File Groups
Jun 26, 2006
Hi everyone,
While creating our database in only one disc(C or D), suppose that we create more than one file group in order to group our data files. However, in this situation; I wonder that whether it brings any benefit or advantage to us.
Also, I wonder that why we always have to put our data file into separate file group if we use separate discs for data files. Is not it allowed to use only one file group even if we use separate dics ?
Would you explain these to me ?
Thanks
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Dec 18, 2006
I have one of our production Accounting Databases starting from 2 GBnow grown into a 20 GB Database over the period of a few years...I have been getting timeouts when transactions are trying to updatedifferent tables in the database.. Most of the error I get are I/Orequests to the data file (Data file of the production dbAccounting_Data.MDF).I would like to implement the following to this Accounting database.I need to split the Data file into multiple files by placing some ofthe tables in different file groups. I have the server upgraded to beable to have different drives in different channels. I can place thesedata and log files in different drives so it will be less I/Oconflicts..I would like to have the following file groups..FileGroup 1 - which will have all database definitions (DDL).FileGroup 2 - I will have the AR Module tables under here..FileGroup 3 - I will have the GL module tables under here..FileGroup 4 - I will have the rest of the tables under hereFileGroup 5 - I will like to place the indexes under here....Also where will the associated transaction files go?I would like to get some help doing this. Is there any articles / helpavailable that I can refer to. Any suggestions / corrections/criticisms to what I have mentioned above is much appreciated...!Thanks in advance....
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Jan 8, 2001
If you have a SAN, is there any real benefit to breaking out large tables into file groups?
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Nov 3, 2007
I am looking to find out when to use file groups when backing up. When should you use this, what's the benefit over just doing a full db backup? Is it better when you are dealing with large db's?
Also this question has been on my mind for a while. Why shouldn't you shrink the db after every full backup? What is the negative in doing so?
Thanks
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Jun 28, 2006
Hi everyone,
When I do the following, did I put the files in Test1FG1 file group to the default file group(Primary) ?
ALTER DATABASE Test1
MODIFY FILEGROUP Test1FG1 DEFAULT
GO
Thanks
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Aug 17, 2000
I had a database that’s comprised of different file groups and log files spread out among different hard drives. I have recently upgraded the database to SQL 7.0 on a RAID 10 volume. I would like to consolidate all the file groups and files as well as various log files into one primary datafile and logfile. How do I do that? Thanks in advance.
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Jul 20, 2004
How to list all the file groups
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May 6, 2004
I am currently converting some Oracle scripts to SQL Server. Encountered this following code segment in a CREATE TABLE query :
CONSTRAINT ck_PK PRIMARY KEY ( O_ID) USING INDEX TABLESPACE DIRECT PCTFREE 10 STORAGE ( INITIAL 65536)) TABLESPACE DIRECT PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 STORAGE ( INITIAL 65536 MINEXTENTS 1 MAXEXTENTS 2147483645 FREELISTS 1 FREELIST GROUPS 1)
what is the equivalent conversion in SQL Server. Is it just ON PRIMARY in the PRIMARY KEY clause ?? Are the Segments and Extents in Oracle equivalent to Filegroups in SQL Server.
Appreciate your help
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Jul 23, 2005
Something strange.I have a database(SQL2000) with two file group(on seperate physicaldrives).One is meant for table data[PRIMARY] and one for indexes [INDEX].So i create a table on the [PRIMARY] file group, and fill indata.Next I build a clustered index on the table, on the [INDEX] filegroup.Once the index is built, the database now indicates that the filegroupfor the table [INDEX]! and not [PRIMARY] as i originally set it up for!My question it then: Has the table been moved or is this somehow anerror in SQL server?I would really appreciate any thought anyone might have on this?
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Nov 23, 1999
hello
how can i transfer my already user created tables from primary group to newly created file group.
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Jul 20, 2005
I will be doing some performance testing on financial application nextmonth. Without going into a lot of details, I suspect I will have apotential bottleneck when writing to the log file.My hardware setup is a quad 2.8 Xeon Dell server direct attached to aDELL/EMC CX200 (Fibre channel array with 10 X 30something GB, 15,000rpm drives, with about 1GB of memory on the array for caching.This is a benchmark environment, so I am not concerned about loosingdata. I am looking for a little guidance on using raid (0 or 10)and/or file groups to spread IO to db objects (log file(s), data,indexes, tempdb, etc). I have read about and played with file groupsenough to know that SQL server does some level of load balancingacross file, but am unclear it is in parallel or serialized.Common wisdom seems to be to separate data, non-clustered index, logs,and tempdb onto separate files, but I am unclear on how to make bestuse of the high-speed disk array. I'd greatly appreciate opinions onwhich would perform better; one file on a stripe set of N drives (raid0 or 10), N files in a file group placed on N (non-striped) drives, ora combination of the two? Is the answer the same for both log and data(or index) files?Thanks,-Bernie
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Apr 28, 2014
I am looking for the easiest way of rebalancing data across multiple files.
Instead of creating a secondary filegroup and then dropping and recreating all indexes in the database which is going to take ages (we have a lot of tables and indexes), I am trying to just add more files to the primary file group and then rebalance data evenly between these.
I guessed that adding the new files to the primary file group and then rebuilding all indexes on a table should redistribute the table over these multiple file groups evenly. This is not the case though. It does rebalance data a bit but I still end up with the majority on the first file that existed.
I have attached the script I am running, maybe it is something in the create database/file statements that is the issue.
Basically what I am seeing is to start off with the table is 160MB. I then add the file groups and rebuild all indexes on the table. The first file is then about 100MB and each of the three other files are about 20MB. I would expect them all to be the same size.
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Jul 30, 2014
We have a large Datawarehouse and the size is 50TB.. The tables are placed in filegroups based on the schema like fact, dimensions, raw data each sit on seperate filegroups. I am thinking will it make sense to seperate the large facts which are having billions of rows so that they reside on filegroups on their own..
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May 27, 2009
I would like to SELECT all filegroup on an SQL server instance, is that possible?Or only per database?
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Apr 6, 2006
Hi All,
I am facing a peculier problem. Problem definition goes like this,
I have one staging DB in which all the tables resides in Primary file and one production DB in which tables resides in 2 secondary files.
Now when iam trying to load the data from the table A in staging which is on primary file to the table A1 in production DB which in secondary file, all the data are going to error log instead of table A1.
Can you please tell me, where am i going wrong.
Regards,
Chetan
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May 8, 2007
We have recently added a new file group and file on a new drive. We have tested it by moving a small table to the new file group. We would like to relocate a new table to this file group but the table is about (we estimate) 75GB. My question is this: How long can we expect the transfer of data from the current file group to the new one for this table? I understand that depending on our hardware the answer may vary but does anyone have a rough estimate?
The current current (primary) file is located on a DELL SAN and the new secondary group is on a EMC 4700 both are connected via fiber channel.
Also a bonus question would be: Does a "normal" database backup created as a maintenance plan backup the seconary data as well into the BAK file?
Like I said a rough estimate is fine.
Many thanks,
Scott
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May 31, 2007
Hello,
I am building partitiong tables, partitioning on different file groups:
the question is:
Partitioned table referred to old data that are not frequent accessed for reporting can be stored on separate location(External storage, tape and so on) or to make partitioning functioning must all file groups must be presents?
If not, how can I separate old data from current ones (still using partitioning) to reduce the size of DB?
What it is the best for storage data and easy to access it when needs arise (eg reporting): Tape, external storage, others?
Thank
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Jan 25, 2008
I have a new SQL 2005 (SP2) Reporting Services server to which I've just upgraded and deployed some SSRS 2000 reports.
I have a subreport that contains a matrix with two groups. The report data seems to be inexplicably repeating the data for the first row in the group for all rows in the group. Example:
ID1
ID2
DisplayData
1
1
A
1
2
B
1
3
C
2
1
A
2
2
B
2
3
C
Parent group is on ID1, child group is on ID2, report would show:
1
1
A
2
A
3
A
2
1
A
2
A
3
A
Is this a matrix bug in 2005 SP2, or do I need to do something differently? I can no longer pull a comparison version from an SSRS 2000 server to verify, but I believe it was working as expected before...
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Sep 17, 2014
When the database is configured for mirroring and you want to do partitioning on that database, How can we do? Is this similar process or any variation there while adding file groups and files? The partition will reflect in the mirroring database also?
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Oct 19, 2015
is there a way to restore all file groups except one? example: Database A has 10 filegroups, but 1 of them is defunct, so i cant delete it and there's no backup for restore it.Can I create a new DB restoring the 9 good FGs from a database A's backup?
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Aug 20, 2015
I would have to handover my DB with only Primary tables to client as part of SLA.Â
I am planning to keep these primary tables on a secondary file-group but how-ever, I will still have my procedures on primary file-group.Â
How can I accomplish this with client having no exposure to my stored procedures.Â
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Apr 20, 2001
We are in the process of replacing our primary production server. In the process of determining how SQL server is going to be structured, it has been suggested that I place all current and new indexes on a separate file group. These filegroups would then reside on a separate shelf on the server. What are the pros and cons of doing this?
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Aug 21, 2014
OK, so I have:
- 500 GB DW
- 5 GB in smaller DBs
- 220 GB TempDB
- 350 GB in Log files.
My machine is Fujitsu Primergy 64 cores (with HT) and 192 GB RAM.
I have several IO locations:
- 540 GB in-server HDD 15k RAID10
- 1 TB HDD 15k RAID10 on SAN (separete controller)
- 2 TB HDD 15k RAID10 on SAN (same controlller as below)
- 800GB SSD RAID10 on SAN (same controller as above)
Data warehouse has 2 fact tables that are absolutely crucial and quite large.
Now i want to organize DB into several Filegroups and put them on different drives. Filegroups I'm thinking of:
- FILEGROUP1: for 1st crucial Fact Table
- FILEGROUP2: for 2nd crucial Fact Table
- FILEGROUP3: for tempDB
- FILEGROUP4: for dimensions data
- FILEGROUP5: for the rest of facts data
- FILEGROUP6: for dimensions indexes
- FILEGROUP7: for the rest of facts indexes
- FILEGROUP8: for 1 log file of one smaller DB (its in full-recovery and its quite large)
- FILEGROUP9: for the rest of log files
- FILEGROUP10: others
How should I organize them across available drives? I was thinking about sth like:
800 GB SSD: FILEGROUPS 1-3
2 TB RAID10: FILEGROUPS 5+7+8
1 TB RAID10: FILEGROUPS 4+6+10
540 GB in-server: FILEGROUP 9
I know that having multiple filegroups on the same drive is pointless regarding performance, but in future i could actually add some more drives, so i want to separate them now.
Also - how much files per filegroups should i create? Considering 1 or 2. Except TempDB where I am going for 4.
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Mar 30, 2007
We have a set of databases some are fully read-only others have read-only file groups, is there any way to restore backups of these taken on an MSDE 2000 to an SQL Express 2005 instance?
When doing the inplace upgrade we change these to read-write before the upgrade and set them back after the upgrade.
These databases are used in the field by customers althought the controlled upgrade requires a backup before (and blocks if it fails) and tries a backup after if the post upgrade backup fails (due to disk space) we might need to recover from this odd situation.
The only solution I have is install MSDE some place restore to this then do the controlled upgrade again, any other ideas?
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Jan 8, 2007
I expect to get a record below with a count of 0 (and I do), but when I take the comments out (--) of lines 1 & 6 I don't understand why I get no records at all. I need to be able to see all teams in EvalAnswers even if none of the records satisfies the where clause.1 select Count(*) as cnt--, TeamID
2 from EvalAnswers
3 where CoID=@CoID
4 and EvaluatorID=@EvaluatorID
5 and (Scr0=0 and Sugg0 is NULL)
6 --group by TeamID
7
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Jan 31, 2002
Hi,
I would like to create groups in SQLServer2000.Do i need to do this by roles or can i create groups for each database.I read some where that there where
no groups for SQLServer7.0. Is this option available for the latest versions.
Any help will be appreciated.
Thanks in Advance.
Ran.
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Nov 24, 2011
I have a Attendance table named say Attendance which has Class and Status along with some other fields.Class will have the name of the class the student is in,whereas the status will have the Absent/Present data.There is another table named say ClassMaster which is the master which will have all the classnames and there is a column of ClassTeacher which will have the EmployeeCode.This employeeCode comes from a table EmployeeMaster.My requirement is i want to get the count of Absent students in Attendance table depending on the Class.For Example if there are two class say ClassA and ClassB,then i should get the count of the Students from Attendance table that belong to Class A and Class B.How cn i do this in one Query.
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Jul 20, 2005
I realize the irony of asking this here, but does anyone know of any MySQLgroups where I can ask my questions?Thanks.
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May 16, 2008
In my report I have 3 row groups and two column groups as follows, where measure is number of hours for a given project.
2008/05 2008/06 ........
Demand | Allocated Demand | Allocated
- Project 1 1500 1000
- Department1 500 400
- Employee1 200
- Employee2 200
- Department2 1000 600
- Employee3 300
- Employee4 300
+ Project 2 1200 1000
-------------------------------------------------------------------------------------------------------------------------
Grand Total 2700 2000
My question is, is this possible using a Matrix? I have used matrix in some of my reports but have always used automatic/generic SUM feature it provides.
Note carefully that there are no values for Employees in Demand Column Group. Basically I would have to SUM Department groupings to get the Project level total and then SUM all Project Groupings to get the grand total. The Allocation column is okay since the Employees have values in that column. Can this be done using InScope( ) or some other function rather than simply doing the Generic SUM of Rows and Columns of the matrix which would probably throw error when trying to sum a blank value in demand column.
Thanks in advance.
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Apr 13, 2007
How do I put information only at the top of a page and have it change whenever a group occurs.
I want to do something like this. Have this on the top of every page:
Country: current country
State: current state
City: current city
There is a group on country, state and city. Whenever city changes the next page will display a new city. Whenever state changes the next page will display the new state in the header.
I have already put Country, State, and City into their own group headers. However, if either of them change in the middle of the page then the group header repeats. I have group header repeat on so I can see it on each page. If I choose the Page break at start then it breaks but I don't want it to break. I want it to run on the same page if it passes a group and then have the next page display relevant information for the group.
Putting it in the table header works as far as keeping them all on the top of the page but it doesn't change when a grouping ends.
Please assist me in anyway you can.
Thanks,
Sarah
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Mar 17, 2008
I have my first SSRS report going, after years on Crystal and Access. It has several groups, each nested within the next...I think. I'm having a little trouble with the groups...well, grouping the way I thought I had it set up. The groups come out looking like my primary group is second instead of first, although when I look at the groups in "edit groups" it appears I have them set up correctly.
In Crystal, on the preview page you could see the groups idendified so if there was a problem in a report you could tell what group it was coming from. You could also select and change objects in preview, which made it nice to see the impact of changes. I cannot see either of these features in SSRS. I'm hoping that there's a setting I need to turn on, and also hoping that this product has these user friendly features. Any ideas on that?
Also, in Crystal, when you set up a group or a formula, it became available in the field list within the formula builder, so you could use them by picking them instead of typing the whole thing in again, and that's not available either. Or I can't find it!
Since I'm new to SSRS maybe there are features and settings I haven't found yet, but would appreciate any comments from more experienced users about the overall usability of this tool.
Thanks!
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Apr 20, 2007
Is there any way to keep a table group together. MSFT says no but I can't believe this limitation exists. It's a basic reporting function in any reporting software I've used.
I have one group in a table. I don't want the detail rows to be split when it gets to the bottom of the page.
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Nov 3, 2007
Server:
Sql 2005 SP2 running on Win2003 Ent. SP1
I have a 3rd party app that needs me to add a user to the SQLServer2005SQLAgentUser group for the instance I placed the DB in. This group doesn't exist on my server for any of my instances. Is there a simple way to generate it or a document that can tell me how to manually create it?
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