Setting Up Directories - Data Paths In Server?
Aug 4, 2015
I'm curious if there's a "best practice" for setting up the data directories MS SQL will use for each operation? I've allocated independent disks for things like C: (OS), E: (DATA), etc etc etc but I'm not familiar w/ MS SQL to understand how DBA's commonly configure the folders under each unique disk for things like DATA, LOGS, BACKUP, INDEXES, and TEMPDB. Should I have an identically name folder as show below in my example?
You can see I've just mirrored the drive name to a new folder under the partition so data is being written to: F:DATA and E:LOGS. Is this considered correct / good practice? I assume naming the folder in each mount point to whatever I logically called the drive is correct but if I should change how I configure my drive paths above. I'm trying to learn common good SQL Server practices and while I work on properly installing SQL Server 2012/2014, I want to make sure I configure my partition names SQL will utilize correctly.
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Apr 15, 2015
SQL 2008
I have a table that has company id, attachment file name, folderexists columns.
First what I need to do is create a series of folder or directories on a networked server using the company id as the folder name where the folder name does not already exist.
Second I need to move files based on attachment file name and company id to the proper folder.
For those who want to know, this is a remediation project because of a bug in our application.
The application is supposed to created the folder based on company id and then put the attachment in that folder.
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Jan 11, 2006
I'm planning to establish a recovery plan for my SQLServer 2000databases. How to change home and data directories?
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Mar 19, 2007
I have sql server reporting services installed .
I have reinstalled the iis .
But now when i ever i reinstalled the reporting services i can't see any virtual directory in IIS.
SSRS installed successfully but no virtual directory
Now please let me help in making the virtual directories of sql server 2005 reporting services.
When I reinstall then if i try to connect with management studio I can't.
If i try to check surface area configuration i get following message
"Reporting services is not configured properly sqlsac"
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Jul 24, 2007
Ive just installed VS2005 Pro and SQL Server Developer edition.
Now I want to set the default paths for project, templates, settings. But I want for both VS and SQL files.
For example, right now the default folders for SQL Studio are:
.My DocumentsSQL Server Management StudioProjects
.My DocumentsSQL Server Management StudioSettings
.My DocumentsSQL Server Management StudioTemplates
.My DocumentsSQL Server Management StudioBackup Files
... and so on.
For VS Studio:
.My DocumentsVisual Studio 2005Projects
.My DocumentsVisual Studio 2005Templates
.My DocumentsVisual Studio 2005Code Snippets
... and so on.
I would like for all sub-folders(from SQL Server and VS) to be in one same folder(Development), for example:
.My DocumentsDevelopmentProjects
.My DocumentsDevelopmentSettings
.My DocumentsDevelopmentTemplates
.My DocumentsDevelopmentBackup Files
.My DocumentsDevelopmentCode Snippets
... and so on.
I have tried changing in each application´s options the default path for each one, pointing to each folder I listed above.
My problem is that both VS and SQL Server still keeps creating folders in the old locations, for example: ".My DocumentsSQL Server Management StudioProjects". This example happens when I create a new query, and try to save it, it automatically creates that folder.
It only works for a few of them, like the settings folder. Ive managed to create a single folder for SQL and VS setting files.
Is there a way I can join both Application folders? I want to keep both projects files in one folder, both setting files in one folder, and so on...
I hope I explained well my situation.
Thanks!
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Apr 10, 2008
Currently I have an sql string which looks like this
INSERT INTO tblPDFFiles (fileType,PDFcontent) SELECT 'First test file', BulkColumn FROM OPENROWSET(Bulk 'C://Test.pdf, SINGLE_BLOB) AS BLOB
But the files i am trying to access is on a different shared server called 'test2008' now im told I can access this doing
INSERT INTO tblPDFFiles (fileType,PDFcontent) SELECT 'First test file', BulkColumn FROM OPENROWSET(Bulk '
\test2008 estpdf.pdf', SINGLE_BLOB) AS BLOB
Which I made sure had the pdf there I get the following error
SSIS package "Package.dtsx" starting.
Error: 0xC002F210 at Execute SQL Task, Execute SQL Task: Executing the query "INSERT INTO tblPDFFiles (fileType,PDFcontent) SELECT 'First test file', BulkColumn FROM OPENROWSET(Bulk '\test2008 est.pdf', SINGLE_BLOB) AS BLOB" failed with the following error: "Cannot bulk load because the file "\test2008 est.pdf" could not be opened. Operating system error code 5(Access is denied.).". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.
Task failed: Execute SQL Task
Warning: 0x80019002 at Foreach Loop Container: The Execution method succeeded, but the number of errors raised (1) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.
Warning: 0x80019002 at Package: The Execution method succeeded, but the number of errors raised (1) reached the maximum allowed (1); resulting in failure. This occurs when the number of errors reaches the number specified in MaximumErrorCount. Change the MaximumErrorCount or fix the errors.
SSIS package "Package.dtsx" finished: Failure.
How do I give access to this other server to my SSIS package
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Oct 29, 2015
What are the potential risks of keeping data , log , tempdb backups etc in the same drive although in different folders ?
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Oct 26, 2015
I have a problem where I need to select all top level file paths from a string value in SQL
So I have a column "Locations"
Example Data:
X:folderanotherfolder
X:folderyet another folder
X:foldernameanother folder
X:foldernameyet another folder
I'd want to return only:
X:folder
X:foldername
I need to somehow parse the sting and capture anything before the second ''?
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Jan 22, 2007
I am running Microsoft SQL Server 2005 Express Edition, and I am having difficulties setting up an ODBC User Data Source to connect to the SQL server.
I have tried going through "Control Panel -> Administrative Tools -> Data Sources (ODBC)" to add a user data source. For the SQL Server to connect to, I have tried specifying "localhostSQLEXPRESS", "SQLEXPRESS", "(local)", etc. -- but nothing seems to work. When the DSN configuration wizard tries to connect to the SQL Server to obtain default settings, it fails with the error "SQL Server does not exist or access denied". (Same error occurs if I try connecting to this ODBC data source later.)
But I know that the SQL Server exists and I have been using it through the SQL Server data provider in another application.
I am new to this, so any help or pointers would be greatly appreciated.
Thanks,
Kumar
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Nov 23, 2007
Our mobile application using VS2005 with VB.net is ready and we are trying to set up the SQL CE on the server to test the remote connection procedures. Sql 2005 is based on a dedicated server and is accessed via the Web server which does not have Sql installed on it. We have installed the Sql Server Me Server Tools on the Web server and configured the Virtual directory with IIS. What we cannot get our heads around is how we link the database on the separate Sql server via the web server. When the Pda contacts the Web server via IIS we somehow need to redirect to the dedicated Sql server as it cannot be contacted outside of our network. We have been told that Sql Ce can link with an existing Sql 2005 database, how can we do this?
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Sep 15, 2011
I have a requirement to set up an Oracle linked server, Ive never done this before and in fact never touched Oracle so I dont really know what I am doing.
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Aug 31, 2000
we have snapshot replication set up between 2 servers. works like a charm... :-)
the problem is this: several agents are set to run every half hour (snapshot & distribution). every time they run, the agents create a new directory entry under MSSQL7REPLDATA (naming convetion: YYYYMMDDHHMMSS) and load it with files....
needless to say, after several days there are a LOT of directories. right now, we remove them manually, which is time consuming and a pain in the ass...
how do i configure SQL server to only make 1 or 2 dozen directory entries before starting to recycle them?
if this is a really simple fix everyone here knows, my apologies for clutering the board with a 'newbie' post. i'm not really a DBA, i was just 'volunteered'!... :-)
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Mar 6, 2008
I've been trying to look for information about using an SQL 2005 database with ASP.NET 2.0 - while there are loads of different articles coving configuring a database to use with asp.net, I cannot find anything on securing a sub-folder in my asp.net application. At the moment I am successfully connecting to, and validating users via a login page in my asp.net application, however, this is all pointless since I can still browse to the pages without logging in! I have tried putting in the usual <location> tags in my root web.config file and asp.net throws an error referring to my connection string, I have also tried adding a web.config file to the sub-directory, but that just uses the windows login, and I can't find anything that'll allow me to tie my own login page to it... Arrrgh! Any help will be greatly appreciated!
Thanks in advance.
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Oct 16, 2000
I have a machine where the SQL "data" directory was installed on the smaller drive instead of the larger drive. What do I have to do to move the existing databases? (Backup/restore, or detach - move it physically, then attach?)
Thanks, for the help
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Sep 13, 2007
Has anyone ever had a need to backup to multiple directories? I am building a general purpose stored procedure to do various types of backups, and I was wondering if the need to do this is common enough to make it worth the effort.
Example of backup to multiple directories:
backup database [MyBigDatabase]
to
disk= 'D:BACKUPMyBigDatabase_db_200709131454_001.BAK' ,
disk= 'E:BACKUPMyBigDatabase_db_200709131454_002.BAK' ,
disk= 'F:BACKUPMyBigDatabase_db_200709131454_003.BAK' ,
disk= 'G:BACKUPMyBigDatabase_db_200709131454_004.BAK' ,
disk= 'H:BACKUPMyBigDatabase_db_200709131454_005.BAK'
with
init,
stats = 5
CODO ERGO SUM
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Sep 30, 2007
Hi
I'm pulling my hair out on this one..... Installed SQLServer 2005 Express and upscaled my website and intranet site that runs my photo image library.
All my thumbnails and images are in a local D drive, while my site root is in C drive. I.e. <img src="file:///D|/Images-WMASTER......etc
Images will now not display. I've checked folder & sharing permissions, IIS permissions, all the usual stuff, but still with no luck after 2 weeks #@%$$@!!
If I change to a networked folder, such as <img src="file:///S|/Images-WMASTER...etc then they show fine.
All I can think is that there is some permissions issue with SQLServer that I'm unaware of.
Your erudite advice would be greatly appreciated!
Thanks, Rob
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May 3, 2007
Hey All,
I'm tring to figure out the best way to organize my reports.
When I create a new Reporting Service Project throught the 2005 .NET IDE, I'm allowed to have 1 folder in the project to deploy to. I've tried adding folders under the default Reports folder, but I haven't found a way to do this. I'd like to be able to add more directories so I can deploy them right to the server, and they will be in the proper folders, with the correct access rights.
A developer here has offered the approach of One Report - One Project. I don't want to do this because the reports have so much in common, like datasources, that I don't want to be flipping back an forth from one project to the next.
I did also look to see if there was a way to assign a dircetory to each report, rather than the project level, but I didn't see way to do that. I also, tried to add folder through the Windows Explorer and see if I could get around this restriction, but no luck there either.
Anyway, How is everyone else organizing they projects?
Eric Wild
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Apr 14, 2008
Hi,
I recently upgraded my Standard Edition SQL2005 to Developer Edition SQL2005 for the default instance (MSSQLSERVER) only. I used the following command line setup.exe commands to do the job -
start /wait setup.exe ADDLOCAL=SQL_Engine INSTANCENAME=MSSQLSERVER UPGRADE=S
QL_Engine PIDKEY=OHNOYOUCANTSEETHISSORRY SKUUPGRADE=1 /qb
then
start /wait setup.exe ADDLOCAL=Analysis_Server,RS_Server INSTANCENAME=MSSQLSERVER UPGRADE=Analysis_Server,RS_Server PIDKEY=OHNOYOUCANTSEETHISSORRY SKUUPGRADE=1 /qb
(Of course I used my real PID)
I then re-installed the SP2 patches. Everything seemed fine afterwards, until I tried to process a recent cube project in Visual studio. The DATEDIFF() function failed. So I found the problem (in this forum) that the VBAMDX assembly for my SSAS session was referencing an empty bin folder, and therefore could not process VBA functions in MDX.
Now I can fix this by editing the relevant XML file in the DATA folder and restarting my SSAS service but I am concerned about all the other stuff that could be referencing old folders.
Some of the settings e.g. DATA is still in C:Program FilesMicrosoft SQL ServerMSSQL.2OLAPData
but the bin programs are now in C:Program FilesMicrosoft SQL ServerMSSQL.6OLAPData
It seems that I now have 3 new installation folders - MSSQL.5, MSSQL.6, MSSQL.7 as well as the usual .1,.2,.3 since upgrading my Edition.
Why did it make these? What else may be out of wack on the SQLServer services? How can I make sure everything is properly setup?
I guess the problem could be that there is another instance called OFFICESERVERS on the computer (a WIN2003 server) which was created by the SharePoint installation by someother guy..
adv(thanks)ance
Mark W.
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Apr 9, 2008
Hey,
What I am trying to achieve currently with SSIS is to view the content in one folder for example 'New' and if there is files in this then move it to 'Archived'.
Any nice liinks or tutorial or general advice you guys could give me ?
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Nov 12, 2007
Hi
I have sql 2000/2005 installation path errors in some of prodution servers. Like we have standards that backup files should go to E: drive and data files to f: and log files to h:. Can any one help me in this issue what can be done with out reinstallation,
Thanks in advance
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Mar 30, 2006
We have a growing issue where we have a relative dtsconfig file (which stores the absolute base path of the ETL packages). This way we can keep the ETL projects failry portable - only having to modify one value in the dtsconfig file. The master package that defines the dtsconfig location (which is config/Default.dtsconfig) usually interpretates this location to be relative the project. The problem is that every now and again when you open this package in .NETStudio, the path is interpreted differently and causes: config/Default.dtsconfig to state invalid path. But when we delete the variable (which defines the dtsconfig path), save/close and open/recreate it works again. This may or may not be supported MS method, but I was curious to know why this gets messed up. Is there somehwere in the .NET framework that defines what "/" is relatively under?
For example: Our absolute config path is "D:Program FilesMicrosoft SQL Server90DTSPackagesETLProjectETLBaseconfigDefault.dtsconfig" but using: "config/Default.dtsconfig" for xml file value works. However, sometimes we will get an error stating that this file cannot be found, and when we just try to delete (without saving and closing) and immediatelly try to put "config/Default.dtsconfig" again and hit next, we get an error and the path is now:
'D:Program FilesMicrosoft SQL Server90DTSPackagesDEVDataExchangeETLBaseconfigconfigDefault.dtsconfig'.
Ideas?
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Jan 29, 2008
Hi,
I have uninstalled and reinstalled several times and I can't get Reporting Services to create the virtual directories in Default Web Site, instead it creates a new web site called Report Server with the virtual directories under that, this Report Server website points to C:Program FilesMicrosoft SQL ServerInetPubwwwroot. Any ideas as to why this happens? My Default Web Site is called Default Website from the initial IIS install , I am on XP Pro SP 2 with IIS 5.1.
This is an issue for me since I don't want to have on another site that doesn't have the aspnet mapings.
I am dumbfounded and can't figure out what to do to make it not do that with the default configuration option checked during install. Should I uninstall and reinstall again and not use the default configuration?
Regards,
Chris
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Aug 24, 2015
I contact you because we installed Report Services 2012 and after configuring werb service URL, database, Report Manager URLs... the URLs linked to the Report server + Report Manager does not work.After searching in IIS, it seems that even if virtual directories are created, they are linked to directories which does not exist :- c:Program FilesMicrosoft SQL ServerMSRS11.ReportReporting Services does contain only LogFiles and RSTempFiles directories.
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Jan 7, 2008
using System;
using System.Data;
using System.Data.SqlClient;
using System.Data.SqlTypes;
using Microsoft.SqlServer.Server;
using System.Collections;
public partial class UserDefinedFunctions
{ [Microsoft.SqlServer.Server.SqlFunction(FillRowMethodName="Obj_Row",
IsDeterministic=true,IsPrecise=true,
TableDefinition="ObjID int,OjbDataID int,ObjDataValue nvarchar(400)",DataAccess= DataAccessKind.Read)]public static IEnumerable Obj_IDs(SqlInt32 Data_1, SqlInt32 Data_2, SqlInt32 Data_3)
{using (SqlConnection conn = new SqlConnection("context connection=true"))
{
try
{ if (!Data_2.IsNull)
{string sql = @"Select Obj_ID, Obj_Data_ID, Obj_Data_Value from tbl_Obj_2";
SqlCommand cmd = new SqlCommand(sql, conn);SqlDataAdapter da = new SqlDataAdapter(cmd);DataTable dt = new DataTable();
da.Fill(dt);
conn.Open();return dt.Rows;
}if (!Data_3.IsNull)
{string sql = @"Select Obj_ID, Obj_Data_ID, Obj_Data_Value from tbl_Obj_3";
SqlCommand cmd = new SqlCommand(sql, conn);SqlDataAdapter da = new SqlDataAdapter(cmd);DataTable dt = new DataTable();
da.Fill(dt);
conn.Open();return dt.Rows;
}
}catch (Exception ex)
{
ex.Message.ToString();
}
finally
{
conn.Close();
}
}
}public static void Obj_Row(Object item, out int ObjID, out int ObjDataID, out string ObjDataValue)
{DataRow row = (DataRow)item;
ObjID = Convert.ToInt32(row["Obj_ID"]);ObjDataID = Convert.ToInt32(row["Obj_Data_ID"]);ObjDataValue = row["Obj_Data_Value"].ToString();
}
};
//Error 1 'UserDefinedFunctions.Obj_IDs(System.Data.SqlTypes.SqlInt32, System.Data.SqlTypes.SqlInt32, System.Data.SqlTypes.SqlInt32)': not all code paths return a value
I'm newbie. Please, show me how to correct the problem. Thank you.
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May 22, 2007
This has probably been covered in other posts. I have been working with SSIS for the past month and I am trying to follow best practices on various items. Having worked with a different ETL tool prior to this, I am wondering what is the best approach to use for Connections and File Paths.
What I would normally do with DataStage for this would be to assign a Job Variable (and eventually Sequence Variable) of the type: Path. So, if I was developing a job I would create SourceFilePath, ErrorFilePath, etc. I would use these variables in a FlatFile or Dataset Stage. For instance I would assign a filename for a source as: #SourceFilePath#SourceFile1.txt. During execution the job would load the variable and then the filename would be: C:MyDocumentsDatafilesSourceFile1.txt.
When its time to move to another environment, I don't have to worry about changing values for file connections because it is managed dynamically by a config file or whatever method.
What is the best practice that emulates this behaviour for SSIS? I've been thick and can't get my head around this. Any direction to blogs or user sites would be great. Examples, even better!
Thanks in advance.
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May 6, 2007
Hi:
I am trying to set up a TEST ENIVORNMENT for a reservation software package. I need this setup so that I can run various scheduling scenarios in order to optimize operations. Below I have been given instructions from the software vendor on how to set up my SQL database. However, I am a little confused on what to do for a couple of the steps. They are as follows:
***In SQL server 2000 enterprise manager on the test laptop, change the 2 path settings in the table SGCONFIG. The should be changed to C:StratagenAdept5Server. ** YOU WILL NEED TO DO THIS STEP EVERYTIME YOU RESTORE A BACKUP ADEPT5_CLASTRAN.BAK FROM THE PRODUCTION TO THE TEST ENVIRONMENT
QUESTION: How do you change the path settings on a table?
***Open the .udl files in the apps folder and the server apps folder and check to see that they are pointing to the test laptop server, not the production server.
QUESTION: What are the .udl files and how do you check to see if they are pointing at the test laptop server only?
Thanks sincerely for your help. I am trying to meet a deadline for a meeting tomorrow. Therefore, I am desperate. Please send me email. rtanner@clastran.com.
Ron
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May 6, 2007
Hi:
I am trying to set up a TEST ENIVORNMENT for a reservation software package. I need this setup so that I can run various scheduling scenarios in order to optimize operations. Below I have been given instructions from the software vendor on how to set up my SQL database. However, I am a little confused on what to do for a couple of the steps. They are as follows:
***In SQL server 2000 enterprise manager on the test laptop, change the 2 path settings in the table SGCONFIG. The should be changed to C:StratagenAdept5Server. ** YOU WILL NEED TO DO THIS STEP EVERYTIME YOU RESTORE A BACKUP ADEPT5_CLASTRAN.BAK FROM THE PRODUCTION TO THE TEST ENVIRONMENT
QUESTION: How do you change the path settings on a table?
***Open the .udl files in the apps folder and the server apps folder and check to see that they are pointing to the test laptop server, not the production server.
QUESTION: What are the .udl files and how do you check to see if they are pointing at the test laptop server only?
Thanks sincerely for your help. I am trying to meet a deadline for a meeting tomorrow. Therefore, I am desperate. Please send me email. rtanner@clastran.com.
Ron
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Nov 20, 2005
What are the SQL 2005 Upgrade Paths? For example, is there a direct in-place upgrade for SQL 6.5? SQL 7.0? Can someone provide a link please? Thanks in advance.
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Mar 17, 2008
I have created over a hundred reports and each of them are scheduled to output a pdf. The problem is this was temporary and each week I would like to output the reports to a directory that is based upon time. For example, I have 13 groups of reports and each group has 9 reports. Each group has it's own directory and folder. IE group A would be saved in something like \client filesgroup aweekly reportsMar 17 2008. The next week the reports for the same group need to be saved in \client filesgroup aweekly reportsMar 24 2008. This would be the same for each of the groups; group A, group B etc.
The question is there a way to set these paths dynamically or at least iterate through the subscriptions and change the paths?
Cheers
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Jun 28, 2006
I have an ActiveX Script Task in SQL Server 2000. It chooses one of two
possible success-paths depending on if a file exist or not. (Part of the old ActiveX Script for choosing next step is below)
I need to rewrite this for a Script Task in SQL Server 2005 but it seems like it
doesn't have this functionality and objects.
Does anyone know how to write the code for choosing the next step in a
Script Task or knows another way to solve my problem?
The package is not suppose to fail if the file is missing, it's must succeed and that's why I need two success-paths.
Regards,
Sara
'**********************************************************************
' Visual Basic ActiveX Script
'************************************************************************
Function Main ()
Dim pkg
Dim stpContinuePkg
Dim stpExit
SET pkg = DTSGlobalVariables.Parent
SET stpContinuePkg = pkg.Steps("DTSStep_DTSActiveScriptTask_4")
SET stpExit = pkg.Steps("DTSStep_DTSActiveScriptTask_21")
If ...... Then
Main = DTSStepScriptResult_ExecuteTask
stpContinuePkg.DisableStep = False
stpExit.DisableStep = True
Else
.......
End If
Main = DTSTaskExecResult_Success
End Function
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Jan 16, 2004
[[Disclaimer: I am by no means a highly-skilled DBA. I have just enough db skills to get my job done, which involves light sql server and oracle tasks. I appreciate the help, guys.]]
I am trying to replace the path section of filenames listed in a collumn of my database. The filenames are UNC paths, and all files have 8 digit filenames with the same extension (they are all tif images). The length of the paths in the filenames will change, however.
Here is what my old paths look like:
\imageimagesNYY-MMABCDEFGH.TIF
..and here is the new path (all of the images are being consolidated into one directory):
\als-imagealscom31imagesdbABCDEFGH.TIF
-------------------------------------------------------------
I have tried using the following query to do this:
update image set filename=replace(filename,'\imageimages5 0-08','\als-imagealscom31imagesdb')
This returns insanely crazy results like 460239 row affected, when it should be about a thousand.
--------------------------------------------
I have also tried the following:
update image set filename=right(filename,12) + '\als-imagealscom31imagesdb' where left(filename,21) = '\imageimages5 0-08'
This affects zero rows.
Please guide me down the one true path. My coworkers are clueless and I'm quickly running out of disk on the old box.
peace,
-jake
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Sep 11, 2006
Hi there.I've been searching for this error specifically but I haven't found anything yet.I have these two tables (USERS and REQUESTS):USERS ( [LOGIN] [varchar] (10) NOT NULL , [NAME] [varchar] (20) NOT NULL)where LOGIN is the primary key.The problem comes when I try to create the "REQUESTS" table.In these requests there's one user who types the request. After one or two days, there's other user who aproves the request. The problem is that I need two foreign keys referencing the table "USERS".CREATE TABLE REQUESTS ([ID] [numeric](5, 0) NOT NULL ,[DATE] [datetime] NOT NULL ,[NOTES] [varchar] (100) NOT NULL ,[TYPED_BY] [varchar] (10) NOT NULL ,[APROVED BY] [varchar] (10) NULL) ON [PRIMARY]GOALTER TABLE REQUESTS ADD CONSTRAINT [PK__REQUESTS__07DE5BCC] PRIMARY KEY ( [ID]) ON [PRIMARY] GOALTER TABLE REQUESTS ADD CONSTRAINT [FK__REQUESTS__TYP__15702E88] FOREIGN KEY ([TYPED_BY]) REFERENCES [USERS] ([LOGIN]) ON UPDATE CASCADE ,CONSTRAINT [FK__REQUESTS__APR__12742E08] FOREIGN KEY ([APROVED_BY]) REFERENCES [USERS] ([LOGIN]) ON UPDATE CASCADEAnd SQL returns:Introducing FOREIGN KEY constraint 'FK__REQUESTS__APR__12742E08' on table 'REQUESTS' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.Could not create constraint. See previous errors.Ok, after that, I tried creating a new table to store aprovals (Table with two fields: "REQUEST_ID" and "APROVED_BY").So, I removed "APROVED_BY" field from "REQUESTS" and its FK constraint.The same error comes up.I don't think this structure goes into "cycles" or "multiple cascades".How can I do this?Thanks in advanceRegardsRoland
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Oct 1, 2003
Here a code for finding all minimal loops (cyclic paths) in a graph
with vertexes of degree >= 3. Almost obviously that before seeking
for loops we should eliminate from the graph all its vertexes of degree < 3
(degree of a vertex is the number of edges outcoming from the vertex).
Note: there are no any 'parent' - 'child' nodes here. All vertexes are
absolutely equitable.
if object_id('g3')>0 drop table g3
if object_id('g3x')>0 drop table g3x
if object_id('g3y')>0 drop table g3y
if object_id('g3l')>0 drop table g3l
GO
create table g3y(v1 int, v2 int) -- ancillary table
GO
create table g3x(n int, v1 int, v2 int) -- ancillary table
GO
create table g3l(nl int, v1 int, v2 int)
-- table for storing of 'detected' loops
GO
create table g3(v1 int, v2 int)
-- table of test data with pairs of adjoining vertexes
-- each vertex is named by an arbitrary number
GO
insert into g3
select 2, 3 union all
select 2, 4 union all
select 1, 4 union all
select 3, 5 union all
select 5, 6 union all
select 1, 6 union all
select 4, 7 union all
select 6, 8 union all
select 3, 9 union all
select 1, 7 union all
select 2, 7 union all
select 1, 8 union all
select 5, 8 union all
select 2, 9 union all
select 5, 9 ----union all
/*
select 2, 13 union all
select 3, 13 union all
select 13, 14 union all
select 12, 14 union all
select 12, 15 union all
select 11, 15 union all
select 11, 13 union all
select 10, 11 union all
select 10, 12 union all
select 10, 14 union all
select 10, 15
*/
GO
insert into g3 select v2, v1 from g3
declare @i int, @n int, @v1 int, @v2 int
set @i=1
while 0=0
begin
set @n=1
truncate table g3x truncate table g3y
select top 1 @v1=g3.v1, @v2=g3.v2 from g3 left join g3l on
(g3.v1=g3l.v1 and g3.v2=g3l.v2)or(g3.v1=g3l.v2 and g3.v2=g3l.v1)
where g3l.nl is null if @@rowcount=0 break
insert into g3x select @n, @v1, @v2
while @v1<>(select top 1 v2 from g3x order by n desc)
begin
set @n=@n+1
insert into g3x select top 1 @n, v1, v2 from g3 where v2=@v1
and v1<>@v2 and v1=(select top 1 v2 from g3x order by n desc)
if @@rowcount=0
begin
insert into g3x select top 1 @n, v1, v2 from g3 where
v2 not in (select v1 from g3x union all select v2 from g3x) and
v1=(select top 1 v2 from g3x order by n desc) and not exists
(select 0 from g3y where g3y.v1=g3.v1 and g3y.v2=g3.v2)
if @@rowcount=0
if @n>2
begin
insert into g3y select v1, v2 from g3x where n=@n-1
delete from g3x where n=@n-1
set @n=@n-2
end
else
begin insert into g3l select 0, v1, v2 from g3x break end
end
else
begin
insert into g3l select @i, v1, v2 from g3x set @i=@i+1
end
end
end
select * from g3l order by nl
Below is what we get:
nl v1 v2
----------- ----------- -----------
1 2 3
1 3 5
1 5 6
1 6 8
1 8 1
1 1 4
1 4 2
2 1 6
2 6 8
2 8 1
3 4 7
3 7 1
3 1 4
4 3 9
4 9 2
4 2 3
5 2 7
5 7 4
5 4 2
6 5 8
6 8 6
6 6 5
7 5 9
7 9 3
7 3 5
Of course, in general case not all found by the code loops are minimal.
But this is exactly my approach:
firstly find any possible loops (avoiding excessiveness!!),
then, in WHILE loop, try to mark out minimal loop(s) from intersection of
two non-minimal loops... seems it will be an interesting t-sql job.
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