again, it run sucessfully and diff backup
too.
This error is only on one server (named instance), other servers are
ok.
Any hints for this mystery ?
Thanks for any help.Well, try doing a manual full and see if it resolves.
I'm not sure if the backup is looking at logs in msdb, or if it writes a
flag, but a manual full will deal with both. In short, I wouldn't put too
much energy into it, unless the simple solution doesn't work ...
<oto.pakozdy@.gmail.com> wrote in message
news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.|||On 27. Nov, 16:57 h., "Jay" <s...@.nospam.org> wrote:
> Well, try doing a manual full and see if it resolves.
> I'm not sure if the backup is looking at logs in msdb, or if it writes a
> flag, but a manual full will deal with both. In short, I wouldn't put too
> much energy into it, unless the simple solution doesn't work ...
> <oto.pako...@.gmail.com> wrote in message
> news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
>
>
>
>
>
>
> - Zobrazi=BB citovan=FD text -
Now I altered db_backupoperator role for MSDB by user running backup
script. soi I will see if it help.|||Perhaps you do some type of snapshot backup on the machine and this interfer
es in some way with the
diff backups? Consider disabling the SQL Server VSS writer service in that c
ase. Just a thought...
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://sqlblog.com/blogs/tibor_karaszi
<oto.pakozdy@.gmail.com> wrote in message
news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.|||I usually run this to get the history of backups for a specific database.
Try it and see what information it returns. Chage database name and pay
atention to the type column.
select backup_set_id, bs.media_set_id, database_creation_date,
backup_start_date, backup_finish_date,
type, database_name, physical_device_name
from backupset bs join backupmediafamily bmf
on bs.media_set_id = bmf.media_set_id
where database_name = 'your_db'
-- and type <> 'L'
order by backup_start_date desc
Hope this helps,
Ben Nevarez
Senior Database Administrator
AIG SunAmerica
"oto.pakozdy@.gmail.com" wrote:

> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.
>|||I found solution on google
Problem is MSSQL SP2 changed startup state SQL Server VSS Writer from
manual to started . So when NTbackup run backup it breaks backup
chain because vss make own db backups.
So when I turn off SQL VSS Writer everyting works fine.
ntbackup backup files without backuping db and sql backup chain
full,diff is not break.
Thank for your hints.|||Hello, I think i meet the same problem. but you said you have find the
resolution on google. Could you please give me the link that describe the
problem?
Thanks,
Gil
"oto.pakozdy@.gmail.com" wrote:

> I found solution on google
> Problem is MSSQL SP2 changed startup state SQL Server VSS Writer from
> manual to started . So when NTbackup run backup it breaks backup
> chain because vss make own db backups.
> So when I turn off SQL VSS Writer everyting works fine.
> ntbackup backup files without backuping db and sql backup chain
> full,diff is not break.
>
> Thank for your hints.
>

full and diff backup - sql2005

hello...
I've got problem with backups on sql2005
script make backup at saturday with full backup and at monday script
runs diff backup. On one of few sqlservers2005 diff backups doesn't
run because because error: "a current database backup does not
exist" . But I know full backup was executed corectly on saturday.
In backup file , that is used for diff backup exists record for
saturday's full backup. But server can't recognize full backup for
db.
When I run full backup again, it run sucessfully and diff backup
too.
This error is only on one server (named instance), other servers are
ok.
Any hints for this mystery ?
Thanks for any help.
Well, try doing a manual full and see if it resolves.
I'm not sure if the backup is looking at logs in msdb, or if it writes a
flag, but a manual full will deal with both. In short, I wouldn't put too
much energy into it, unless the simple solution doesn't work ...
<oto.pakozdy@.gmail.com> wrote in message
news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.
|||On 27. Nov, 16:57 h., "Jay" <s...@.nospam.org> wrote:
> Well, try doing a manual full and see if it resolves.
> I'm not sure if the backup is looking at logs in msdb, or if it writes a
> flag, but a manual full will deal with both. In short, I wouldn't put too
> much energy into it, unless the simple solution doesn't work ...
> <oto.pako...@.gmail.com> wrote in message
> news:2398bfcd-fa45-4a4f-ade4-915159aebbea@.d21g2000prf.googlegroups.com...
>
>
>
>
> - Zobrazi citovan text -
Now I altered db_backupoperator role for MSDB by user running backup
script. soi I will see if it help.
|||I usually run this to get the history of backups for a specific database.
Try it and see what information it returns. Chage database name and pay
atention to the type column.
select backup_set_id, bs.media_set_id, database_creation_date,
backup_start_date, backup_finish_date,
type, database_name, physical_device_name
from backupset bs join backupmediafamily bmf
on bs.media_set_id = bmf.media_set_id
where database_name = 'your_db'
-- and type <> 'L'
order by backup_start_date desc
Hope this helps,
Ben Nevarez
Senior Database Administrator
AIG SunAmerica
"oto.pakozdy@.gmail.com" wrote:

> hello...
> I've got problem with backups on sql2005
> script make backup at saturday with full backup and at monday script
> runs diff backup. On one of few sqlservers2005 diff backups doesn't
> run because because error: "a current database backup does not
> exist" . But I know full backup was executed corectly on saturday.
> In backup file , that is used for diff backup exists record for
> saturday's full backup. But server can't recognize full backup for
> db.
> When I run full backup again, it run sucessfully and diff backup
> too.
> This error is only on one server (named instance), other servers are
> ok.
> Any hints for this mystery ?
> Thanks for any help.
>
|||I found solution on google
Problem is MSSQL SP2 changed startup state SQL Server VSS Writer from
manual to started . So when NTbackup run backup it breaks backup
chain because vss make own db backups.
So when I turn off SQL VSS Writer everyting works fine.
ntbackup backup files without backuping db and sql backup chain
full,diff is not break.
Thank for your hints.
|||Hello, I think i meet the same problem. but you said you have find the
resolution on google. Could you please give me the link that describe the
problem?
Thanks,
Gil
"oto.pakozdy@.gmail.com" wrote:

> I found solution on google
> Problem is MSSQL SP2 changed startup state SQL Server VSS Writer from
> manual to started . So when NTbackup run backup it breaks backup
> chain because vss make own db backups.
> So when I turn off SQL VSS Writer everyting works fine.
> ntbackup backup files without backuping db and sql backup chain
> full,diff is not break.
>
> Thank for your hints.
>