Estimation Of Full Backup Size
Jun 28, 2006
Has anyone come across a more accurate method than sp_spaceused to estimate the size of a full database backup for SQL Server 2000 ?
I have found this to have too great a variance (even after running updateusage) to rely on any accuracy for it. I have also looked at perhaps using the ALLOCATED Pages indicated in the GAM pages but this also seems to be pretty inaccurate.
I have a number of servers where space can be limited and backups using Maintenance Plans have occasionally failed because they delete the old backups AFTER they do the latest one. I am writing a script which can check the space remaining and adjust the backup accordingly but the variance I have observed so far with sp_spaceused is too great.
Any ideas welcomed.
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Feb 7, 2000
Hi ,
I have a sample table with the following descriptions
CREATE TABLE "dbo"."tab1" (
"cola" "int" NOT NULL ,
"colb" varchar (30) NOT NULL ,
"colc" "int" NOT NULL ,
CONSTRAINT "PK___2__10" PRIMARY KEY CLUSTERED
(
"cola",
"colc"
)
)
GO
After adding some 100000 records to this table I run the sp_spaceused procedure and it give me the following information.
name - tab1
rows - 100000
reserved - 2122KB
data - 2084KB
index_size - 30KB
unused -8KB
Also i manullay calculated the number of datapages using the following equations which is available in the Sql server documentation.
Data row size = 8 ( Size of ffixed length columns) +
30 (Size of all variable length columns) +
1(Number of variable length columns ) +
7( over head)
= 46
Rows per page = (2032 -32)/46 = 43
32 - Page heade size
Number of data pages = 100000/43 = 2325 pages
= 2325 * 2 = 4650KB
Can any body tell me why there is a mismatch in result between the calculation?Am i wrong in some steps ? Is there any other way to estimate the size of table.Your valuable suggestions appreciated.
Regards
Jiji
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Jul 13, 2007
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
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Apr 16, 2008
In my enrv. DBA just migrated SQL Server 2000 Databases from WINDOWS 2000 to WINDOWS 2003 Enterprise Edition and the same SQL version. The problem which i need to analyse
1. Why the full backup size is occupying only 70GB when DB size is 120GB?
Here is the situation
Full Backup is taken once every day ---- 70gb
Diff Backup Taken every 3 hrs till 5 PM ----- size is 50GB
Transaction log backed up every 10 min uptill 8 PM ----- not a big size
I am really confused as to why Full DB Backup is taking only 70GB.............Can some one please throw a Light on how the SQL Server 2000 Backup functions.
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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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Aug 3, 2015
Need to restore database,here's the scenario:
Data got deleted on Friday evening, need to have database restored to FRiday afternoon and also some data has been entered on Monday, which needs to be there.
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Jul 15, 2015
We take a full backup in the early morning and hourly transaction log back during the working hours for one database in the production server. The application team made certain changes to the design of the said database in their development server. The backup from the development server was restored to the production server during working hours. After the restoration should we take a full backup before next transactional logbackup? Would the transactional log backup with out a full backup after the restoration of a database be valid?
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Nov 16, 2015
I have a database that is just over 1.5GB and the Full backup that is 13GB not sure how this is since we have compression on for full backups and my other full backups are much smaller than there respective databases...Now my full backup is taken every Sunday night and the differentials are taken every 6 hours after the full backup. Now I have been thrown into this DBA role with little to no experience just what I have picked up and read. So my understanding of backups are limited but what I think I understand is that we take a full backup and the differential only captures what changes in the database so my question is why is my database 1.5GB but my differential is 15.4GB? I have others database that are on the same instance and don't seem to have this problem. I also just noticed that we do not rebuild the index before a full backup like we do on other instances...
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Nov 29, 2007
If my backup starts at 8PM and take 1 hour to complete, will the changes made to the database during that hour be captured in the full backup?
Stated another way, will my backup be a snapshot of:
a) 8PM when the backup started
b) 8PM with some of the changes made between the hour
c) 9PM when the backup finished?
Anybody know the exact way SQL Server handles that logic?
Thanks,
Marc
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Jul 19, 2007
Hi
I am using the Simple recovery model and I'm taking a weekly full backup each Monday morning with differentials taken every 4 hours during the day.
On Wednesday afternoon, a programmer ran a process that corrupted the db and I had to restore to the most recent differential. It was 5pm in the afternoon and a differential backup had just occured at 4pm. No problem, I figured.
I restored the full backup from Monday morning and tried to restore the most recent differential backup. The differential restore failed. Since I had used T-SQL for the initial attempt, I tried using Enterprise Manager to try again.
When viewing the backup history, I see my initial full backup taken on Monday plus all the differentials. BUT, on closer inspection, I noticed another full backup in the backup history that was taken early Tuesday morning. I can't figure out where this Tuesday morning full backup came from. It wasn't taken by me (or scheduled by me) and I'm the only one with access to the server. My full backups are usually named something like HCMPRP_20070718_FULL.bak. This erroneous full backup was named something like HCMPRP_03a_361adk2k_dd53.bak. It seemed like it was a system generated name. Not something I would choose. To top it off, I could not find this backup file anywhere on the server and when I tried to restore using this full backup, it failed.
Does anyone have any clues as to where this full backup might come from? Does SQL Server trigger a full backup on its own if some threshold is reached?
I ended up having to restore using the differential taken just before this erroneous full backup and lost a day of transactions.
Any insight is greatly appreciated.
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Aug 8, 2007
Hello,
I have MS SQL 2005 server with 300+ databases on it. The application is set up that way that it creates a new database as needed (dynamically). Do not ask me why - I hate this design... So, it can create 3-4 databases a day (random time).
I've scheduled full backup of all databases to run once at night, and it runs just fine. Besides that, I have scheduled tran logs backup of all databases to run every hour. This backup fails from time to time with the following error:
Executing the query "BACKUP LOG [survey_p0886464_test] TO DISK = N'D:\backups\log backups\survey_p0886464_test_backup_200708072300.trn' WITH NOFORMAT, NOINIT, NAME = N'survey_p0886464_test_backup_20070807230002', SKIP, REWIND, NOUNLOAD, STATS = 10
" failed with the following error: "BACKUP LOG cannot be performed because there is no current database backup.
BACKUP LOG is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
So, I think what happens is since my full backup of all databases are scheduled to run only once at night, and tran logs every hour, when new database is created during the day, there is no full backup for it, that is why tran logs backup fails. Becuase after the failure, if I run full backup again, then tran log runs just fine afterwards.
I am new to MS SQL Server, I am mostly working with Sybase IQ. Do you know if I can "trigger" full backup every time when new database created to avoid tran lof failure?
Or is it possible to schedule full backup to run if tran log backup fails?
Any advice will be much appreciated.
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Oct 17, 2006
I have a full backup and several diff backup,now i want to restore
firstly,I restore full backup
RESTORE DATABASE ***
FROM DISK = 'D:databackup200610140000.bak'
WITH NORECOVERY
GO
it's working,then i don;'t know how to continue
Thanks in advance
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Mar 11, 2008
Hello, everyone:
I just heard that for restore purpose, ths full backup and transaction log backup should be from one maintenance plan. Otherwise transaction log backup files cannot be restored after restoring full backup files.
Is it true? Can anyone offer official documents?
In my system, full and transaction backups are from one maintenance plan. Restores are doing fine. I am not sure that ideal is true or not.
Thanks
ZYT
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Mar 15, 2007
If I create an adhoc db backup that takes, say 30 miuntes to complete, should I suspend the tran log backups that run every 10 minutes, until the full backup is complete?
Drew
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Jun 6, 2007
Hi,
Using SQL Server 2005, we have a 2.8Gb database under the Simple recovery model. The database contains ~50M rows and each night ~60k rows are loaded(appended) to the database by a SSIS task.
We configured a Maintenance Plan which is executed once a week to perform a full backup of the database. The resulting backup file is ~2.8Gb, as expected.
We also configured another Maintenance Plan which is executed every day, a few hours after the SSIS task is executed, to perform a differential backup. To our surprise, the resulting backup file is about the same size as the full backup, ~2.8Gb when it should only be a few MB (only 60k rows are added to the database)
When we launch the "Restore Database" wizzard we clearly see the different backup set, Full and Differential but they all have about the same size (same for the physical backup file on disk).
Is there anything we are missing, why are the differential backup that big?
Thanks for any advice.
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Jan 13, 2005
Hi,
Does anyone have experience with Full Text catalogs on large tables? We have a full text catalog on a table with about 30 million rows. Acording to BOL, once you get over 1 million you'll need to make some adjustements. Our system works, but we randomly get the following errors with ad hoc queries. The server has 8GB of RAM and 4 3GHz processors. Does anyone have experience working with a table this big? Any suggetions as to what could cause these errors? The only thing I could find was BUG#: 469483 on MS's site, but we're not using any OR clauses
Thanks
Here's the errors....
(query)
SELECT * FROM acc_results ar
WHERE CONTAINS(finding_text, 'cell')
#1
Server: Msg 7619, Level 16, State 1, Line 1
Execution of a full-text operation failed. Not enough storage is available to process this command.
#2
Server: Msg 7342, Level 16, State 1, Line 1
Unexpected NULL value returned for column '[FULLTEXT:acc_results].KEY' from the OLE DB provider 'Full-text Search Engine'. This column cannot be NULL.
OLE DB error trace [Non-interface error: Unexpected NULL value returned for the column: ProviderName='Full-text Search Engine', TableName='[FULLTEXT:acc_results]', ColumnName='KEY'].
#3
Server: Msg 7399, Level 16, State 1, Line 1
OLE DB provider 'Full-text Search Engine' reported an error.
[OLE/DB provider returned message: Not enough storage is available to process this command.]
OLE DB error trace [OLE/DB Provider 'Full-text Search Engine' IRowset::GetNextRows returned 0x80004005: ].
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Oct 11, 2007
The Upgrade Advisor noted that SQL Server 2005 changed the way full text catalogs are utilized. It says that you must ensure tha tthe file group associated with the base table has enough space to accomodate the additional space requirements for full-text indexes. It says to use the formula (2*FTK + 34 bytes) * RC where FTK=full text key size and RC=rowcount of the table. I know which table but if I do sp_help on the table, it doesn't tell me anything about the size of the full text key. I've tried searching TechNet and I'm either not finding the answer or I don't know enough to know if it's there. Can anybody help me?
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Jan 2, 2008
Dear Experts,
i'm going to create a new database for the client, the initial size might be 10GB. so please guide me what will be datafile size and log file size?
i'm not creating secondary datafiles. is it ok?
Vinod
Even you learn 1%, Learn it with 100% confidence.
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Dec 19, 2001
Is there a quick easy way to calculate rowsize for a record in a table that has data in each column?
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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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Nov 16, 2007
I'm new to the DBA world, and have no one else in the company to look up to. Does anyone know what I might need to check out or do when the Data File Size is 204% full? Or is this not necessarily a bad thing?
I'm getting this from a Diagnostic tool I have.
The number of tables is 148
Data file size 35,941 MB
Data Size 26,549.92 MB
Index Size 177,130.02 MB
Log File Size 5.05 MB
Thanks,
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Oct 23, 2015
In SQL Server, whether the full backup of a database includes the backup of the log?
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Jun 14, 2007
Hi:
I have 30 databases on sql server 2005 that I need to do a full backup every morning at 7:00 and tran log backup every 30 minutes until 7:00 PM. If I create a maintenance plan for a backup using the wizard I have the option of starting a full backup at 7 am and then an option of doing tran log backups every hour using a different schedule. I plan on selecting the option to create a different folder for every database. I just need to confirm that in this way the way to restore the data would be
1. to restore a full backup
2. apply all the tran logs depending on the time they want to recover back to.
I just think this is the easiest approach to have 30 databases on the same backup scheme instead of creating a separate backup device for each database and doing a full backup on that device and appending all tran logs to that device which means just 1 bak file versus the above strategy with a number of tran log files. Please advise.
Thanks
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Sep 1, 2006
HiI have trouble with MSSQL2000 SP4 (without any hotfixes). During last twoweeks it start works anormally. After last optimalization (about few monthsago) it works good (fast, without blocks). Its buffer cache hit ratio wasabout 99.7-99.8. Last day it starts work slow, there was many blocks anddedlocks. There are no any queries, jobs and applications was added. Nowbuffer cache hit ratio oscilate about 95-98. I try update statistics andreindex some hard used tables, but there is no effect or effect is weryshort (after few hours problem return).Mayby somene know what it could be?Is it possible to estimate how each table (using DBCC SHOW_STATISTICS orDBCC SHOWCONTIG or others) how the table affect on total buffer cache hitratio?Marek---www.programowanieobiektowe.pl
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Mar 28, 2007
Dear forum users,
I am a newbie in using MS SQL server with analysis services.
There seems to be no 'cross-validation' tool in MS SQL
which is frequently used in data mining and even statistics.
Is there anyone having similar difficulties?
Is there any solution like a small scripts to divide
the given dataset with multiple folds?
Your valuable comments and feedbacks would be appreciated.
Minnetongka
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Oct 30, 2007
Why is it that lately our full backup (.bak) file size is more than 2x the size of the actual database file size (.mdb)?
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Jul 20, 2005
I start a full backup on a database at 5pm. The backup job takes 3hours to complete. While the backup job is running, someone insertsrecords to the db. Will the backup include the new records? Or inother words, are the contents of a SQL Server backup a snapshot of thedatabase at the start time of the backup?
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Feb 13, 2008
My database is of 10 gb, when backup is taken the size of .bak file is less than 10 gb.
Why?
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Apr 15, 2008
I have a log file that is approximately 50 GIG. I backed up just the log and the file size of the .bak is 192 GIG . Why is this? Shouldn't it be closer to the 50 GIG.
Normally I wouldn't let log grow this much. But we are in process of getting new server up and running and don't have backups going yet. They are working on getting that up and running this week.
So I did a log backup to give me back some log space for now but was concerned when I saw the size of the .bak file.
When I view media contents of the backup device it shows one tranaction log back up and size of 192 GIG.
What is up with this. I know in SQL 2000 the log backup files where never this big. they were about the size of the log itself.
Any ideas?
Stacy
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Dec 10, 2007
I have a scheduled job backup/maintenance plan. In it I told it to delete all logs older than one day.
Does that mean it delete logs for every job or just that job? I ask because for some reason all the logs on every job is being truncated down to one day.
Thanks
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Feb 23, 2015
We need to setup an AO availability Group for a database for which a full backup exists but the DB is in simple recovery mode now. If i change the recovery mode to full and try to configure AG will this full backup will be used or do i need to create a new full backup.
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Jul 20, 2005
If a full backup kicks off at 6pm within SQL Server, and takes 2 hoursto complete, will transactions between 6pm and 8pm be included in thebackup?Tks
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Jul 20, 2005
Question 13 GHZ CPU (Intel pentium 4) single cpu + 2 GB Memory + SCSI HDDDatabase size 10 GB - How long will full database backup take if thebackup is writing a file to the hard disk (separate hard disk)Question 2during this full backup are users and application able to access thedatabasefor examplea) select recordsb) insert , update, delete recordsor is the database backup causing the database to be exclusivelylocked up ?Thanks in advance
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