Sql Server Filegroups And Files
Feb 29, 2008
i am not new to sql server but never think of how it work from the inside, but now i do :)
what i need to know and discuss her is how sql server work with filegroups and file inside the filegroup.
what i need to know exactly us that if i have multiple files within a file group how sql work and how object saved to this filegroup?
will sql server save all object data at the same file in the file group or the object data will be saved in multiple files in the file group?
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Mar 23, 2015
What is the best method to restore a DBTest1 (with one .mdf and one .ldf) into DBTest2 (with one .mdf, multiple .ndf data files and with 4 filegroups associated with specific data files). I do not see how the one .mdf file (in DBTest1) can be separated into the other 4 filegroups (in DBTest2). This does not sounds like it is possible with Backup DBTest1/Restore to DBTEST2 or (Detach/Attach) because the underlying filegroup and file structure is different.
What method should be used to get the data and structure from DBTest1 (includes 1100 Tables and 550 GBs of Data) into DBTest2 (with 4 filegroups)? Is the following possible:
1) First, in DBTest2, execute a script to create tables/indexes on appropriate filegroups.
2) In DBTest2, use scripts to pull data from DBTest1 into DBTest2, for example INSERT INTO DBTest2.dbo.tables with SELECT FROM DBTest1.dbo.tables OR use SELECT/INTO DBTest2.dbo.tables FROM DBTest1.dbo.tables.
Or, is it possible to use the BULK INSERT or BULK COPY Options? Export/Import Wizard?
Does the Create Index step needs to be done after the data is loaded into DBTest2?
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Sep 10, 1999
I was under the impression that if you are using multiple files in your filegroup to store your data that the data should be written evenly across the files.
I have 5 files and the data is being written to only one file which is growing rather large, while the other files are still at 5 - 7 MB. They are all marked for Automatic Growth at this point, but only the 1 file is growing.
Is there something else that needs to be done to enable this? BOL left me with the impression that this is automatic.
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Oct 12, 2007
Hey guys I have a VLDB and I would like to point or move several tables to another filegroup.
1). Add a filegroup to the database
ALTER DATABASE dbname
ADD FILEGROUP filename_table
go
2). Add a file to the file group
ALTER DATABASE dbname
ADD FILE
.....
TO FILEGROUP filename_table
go
If a table is already part of the primary filegroup:
Can I change it to another filegroup?
When changed to the another filegroup will it move the whole table to the other filegroup or just start to write data to the newly created filegroup?
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Sep 26, 2000
hi
To restore files and filegroups in a different server. First, Do i have to create the database with same name as the old one? or it doesn't matter... Can we use Enterprise Manager to do this restore?
Thanks in advance
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Feb 9, 2006
hi all,
i have a problem with creating filegroups in sql server...i just want to copy the names of the columns from one table into my filegroups...
this is my problem : i m writting the following code in tsql:
SELECT * INTO Sales FROM Sales1 WHERE 0=1 ON [MyFG1]
Can anyone please help meeee???? i'd like it to work this way, to copy only first column names from Sales1 to Sales but in this filegroup.
if this is not the write way...then can anyone please tell me the right syntax and the way to copy just the names into a filegroup?????
thanx in advance.
Regards.
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Sep 3, 2007
Hi gurus,
I've created a linked server (and set up the corresponding schema.ini file) in order to perform bulk-inserts from some CSV text files into SQL tables (from my standpoint the text files are just for reading purposes). The linked server works fine (I can select the data in the files without a problem).
Now the question: is possible to automatically detect when one or more of those files change in order to start the import process automatically? Something like having a trigger created on the CSV files Or there's no easy way to do that so I have, to say something, to create a Job that periodically checks if the files have changed programatically (say, recording each file's timestamp everytime is imported and comparing the recorded value with the current one, or whatever)?
Thanks a lot in advance!
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Jan 9, 2015
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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Feb 24, 2015
I have the need to delete old backup files via TSQL job. Found this solution online:
PushD "
emoteservershareDIFF" &&(
forfiles -m *DIFF*.sqb -d -1 -c "cmd /c del /q @path"
) & PopD
It works remotely if I run it via command prompt. But when I add this to a TSQL job on my remote SQL instance, it runs without deleting anything. What I'm missing?
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May 25, 2000
I was told to move tables to new filegroups by placing the clustered index on the filegroup and the table would
follow. There are times when I see tables listed on the new filegroup but still listed also on Primary. My goal is
to have only system tables on Primary. How can I get a table to totally leave the PRIMARY group?
There seems to be a system index on the table that was not created by me.
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Jan 23, 2001
I have databse that was created when I got here and the database was created with 3 file groups. The tables in the database are spread out over the 3 file groups.
How can I find out which table belongs to which file group.
Thank You,
John
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Oct 8, 1999
If I'm running RAID 5, is it still good practice to split system and user data onto separate filegroups ? .....
On separate disks ?
Thanks in advance..
Any comments welcome ! Peter
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Oct 8, 1999
If I'm running RAID 5, is it still good practice to split system and user data onto separate filegroups ? .....On separate disks ? Thanks in advance..
Any comments welcome ! Peter
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Feb 8, 2006
Hi,
I was wondering if there is a downside of placing individual tables into their own filegroup (i.e., 1:1). This would seem to allow me to continue to backup entire databases but give me the flexibility to restore at a table level if necessary. I ask this because the number of filegroups allowed per database has increased from 256 in SS2000 to 32K in SS2005. What kind of headaches could I get into if I follow this type of design ?
Thanks,
Mario
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Sep 22, 2005
i want to obtain information about all the filegroups for every database. is there a special command to obtain this information like the dbcc sqlper or something similar ??
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Oct 8, 2007
hi all,
What is the purpose of files?(primary secondary,transaction log ). what is the use of these files?
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Jul 21, 2000
Is there a way to list all the tables in each of the filegroup
in a database. I have a database with 7 filegroups and would like
to have a list of tables in each filegroup
Sp_helpfilegroup gives you list of filegroups and the names of files
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Jan 23, 2001
Is there any way in which I can move an objects/ data to another
filegroup using transact sql?
I have created a table such that the data is on a secondary filegroup.
But the table has image and text data and this data is going to
the PRIMARY filegroup.
I tried chnging the filegroup for the text data but this property but does not change(I did it through EM).
As a result, the disk which contains the primary filegroup is getting filled up.
I have configured my database such that the primary file group is on one disk and the secondary on another and the log on the same disk as the primary filegroup.
I have given lesser space to the primary file group and more space to the secondary filegroup.
help on this is greatly appreciated because my system is rapidly growing with respect to data.
thanks and best regards
Sush.
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Sep 14, 2006
We are going to start using fielgroups to move some indexes to a different RAID. Simple ? is, when you do a full database backup, that backup alss contains the new filegroup?
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Jul 18, 2007
Hello everyone -
Currently the setup is a single filegroup sql machine
with each company as a new database in a single system.
Would breaking the companies into thier own filegroups
be benefitial?
or perhaps creating a instance of SQL for each company be a better approach?
thoughts / ideas would be appreciated
thanks
tony
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May 19, 2004
I'm fishing for some advice here.
I'm porting an old Access 97 application to SQL Server 2000. The Access app uses 9 separate files for a series of linked tables (one table in each file to get around the 1Gb Access file size limit). The tables vary in size form 2Mb to 800Mb so the whole data set weighs in at around 6Gb.
I've prepared tables for the data in SQL Server and assigned each table into its own filegroup each of whihc has its own file so I can separate the data out and also keep an eye on the amount of data.
My next problem is the indexes. The Access tables don't have primary keys. My SQL tables do (Large Integers) but each table is mainly indexed on an account number which is an 11 char alphanumeric. This is non unique so I can't use it as a primary key.
At present I have all the table indexes in the PRIMARY filegroup (which in tunr just has the default MDF file in it)
I've built a small version of the DB for testing various triggers and new views and the DTS import packages and the indexing for the 300Mb of data I have now is obviously fairly quick. I am wondering if I should split the indexes out into each of the separate MDF files that I am storing the table data or should I split the indexes into their own files?
I want this thing to be fast. The VBA app that will be plugging into the DB has a huge amount of code and currently struggles especially when several dozen people are all connected to the same tables.
So any advice? Indexes in separate files? Or in with the data? or all together in one index file? Any performance impacts I should be aware of?
The DB is running on its own dedicated box. Its not huge 1Gb Ram, 30Gb drive and a 3Ghz P4. But given that it isn't running anything else it should be up to the job. It should certainly be faster than the current shared drive that the access app runs from.
many thanks
Steve
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Jul 23, 2005
I'm trying to tweak our DB as much as I can. We have the full applicationdatabase sitting on a RAID 10. Logs, tempdb, etc.. are on separate arrays.I read some articles about making separate filegroups. Of course, they allsay to move them to different arrays, which because of budget is notpossible right now. I also read articles that say to put large tables in afilegroup then add another data file to the group. This allows SQL Serverto use multiple threads to access the tables. Therefore, to my question.If I split our database up into multipele file groups on the same array,could I see a performance gain. Would the database be able to issuedifferent threads for each group when a query is run and improve overallperformance.Thank you,Adam
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Apr 19, 2006
Hi
We can create a queue on a filegroup for performance reasons however what about the sys.transmission_queue which could have messages backing up when the target is down.
What are your thoughts.
Cheers
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May 7, 2008
Hi Guys,
I need some help for my Log Shipping database please.
I have a database X on the production server and on the log shipping standby server (Read-only). The logs on the production server is shipped to the standby server. The standby server restores the logs through a schedule job.
Now what happended is couple of days back we created another filegroup (Secondary) on the production server for the database X to keep our history separated from the most current data. When we created the secondary filegroup our logs on the log shipping server cannot restored. We investigate the problem and found that there is no secondary filegroup attached to our database X on the log shipping server, which is obvious.
My question now is there a way we can create a secondary filegroup for the database X on the log shipping server without breaking our existing log shipping? Do we must restore the full backup of the database X on the log shipping server in order to keep the transaction logs applied on the log shipping database X?
Please help.
Thanks.
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Jun 18, 2002
I want to change the filegroup of a table. While we can do this in enterprise mgr, I would like to accomplish this in transact sql. We have a new configuration where the filegroups are located on different disks and to take advantage of that, I want to move the heavily accessed tables onto different groups. Example: table emp needs to be moved from filegroup Primary to file group Secondary.
please help...
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Aug 25, 2000
I am trying to restore from a backup of an individual filegroup in SQL Server 7.0. I have backed up the individual filegroups, and I want to restore one of them (not the whole database). The process in EM is almost the same as restoring the entire database, only you choose the radio button 'Filegroups' and the files/filegroups you want to restore.
The restoration appears to complete sucessfully, but afterward, my database seems to be permanently loading. In other words, in EM the database is greyed out and you cannot use it anymore. It stays like this until you drop the database altogether. Is this a bug? Has anyone else had this problem or does anyone have experience restoring from filegroups sucessfully???
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May 3, 2007
Howdy all. I want to be able to restore just 1 filegroup from a filegroup backup, without having to restore the log afterwords even if the data has changed post filegroup backup. While this would leave the data inconsistant, it may be desired at times. From BOL: ms-help://MS.SQLCC.v9/MS.SQLSVR.v9.en/udb9/html/2f552700-efb3-48f1-b96d-c073049100f0.htm
************************************************** ******
If the files have been modified after the file backup was created, execute the RESTORE LOG statement to apply the transaction log backup, specifying:
The name of the database to which the transaction log will be applied.
The backup device from where the transaction log backup will be restored.
The NORECOVERY clause if you have another transaction log backup to apply after the current one; otherwise, specify the RECOVERY clause.
The transaction log backups, if applied, must cover the time when the files and filegroups were backed up until the end of log (unless ALL database files are restored).
************************************************** ******
But thats just it, I may not want to take this action. Maybe some data got deleted from a set of tables in a filegroup right after I took my last filegroup backup, so I just want to restore that filegroup back to that backup, but leave my other filegroups alone. Restoring the log brings the data back to a consistant state when the log was backed up, which may not be what I want.
Can this be accomplished?
TIA, cfr
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Apr 19, 2004
Hi,
I want to take the backup of a particular filegroup in SQL server 2000 and then restore the same filegroup backup.
Currently I am using the following steps :
1. Creating the database with 2 filegroups. The syntax that I used for it is as follows :
create database test
on primary
(name = test1,
filename = 'D:Program FilesMicrosoft SQL ServerMSSQLData est1.mdf'),
(name = test2,
filename = 'D:Program FilesMicrosoft SQL ServerMSSQLData est2.ndf'),
filegroup group2
(name = test3,
filename = 'D:Program FilesMicrosoft SQL ServerMSSQLData est3.ndf'),
(name = test4,
filename = 'D:Program FilesMicrosoft SQL ServerMSSQLData est4.ndf')
log on
(name = test_log,
filename = 'D:Program FilesMicrosoft SQL ServerMSSQLData est_log.ldf')
2. Now I am creating two tables table1 and table2 using Enterprise Manager. Both the Tables, table1 and table2 are on the "Group2" Filegroup of test database.
3. After creating the tables, I inserted three records in each table.
4. Then I performed the backup using the following commands:
backup log test
to disk = 'e: est.lg1' with init
backup database test
filegroup = 'group2'
to disk = 'e: est_group2.bak'
5. After the backup has been taken, I deleted the two records from both the tables. Now both my tables have one record each.
6. Now I tried restoring the database using following command :
backup log test
to disk = 'e: est.lg3' with init
restore database test
filegroup = 'group2'
from disk = 'e: est_group2.bak'
with norecovery
restore log test
from disk = 'e: est.lg3' with norecovery
restore database test
with recovery
7. After all these commands are executed, when i checked my database, it contains again the one record in each table. Ideally, according to me the tables should contain 3 records as i had taken the backup when each table had 3 records.
How can I bring the database back to the state in which I had taken the backup.
Pls. help me as soon as possible.
And also let me know, if I need to do any SQL level or Database level settings for the above task.
Waiting for your reply. and thanking you in advance.
Regards,
a_k93
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Apr 2, 2008
CREATE DATABASE Dummy
ON
PRIMARY (
NAME = PrimaryLog,
FILENAME = 'D:primary.mdf',
SIZE = 5MB,
MAXSIZE = 500MB,
FILEGROWTH = 20MB ),
(
NAME = Data,
FILENAME = 'D:Data.ndf',
SIZE = 5MB,
MAXSIZE = 500MB,
FILEGROWTH = 20MB ),
LOG ON
-- Stores The Log Information used To Recover The Database
(
NAME = Log,
FILENAME = 'D:Log.ldf',
SIZE = 5MB,
MAXSIZE = 500MB,
FILEGROWTH = 20MB )
Go
After this I want to create table on Data .
CREATE TABLE Sample (
No INT ,Name VARCHAR(30) , Department VARCHAR(4000) NULL
)
ON Data
GO
it shows invalid filegroup DATA specified
what may be wrong
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Jul 5, 2007
Does anyone know how to move tables between filegroups in 2005?
Cogito ergo spam -- I'm pink therefore I'm Spam
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Aug 29, 2007
Hi
Background:
My company is in the process of upgrading our sql 2000 server to 2005 on new server hardware. In this process I'm charged with the actual server and database configuration on the new server so currently I'm investigating how to take advantage of new 2005 features and improve the use of common features on both platforms. We've decided to perform this upgrade in three stages (won't bother you with why) and the first stage is to install the new server with a 2000 installation with a different configuration regarding files/filegroups on the new hardware configuration that has a different raid configuration. The old server configuration was lacking in just about every department so I'm serious about getting it right this time. Its an OLTP system btw.
The question(s):
The 2780A course book states that sql 2005 can perform the following scans: "Multiple parallell scans for a single table if the filegroup of the table contains multiple files." Does this imply that the files must be on separate disks/raid channels? Ie, if I put all files in the filegroup on the same RAID 10 channel will I gain nothing over having just one file?
Can 2000 take advantage somehow of several files in a filegroup to achieve greater parallellism or is there no (end user) performance oriented reason to have more files in a filegroup? (Disregarding any impact of different backup strategies for several files).
I'm intending to place all nonclustered indexes in a separate filegroup with all files assigned to a dedicated RAID 0 channel for striping. Due to the lack of fault tolerance here I'm wondering if this is wise. But since nonclustered indexes are basically secondary metadatastructures and doesn't contain any data I'm wondering wether the server can disregard using an index when executing a query if the index resides on disk which have failed and the index is inaccessible. Is there a fallback option available to the server to perform a table scan or use another index instead?
Basically the same question can be asked for tempdb, use a RAID 10 with four disks or dare I use a RAID 0 with four disks (since 2005 use tempdb more heavily than 2000).
Also considering to put the OS on a dedicated RAID 1 and a dedicated RAID 0 for the pagefile, same concerns apply.
I appreciate any input, also examples (or links) or your experiences of good RAIDing practices for OLTP systems.
Thanks for your time.
PS. Sorry for posting this in both 2000 and 2005 forums but I don't wanna miss out on any good answers. ^^
/Timo
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Jul 20, 2005
Hi,I'm a newbie in this SQL Server development. I have a database with 7tables that are linked to each other and have created clustered indexfor the primary keys and non-clustered index for the secondary keys.All my indexes are on the same filegroup, what is the effect of thisbecuase the application that I'm using runs very slow duringprocessing.PS: My tables have a grown rate of about 10 000 records a day.
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Dec 6, 2005
Hey all
For performance reasons i want to move the Merge Replication tables in a DB of mine (mainly MSMerge_Tomestone and MSMerge_Contents) to a seperate filegroup ... it's a heavy transactional DB and the index fragamentation rate is quite phenominal!
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