Differential And Full Backups
Jan 11, 2001
PLEASE HELP...
WE ARE DOWNLOADING THE BACKUP FILE FROM OTHER BRANCH OFFICE AND THE FILE SIZE IS GROWING LIKE HELL SO I AM CHANGING THE BACKUP POLICY TO DOWNLOAD THE DIFFERENTIAL BACKUP FILES EVERYDAY. BUT EVEN THE FILE SIZE GROWS DAY BY DAY UNTILL WE TAKE THE FULL BACKUP THERE. SO I WANT TO TAKE A DIIFERNETIAL BACKUP AND THEN IMMIDIATELY A FULL BACKUP AT THE REMOTE SERVER END. SO MY NEXT DIFFERNTIAL BACKUP WILL HAVE THE DATA OF ONLY PREVIOUS DAY.
FOR THIS I AM SCHEDULING A JOB WHICH FIRST TAKES A DIFFERENTIAL BACKUP AND THEN IMMIDIATELY FULL BACKUP EVERYDAY AT 12.00AM.
BUT I HAVE A CONCERN.. WHILE TAKING THE DIFFERENTIAL BACKUP ANY TRANSACTIONS THAT ARE TO BE COMMITED WILL NOT COMMIT UNTIL THE DIFFERENTIAL BACKUP COMPLETES. BUT IMMIDIATELY I AM STARTING FULL BACKUP. IS THERE ANY CHANCE THAT A TRANSACTION GETTING COMMITTED IN BETWEEN THESE TWO STEPS. IF SO IS THERE ANY WAY .. NOT RELEASE THE DATABASE UNTILL THESE 2 BACKUPS ARE COMPLETED?? I AM RUNNING IT AS A JOB..
ANY SUGGESTION??
THANKS IN ADVANCE.. :-)
KUMAR
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Mar 28, 2007
Does the full and differential backups have to be in the same location or can I do a once a week full backup on one drive and everyday differential backups on a different drive?
Thanks
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May 12, 2008
Hi sql server experts.
This is a beginners question.
Let's say, I run a full backup at 4:30 am it takes usually 35 minutes to finish.
I want to schedule a differential backup to run every hour.
Should I start this job at 5:10 after the full backup finishes? or it doesn't matter?
I am confused about timing.
Let's say my full back up takes 1 hour to finish, that means that when the differential backup runs the full backup will be still running, so in case I need to restore the database, can I use this differential from 5:10 or the differential from 6:10.
Same issue with the transactional, the job runs every 30 minutes, should I started after the differential is done?
I am so confused, what happens with the backups jobs that run while other backups are running?
Is this something that should never happen.
Please advise.
Thanks
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Feb 19, 2015
Using Ola Hallengren's scripts I do a full backup of a database on a Sunday. Then differential backups every 6 hours and log backups every hour. I would like to keep a full week of backups based off the full backup done on Sunday. Is there a way for me to clear out the diff and log folders after the successful full backup on Sunday nights?
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May 2, 2002
I know that the differential backup will only back up information that was changed since the last full database backup, but I have process that I need to implement and need to know if differentials will work.
1. Perform full database backup on Sunday.
2. Perform differential backups Monday thru Friday (twice a day).
3. Perform a database restore on the following Sunday from the backup taken on the previous Sunday.
4. Perform differential backups Monday thru Friday.
At this point I would repeat steps 3 and 4 for the following weeks.
My question is this. Since I didn't actually perform a backup in step 3, but instead performed a database restore, will the differential backup in step 4 backup all of the information changed since step 1??..or will it backup all of the information changed since the restore in step 3? I'm hoping it will only back up the information changed since step 3.
Thanks!
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Jun 25, 2002
I perform a full database backup at night with a differential backup at noon each day. I created 2 devices to do this. Northwind (for full backups) and northwind_diff (for diff backups).
When the differential is run, it appends each day's noon backup to the northwind_diff file so the file doesn't really reflect only changes - it just keeps growing and growing. I'm using the following syntax to perform the diff backup.
backup database northwind to northwind_diff with differential
Is there a way to initilize the backup device(file) prior to the differential backup being done?
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Jul 23, 2001
Hello
I am using SQL 7 database maintenance plans to create full backups for all the databases on my server every night which expire after 7 days, and transaction log backups every hour on some of the databases which also expire after 7 days.
I want to add differential backups but the maintenance plan doesn't allow me to add those. How do I add them, and what naming conventions should I use? I want them to expire after 7 days, but want to backup every 4 hours.
Thanks
Steve.
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Aug 27, 2001
Hi, I would like to do the following;
Mon - Full Backup
Tue - Differential
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Aug 28, 2001
Hi, is anyone using differential backups? I would like to have separate differential backups but right now it keeps appending to one big differential backup. If they are separated the older backups can be deleted. How do you do this?
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Sep 12, 2001
I am setting up differential backups thru EM every 4 hours. I append to the existing file. Is there a way to tell it to delete the files older than 2 days thru EM. I looked at the job, there is now way to do this.
Thru Mainplans you can create differential backups, it doesn't show you the option..
Any clues will be appreciated.
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Sep 27, 2007
Hi Folks!
I did a few searches and found some interesting threads but was not able to understand much. :)
I recently jumped from support to a DBA position and am learning about SQL Server 2000.
My dilemma: We have a SQL 2000 server with about 500GB's worth of databases that has some jobs from the app locking up due to tape backups. I am performing Full nightly and 1/2hour transaction SQL backups. We run daily differential and weekly full tape backups. It is taking 14 hours to run tape backups daily, causing some of the application jobs to fail. So to test it, I stopped the tape job to run one night and none of the App jobs failed.
So, I am hoping that if I start running nightly differentials, weekly fulls, and 1/2 hour trans, it should work. However, I am not very familiar with Differential jobs as till today i have been using maintenance plans. :confused:
My ideal scenario is this: Differentials start on Sat morning and stop before the weekly backup runs on Friday and then delete the older file when starting a new one. Is this possible? how?
C= OS, D=Backup (Raid 0), G=Data (Raid 5), E=Logs(Raid5).
Any help would be appreciated, and obviously if I have missed some piece of information, please feel free to ask.
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Jan 11, 2002
Hi all
Can anybody explain why the size of a differential backup in SQL7 is MUCH higher than the one in SQL2000?
Do this test yourself: do a full backup of the pubs database in SQL7 , it will be around 1.5mb, do a differential backup, and it will be 2mb or 4mb.
If you do the same tests in SQL2000 the differential backup is around 200K.
thanks
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Feb 14, 2002
I am trying to set up a process where a differential backup is taken daily and applied to another DB. For some reason I cannot get the diff backup to restore. The full DB backup restored fine.
Server: Msg 3136, Level 16, State 1, Line 4
Cannot apply the differential backup on device 'diff' to database 'test'.
Server: Msg 3013, Level 16, State 1, Line 4
Backup or restore operation terminating abnormally.
Any suggestions? Thanks!
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Oct 19, 2005
Our production backup schedule is, FULL backup once a month and a DIFFERENTIAL backup every day.
We are starting the FULL and DIFFERENTIAL backups using something similar to
FULL Backup
backup database @DB to disk = @BackupFile
DIFFERENTIAL backup
backup database @DB to disk = @BackupFile WITH DIFFERENTIAL
A full backup was done on 10/6 and the DB size was 48GB. Since then we have been doing DIFFERENTIAL backups. I recently looked at the DIFFERENTIAL backup directory and found something I think is interesting.
10/07/2005 04:00 AM 8,604,160 prodDB_Diff_200510070400.BAK
10/08/2005 04:00 AM 1,144,320 prodDB_Diff_200510080400.BAK
10/09/2005 04:00 AM 1,134,080 prodDB_Diff_200510090400.BAK
10/10/2005 04:00 AM 21,185,024 prodDB_Diff_200510100400.BAK
10/11/2005 04:00 AM 7,119,360 prodDB_Diff_200510110400.BAK
10/12/2005 04:00 AM 163,669,504 prodDB_Diff_200510120400.BAK
10/13/2005 04:00 AM 14,743,040 prodDB_Diff_200510130400.BAK
10/14/2005 04:00 AM 120,875,520 prodDB_Diff_200510140400.BAK
10/15/2005 04:00 AM 1,216,000 prodDB_Diff_200510150400.BAK
10/16/2005 04:00 AM 5,139,968 prodDB_Diff_200510160400.BAK
10/17/2005 04:00 AM 4,277,760 prodDB_Diff_200510170400.BAK
10/18/2005 04:00 AM 2,778,624 prodDB_Diff_200510180400.BAK
10/19/2005 04:01 AM 750,575,104 prodDB_Diff_200510190400.BAK
My understanding of DIFFERENTIAL backups from books online is
"Specifies the database or file backup should consist only of the portions of the database or file changed since the last full backup"
MY Question:
Assuming I am understanding this correctly, all DIFFERENTIAL backups are independent of one another. If a failure happens, all I have to do is restore the latest FULL backup and then
restore the latest DIFFERENTIAL backup.
So, I would think the sizes of the backup files should be in ASCENDING order. Why is the size of the backup file from 10/15/2005 (1,216,000 bytes) smaller than the backup file from 10/14/2005 (120,875,520 bytes).
Assuming a crash happens on 10/15 5AM, I would restore the full backup from 10/6 and then restore the DIFF. backup from 10/15 4AM (Which will apply approx.. 1,216,000 bytes of data). So where has the data in the backup file from 10/14/2005 gone (120,875,520 bytes)?
Thanks
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Feb 12, 2008
Hi,
On our SQL Server 2005 SP 2 i recently updated our Backup Plan.
I now make a Full backup every night, Differential backup every hour and Transaction log backup every 15 minutes.
This all works fine all the time except sometimes when the differential and transaction log backups want to run on the same time and then 1 of the 2 fails.
The error i get is code 0xC0010018. Error loading a task.
I made 1 Maintenance Plan with a subplan for each backup type (Full, differ....), so i can schedule them the way i want.
Searched the internet for an answer but i couldn't find it. The tasks only fail when the run simultaneous. Starting them manually always works.
Anybody has an idea what i need to do to get this working properly?
Thanks!!
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Oct 15, 2014
I am using Ola Hallegren's scripts to do backups. He uses @Cleanup Time to delete backups older than a certain number of hours. My situation is I do a full backup of a database on Sunday and then I have a few Differentials and then log backups for the rest of the week. When Sunday rolls around again and my full backup is finished, I would like to delete all the differential backups and log backups. Any way that I could accomplish this using Ola's scripts?
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Dec 7, 2007
Hello SQL Server 2005 SE sp1.
Unable to take differential or transaction log backups. Get the error message a full backup need to be down. Have done a full backup. Immediately upon completion of full have tried diff and transaction log. Still no luck
Other databases on server are fine. Full backup will restore.
Thanks,
Joe
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Jul 16, 2007
We have a SQL 2K5 10GB database that, as part of the recovery plan, gets a differential backup every six hours. Log file backups occur every hour, and a full backup is done every 24 hours. Over the weekend, the differential backup produced a 55GB backup file which caused us a lot of issues besides disk space usage (log backups couldnt finish, mirroring broke, etc.). This is also the max growth size that the log file is set to. There are no errors in the ERRORLOG, or in the job history. It's as if the backup was successful, which I assume it was, but the file was sparse.
I should mention that our full backup is typically 10GB, log file backups are typically 100 to 500MB, and the diff backup is generally 1GB to 3GB.
Has anyone experienced this issue before?
What causes it?
How do we resolve it?
Thank you in advance for your help,
Greg
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Nov 15, 2015
The space allocated to the Log in question is 180 GB. During this time period I was running TLog backups every 5 minutes, yet the log continued to chew through to 80 GB used, even after the process was complete and a final TLog backup had been taken. It continued to stay very large until the Full backup was complete -- or something else that I'm unaware of completed. Like every other DBA I typically take a TLog backup to shrink the log, but what appeared to be the case here was the Full completed and it released the used log space. All said, will Transaction Log backups not free up the log during Full backups?
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Jul 14, 2006
Running SQL Server 2005 Standard Edition.
Database is in Full Recovery mode.
I have full backups scheduled weekly, differentails scheduled daily and tran log ackups scheduled for every 15 minutes.
The tran log backups only work for the first 40 minutes or so after the daily backup. Once the daily has occured, the tran backups will work again, but for only 40 minutes.
I run consistency checks on the db daily and there are no errors.
The error returned from the tran log backup is 'BACKUP LOG cannot be performed because there is no current database backup'
Any thoughts would be appreciated.
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Jun 15, 2015
We are running a SQL Server 2008R2 64-bit database system on a Windows 2012 R2 64-bit Standard system. I have noticed in recent weeks that our differential backups periodically are taking longer than expected to complete. The usual amount of time is about one hour, but on several occasions, it has taken upwards to five hours. The nights when the job takes longer to complete are on Friday.
I did some checking online, and one possible reason for this issue is my scheduling the reindexing of the database on the morning of the Differential backup. For example, this past Friday the reindexing occurred at 1:00 AM with the Differential running at 10:00 PM that night.The article that I read suggested the reindexing, which takes several minutes, if that, to complete, should be scheduled to run just before the Full backup job.
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Aug 28, 2007
Hi All,
I am trying to restore full backup in Sql Server 2005. I am using the following query to restore full backup.
"Restore database Testdb from Disk = 'C:Testdbfull.bak'
with move 'Testdb' to 'C:DBTestdb.mdf ',
move 'Testdb_log' to 'C:DBTestdb_log.ldf ', norecovery "
The above query is running successfully and database restored. But i am not able to access this database since in the database tab it is showing 'Testdb (Restoring)'
The next day I want to restore the differential database backup so i used the 'norecovery' statement.
please help why it is showing as '(Restoring)'
Thanks in advance,
Senthil
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Jul 23, 2005
My company needs to move a 30 Gig SQL Server across the country as soonas possble on July 1. Turns out moving the full db across the networktakes a few hours.I'd like to move a full copy of db a week ahead of time, and then justmove either a differential backup(s) or transaction log with with theweek's new data on July 1.Can anyone suggest the best strategy for doing this? Currently we'redoing a differential backup each hour on the db, and dumping the txnlog each night.Many thanks,Burt
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Sep 11, 2007
I want to set a full and differential backup to one database in sql server 2000.
Is there a way to set both full and differential to just one database.
i want the full backup weekly once and differential every day to set up.
Please let me know
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Jun 29, 2007
Hi,
After some advice - I have a SQL Server 2005 database which is part
of an anti-virus setup. The main database is 25Gb is size, and it
is running in simple recovery mode. There are two backup jobs in
place, one to do a differential backup each Mon-Sat, and one to
do a full backup on Sun. Although the backups do get done they
are taking 5 hours to do. Any wiz out there care to suggest what
the problem is, I would've though that maybe an hour was more
acceptable ?
Cheers,
Gordon
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Sep 13, 2006
I am running the following script to attempt a restore of a differential backup:
RESTORE DATABASE AdventureWorks
FROM DISK='C:SQL2005_BackupsAutoBackupsAdventureWorks.bak'
WITH
NORECOVERY
GO
RESTORE DATABASE AdventureWorks
FROM DISK='C:SQL2005_BackupsAutoBackupsAdventureWorksDiff.bak'
WITH RECOVERY
GO
I thought this was the way to do it. It does restore the full backup, but on the attempt to restore the differential backup, I get the following error:
Msg 3136, Level 16, State 1, Line 1
This differential backup cannot be restored because the database has not been restored to the correct earlier state.
Msg 3013, Level 16, State 1, Line 1
RESTORE DATABASE is terminating abnormally.
Does anyone know what this means? Do I have to use "with recovery" on the first restore? (The sample I took this from used "with norecovery")
The original backups were done with SQL Agent scheduled jobs. The script for the full backup is:
BACKUP DATABASE AdventureWorks
TO DISK='C:SQL2005_BackupsAutoBackupsAdventureWorks.bak'
The script for the differential backup is:
BACKUP DATABASE AdventureWorks
TO DISK='C:SQL2005_BackupsAutoBackupsAdventureWorksDiff.bak'
WITH DIFFERENTIAL, INIT
All I can say is, it's a good thing I am testing this out with non-critical data, because I obviously don't know what I am doing. (Sorry, I'm primarily a programmer, not a DBA) Can anyone help?
Thanks
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Apr 27, 2001
I have daily scheduled full backups of each database and log backups scheduled for every 2 hours. My question is should they be scheduled for overwriting or appending? I have always had them set as overwrite, but I don't know if that is correct? Any recommendations would be appreciated
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Jun 12, 2006
Has anyone seen this before?
Every Sunday morning (a different time each week) there is a full backup created for every database on the server. The backup is not a scheduled backup from any maintenance plan or SQL Agent job. The backup set is unrestorable and has a strange name in the format of 'DBNAME_00_12c95fb7_399d_41ce_9a0d_b5728b6a00ba_'
Because this backup is listed as the last full backup and will not restore, it is causing a problem with our disaster recovery plans as nothing will restore from this point forward to the next full backup.
Does anyone know how a backup record like this can get created, and/or how to find the source. The backups are listed in the backupsets table in msdb - are there other system tables that may hold some clues as to the source of these backups?
Any help or direction would be appreciated.
Thanks
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Oct 23, 2015
I make two full backups on Oct 1 and Oct 10. I want to restore the server to a state in Oct 5. So I just do as follows:
1.Perform a transaction log backup on the server on Oct 23. I have never backup transaction log in the past.
2. Restore the server with Oct 1 full backup with NORECOVERY option.
3.Try to restore to the point at Oct 5 12:00, with the transaction log.
But the restore fails and SQL Server said the transaction log does not contain the point. The point is too early. Why? Also my .LDF file is about 13G, but the transaction log backup is only 200MB. Why?
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Apr 30, 2008
In what scenario – diff and full backups have same size? My guess is excessive fragmentation, any thoughts?
------------------------
I think, therefore I am - Rene Descartes
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Jan 14, 2008
But i have one issue bothering me, it will be great if someone can help me out on this
1. I take full backup on Monday 8 pm which ends at 9.30 PM
2. Diff Backup starts at 10 PM every 2 hrs till Tuesday 7.59 PM
3. Transactional Log backup is happening every 10 min till tueday 7.59 PM
Now when i restore it in the same order i get error that Log in the set is too late to apply. I have recemmonded by team to stop log backup on the time they start full backups and take transactional log backup only after differentials are restored. Now is this a correct suggestion???
Also appendin the differential backup is a good idea or overwriting them is a better approach if Database is backedup every night and Differential occurs every 2 hrs.
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Mar 21, 2008
I am running a full backup quarterly using "with init" to overwrite the existing file if it is still on the server. Then I run a differential back weekly using "with init". Finally I run a transaction log backup nightly using "with init".
My question is should I be using "with init" for the transaction log backup or allow it to accumulate until the next differential backup?
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Mar 16, 2001
Hi All,
Is there a way to suppress or re-direct the messages that result from a tran. log dump? We're running a tran. log dump every 15 minutes in prod. and the errorlog is really cumbersome to look at.
(In another RDBMS I worked with all backup messages went to a separate error/message log.)
TIA!
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