Database Snapshot On SAN Attached Disks
Sep 27, 2007
Hi All
I am in process of moving a SQL 2005 solution from a development box that used local storage to UAT environment with SAN attached storage. The solution uses database snapshots
The database files are on the SAN storage but during testing I was unable to create a Database snapshot on the SAN disk. Creating snapshots on the local disk worked fine.
Is their some restriction/problem in using the database snapshot technology with SAN storage?
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Mar 2, 2005
Hello,
I am managing a sqlserver 6.5 database in my company. I get the message that the datafiles should be expanded but whenever I try to expand it the following message appears:
Could not find enough space on disks to extend the database. Meanwhile, I have about 6 gigabytes free space on my disks. Please help me out.
Thanks,
Albert
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Mar 17, 2014
I am testing out a blank database created over two physical files on two separate disks with one table called data which has one column called values nvarchar(max).
I filled the table up with a whole load of data and ran a select * against it. If I run Permon at the same time I can see that the read load has been spread over multiple disks as each of these disks is getting read from in parallel. If I create the same database on a single file and run the same select * again it takes much longer, proving that the read load has been distributed across multiple disks.
Now moving onto writes, this is where the confusion lies. I understand that SQL server fills files evenly until they need growing, after which it will then fill files individually until they are full in a round robin fashion unless you have trace 1117 turned on. What I don't understand is why the writes aren't distributed out whilst it is filling these file groups.
I ran an continual insert into my table with go 1000000 to monitor how the files are being filled up. I monitored where SQL server was physically placing the files as they were being inserted by running the following query:
;WITH CTE AS
(SELECT
sys.fn_PhysLocFormatter (%%physloc%%) col1,
RIGHT(LEFT(sys.fn_PhysLocFormatter (%%physloc%%),2),1) AS [Physical RID],
DATAID
[Code] ....
I could see that it would a thousand or so records into file 1, then a thousand or so into file 2, then a thousand or so into file 1 etc etc. In another words it would hit one disk, then another disk, then back to disk one to fill the file evenly. Is there any way to make SQL Server distribute the writes out in parallel so that both disks are writing in tandem?
By the looks of it, multiple disks only scale reads, as with writes only one disk is ever written to at once which is annoying. Any way to harness the write power of multiple disks?
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Apr 8, 2007
Hi all (newbie @ asp.net)(oldie @ ASP 3)What is the purpose of using an attached MDF database files in the App_Data folder on a web site as to importing it into the SQL server directly or creating it on the SQL server. Does a mdf database attached file purely use the SQL server as a connection interface.Is it something similiar to DSN(ODBC) Connections for ms access databases.
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Mar 1, 2006
how can i attached MDF file only without .log and data only
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Jan 10, 2006
Hi,
I was trying to figure out how to back up a database that has been attached to the SQL Express instance. I found on the web this tutorial and tried to use it, however it seems like it cannot find the database. The DB is attached by the web application using AttachDbFilename in the connectionstring.
http://www.sqldbatips.com/showarticle.asp?ID=27
Any ideas?
thanks
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Nov 11, 2007
Hello all,
I'm using SQL 2005 Express edition. I'm currently connecting to the database file directrly (from ASP.NET) and that db file is not attached to the server.
My question is this:
What is the difference ? Will the performance improve if the db is attached and I connect to it throught the server ? I'm really not sure what the difference is.
Thanks
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May 25, 2008
Hey!
I need help getting all the users that are "attached" or "allowed" to access a given database and their login information. I do not know if this is even possible but I had tried to do my own research and cant figure it out/find any info on it. Any help is greatly appreciated!
Thank you!
-Teenprogrammer
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Feb 27, 2008
I attached my database to SQL 2005 but it's showing up as read-only for some reason. I've attached this before just fine in another instance of the Vista OS. Why would it attach differently this time compared to all other times and show read only?
The .mdb and .ldf files are not read only if you right-click and check out their properties.
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Nov 11, 2007
Hello all,
I'm using SQL 2005 Express edition. I'm currently connecting to the database file directrly (from ASP.NET) and that db file is not attached to the server.
My question is this:
What is the difference ? Will the performance improve if the db is attached and I connect to it throught the server ? I'm really not sure what the difference is.
Thanks
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Mar 23, 2007
Hello,
I was using a SQL Express database for some time now with no problems for a NUnit Test project. No, all of a sudden, I'm getting these problems:
DatabaseProviderTest.TestContainsUser : System.Data.SqlClient.SqlException : Cannot open user default database. Login failed.Login failed for user 'XXXXXX'.
For the SQLEXPRESS database, I checked and I am a user, and I gave myself every permission imaginable. The default database is master, so I don't know why I am getting this problem?
Any ideas? Thanks.
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May 27, 2007
Hi allI have a question concerning sql database mdf files. In the old days I would user a ms access database. This file would be stored with the actual web files and would utilise a dsn connection. I have noted when designing with vwd 2005 express it allows you to use 2 methods of creating a mdf database. You can either create it as an attachment mdf or you can create it directly using sql manager. My question is, if you create the mdf database as an attachement file can you store it in the same manner as if you where using a ms access database, meaning can you store it with the web site's files so it uses the file storage allocated size and then create a connection similar to a dsn (but for sql) to the isp's sql engine or does it have to be uploaded to the isp' s sql server.The reason for this question is some of my customers do not want to pay the extra cost to have an sql allocation, however I do not want to go back to using old asp methods to create advanced sites as I prefer using stored procedures. Any help will be appreciated
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Jan 9, 2008
Why in the hell doesn't SQL Server provide a facility for dropping anactive connection on an attached database in SQL Server Managementconsole? I can't detach an attached database because apparently thereis an active connection.I know you can use SSEUTIL but it seems like kluge for a poorlythought out function.Crazy
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Mar 8, 2007
I am supposed to be documenting the SQL Express 2005 SP2 installation and connection to our application on Vista. I have installed and uninstalled the application several times in trying to create the connection and document the process. I thought I was done but now the database will not attach because it thinks the databasse is already attached. The database is not attached. I even uninstalled it again thinking something was left over.
Among the possibilities are that the database we are trying to attach is from SQL Server 2003 on a Server 2003. I tend not to think it is a server issue but have no reason to make that statement.
I tend to think it is a Vista issue because I have encountered and circumvented several. Our applications work fine on the full version of SQL. I can connect my Vista computer to the servers without issue. We have no Vista Servers other than the workstation I am trying to get SQL Express running on.
I am about out of ideas. Any suggestion will be tried at this point. Brian
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Oct 24, 2006
Hello,
In my vb.net application, I have an attached database called dbMaster with the following tables:
tblCustomer, tblProducts, tblUsers
In visual studio 2005, is it possible to publish only one table? My problem is, is that I want to send my end users updated data from my tblCustomer, and am finding that on my test laptop, if I publish dbMaster, it sends all tables when I just want one to be sent.
Thanks in advance.
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May 17, 2015
Is it possible to try repair a database without being attached, giving the path to the files?
I'm trying to attach a database that i recover from a disk, and i'm not able to attach, gives me an error, saying i should do a db check.
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Dec 25, 2007
Hi every body.
As you can see in the title I would like to import my tables from the data base which is in the SQL Server, to an mdf file which can be attached to the project.Can some one give an indice please?
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May 14, 2013
Tran Backup failed. How to find the database for which Tran Backup failed as attached?
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Jul 29, 2015
our clients have the flexibility to detach and attach databases (I know there are a lot of considerations around this but there is now way of changing it), once they attach a database we need to run some code to update a bunch of values in the database.
Other than creating a SQL Agent job are there any other options available to automatically execute a script once the database has been attached?
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Dec 11, 2007
I downloaded the SR2 - major mistake Now I cannot get into the sample databases I have on my machine. I can attach to the Servers, but they have SR1 and now I guess if I would make changes from my SR2, then they will be screwed up.
My error when I try to log into my machine (adventure works) is:
TITLE: Connect to Server
------------------------------
Cannot connect to LND620JORRIT.
------------------------------
ADDITIONAL INFORMATION:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) (Microsoft SQL Server, Error: 2)
For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&EvtSrc=MSSQLServer&EvtID=2&LinkId=20476
------------------------------
BUTTONS:
OK
------------------------------
Is there any way to reverse SR2? Should I reinstall SQL 2005?
Help!
Anke
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Nov 24, 2006
Hi guys, can I know the steps on creating a database snapshot on a mirror database? Thx for the assistance. :)
Best Regards,
Hans
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Jun 20, 2007
Hi
I seem to have a strange problem when applying a snapshot when the tables in the publication have been updated while the snapshot was being generated.
Say for example there is a table called RMAReplacedItem in the publication. When the snapshot starts being applied to the subscriber, a stored procedure called sp_MSins_RMAReplacedItem_msrepl_css gets created that handles an insert if the row already exists (ie it updates the row rather than inserting it). However, after all the data has been loaded into the tables, instead of calling this procedure, it tries to call one called sp_MSins_RMAReplacedIte_msrepl_cssm - it takes the last letter of the table name and adds it to the end of the procedure name.
The worst part is that this causes the application of the snapshot to fail, but it doesnt report what the error is, and instead it just tries applying the snapshot again. The only way i have managed to find which call is failing is to run profiler against the subscriber while the snapshot is being applied and see what errors.
I have run sp_broswereplcmds and the data in there is what is applied to the subscriber - ie the wrong procedure name.
All the servers involved are running sql 2005 service pack 2. The publisher and subscriber were both upgraded from sql 2000, but the distribution server is a fresh install of sql 2005.
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Feb 28, 2008
I have a mirred database and have snapshot created from the mirroed database. I can do data selecting from the snapshot. But when the pricipal server is down , I can re-active the mirroed database.( I did succesfully upto this). Then I need to restore the database from snapshot and which failing with following error message.
Code Snippet
Msg 5123, Level 16, State 1, Line 3
CREATE FILE encountered operating system error 3(error not found) while attempting to open or create the physical file 'E:sql_datadevitst_mirrorlog st_mirror_log.ldf'.
Msg 5024, Level 16, State 2, Line 3
No entry found for the primary log file in sysfiles1. Could not rebuild the log.
Msg 5028, Level 16, State 2, Line 3
The system could not activate enough of the database to rebuild the log.
Msg 3013, Level 16, State 1, Line 3
RESTORE DATABASE is terminating abnormally.
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Mar 21, 2002
Are there any issues with installing SQL 2000 on a server with Dynamic Disks configured with RAID 1 Mirroring ? I know that with Dynamic Disks there are no partitions but rather volumes. Is the drive configuration setup the same way ?. Would I setup a volume for the O/S and a volume for SQL ? The reason I need to use Dynamic Disks is because we will be integrating it later with an EMC SAN solution.
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Oct 26, 2007
Can both be used with SQL server ? Dynamic disks provide more flexibility, is there performance imact ?
Thank you.
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Apr 17, 2007
Hello,
I have a two node SQL 2000 cluster running on windows 2003 enterprise server. We need to replace the SAN disks. Can we not disable SQL service & Cluster service, copy the contents from existing disks to target disks, swap the drive letter & start the services?
What is the best practice to do this? Appreciate your help.
Thanks
Rajan
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Nov 8, 2007
I have a new server.
It was shipped with a 76 gig drive setup in RAID 1 (2 disk) and a 400 gig drive setup in RAID 5 (4 disk).
I would like to determine what is the best way to setup up the partitions. What size and what should be placed on each.
Like the C: Drive...Should I just put Windows on there and nothing else? Do I stand to gain something from not using part of that 76 gigs as a D: drive for my apps?
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Jan 31, 2008
Hi...
Why is it that I encounter an error during execution of database snapshot i SQL Server 2005 Standard Edition. It says that database snapshot is not supported under standard versin. Is this true?
Thanks.
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Dec 18, 2006
Need some help, i have some database snapshots files provided from an external source. Need to be able to understand how i get them back into a database format if possible.
Files for example are table1.bcp, table2.bcp with als a file called scheme.sql which sets up these tables in sql but does not populate them. Nothing else was provided except a .vcd file which i dont know whtat its for.
any clues?
Dan
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Feb 27, 2001
Any help appreciated!
Is there any performance enhancements to be gained by storing frequently 'trigger-written-to' databases on a seperate disk to the source database? In particular, we keep a 'history' database of all inserts/updates/deletes against records, activated by triggers, and I was wondering if I would gain performance enhancement by locating the two databases on different disks?
Thanks in advance
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Mar 13, 2014
I am trying to build the 2 node 2 clusters with the AlwaysOn.
Here isthe landscape.
2 nodes PROD failover cluster (running once instance)
2 nodes DR failover cluster (running 2 instances - DR and PRE-PROD)
Both clusters are in different geographies.
PRE-PROD can be editable. So out of scope of Always On.
One instance on PROD -> DR of the other box. [Want to achive thru AlwaysON]
Now my Question:
1) Do i need to have all the 4 nodes in same failover cluster group? If yes, then this would become MultiSubnet cluster Or Is there any way those 2 diffrerent failover clusters (one DR and one PROD) can be part of AlwaysOn.
2) Can i use the clustered disks as in the above landscape for always on?
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Nov 2, 2001
Does anyone know of a script I can run to take a snapshot of a SQL server 7 database? If not what is the best way to go about getting a snapshot of the db?
Thanks!
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Oct 31, 2007
Hi everyone,
I am looking for a way to check to see if a database is a snapshot or not. You can for example check different properties of a database by running the following:
SELECT DATABASEPROPERTYEX('databasename','Recovery')
SELECT DATABASEPROPERTYEX('databasename','IsInStandBy')
SELECT DATABASEPROPERTYEX('databasename','Status')
So I am trying to see if there is a way to check for a snapshot
Thanks,
Reghardt
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