We are using 3 Pervasive v10.3 servers in our company. There are in 3 different locations and all is connected via VPN.
Is there any possibility to set in one server link to another? I want to query on one server databases located on another servers.
PS. Sorry for my English ....
You cannot link servers within Pervasive PSQL. Your client application can access multiple servers but you cannot write one query to access multiple servers at the same time.
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Lets say we have postgres and mongodb server and we sharded.
How does the database knows the specific database server to query a certain record.
or do we have to implement the logic in application layer
Does it differs for sql and no sql database
databases are divided into two parts.
server and client.
you can have few installed servers on the same machine and even a few on another machine, but every time you wanna use a client you will have to connect to a specific server.
if you connect your app to some DB - your app will act as a client, so you will have to connect from your app to some specific server by specifying a network address and port number.
Either your client/app server can decide which database server to direct the query to based on application-embedded logic, or you can have a coordinator node which your client connects to and which then routes the query as appropriate, based on look-up tables it keeps, and makes it all transparent to the client.
It is your hypothetical setup, we can't know what you did; you have to tell us. Did you use some commercial or open-source add-on to implement this?
We have approx. 8 odd SQL Servers used for different purposes like inserting data in 1 server, update in another etc. (or connecting to only that database based on user’s region).
The problem is sometimes query for data needs to be done from multiple SQL Server databases. So say, I have an Id property, and based on the Id data needs to be retrieved from multiple of these 8 servers (if there is an Id match, so basically querying all database).
So basically the server which the user is logged into, will use “Linked Server” functionality and connect to other SQL Servers (with the server which the user is currently on acts as the source SQL Server), and using “UNION” functionality to club all data.
As a lot of transactions is taking place each day, this approach is not feasible, performance wise.
So any recommendations on a better approach to achieve the same above functionality. I read a concept called “Server Groups” but not sure of it.
The application is made in .Net Web Forms using Jquery/Ajax/HTML/API and ADO.NET.
If you have a .net application which is outside these 8 servers can't you establish individual connections and pass the ID from .net app to these servers ?
As far as I know "Server Group" is a concept in SSMS which helps you to group the servers and can run common scripts at same time.
Can anybody elaborate the architecture of Oracle database which have multiple instance? I want to create a multiple instance in my local oracle database.
Currently I assume that 1 SID = 1 database. is that correct?
Do i need to have different listener for each SID? or I just need 1 listener for every SID in my machine?
Usually yes, 1 SID is 1 database with the exception of RAC (Real Application Cluster) where you can have multiple instances on different servers for the same database. In this case all the instances share the same database by accessing a SAN for exemple.
You don't need to have a separate listener for each instance on the same server, I listener is sufficient for multiple instance, it's a good practice to have the listener running on the higher version of oracle though.
You can have multiple instances on the same server using multiple oracle versions.
I have a machine where we have SSRS and SQL Server running, Currently we use SSRS and configured it to use localhost SQL Server hosted ReportServer and ReportServertempdb.
Now we need decomission this machine and move the reports to a brand new machine. Now the brand new machine does not have SQL Server, but we have another SQL Server which has 2 pre-existing databases: ReportServer and ReportServertempdb which are already being used by another SSRS instance. Now we are planning to use them for our to-be-moved SSRS instance as well.
Is it possible for multiple SSRS instance to use same ReportServer and ReportServertempdb? If yes how do you merge these? There are certain conflicting values. For example in the ReportServer DB in the table "ConfigurationInfo", SystemReportTimeout is 1800 for my current instance, but on my proposed instance value is -1. How to tackle this during a merge? I have many conflicting records in both ReportServer databases.
You can create several databases on your machine, each DB + TempDB for one instance. But it is not possible to share DB + TempDB for two different instances.
Even if this would work in theory, you will get a lot of problems with sync. caches tables, security tokens, etc.
Edit: So imho backup your databases and restore on a different name. Then you SSRS configration manager to connect to a existing database.
If you use security tokens for those DB's, make sure your have the .snk file.
Though you can share RS databases across multiple instances, you cannot merge two different ones to the same one. Unfortunately we cannot even rename RS databases as they are considered system databases. Your best bet would be to see if you can host your databases on another SQL instance on the same server or redeploy your reports on the new server.
For additional information you can refer to the following links:
Scaleout deployment: http://msdn.microsoft.com/en-us/library/ms157293(v=SQL.90).aspx
Managing RS DBs:http://msdn.microsoft.com/en-us/library/ms156421%28v=SQL.90%29.aspx
http://msdn.microsoft.com/en-us/library/ms159093.aspx
We have 4 products and each supports below 4 datasources.
Oracle
SQL server 2005
DB2
Datopia
Now We are building Administration product which will interact will all the products and hence their databases.We have some requirements where we have to access tables from different datasources in a single query.We initially thought of using Oracle transparent gateway to create DB links and then access tables in different datasources. But this requires oracle to be installed for one of the products. This restrictions cannot be brought in our environment(For example among 4 products 2 may have SQL server installation and other two may have DB2 installation). Which is the best way to connect to all datasources with out any restriction. One more thing, we are using java to connect to these databases. Thanks in advance.
You don't say what kind of framework your client software uses. But if it uses Java, dotnet, or PERL, you will be able to use that framework's data access modules to connect to the various table servers. You can connect to all of them from a single client process easily enough.
You db access won't be perfectly transparent. You'll need some aspects of your program to be Oracle- or SQL-Server- specific, for example. On the other hand, if you do this right, it won't be hard to add MySQL and PostgreSQL support if your customers need it.
You'll have a fairly steep QA burden -- you'll need to test with at least one and two instances of all four table servers connected simultaneously to make sure everything works.
But this kind of product usually has high value, so you should be able to justify the QA effort.