Many Databases Vs. 1 Database
Jul 23, 2005
Hi,
I am trying to determine what the overhead is per database in SQL
Server 2000 Standard. I have the option to put several customers in one
database, or give each customer their own database. I would like to put
each customer in their own database to simplify maintenance and
strengthen security.
I have found the following document which shows the memory used by
various objects in SQL Server:
http://msdn.microsoft.com/library/d..._ar_ts_8dbn.asp
Based on this info I get the following *additional* memory requirements
per database:
Open Database (1 file, 1 filegroup): 6k
Open Objects (250 objects, 30 indexes): 692k
Total: 698k
Is this an accurate calculation of the overhead? Is there something
else that would affect the overhead that I am overlooking? Are there
any other downsides to having many databases versus a few databases?
Thanks,
Mike
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Oct 26, 2007
Hi,
I want to share knowledge that we have the abality to merge the two databases in one database. As if your site is already working with data base with out login page. And you are using asp.net built in funtion to create login page there will be a new database will automatically generated with the name of "ASPNETDB.MDF". you will check it in machine.config. If you want to get its data in old one database you only open sdk dos promt and write aspnet_regsql.exe and press enter. A wizard will open for you. in first two wizard you click next without changing it. and in the 3rd page you will enter the database name in which you want to write this ASPNETDB.MDF data. and in the final page you click finished button and close the sdk dos promt.
You should go on web. config file and modify the code for example.<connectionStrings>
<add name="wordexpress" connectionString="server= localhostsqlExpress;Database=wordexpress;Integrated Security=True"providerName="System.Data.sqlClient" />
<remove name="LocalSqlServer"/>
<add name="LocalSqlServer" connectionString="server= localhostsqlExpress;Database=wordexpress;Integrated Security=True"providerName="System.Data.sqlClient" />
</connectionStrings>
And then check your old database you will see that there is new 11 table added.
My question is that I cannot get these table in my old database. I have working with the same procedure. Can any one tell me if there is any mistake from my side.
Naveed Baig.
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Jun 20, 2006
I need to design a system which represents multiple "projects" in SQLServer. Each project has the same data model, but is independent of allothers. My inclination is to use one database to store all projects.Looking at the numbers involved, however, I wonder if I would getbetter performance by storing each project in its own database.Suppose I have 50 projects, each with two users and 10,000 rows; itseems to me I'd rather have 50 x 2 users working in a table with 10,000rows than 1 x 100 users working in a table with 500,000 rows.On the other hand, the single database approach seems more elegant froma design perspective. I wouldn't be creating multiple copies of anidentical data model, and I wouldn't be creating new databases as abusiness procedure, every time a new project is required.Here are my questions:1. For the scenario described above, am I correct to assume I will getbetter performance by using multiple databases, or does SQL Server havesome clever way of achieving the same performance in a single database?2. Is the multiple database approach common? If anyone has tried it,please tell me about how it works in practice.-TC
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Oct 14, 2007
Hi, everyone!
I have the following problem:
I want to process a cube daily via remote connection (http://cubeserver/olap/msmdpump.dll), using a Script Task in a SSIS package.
1. Running the package with the Execute Package Utility works fine, the cube will be processed.
2. With this SSIS package I created a job that runs daily and everything was fine until 3 weeks ago. Since than I have the following problem:
SSAS Server is connected:
oServer.connected=True
,but further I find no database:
oServer.Databases.Count=0,
although there is at least one database.
Of course, running the package with the Execute Package Utility:
oServer.Databases.Count=1
and I can go on with the processing.
I used in both cases the same Package and the same configuration file, the connection string is the same.
Both computers run SQL Server 2005 SP2.
I truly appreciate your help,
Cristina.
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Nov 8, 2006
Hi ...
I have two separete databases, what Ineed is that I want to make a single database of the two. Although all the table definitions of both the database are same.
I will be glad to know "how to make a single database from two" and i will be happy to see the query to insert the values from one database to another one.
Abdul Ghaffar
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Jan 14, 2004
Hi,
I'm trying to list all database locations with SQL command, but getting lost here :(
So, anyone any idea how to get databasefile locations from server?
All I need is like: 'C:Program FilesMicrosoft SQL ServerMSSQLDatamaster.mdf' and others.
Thanks.
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Jun 5, 2015
Script only displays the result for 'Master' database.Â
What changes are required for script to display result for all databases on the instance?
SELECT DB_Name() AS DatabaseName, OBJECT_NAME(ind.OBJECT_ID) AS TableName,Â
ind.name AS IndexName, indexstats.index_type_desc AS IndexType,Â
indexstats.avg_fragmentation_in_percentÂ
FROM sys.dm_db_index_physical_stats(DB_ID(), NULL, NULL, NULL, NULL) indexstatsÂ
INNER JOIN sys.indexes ind Â
ON ind.object_id = indexstats.object_idÂ
AND ind.index_id = indexstats.index_idÂ
WHERE indexstats.avg_fragmentation_in_percent > 30 and indexstats.page_count >1000
ORDER BY indexstats.avg_fragmentation_in_percent DESC
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May 30, 2006
I am trying to enable database mirroring for 100 database.
It goes error free till 59 databases (some times 60 databases) with the
status (principal, synchronized) on principal. on the 60th or 61st database
it gave the status (principal, disconnected). Also mirror starts acting
abnormal. connection to mirror starts to give connection timeout and it is
not enabling database mirroring on any more databases. I have SQL SERVER
2005 Enterprise with SP1 on the servers. witness is not included yet.
this are my test servers... i have more than 500 databases on my production
servers.
principal and mirror both are using port 5022 for ENDPOINT communication.
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Oct 30, 2014
I just finished installing SQL Server 2012 with the SQL Server Replication feature component checked. On configuring transaction replication, i notice the distribution database wasn't there. I ran the below query
EXEC sp_get_distributor And the value for distribution_db_installed is 0 as shown below
installed distribution server distribution db installed is distribution publisher has remote distribution publisher
0NULL000
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Aug 13, 2015
We have our replication environment with a separate SQL 2014 publisher, distributor and subscriber. We have a table named DPSP on 14 databases which is to be published via transactional replication to 1 subscription database.Â
The source tables are identical in name, schema and clustered index. We have created 14 tables in the subscription database with a suffix to the name (see below):
Â
Each table in the subscription database has its own uniquely named primary key and clustered index:
Below are the settings for one of the published article:
The same process is repeated for each DPSP table created in 14 separate publications. Snapshots are generated and subscriptions created successfully. After some time, the log reader starts to show the following errors in replication monitor:
2015-08-12 21:48:24.156 7 transaction(s) with 11 command(s) were delivered.
2015-08-12 21:49:04.233 5 transaction(s) with 7 command(s) were delivered.
2015-08-12 21:50:04.355 No replicated transactions are available.
2015-08-12 21:50:09.378 13 transaction(s) with 17 command(s) were delivered.
2015-08-12 21:51:12.168 No replicated transactions are available.
2015-08-12 21:52:12.306 No replicated transactions are available.
2015-08-12 21:52:32.337
[Code] ....
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Aug 3, 2007
Hi,
Currently we have a variety of SQL 2000 (and 2005) database servers, we are having issues with the maintenance plan of a few SQL2000 boxes where they no longer have enough hard disk space to do a full index-rebuild on the system.
Now we want to re-build the databases indexes approximately once a week, or maybe a little less often, in the past this has worked fine with maintenance plans.
However, we now have issues because we have some databases in offline mode, and we are quite low on disk space with no plans for hardware upgrades anytime soon.
The temporary solution is to turn the index rebuilds off.
I have been working on a script that will:
Cycle through each database and within that database:
Go through each table
Run a DBCC DBREINDEX on the table
Move on to the next table
Once the reindexing of one database is complete
IF the database is not in simple mode
Backup the transaction log
Run a DBCC SHRINKDATABASE with the required amount of free space
Go to the next database until all are complete.The logic is quite simple but so far this has not worked, it would appear something is locking the transaction log until the script exits.
Now the script works fine excluding the shrinkdatabase, I always get:
DBCC execution completed. If DBCC printed error messages, contact your system administrator. [SQLSTATE 01000]
Shrinking database: inf_dev target percentage: 10 at: Aug 2 2007 5:33PM [SQLSTATE 01000]
Cannot shrink log file 2 (INF_PROD_Log) because all logical log files are in use. [SQLSTATE 01000]
Where I'm indexing the INF_Prod database.
A DBCC LOGINFO shows something along the lines of:
Code Snippet
BACKUP LOG successfully processed 45162 pages in 152.607 seconds (2.424 MB/sec). [SQLSTATE 01000]
FileId FileSize StartOffset FSeqNo Status Parity CreateLSN
----------- ---------------------- ---------------------- ----------- ----------- ------ ---------------------------
2 253952 8192 29618 0 128 0
2 253952 262144 29621 0 64 0
2 253952 516096 29620 0 64 0
2 278528 770048 29619 0 64 0
<cut cut>
2 9043968 370737152 0 0 0 29800000001528500007
2 9043968 379781120 29802 2 64 29800000001528500007
2 9043968 388825088 29801 0 64 29800000001528500007
Clearly there is something in the log file towards the end.
However, I don't know why this is happening as I'm running the script in the master database and I've backed up the transaction log of the database I'm working on.
I've tried doing Full backup + Transaction log + Shrink, it fails.
I've tried waiting 10minutes in the script + shrink, it also fails.
However, if I open a query analyzer and do a backup log, then a shrink it works perfectly every time.
However in the script it always fails no matter what I do.
Where am I going wrong here?
Regards,
Gareth
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Aug 13, 2015
In our production we have a database by name MyDb.The application team wanted another database by the name MyDbOld which contains the data of Mydb 1 month old. So I created a database MyDbOld in other instance(test) and restored MyDbOld from the one month backup of MyDb in production server. In test instance I backed MyDbOld as MyDbOld.bak...
In the production instance I created a new DB by the name MyDbOld and restored the MyDbOld in the production from the backup of MyDbold.bak in the test instance. Now I have 2 databases in the production instance ie MyDb and 2)MyDbOld. However I find the logical names of both the databases to be the same although the database name and the physical file name to be different.My questions are-:
1) Does it in any manner affect the integrity of the 2 databases if the 2 databases are in the same instance and have the same logical name?
2) Would the dml or data retrieval operations in the 2 databases have any conflict in any manner what so ever?
3) Having a unique database name, and unique file names for the physical files for any database in an instance what is the purpose and significance of additionally having a logical name for a database?
4) Which I could restore a database from the backup of another database in the same instance and at the same time change the logical and physical name of the files to correspond to the new database.
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Jun 1, 2006
I am trying to enable database mirroring for 100 database.
It goes error free till 59 databases (some times 60 databases) with the
status (principal, synchronized) on principal. on the 60th or 61st database
it gave the status (principal, disconnected). Also mirror starts acting
abnormal. connection to mirror starts to give connection timeout and it is
not enabling database mirroring on any more databases. I have SQL SERVER
2005 Enterprise with SP1 on the servers. witness is not included yet.
these are my test servers... i have more than 500 databases on my production
servers.
principal and mirror both are using port 5022 for ENDPOINT communication.
All of the databases are critical and all must be included in the Database Mirroring.
so, after that I tried to implement database mirroring again......
System has 3 GB of RAM, SQL SERVER (Mirror) using 85 MB of RAM but still
giving this error while trying to enable database mirroring for 37th
Database.....
"There is insufficient system Memory to run this query"
WHY?
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Jul 31, 2007
Hi,
I accidentally populate tables into System databases/master database. What should I do? Should I delete all the tables I populate in mster database?
Thank you very much!
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Jan 7, 2008
Hi,
I have two databases lets say DB1 and DB2.
Schemas for both databases is same.
In both database schemas there are tables which has identity columns as primary key.
Now i want to merge these two databases in a single database say DB3.
It may also possible that some master records in both databases are common so they should not repeat in DB3
Is there any way so that i can do it quickly and as soon as possible.
Thanks in advance
Rohit
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Oct 27, 2015
I have a 2 node cluster having 4 cores each wherein having 3 instances of SQL 2008 R2 enterprise comprising of 60 databases, 20 on each instance. I need to setup mirroring for each of the databases to a secondary server having 4 cores and 3 instances. What i understand is that in this case the mirror server will be providing max of 512 worker threads and the 60 mirror databases would consume 240 threads.what all needs to be checked for looking into the feasabilty of going ahead with a async mirror setup as mentioned above.
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Jan 31, 2008
Hi,
How would I set permission for SQL Server 2005 "User A" to prevent access to System and other user databases, also How to hide the databases that "User A" has no rights to. I mean, when User A logs in, All other user databases are not visible to him/her.
Thanks,
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Mar 7, 2008
I want to customize database maintenance to run only on selected databases based on their status in sys.databases, without having to statically select them in the GUI.
I'm trying to write an SSIS package that will do the following:
1. Query for a list of databases that are not read-only or recovering, etc.
2. Perform database maintenance tasks (e.g., rebuild indexes) on those databases.
I'm doing this because the database maintenance tasks do not provide a way to select databases based on criteria or a SQL query filter.
My package includes an Execute SQL task to get the list of databases, a Foreach loop container to loop through the databases, and then...this is where I get stuck. I can't use the existing maintenance tasks (Rebuild Index, Update Statistics, etc.) because I don't know how to provide an input variable for the list of databases. I'd rather not write dynamic SQL to generate commands for each database object.
Does anyone know how to do this?
Thanks much.
David
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Nov 9, 2007
I have moved my databases to 2000 to instance of 2005 on the same server.
Now i set databases offline in 2000 as i did upgrade use backup & recovery method.
& my connection string
Password=test;Persist Security Info=True;User ID=test;Initial Catalog=databasename;Data Source=ipaddress
i was using above connection string to connect when using 2000 databases form applications in the production machine
I get the following error when i am running my applications now after moving to 2005
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)
IS it because i have two server on one server or
What do i need to do in order to fix this....tried several thing by searching nothing worked out..
Let me know
thanks
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Jun 23, 2007
Hi, I have compact sql databases which will be local on multiple users
devices. Due to space constraints, for one of the tables i have had to use
auto incrementing integer which works fine for the local database but i
would like to merge all of the users databases into a global database. The
table format can be seen below:
Code SnippetCREATE TABLE Players
(
ID UNIQUEIDENTIFIER NOT NULL PRIMARY KEY,
FirstName NVARCHAR(32),
LastName NVARCHAR(32)
);
CREATE TABLE Sessions
(
ID INTEGER NOT NULL IDENTITY,
PlayerID UNIQUEIDENTIFIER ,
SessionDateTime DATETIME,
CONSTRAINT pkSessions PRIMARY KEY (ID),
CONSTRAINT fkPlayerID FOREIGN KEY (PlayerID) REFERENCES Players(ID)
);
CREATE TABLE SessionDetail
(
SessionID INTEGER,
Time real,
Power real,
CONSTRAINT pkSessionDetail PRIMARY KEY (SessionID,StrokeTime),
CONSTRAINT fkSessionID FOREIGN KEY (SessionID) REFERENCES Sessions(ID)
);
The Players table will merge fine as GUIDs are used. However, how will the
sync capabilities of compact SQL handle the sessions table? When it pushes
the local data to the remote database will it change the Sessions.ID column
to a unique field (as no doubt lots of people will have 1, 2, 3 in their
local databases and the global database must have a unique ID), and then
transfer this changed ID back to the local database? Furthermore, if it
changes the Sessions.ID column during the merge it will also need to update
the SessionDetail.SessionID foreign key to maintain referential integrity,
is this also handled?
So my question is, how much of this sync and data merge is automated and are
there any good examples or pointers for my scenario? I cannot reasonably use
a GUID for Session.ID as there will be lots of SessionDetail entries and the
size would be far too much.
Many thanks,
Chris
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Oct 19, 2015
script to get the list of views in a database, involving tables from other databases?I AM using SQL server 2014
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Dec 10, 2007
Dear Readers,Is it possible, like in Access, to link to tables in other SQL databases that are on the same server? I have a query that I originally had in Access that queered from multiply databases. It did this by having those other tables in the other databases linked to the database that had the query.
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Oct 18, 2013
I have system database and user database file are present in G,H and W drive.The process is going to be - copy data from G to S, H to T, W to U. Rename G to X, H to Y and W to Z. Rename S to G, T to H and U to W. Reboot the servers. The original G, H and W will then be X, Y and Z. The old S will be the new G, old T will be H and old U will be W. My question is that after doing this whether my SQL server will start or not
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Jan 24, 2006
I just restored my SQL server 2000 database on the SQL server 2005. after this i ran the Service broker sample ("Hello World") on this database by changing the AdventureWorks name to the new database name. The "setup.sql" runs fine. When i run the "SendMessage.sql" i was not getting any rows in the output (The message was not getting inserted into the queue). I checked the Service broker is enabled on this databased using the query "select is_broker_enabled from sys.databases where name = 'newdbname' " It was 1. I even tried the ALTER DATABASE SET ENABLE_BROKER. but it didnt work.
When i tried the sample on a newly created database it worked fine.
Is there any solution to make the restored database to work for service broker.
Thanks
Prashanth
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Apr 1, 2008
I'm in the middle of developing a Database for a hospital that measures its audits, inhouse operations, and finance. What we currently have and do everyday is collect data from a large database that is real time with patient data, progess, infomation, etc and dump it into a data warehouse that runs on TSI/Eclipsys. We run reports using a number of programs and dump it into Excel sheets that have charts, reports, etc. This Database for which I'm developing won't come soley from the TSI/Eclypsys source, but this is the only source thats updated regularly. I don't want to have in sync with TSI/Eclipysys in fear that every day when it updates data may be lost, not read, or worse won't be up date if there is a problem. My question is is it possible to run a query from Sequel Server 2005 that will take that data upon request using the reporing features on Sequel Server 2005. i.e. What if I need to run a report on measure B in department 12 from Jan 1-Feb 1, instead of being in sync, can I just write queries to take that information rather than double the data and take up twice the space and trouble. FYI, these datatypes rarely change in the TSI/Eclipsys data warehouse. This sure was long question and didn't intended it to be . Thanks for listening and hope to hear back.
Stephen
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Sep 13, 2007
Hi,
I'm trying to create a database that takes specific information from a number of databases on different servers to make some reporting that we have much easier.
I'm pretty new to SQL so I'm not sure of the best way to proceed. I read an article that suggested I use the OPENROWSET command. The problem is, the version of SQL that came with one of the programmes we use is limited and will not allow you to turn on the allow "Ad Hoc distributed Queries" so the SLQ statement will not execute.
I'm confused why it won't let me to connect through ODBC as I've created a web page that selects data from this database with no problems!
Here is the SQL statement that I've written to make sure it is the correct one (on the msdn library page it said that this was the ODBC connection):
SELECT a.*
FROM OPENROWSET('MSDASQL','DRIVER=(SQL Server);SERVER=APPOLOACT7;UID=sa;PWD=***************',
'SELECT * FROM MDCTestAndDev.dbo.TBL_CONTACT') AS a
I've also created the ODBC connection using the tool on Administration Tools>Data Sources ODBC
Any help would be greatly appreciated (also any ways of selecting from one database and inserting it into another will be helpfull)
Thanks
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Feb 8, 2000
hi from France !!!
i would like how to duplicate a database to another server with all datas, constraints, keys, indexes...
should i use sp_attach_db, dts, backup/restore, sql scripts... ???
thanks to all, nico
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Mar 13, 2007
This is the scenario. Is it possible to create views or something (like Oracle DB Links) in a database in Instance 1 which can show data from another database in 2nd Instance ?
I want to do this to create reports.
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Sep 24, 2006
I have created a site which now has two databases. Firstly is the ASPNETDB.MDF which I beleives get set to manage the security, logon/Roles that I have on my site. The second dataabase "MyDatabase" is one that I have created for all my data withing the site. I would like to combine this to one Database for simplicity and cost. Now I can't see the ASPNETDB.MDF when I use SQL Manager 2005 and I can't see how to change the set up of ASP.Net Configuration if I was to just use mydatabase. Any suggestions
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Sep 25, 2006
Hi, I have my site set up, but have had difficulty using the data gathered by the aspnet.mdf. I wanted to use the email and username columns from the membership table to send newsletters automatically from the database(but that's a whole other post)I also have my own databse, which will be populated by information gathered from the website, so is currently empty. I'd like to take this opportunity to say that i don't think there's enough information given on how to populate a blank database from a website application. Most tuorials etc are concentrated on retrieving and displaying data, which is all well and good, once you actually have data to play with!I don't need two databases, so can I add tables to the aspnet.mdf ? But then what about relationships etc? I won't damage the current relationships by adding new ones? On the other hand can i copy the aspnet.mdf into my own database, and then assign the relevant permissions to that db? Any help would be greatly appreciated-in language for newbies please! I am relatively new to .asp.net/Visual Basic/ and SQL. It's a steep learning curve!Also....I have used create user wizard, login, password recovery etc within my site, the data is inserted into the correct db tables-without using an sql datasource for some reason...? is that right?I have also created a wizard to collect some more data (because i couldn't work out how to insert the data from the extra steps in create user wizard, into my own database) but when i click submit the data is not inserting into the specified table - (yes the connection string is fine, insert and update has been selected from the advance tab in connections wizard). Would this/could this be because i have assigned a 'finishbutton url'? should i use a Response.Redirect("blahblah.aspx") instead?
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Nov 16, 2004
I am very new to asp.net, but am having trouble trying to link the asp.net page that i have created to an sql database that has been set up on a local system. Am actually trying to use the sql control to extract info from the database. Would appreciate any ideas.
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Jul 13, 2001
Dear friends,
There are two databases in SQL Server and I have to designed the view or store procedure joing tables from two databases. How ? It will be kind, if you give me answer with detail example.
Best regards!
manoj
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Jul 16, 2000
Hello,
I’m using VB6 as the client and MS SQL Server 7 as the database. The company I’m consulting for has a proven track record for marketing and getting millions of customers. The parent company would like to create two new companies selling the same product; with 1 million customers per company. How many records can MS SQL Server 7 handle? I’ve been told it can handle 4 terabytes. What does 4 terabytes translate into records? I have already set up an application for company #1. Should I put company #2 in the same MS SQL Server database? Or should I put company #2 in a different database? My VB Application and SQL Server database were designed to handle multiple companies selling the same product. For performance sake; would it be better to separate the databases? Any suggestions? Is anyone currently using MS SQL Server with 2 or more million records?
Thanks,
Denise
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