How To Keep Several Databases Synchronized???
Oct 20, 2000
I have a question about synchronizing databases. Let's say that I have 2 SQL Server 7 databases on 2 different computers running SQL Server 7.
The databases contain various related tables and are used to mange subscribers, contactpersonell and other data. In the databses subscribers are added, deleted and updated frequently so my problem is to keep the 2 databses that are located on different computers synchronized. If a subscriber is deleted on one computer, then it should be deleted in the other database too etc. These subscribers are identified by a subscriberID.
Is it possible in some (easy) way to do this synchronization?
And how should I specifiy where the databases are located so that my stored procedure (or whatever does this) knows where the databases and tables are located? I mean, if the databases are located for example in 2 different cities.
Thanks for all help!
Regards, Bob
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Jul 23, 2005
I'm running a SQL 7 db on a LAN in city A with other users accessing it fromanother city (city B) over a WAN. Obviously the WAN users are getting muchslower access to the data. One thing I was wondering was if it was possibleto have two versions of the database, one on each server, and have themautomatically synchronize as users at each location make changes. Or, ifthat's not possible, then at least have the city B users get any changesthat the city A users get as they are made.Thanks for any input.Neil
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Feb 9, 2007
I use SQLCE2.0 and merge replication.
Is there a way to query SQLCE to find the time of the last synchronization without manually tracking the time myself.
Thank you.
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Feb 23, 2015
I have two server A & B and I have always on high availability turned on SQL14.
I need to shrink the log on server A and it's fine if it also needs to shrink B.
My problem is that when I run my shrink command I get:
"cannot be shrunk until all secondaries have moved past the point where the log was added.."
I think I need to drop the High availability on the servers and then run this:
USE iTest2_Claims;
GO
ALTER DATABASE iTest2_Claims
SET RECOVERY SIMPLE;
GO
DBCC SHRINKFILE (iTest2_Claims_Log, 10);
GO
ALTER DATABASE iTest2_Claims
SET RECOVERY FULL;
GO
If the only way to shrink my log file is to drop high availibity how do I do that in script? and how risky is it that the high availaibity will not re-connect?
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Sep 20, 2015
We have a situation that requires converting all INT columns from source database to BIGINT in destination.
By ‘copying’ term, I consider any operation like insert-select, merge, asynchronous replication or any other that will get all data synchronized until some moment in time, i.e. 2015-12-31 10:00 PST when downtime is planned. Before that moment it isn’t important if data in source and destination DB are in sync.
Copying process starts early enough to allow appliance of any technique/technology – there’s enough time to find best solution.
Requirements:
1. Destination database is superset of source, having all tables and all columns plus few more columns in few tables. Additional columns have default NULL or they are computed. INT columns in source are BIGINT in destination.
2. If source and destination are not in sync at the moment downtime begins, it is allowed to have few minutes to wait for synchronization. For instance, if transaction logs from last hour or so need to be shipped, that would be ok. If large table need to be synchronized by comparing row-by-row, it’s not ok.
3. Source database performance must not be compromised by any copying if it’s done before scheduled downtime. There are couple of options I have in mind involving MERGE command but its appliance might be limited by current DB design. Additionally, based on business logic, I cannot be absolutely sure if some row, created while ago, wasn’t changed meanwhile.
For some large tables, there is no indicator at all when any row has changed – I cannot rely on IDs nor there is column like ‘[date last changed] DATETIME’
I have been reading about various kinds of replication, i.e. log shipping but I’m not clear if any of these is applicable. Key points, if there is replication involved, are copying process must start from empty destination database plus synchronization must not compromise source DB performance So, how to do this using any kind of replication?
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Nov 20, 2005
So in a previous thread I discovered that in order to actually subscribe to any publication, the publisher needs to be a well-known network name, requiring DNS resolution. You can't simply point a SQLExpress instance at an ip addressinstance and have it resolve the communications.
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Sep 25, 2007
SQL Express 2005 with one instance on a networked dedicated stand-alone window XP€¦
We use this for custom software written in VB.net. We are not SQL experts€¦
Question 1) I am getting a event viewer warning that says
The time stamp counter of CPU on scheduler id 1 is not synchronized with other CPUs.
This seems strange, since there is only one CPU on this machine. Any ideas?
Question 2) In SQL Server Management Studio Express, we do not have the actual data files attached to the instance, but the custom program does use the actual data files just fine, defined by the connection string. Is there any pro/con to having them attached in SQL Server Management Studio Express?
Thanks!
Bob
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Feb 23, 2008
Hi,
Get some errors in my log, does anyone knows how I can turn off all logging?
Indeed error should be investigated, but for the moment I just need to turn off all loggings.
Cheers!
Rickard
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Feb 17, 2007
64 bit sql 2005 - SP2 CTP is creating several of this messages in the log. Could somebody tell me what is the impact of these on the performance?
Also, could anybody from MS have any idea as to the release date of SP2 ( Non CTP)
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Aug 12, 2015
I wonder how do I shrink log file in a specific database which in Mirror/Synchronized/Restoring state..So that database is in Mirror server ( High availability ).
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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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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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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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Aug 3, 2000
I am presenting using MS SQL 6.5 and have used up all my (VDEVNO) device numbers (1-255). Will I have this problem when I migrate to SQL 7? I understand SQL 7 does not use a device when creating databases, so what
is the maximum number of databases I can create in SQL 7?
Thanks in advance.
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Apr 9, 2005
Gusy im currently making and app that runs from a cd rom yet it uses databases made in sql and i already made the part for ataching the database from the cd but i haven't been able to do 2 things:
1. Can i actually attach my database from a cd without any need for the computer
2. does anyone has the code for detaching a database in Sql in c#
thanks ahead
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Jul 30, 2004
How can you make two databases communicate with each other?? they both reside in sql server 2000. How would I go about doing that. Access 2000 is the interface
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May 21, 2004
Hello,
Is it possible to restore a 6.5 database to a 7.0? I backup the entire 6.5 database to a BAK file then tried to restore it to SQL 7.0 but it didn't work. SQL 7.0 states that the disk device is not a valid Microsoft Tape Format backup set.
We have an application that was developped long long time ago by a old team and I don't want to upgrade the server. I tried to build a second 6.5 server (new hardware) but I couldn't restore the database as SQL 6.5 states that the server is in single user mode. I don't know how to switch to multi users mode. The database I want to restore is not in DBO or single user mode.
Any help will be appreciated.
Thanks.
Toan.
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Mar 16, 2006
Hello,
Can someone show me the TSQL I need to write in order to create 100 SQL databases in one go.
I want them to be called DB1, DB2, DB3, DB4...etc etc
I know how to create one database;
---------------------------------------------------
USE MASTER
GO
CREATE DATABASE DB1
ON PRIMARY
(
NAME = DB1_dat,
FILENAME = 'C:Program FilesMicrosoft SQL ServerMSSQLDataDB1.mdf',
SIZE=4,
MAXSIZE=10,
FILEGROWTH=1
)
-------------------------
But I don't want to do this 100 times,
Thanks in advance
ICW
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Feb 10, 2007
i really want to know,there are how types of databases?how many types of servers?how many types of inernet based languages?
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Jul 20, 2005
Hello,I am currently looking for databases that contain available prescriptionmedications and diagnosis codes (i.e. ICD9 medical diagnosis codes) thathave been created using SQL.Anybody know of companies that have these commerically available?Thanks,Eric
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Oct 20, 2007
I'm writing an app in vs2005 using sql express. This may be the wrong forum for this question, but here it is. I'm going to have several tables: Seven for Customer information, six for Employee information, 15 for Misc Definitions (status types, skill types, discipline types, gender types, etc.) and 10 for Scheduling information. This is a total of 38 tables.
Is there any advantage to having four databases, one for each type, or should I put all 38 tables in one database and add relationships to everything?
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May 28, 2007
Hello Everyone:
I am testing SQL Sever Express and I would like to know how to load the adventure works databaes into SQL server? I have downloaded the files in accordance to the instructions providered however, when I open SQL Server the Adventure Works database does not appear. How do I add the adventure works database to my instance of SQL Server? It appears that the files downloaded correclty and teh setup executed correclty, and the database files can be found in my control panel.
Thanks
John
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Jun 20, 2007
How do I join tables from two separate databases in SQL Server 2005 reporting services?
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Jan 22, 2008
I have assembly with several UDT. Let's call one of them - T. I have loaded assembly to 2 different databases. Let€™s call them €“ d1 and d2. I also have function F(), that returns type T.
I want to run such statement:
use d2
declare
@v t = d1.dbo.F();
If type T in d2 lies in schema dbo, then such statement will work without any problems. But if I want to register T not in dbo, but in some other schema (let€™s call it S), I will have an error:
Msg 206, Level 16, State 2, Line 1
Operand type clash: sysdb.ssma_oracle.Record is incompatible with t1.ssma_oracle.Record
Only conditions for CLR UDT, that I found, were:
When you use user-defined types across databases, you should remember the following:
· The types must have the same name, including the same CLR name, and must be implemented through the same assembly in both databases. Assemblies in two databases are identical if they have the same name, strong name, culture, version, code access permission set, and binary contents.
· You must have SELECT and EXECUTE permissions on each user-defined type column referenced in the query. These permissions are checked with regard to the database in which each column is defined.
· If a type that is implemented in one assembly calls a method in another assembly, the cross-assembly call is checked in the same way as if the user-defined type query were issued without crossing databases.
But I still have the same error. Why?
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Aug 23, 2006
Hi
I'm a newbie to SQL server..... l'm building a website where companies can save important data. I have a SQL server available but I'm not sure how to store the data. Should I create a new database for every user or should I store everything in the same database and then use a UserId to recognize the data and the user? What about the case where I reaches let's say 1000 users in the one user per database case, it would be extremly difficult to have an overview of the databases or what?
The data stored for each user are stored in tables which are exactly the same so all tables could be gathered into one table and then a UserId could tell which records belong to whom.
Hope my english isn't too bad..otherwise just ask me questions and I'll get back A.S.A.P.
Regards
Joachim
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Sep 16, 2006
Hi, I am developing a small asp.net application where I read from a readonly omnis database via odbc then dependant on user input write records to a second database.My first idea was to use an odbc connection to Omnis database and write to ms sql database. There is quite a few queries that need to be made to the Omnis database and I am binding a datagrid to the MS Sql server database. I was hoping to use stored procedures to update the mssql tables. So there will be much opening and closing of connections. Should I go down that road or should i think of using an Access database, with linked table to the Omnis database, then only one connection needs to be made. And I can store my information in the Access database tables. Thanks.
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Feb 22, 2007
I know enough about Databases to get myself in trouple. So maybe someone can point me in the right direction, or help me out. I work for the American Red Cross in Provo UT. We want to be able to put class registration on line so that someone can visit our website chose the class they want to take, register and pay for it all on-line. Our website http://www.redcrossut.org is hosted with godaddy and I am able to post a SQL Database. I know that our website as it stands is very poor. The people who have maintained it in the past have no idea what they were doing, my job is not the website, I am over Health & Safety Training, but have done some work with websites for fun in the past. I know a little about Visual Studio and plan to rebuild the site using C#. I can build a basic Database and interface to it with Visual Studio, Godaddy can help me with the payment part, but I have no idea how to set up SQL to allow scheduling. Any help would be appreciated. Even if it’s just a link to a tutorial.
Ed Hall
Director Health & Safety Services
Mountain Valley Chapter
American Red Cross
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