PHWinfo banniere

Titres
PORTAIL ANNUAIRE ARTICLES COMPARATEUR HÉBERGEURS DEVIS FORUMS RÉDUCTEUR D'URL
Précédent   PHWinfo > Forums Hébergement > Forum Hébergement serveur > ms.sqlserver.setup > Backups and Transaction Log file size
S'inscrire FAQ Membres Recherche Messages du jour Marquer les forums comme lus
ms.sqlserver.setup Questions about SQL Server.

Backups and Transaction Log file size

Réponse
 
LinkBack Outils de la discussion
Vieux 14/05/2008, 07h50   #1
Bill Bradley
Aucun Avatar
 
Messages: n/a
Hébergeur:
Par défaut Backups and Transaction Log file size

I am slowly going insane trying to figure out backups.

From all that I read and understand, the purpose of the transaction log is
to save actions until committed to the actual db, and, a backup of both db
and log should committ things and the log would get smaller (or at least have
more empty space).

Instead, I have a log that is growing bigger and bigger, and, is much larger
(1.3 Gb vs. 370 MB) than the DB.

I am using SQL 2K5 Ent SP2 with latest patches and hotfix rollup. The
database Recovery Model is Full. Each morning I run a maintenance plan that
includes backup of the db file, then the transaction log file (I later added
a second backup of the db file right after the transaction log file backup,
as I was unsure of the correct sequence). Each day, both files steadily get
bigger, with backups doing nothing to decrease the size (or available
freespace of the log file).

What do I not understand, or, am doing wrong?

I wouldn't care about the size (not out of room or anything), but, the speed
of the application using the database files gets REAL slow, the bigger the
log gets.

Thanks.
  Réponse avec citation
Vieux 14/05/2008, 17h38   #2
Andrew J. Kelly
Aucun Avatar
 
Messages: n/a
Hébergeur:
Par défaut Re: Backups and Transaction Log file size

Bill,

The purpose of the Transaction log is to ensure database consistency in the
event of say a failure. When any DDL or DML is done the actions are first
written to the transaction log. When then transaction is committed or rolled
back those actions are then forced to disk immediately before the actual
data changes are. This ensures that if in the middle of a tran the power
dies, when it comes back on line it will have the necessary information to
either roll forward or roll back the changes to get it to a consistent
state. Since the actual data pages are written in a lazy fashion the log
needs to be hardened to disk to enforce that consistent state. A FULL backup
simply copies all the data pages to the backup file and does not (basically)
do anything to the transaction log file itself. Log entries will keep
filling up the log file until there is no more room at which time the log
file needs to expand to allow the new transactions. The area in the log file
that holds older committed trans cannot be reused until they have been
backed up via a transaction log backup. Once the committed trans have been
backed up the space can then be reused for new trans. An exception is if
there is a long open running tran. Even though the entries in the log file
have been backed up to disk the area can not be truncated and reused until
that open tran is either rolled back or committed. You can check for long
running open trans with the DBCC OPENTRAN() command. But a couple of key
points. Backups (either FULL or log) do not shrink the file. You need to use
DBCC SHRINKFILE for that and it should only be used when you have way too
much extra free space in the file since free space is required for normal
operation. And second the only thing that will allow the space for the
committed trans to be truncated and reused is a LOG backup. Issuing a LOG
backup once a day is almost useless since your FULL backup will do almost
the same thing. Once every 15 minutes or so is what a typical system will
do. That allows the file to stay at a reasonable size and you get maximum
recoverability in the event you have a problem.

--
Andrew J. Kelly SQL MVP
Solid Quality Mentors


"Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
news:839381F3-81A5-4BEF-A96C-6E1FD45FEEC8@microsoft.com...
>I am slowly going insane trying to figure out backups.
>
> From all that I read and understand, the purpose of the transaction log is
> to save actions until committed to the actual db, and, a backup of both db
> and log should committ things and the log would get smaller (or at least
> have
> more empty space).
>
> Instead, I have a log that is growing bigger and bigger, and, is much
> larger
> (1.3 Gb vs. 370 MB) than the DB.
>
> I am using SQL 2K5 Ent SP2 with latest patches and hotfix rollup. The
> database Recovery Model is Full. Each morning I run a maintenance plan
> that
> includes backup of the db file, then the transaction log file (I later
> added
> a second backup of the db file right after the transaction log file
> backup,
> as I was unsure of the correct sequence). Each day, both files steadily
> get
> bigger, with backups doing nothing to decrease the size (or available
> freespace of the log file).
>
> What do I not understand, or, am doing wrong?
>
> I wouldn't care about the size (not out of room or anything), but, the
> speed
> of the application using the database files gets REAL slow, the bigger the
> log gets.
>
> Thanks.


  Réponse avec citation
Vieux 14/05/2008, 17h54   #3
Bill Bradley
Aucun Avatar
 
Messages: n/a
Hébergeur:
Par défaut Re: Backups and Transaction Log file size

Andrew,

What you say is what I thought I understood (although I didn't understand
that a FULL Backup didn't do the Log file, too).

However...in my case, I'm using a product to scan and deploy for patches,
Shavlik NetChk Protect, and, do two scans and deploys daily to 2500 computers
(to catch new ones and those that were off). This produces a heathy amount
of log file size, and, it was NOT getting smaller, but, actually got up to
9.5 GB (database size was < 500 MB at its largest), even though I was doing
daily Full backups (and...backups were successful).

When I attempted to shrink the log file, there was only 25 MB free, so...the
logs were not being committed or truncated.

Even after I added Transaction Log backups, there remained only 50 MB free,
out of 9 GB.

I ran sys.databases dump, and the columns about transaction file truncation
were 2 and waiting for backup.

So...even though I was backing up both files, the logs, which SHOULD have
gotten if not smaller, at least with more free space, were not changing.

And...for whatever reason, the size of the log file causes a HUGE response
slowdown in the product--making it almost unusable.

Thanks.

"Andrew J. Kelly" wrote:

> Bill,
>
> The purpose of the Transaction log is to ensure database consistency in the
> event of say a failure. When any DDL or DML is done the actions are first
> written to the transaction log. When then transaction is committed or rolled
> back those actions are then forced to disk immediately before the actual
> data changes are. This ensures that if in the middle of a tran the power
> dies, when it comes back on line it will have the necessary information to
> either roll forward or roll back the changes to get it to a consistent
> state. Since the actual data pages are written in a lazy fashion the log
> needs to be hardened to disk to enforce that consistent state. A FULL backup
> simply copies all the data pages to the backup file and does not (basically)
> do anything to the transaction log file itself. Log entries will keep
> filling up the log file until there is no more room at which time the log
> file needs to expand to allow the new transactions. The area in the log file
> that holds older committed trans cannot be reused until they have been
> backed up via a transaction log backup. Once the committed trans have been
> backed up the space can then be reused for new trans. An exception is if
> there is a long open running tran. Even though the entries in the log file
> have been backed up to disk the area can not be truncated and reused until
> that open tran is either rolled back or committed. You can check for long
> running open trans with the DBCC OPENTRAN() command. But a couple of key
> points. Backups (either FULL or log) do not shrink the file. You need to use
> DBCC SHRINKFILE for that and it should only be used when you have way too
> much extra free space in the file since free space is required for normal
> operation. And second the only thing that will allow the space for the
> committed trans to be truncated and reused is a LOG backup. Issuing a LOG
> backup once a day is almost useless since your FULL backup will do almost
> the same thing. Once every 15 minutes or so is what a typical system will
> do. That allows the file to stay at a reasonable size and you get maximum
> recoverability in the event you have a problem.
>
> --
> Andrew J. Kelly SQL MVP
> Solid Quality Mentors
>
>
> "Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
> news:839381F3-81A5-4BEF-A96C-6E1FD45FEEC8@microsoft.com...
> >I am slowly going insane trying to figure out backups.
> >
> > From all that I read and understand, the purpose of the transaction log is
> > to save actions until committed to the actual db, and, a backup of both db
> > and log should committ things and the log would get smaller (or at least
> > have
> > more empty space).
> >
> > Instead, I have a log that is growing bigger and bigger, and, is much
> > larger
> > (1.3 Gb vs. 370 MB) than the DB.
> >
> > I am using SQL 2K5 Ent SP2 with latest patches and hotfix rollup. The
> > database Recovery Model is Full. Each morning I run a maintenance plan
> > that
> > includes backup of the db file, then the transaction log file (I later
> > added
> > a second backup of the db file right after the transaction log file
> > backup,
> > as I was unsure of the correct sequence). Each day, both files steadily
> > get
> > bigger, with backups doing nothing to decrease the size (or available
> > freespace of the log file).
> >
> > What do I not understand, or, am doing wrong?
> >
> > I wouldn't care about the size (not out of room or anything), but, the
> > speed
> > of the application using the database files gets REAL slow, the bigger the
> > log gets.
> >
> > Thanks.

>
>

  Réponse avec citation
Vieux 14/05/2008, 23h48   #4
Andrew J. Kelly
Aucun Avatar
 
Messages: n/a
Hébergeur:
Par défaut Re: Backups and Transaction Log file size

It sounds like a classic case of a long running open transaction. If some
one or something started a tran 10 days ago and never committed it you can
not reuse that portion of the log so it will just grow and grow. If you run
DBCC OPENTRAN() in the context of that db it should tell you if this is the
case or not. Find the client and either commit or roll it back. If you know
it is a garbage connection you can kill the SPID and it will roll back any
changes that the SPID may have open and allow you to backup and truncate
properly.

--
Andrew J. Kelly SQL MVP
Solid Quality Mentors


"Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
news:5C13A2B3-DFFA-4ED4-AC9E-7368E561580B@microsoft.com...
> Andrew,
>
> What you say is what I thought I understood (although I didn't understand
> that a FULL Backup didn't do the Log file, too).
>
> However...in my case, I'm using a product to scan and deploy for patches,
> Shavlik NetChk Protect, and, do two scans and deploys daily to 2500
> computers
> (to catch new ones and those that were off). This produces a heathy
> amount
> of log file size, and, it was NOT getting smaller, but, actually got up to
> 9.5 GB (database size was < 500 MB at its largest), even though I was
> doing
> daily Full backups (and...backups were successful).
>
> When I attempted to shrink the log file, there was only 25 MB free,
> so...the
> logs were not being committed or truncated.
>
> Even after I added Transaction Log backups, there remained only 50 MB
> free,
> out of 9 GB.
>
> I ran sys.databases dump, and the columns about transaction file
> truncation
> were 2 and waiting for backup.
>
> So...even though I was backing up both files, the logs, which SHOULD have
> gotten if not smaller, at least with more free space, were not changing.
>
> And...for whatever reason, the size of the log file causes a HUGE response
> slowdown in the product--making it almost unusable.
>
> Thanks.
>
> "Andrew J. Kelly" wrote:
>
>> Bill,
>>
>> The purpose of the Transaction log is to ensure database consistency in
>> the
>> event of say a failure. When any DDL or DML is done the actions are
>> first
>> written to the transaction log. When then transaction is committed or
>> rolled
>> back those actions are then forced to disk immediately before the actual
>> data changes are. This ensures that if in the middle of a tran the power
>> dies, when it comes back on line it will have the necessary information
>> to
>> either roll forward or roll back the changes to get it to a consistent
>> state. Since the actual data pages are written in a lazy fashion the log
>> needs to be hardened to disk to enforce that consistent state. A FULL
>> backup
>> simply copies all the data pages to the backup file and does not
>> (basically)
>> do anything to the transaction log file itself. Log entries will keep
>> filling up the log file until there is no more room at which time the log
>> file needs to expand to allow the new transactions. The area in the log
>> file
>> that holds older committed trans cannot be reused until they have been
>> backed up via a transaction log backup. Once the committed trans have
>> been
>> backed up the space can then be reused for new trans. An exception is if
>> there is a long open running tran. Even though the entries in the log
>> file
>> have been backed up to disk the area can not be truncated and reused
>> until
>> that open tran is either rolled back or committed. You can check for long
>> running open trans with the DBCC OPENTRAN() command. But a couple of key
>> points. Backups (either FULL or log) do not shrink the file. You need to
>> use
>> DBCC SHRINKFILE for that and it should only be used when you have way too
>> much extra free space in the file since free space is required for normal
>> operation. And second the only thing that will allow the space for the
>> committed trans to be truncated and reused is a LOG backup. Issuing a
>> LOG
>> backup once a day is almost useless since your FULL backup will do almost
>> the same thing. Once every 15 minutes or so is what a typical system will
>> do. That allows the file to stay at a reasonable size and you get maximum
>> recoverability in the event you have a problem.
>>
>> --
>> Andrew J. Kelly SQL MVP
>> Solid Quality Mentors
>>
>>
>> "Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
>> news:839381F3-81A5-4BEF-A96C-6E1FD45FEEC8@microsoft.com...
>> >I am slowly going insane trying to figure out backups.
>> >
>> > From all that I read and understand, the purpose of the transaction log
>> > is
>> > to save actions until committed to the actual db, and, a backup of both
>> > db
>> > and log should committ things and the log would get smaller (or at
>> > least
>> > have
>> > more empty space).
>> >
>> > Instead, I have a log that is growing bigger and bigger, and, is much
>> > larger
>> > (1.3 Gb vs. 370 MB) than the DB.
>> >
>> > I am using SQL 2K5 Ent SP2 with latest patches and hotfix rollup. The
>> > database Recovery Model is Full. Each morning I run a maintenance plan
>> > that
>> > includes backup of the db file, then the transaction log file (I later
>> > added
>> > a second backup of the db file right after the transaction log file
>> > backup,
>> > as I was unsure of the correct sequence). Each day, both files
>> > steadily
>> > get
>> > bigger, with backups doing nothing to decrease the size (or available
>> > freespace of the log file).
>> >
>> > What do I not understand, or, am doing wrong?
>> >
>> > I wouldn't care about the size (not out of room or anything), but, the
>> > speed
>> > of the application using the database files gets REAL slow, the bigger
>> > the
>> > log gets.
>> >
>> > Thanks.

>>
>>


  Réponse avec citation
Vieux 15/05/2008, 00h01   #5
Bill Bradley
Aucun Avatar
 
Messages: n/a
Hébergeur:
Par défaut Re: Backups and Transaction Log file size

Thanks, Andrew!

I had run DBCC OpenTran(), and, nothing was shown as holding things open. I
kinda think it might be corrupt, or, something, now...

I'm thinking of just changing it from Full to Simple, and, be done with it...

"Andrew J. Kelly" wrote:

> It sounds like a classic case of a long running open transaction. If some
> one or something started a tran 10 days ago and never committed it you can
> not reuse that portion of the log so it will just grow and grow. If you run
> DBCC OPENTRAN() in the context of that db it should tell you if this is the
> case or not. Find the client and either commit or roll it back. If you know
> it is a garbage connection you can kill the SPID and it will roll back any
> changes that the SPID may have open and allow you to backup and truncate
> properly.
>
> --
> Andrew J. Kelly SQL MVP
> Solid Quality Mentors
>
>
> "Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
> news:5C13A2B3-DFFA-4ED4-AC9E-7368E561580B@microsoft.com...
> > Andrew,
> >
> > What you say is what I thought I understood (although I didn't understand
> > that a FULL Backup didn't do the Log file, too).
> >
> > However...in my case, I'm using a product to scan and deploy for patches,
> > Shavlik NetChk Protect, and, do two scans and deploys daily to 2500
> > computers
> > (to catch new ones and those that were off). This produces a heathy
> > amount
> > of log file size, and, it was NOT getting smaller, but, actually got up to
> > 9.5 GB (database size was < 500 MB at its largest), even though I was
> > doing
> > daily Full backups (and...backups were successful).
> >
> > When I attempted to shrink the log file, there was only 25 MB free,
> > so...the
> > logs were not being committed or truncated.
> >
> > Even after I added Transaction Log backups, there remained only 50 MB
> > free,
> > out of 9 GB.
> >
> > I ran sys.databases dump, and the columns about transaction file
> > truncation
> > were 2 and waiting for backup.
> >
> > So...even though I was backing up both files, the logs, which SHOULD have
> > gotten if not smaller, at least with more free space, were not changing.
> >
> > And...for whatever reason, the size of the log file causes a HUGE response
> > slowdown in the product--making it almost unusable.
> >
> > Thanks.
> >
> > "Andrew J. Kelly" wrote:
> >
> >> Bill,
> >>
> >> The purpose of the Transaction log is to ensure database consistency in
> >> the
> >> event of say a failure. When any DDL or DML is done the actions are
> >> first
> >> written to the transaction log. When then transaction is committed or
> >> rolled
> >> back those actions are then forced to disk immediately before the actual
> >> data changes are. This ensures that if in the middle of a tran the power
> >> dies, when it comes back on line it will have the necessary information
> >> to
> >> either roll forward or roll back the changes to get it to a consistent
> >> state. Since the actual data pages are written in a lazy fashion the log
> >> needs to be hardened to disk to enforce that consistent state. A FULL
> >> backup
> >> simply copies all the data pages to the backup file and does not
> >> (basically)
> >> do anything to the transaction log file itself. Log entries will keep
> >> filling up the log file until there is no more room at which time the log
> >> file needs to expand to allow the new transactions. The area in the log
> >> file
> >> that holds older committed trans cannot be reused until they have been
> >> backed up via a transaction log backup. Once the committed trans have
> >> been
> >> backed up the space can then be reused for new trans. An exception is if
> >> there is a long open running tran. Even though the entries in the log
> >> file
> >> have been backed up to disk the area can not be truncated and reused
> >> until
> >> that open tran is either rolled back or committed. You can check for long
> >> running open trans with the DBCC OPENTRAN() command. But a couple of key
> >> points. Backups (either FULL or log) do not shrink the file. You need to
> >> use
> >> DBCC SHRINKFILE for that and it should only be used when you have way too
> >> much extra free space in the file since free space is required for normal
> >> operation. And second the only thing that will allow the space for the
> >> committed trans to be truncated and reused is a LOG backup. Issuing a
> >> LOG
> >> backup once a day is almost useless since your FULL backup will do almost
> >> the same thing. Once every 15 minutes or so is what a typical system will
> >> do. That allows the file to stay at a reasonable size and you get maximum
> >> recoverability in the event you have a problem.
> >>
> >> --
> >> Andrew J. Kelly SQL MVP
> >> Solid Quality Mentors
> >>
> >>
> >> "Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
> >> news:839381F3-81A5-4BEF-A96C-6E1FD45FEEC8@microsoft.com...
> >> >I am slowly going insane trying to figure out backups.
> >> >
> >> > From all that I read and understand, the purpose of the transaction log
> >> > is
> >> > to save actions until committed to the actual db, and, a backup of both
> >> > db
> >> > and log should committ things and the log would get smaller (or at
> >> > least
> >> > have
> >> > more empty space).
> >> >
> >> > Instead, I have a log that is growing bigger and bigger, and, is much
> >> > larger
> >> > (1.3 Gb vs. 370 MB) than the DB.
> >> >
> >> > I am using SQL 2K5 Ent SP2 with latest patches and hotfix rollup. The
> >> > database Recovery Model is Full. Each morning I run a maintenance plan
> >> > that
> >> > includes backup of the db file, then the transaction log file (I later
> >> > added
> >> > a second backup of the db file right after the transaction log file
> >> > backup,
> >> > as I was unsure of the correct sequence). Each day, both files
> >> > steadily
> >> > get
> >> > bigger, with backups doing nothing to decrease the size (or available
> >> > freespace of the log file).
> >> >
> >> > What do I not understand, or, am doing wrong?
> >> >
> >> > I wouldn't care about the size (not out of room or anything), but, the
> >> > speed
> >> > of the application using the database files gets REAL slow, the bigger
> >> > the
> >> > log gets.
> >> >
> >> > Thanks.
> >>
> >>

>
>

  Réponse avec citation
Vieux 15/05/2008, 16h35   #6
Andrew J. Kelly
Aucun Avatar
 
Messages: n/a
Hébergeur:
Par défaut Re: Backups and Transaction Log file size

Did you run it in the context of that db or in master? It needs to be in the
particular db. If it is a problem with open trans changing to simple won't
fix that. You can try stopping and restarting SQL Server as that will roll
back any open trans when it restarts.

--
Andrew J. Kelly SQL MVP
Solid Quality Mentors


"Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
news:AACF1AB9-1A61-4486-9B19-41DFCC062610@microsoft.com...
> Thanks, Andrew!
>
> I had run DBCC OpenTran(), and, nothing was shown as holding things open.
> I
> kinda think it might be corrupt, or, something, now...
>
> I'm thinking of just changing it from Full to Simple, and, be done with
> it...
>
> "Andrew J. Kelly" wrote:
>
>> It sounds like a classic case of a long running open transaction. If
>> some
>> one or something started a tran 10 days ago and never committed it you
>> can
>> not reuse that portion of the log so it will just grow and grow. If you
>> run
>> DBCC OPENTRAN() in the context of that db it should tell you if this is
>> the
>> case or not. Find the client and either commit or roll it back. If you
>> know
>> it is a garbage connection you can kill the SPID and it will roll back
>> any
>> changes that the SPID may have open and allow you to backup and truncate
>> properly.
>>
>> --
>> Andrew J. Kelly SQL MVP
>> Solid Quality Mentors
>>
>>
>> "Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in message
>> news:5C13A2B3-DFFA-4ED4-AC9E-7368E561580B@microsoft.com...
>> > Andrew,
>> >
>> > What you say is what I thought I understood (although I didn't
>> > understand
>> > that a FULL Backup didn't do the Log file, too).
>> >
>> > However...in my case, I'm using a product to scan and deploy for
>> > patches,
>> > Shavlik NetChk Protect, and, do two scans and deploys daily to 2500
>> > computers
>> > (to catch new ones and those that were off). This produces a heathy
>> > amount
>> > of log file size, and, it was NOT getting smaller, but, actually got up
>> > to
>> > 9.5 GB (database size was < 500 MB at its largest), even though I was
>> > doing
>> > daily Full backups (and...backups were successful).
>> >
>> > When I attempted to shrink the log file, there was only 25 MB free,
>> > so...the
>> > logs were not being committed or truncated.
>> >
>> > Even after I added Transaction Log backups, there remained only 50 MB
>> > free,
>> > out of 9 GB.
>> >
>> > I ran sys.databases dump, and the columns about transaction file
>> > truncation
>> > were 2 and waiting for backup.
>> >
>> > So...even though I was backing up both files, the logs, which SHOULD
>> > have
>> > gotten if not smaller, at least with more free space, were not
>> > changing.
>> >
>> > And...for whatever reason, the size of the log file causes a HUGE
>> > response
>> > slowdown in the product--making it almost unusable.
>> >
>> > Thanks.
>> >
>> > "Andrew J. Kelly" wrote:
>> >
>> >> Bill,
>> >>
>> >> The purpose of the Transaction log is to ensure database consistency
>> >> in
>> >> the
>> >> event of say a failure. When any DDL or DML is done the actions are
>> >> first
>> >> written to the transaction log. When then transaction is committed or
>> >> rolled
>> >> back those actions are then forced to disk immediately before the
>> >> actual
>> >> data changes are. This ensures that if in the middle of a tran the
>> >> power
>> >> dies, when it comes back on line it will have the necessary
>> >> information
>> >> to
>> >> either roll forward or roll back the changes to get it to a consistent
>> >> state. Since the actual data pages are written in a lazy fashion the
>> >> log
>> >> needs to be hardened to disk to enforce that consistent state. A FULL
>> >> backup
>> >> simply copies all the data pages to the backup file and does not
>> >> (basically)
>> >> do anything to the transaction log file itself. Log entries will keep
>> >> filling up the log file until there is no more room at which time the
>> >> log
>> >> file needs to expand to allow the new transactions. The area in the
>> >> log
>> >> file
>> >> that holds older committed trans cannot be reused until they have been
>> >> backed up via a transaction log backup. Once the committed trans have
>> >> been
>> >> backed up the space can then be reused for new trans. An exception is
>> >> if
>> >> there is a long open running tran. Even though the entries in the log
>> >> file
>> >> have been backed up to disk the area can not be truncated and reused
>> >> until
>> >> that open tran is either rolled back or committed. You can check for
>> >> long
>> >> running open trans with the DBCC OPENTRAN() command. But a couple of
>> >> key
>> >> points. Backups (either FULL or log) do not shrink the file. You need
>> >> to
>> >> use
>> >> DBCC SHRINKFILE for that and it should only be used when you have way
>> >> too
>> >> much extra free space in the file since free space is required for
>> >> normal
>> >> operation. And second the only thing that will allow the space for
>> >> the
>> >> committed trans to be truncated and reused is a LOG backup. Issuing a
>> >> LOG
>> >> backup once a day is almost useless since your FULL backup will do
>> >> almost
>> >> the same thing. Once every 15 minutes or so is what a typical system
>> >> will
>> >> do. That allows the file to stay at a reasonable size and you get
>> >> maximum
>> >> recoverability in the event you have a problem.
>> >>
>> >> --
>> >> Andrew J. Kelly SQL MVP
>> >> Solid Quality Mentors
>> >>
>> >>
>> >> "Bill Bradley" <BillBradley@discussions.microsoft.com> wrote in
>> >> message
>> >> news:839381F3-81A5-4BEF-A96C-6E1FD45FEEC8@microsoft.com...
>> >> >I am slowly going insane trying to figure out backups.
>> >> >
>> >> > From all that I read and understand, the purpose of the transaction
>> >> > log
>> >> > is
>> >> > to save actions until committed to the actual db, and, a backup of
>> >> > both
>> >> > db
>> >> > and log should committ things and the log would get smaller (or at
>> >> > least
>> >> > have
>> >> > more empty space).
>> >> >
>> >> > Instead, I have a log that is growing bigger and bigger, and, is
>> >> > much
>> >> > larger
>> >> > (1.3 Gb vs. 370 MB) than the DB.
>> >> >
>> >> > I am using SQL 2K5 Ent SP2 with latest patches and hotfix rollup.
>> >> > The
>> >> > database Recovery Model is Full. Each morning I run a maintenance
>> >> > plan
>> >> > that
>> >> > includes backup of the db file, then the transaction log file (I
>> >> > later
>> >> > added
>> >> > a second backup of the db file right after the transaction log file
>> >> > backup,
>> >> > as I was unsure of the correct sequence). Each day, both files
>> >> > steadily
>> >> > get
>> >> > bigger, with backups doing nothing to decrease the size (or
>> >> > available
>> >> > freespace of the log file).
>> >> >
>> >> > What do I not understand, or, am doing wrong?
>> >> >
>> >> > I wouldn't care about the size (not out of room or anything), but,
>> >> > the
>> >> > speed
>> >> > of the application using the database files gets REAL slow, the
>> >> > bigger
>> >> > the
>> >> > log gets.
>> >> >
>> >> > Thanks.
>> >>
>> >>

>>
>>


  Réponse avec citation
Réponse


Outils de la discussion

Règles de messages
Vous ne pouvez pas créer de nouvelles discussions
Vous ne pouvez pas envoyer des réponses
Vous ne pouvez pas envoyer des pièces jointes
Vous ne pouvez pas modifier vos messages

Les balises BB sont activées : oui
Les smileys sont activés : oui
La balise [IMG] est activée : oui
Le code HTML peut être employé : non
Trackbacks are oui
Pingbacks are oui
Refbacks are oui


Fuseau horaire GMT +1. Il est actuellement 17h30.


Édité par : vBulletin® version 3.7.4
Copyright ©2000 - 2008, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.2.0 RC5 Tous droits réservés.
Version française #16 par l'association vBulletin francophone
PHWinfo est un site Éducation Sans Frontières ©2000-2008
Ad Management by RedTyger
©Tous droits réservés par les parties respectives
Page generated in 0,29252 seconds with 14 queries