How Data/log Files Grow

Dec 4, 2007

Hi All
i am bit confused about how data and log files grow in databases. suppose i turn off the auto grow and restrict the maxsize upto some limit but size of data/log file is less then maxsize at some stage because what i understand is size of data/log file keep changing depends upon the activities going on the database. in future if data/log file need to grow can it grow upto the maxsize without turing on the auto grow.

regards

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SQL Server Admin 2014 :: How Do Physical Data Files Grow When Rebuilding Indexes

Feb 2, 2015

I've been trying to get a definitive answer to this question but alas I have conflicting and patchy answers so far from other sources. I have an index that, lets say, requires 10GB of data space to rebuild..This index resides on a filegroup that spans 2 files on two seperate drives (i.e. a mdf and ndf)

When I rebuild this index how will each of these datafiles grow as the rebuild proceeds to completion? Lets for the time being remove the caveats of any other activity hitting the example index/database in question.My tests seem to show that only the mdf will grows (or the file with the lowest id in the that filegroup) provided there is enough space available in that particular file to complete the operation. The secondary ndf dat file doesnt grow at all if the mdf has enough space.

Is expected behavior? i.e. the index will be rebuilt in a contiguous manner relative to the files contained with the filegroup i.e. fileid 1 will grow till limit reached then next fileid grows etc?

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I've been through the forum and read a number of threads on people's DBs not growing and the answer usually is they don't have auotmatically grow data file. Unfortunately I have this on, but when I look at the properties of the database it reports the space available is 0.00 MB? Up until about two weeks ago I was showing appx 48% space utilization. When I ran an SP to show growth, it tells me that it was expanded by 20% yesterday, but SQL Server is still telling me the space available is zero.

The log file is also set for auto growth. The DB is 14.5 GB in size and the drives still have around 92 GB of space.

Has anyone experienced this before? Any ideas? Does anyone know of an SPs that can give me detailed info on internal data file size compared to stated size (i.e. wasted space in data file)? Is SQL Server doing something funny in the way it is seeing the database or data files individually? Any help is appreciated.

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SET NOCOUNT ON;
DECLARE @TempDB TABLE (FileID tinyint, name varchar(50), size bigint)
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[code]....

ENDThe code runs fine, but doesn't actually increase the size of the file.

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HELP-Create Sample Data By Microsofst Spoil And Grow My Mdf Ldf -from 5 MB TO 6 GB

May 21, 2008

help i run this
from this link
http://code.msdn.microsoft.com/SQLExamples/Wiki/View.aspx?title=NumbersTable&referringTitle=Home
and it stuck my sql server!!!!!

and after i run this
my my mdf ldf is 6 GB




Code Snippet-- Suppress data loading messages
SET NOCOUNT ON

-- Create Sample Data using a Table Varable
SELECT TOP 2147483647 IDENTITY(INT,0,1) AS N
INTO Numbers
FROM sysobjects a, sysobjects b, sysobjects c, sysobjects d, sysobjects e


before i was 6 mb
help
now how to fix this problem and shrinking my data



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I proposed on a new server that we separate Data Files, Log Files, tempDB, Backups, etc. onto separate LUNS on a SAN with High Speed Solid State Drives.I was told that with the new technology with solid state SAN's that it would decrease performance and that it did not work the same way as it did when you had RAID 5's etc.I thought that if things were cared out correctly by a SAN Administrator they would know how to configure for optimal performance.

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Jul 20, 2005

Greetings,The following shows how the Properties of a database look like:Data Files:File Name: student_datLocation: e:dataMSSQLDatastudent.mdfSpace allocated (MB): 62'Automatically grow file' checkedFile growth: 'By percent 10%' checkedMaximum file size: 'Unrestricted file growth' checkedTransaction Log:File Name: student_logLocation: e:dataMSSQLDatastudent.ldfSpace allocated (MB): 52'Automatically grow file' checkedFile growth: 'By percent 10%' checkedMaximum file size: 'Unrestricted file growth' checkedThe physical files look like this:Name Size Type Modified------------------------------------------------student.ldf 52,416 KB Database File 2/11/2004 10:34PMstudent.mdf 63,424 KB Database File 2/11/2004 10:34PMMy question is now that it has been specified 'Unrestricted file growth'for both the data and the log file, why both haven't increased any insize since 2/11/2004? Actually, the modified timestamps of some otherdatabases files are also '2/11/2004 10:34PM'. That's weird.I found the following message that's relevent to the above timestamp inthe SQL Server Logs:=====2004-02-11 22:34:10.12 server SQL Server terminating because ofsystem shutdown.=====I'm pretty sure there have been a lot updates taking place on thisdatabase. We don't hear any complaints from the customers that theyhave had any problems (such as, no space left) with the databases.Did the SQL server write the data and log somewhere else?Any insight on what's going on would be appreciated.Bing

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Sep 17, 2004

Hi!
I'm using replication with two database on SQL 2000,when begin, the log files size is 50mb and the data files size is 150mb. But now the log files size is 2Gb and the data files size is 4Gb. I would like to decrease the log files and the data files ??? How do i do this???
(I using Truncate and shrink doesn't change )
Thanks!!!

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Hi,

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Jun 27, 2007

Bear with me - My SQL Server 2005 Maintenance is as good as a Newbie..

I was running a Very Large Transaction over the weekend (Say 10Mill Inserts)..
And after waiting for 3/4 Hrs for the transaction to complete -- Checked the LDF File, I has grown to a 100 GB.

After that i discovered that i had the Recovery Model as FULL .. So Killed the Job and Changed the recovery mode from Full -> Simple.

Now i see that the LDF file is not growing in size even though there are many transactions that were complete successfully (Still Very slow though)...

What am i missing here - Iam clueless as to why my LDF is not growing in size?

Any Ideas??

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Hi ,
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Thanks
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Jan 13, 1999

OK. Here's a good one.

I wrote a query that caused a HUGE amount of stuff to be written to the transaction log. Since I set the database up before I had enough coffee yesterday, I didn't turn on a "Restrict Filegrowth" on the log. So the transaction ran until it filled up the available space on the drive (my local workstation, so it grew to about 6 GB) and then it rolled back. (BTW: Microsoft finally figured out that rolling back a transaction shouldn't be a blocking operation. ISQLW tells you that the transaction failed as soon as it fails, and then releases the connection to you, so you can go on with your life while SQL Server cleans up. Good one!)

OK. So that done, I figured I'd just truncate the transaction log and do the nifty new "DBCC SHRINKFILE()" thing. So I truncate the log and do DBCC SHRINKFILE. Nothing happens. Enterprise Mangler (OOPS Manager. I really mean Manager) shows that only 43 MB of the 6 GB file is in use. DBCC SHRINKFILE reports that the minimum size is 128 pages, the current size is 697,256 pages, and 697,256 pages are used.

Great. So I can't shrink the file.

Step 2: I dump (OOPS, sorry, BACKUP) the database, delete the database, make sure all the files are gone, and then restore the database. It re-creates the 6 GB file, which, by the way takes a very long time. What's funny about that is the query timer in ISQLW reports that the query took 30 minutes, but the return from the restore command shows that it took about 300 and some seconds (about 5 minutes) because the restore command doesn't count the amount of time it took to build the files (I'm guessing). After I figure out that it rebuilt the 6 GB file, I screamed, and started downloading PostGreSQL for my Linux box, and got on to other projects.

This morning I came in and started reading Books Online to figure out what's going on. It says something about "Virtual Log Files" and how a log can't be shrunk past that point. Great. MS basically defines a virtual log file as "the point past which you can't shrink a log". So I have a 5 GB virutal log file, and I can't truncate it, shrink it, or make it go away.

So I have a stroke of genius and decide to build a new log file in the database, and then use the DBCC SHRINKFILE command with the EMPTYFILE option, and then use ALTER DATABASE to remove the file.

Then I get this really cool error that says:
Server: Msg 5020, Level 16, State 1, Line 1
The primary data or log file cannot be removed from a database.

OK. Last time I checked, a log file doesn't belong to a primary filegroup, so there's something else going on here. Basically, it looks like the first file that gets created is the "Primary" file and can never be removed.

So, new policy, every "first" file in a database is going to be a 2 MB file, with a 2 MB growth limit, so we can remove it later. That's a load of....fertilizer.

It looks like the AutoShrink for logs is just a myth. Auto-Grow seems to work almost too well, though. I'm picturing one of those Access newbies using the Export function in Access to put data into SQL Server on one of our pre-production boxes, and having a 180 GB log that can't be shrunk. That'll be a good time.

The moral of the story: Always set growth restrictions, especially on log files.

The questions:
1. Anybody got any bright ideas on how I can get my disk space back WITHOUT using BCP (or DTS, or similar methods)?

2. Anybody know how a different file can be set as a "PRIMARY" file?

3. Anybody know why MS decided to fill the Transact-SQL help in ISQLW with "You can't get there from here" messages that reference Books Online?

Thankfully, this isn't anywhere in our production system, and if the quality continues this way, it won't ever be in our production system.

chris.

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Jan 24, 2003

Hardware:
IBM Netfinity 8500
2 processors Xeon 700
1,5 Gb memory
Windows 2000 Server SP2 Build 2195
SQL Server 2000 Standard Edition 8.00.534 SP2
There is only on Database (DB) of 16 Gb in drive G.
Drive G has 32 Gb space free.
Yesterday we appended tables to the database and in SQL logs appears the next error:

2003-01-23 12:26:42.57 spid101 fcb::ZeroFile(): GetOverLappedResult() failed with error 2.
2003-01-23 12:26:42.61 spid101 Error: 1105, Severity: 17, State: 2
2003-01-23 12:26:42.61 spid101 Could not allocate space for object 'ttdssc030104' in database 'MYDATABASE' because the 'PRIMARY' filegroup is full..
2003-01-23 12:26:48.03 spid101 fcb::ZeroFile(): GetOverLappedResult() failed with error 2.

DB configured to grow automatically by 100 Mb and transaction log Automatically grow in 10% .
Unrestricted file grow selected on both.

I try to expand the DB manually by Enterprise Manager to 20 Gb but not work and in SQL log appears the error

"2003-01-23 12:26:48.03 spid101 fcb::ZeroFile(): GetOverLappedResult() failed with error 2."

In Enterprise Manager-Databases-Properties-General-Size of DB maintain 16Gb.
Windows explorer say MYDATABASE.MDB is 20480 MB.

I delete the tables inserted and the problem persist.

Thanks in advance,

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Jan 8, 2004

Hello everyone,
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database grown from 33GB to 45 GB for 1 year period
4-5 times a year massive insert
done to database(no specific dates)

if I change autogrow to by 300MB or 4%

1.how would it affect insert process ?
2.how it affect daily performance ?

Thank you
Alex

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Hello,

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Thanks.

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Thanks very much!!!

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Thanks,
BCB

This is the style that is generated for one of the fixed header columns:

.a6
{overflow:hidden;
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WIDTH:100%;
font-style:Normal;
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font-size:8pt;
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