I'm supposed to migrate script and data for an Oracle data warehouse to SQL server. They want to transfer data last, so first I'm converting the existing PLSQL code into TSQL. Is there any way for me to test if the converted TSQL is returning the correct rows on the existing Oracle database?
You can set up a remote link to Oracle from SQL Server. This can be a bit more complicated than you would want. After all, the database hierarchy and naming conventions are different (for instance, SQL Server uses 3-part naming for tables in a database, Oracle uses 2-part naming for tables in a schema).
But, if you just want access to a single table, then this might be reasonable. The basic command to use is sp_addlinkedserver. But there are details. Here is a question with a detailed answer.
As for the porting project, I would suggest that you create sample data on both Oracle and SQL Server and use it to validate the port. Of course, you will have to eventually test on the real data. But being able to build the system using sample data that is safe from production users should facilitate your work.
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I am working on migrating an application from one server to the other. According to the connection string of this application, it is touching different databases. Meaning a view query in DB1 will touch a table in DB2. So while migrating this application, I constant get to see chain of 'Database unavailable' errors and every time I see such error, I have to migrate that specific database.
I am wondering, since we have ER diagrams to know about relationships between tables in a database, is there any way in SQL server to know the relationships/linkages between different DATABASES in a server? Are there any tool that does this?
Depending on number of databases you have, here would be a somehow quick way you can find that out (number of required search = number of available databases in the server):
Use 'SQL Search' application of Red-get
(https://www.red-gate.com/dynamic/products/sql-development/sql-search/download)
and search for the other database names one after another by selecting
your database of interest. Select all objects.
If you have metadata oriented design (a Stored Procedure looping through the names of different other Stored Procedures / Functions from different databases which are stored in a table as metadata and executing them with a wrapper Stored Procesure), then you will have make use of SQL Locator software (http://www.sqllocator.com/Downloads.html) to search for database names in SQL Table values.
Both of the above software are free.
You need to have SSMS (SQL Server Management Studio) installed to be able to use this application. After installation, ‘SQL Search’ will be directly available in your SSMS as an add-on.
SQL Locator can be directly used by providing the SQL Server name and your SQL Server credential.
Note:- The above steps will help you find out the referenced databases from a certain database within the same SQL Server. If you need to find out databases from Linked Server (I do not believe your question is asking that anyways), then you will have to smartly utilize the same above tools to find the external server reference by searching the external server name.
Is it possible to build a generic query that verifies and if needed corrects a whole table schema?
Example:
On my dev machine i have a sql server with some tables. I, and others, make changes to the tables and sometimes misses to notify the others about them. :/
I want to build a query that reads the dev sql tables and creates a query that i can run one another sql server and updates that table there so that they are equal.
I cant drop the table and recreate it unfortunately. I dont want to change any of the data.
If this is to hard with sql syntax is there some tools that can do this for me? The sql tables are almost always on different machines and most likely i cant connect directly to them from the same place. So tha fixing/verifying needs to be done "offline".
Time is not of the essence, it can be a very slow query as long as it works.
update: I want to verify the sql schema and not the content of the table
update2: We are using SQL Server 2008 R2
It is possible, but not easy. This kind of tool is called a Data Dictionary, and you can write one yourself (see advice from the Database Programmer) or you can buy a commercial one, for example RedGate's SQL Compare.
I have users entering data in SharePoint (Running on SQL Server), but my application to view that data will be an Oracle Apex app running on Oracle, obviously. How do I have the data be pushed into the Oracle db automatically?
First off, are you sure that you need to replicate the data to Oracle? Oracle Heterogeneous Services allows you to create a database link in Oracle that connects to a non-Oracle database using ODBC (assuming you use the Transparent Gateway for ODBC which is free). Your APEX application could then query and report on data that is in SQL Server by issuing queries that run over the database link. Tim Hall has a good article (though it's a bit dated and some of the components have been renamed, the general approach is still the same) on configuring Heterogeneous Services.
If you do need to replicate the data, you can create materialized views in Oracle that query the objects in SQL Server using the database link you created with Heterogeneous Services and schedule those materialized views to refresh on a regular basis. The materialized views will need to do a complete refresh, though, which means that every row will need to be copied from SQL Server to Oracle every time there is a refresh. That generally limits the frequency with which you can realistically have refreshes happen. If you need the data to be replicated to the Oracle database and you need to send incremental changes so that the Oracle side doesn't lag too far behind, you can use Streams from a non-Oracle database to an Oracle database but that involves a lot more work.
In SQL Server you can setup linked servers that allow you to view data from other db's. You might see if Oracle has something similar, if not the same. Alternatively, you could use the sql's integration services to push the data over to an oracle table. Unfortunately I only know how to setup linked servers in SQL Server and I don't have a lot of experience with ssis to tell you how to do that, but those are the first two options I can think of that you might explore further.
Here's a link I found that might be helpful as well: http://www.dba-oracle.com/t_connecting_sql_server_oracle.htm
There's no way to do it "automatically" that I know of that will work across DBMS. ETL tools like Sql Server Integration Services might help but there's going to be a loading delay (as it will have to poll for changes). You could build some update triggers on the SharePoint database tables but that's going to turn into a support nightmare.
I'm working on a legacy project, written for the most part in Delphi 5 before it was upgraded to Delphi 2007. A lot has changed after this upgrade, except the database that's underneath. It still uses MS-Access for data storage.
Now we want to support SQL Server as an alternate database. Still just for single-user situations, although multi-user support will be a feature for the future. And although there won't be many migration problems (see below) when it needs to use a different database, keeping two database structures synchronized is a bit of a problem.
If I would create an SQL script to generate the SQL Server database then I would need a second script to keep the Access database up-to-date too. They don't speak the same dialect. (At least, not for our purposes.) So I need a way to maintain the database structure in a simple way, making sure it can generate both a valid SQL Server database as an Access database. I could write my own tool where I store the database structure inside an XML file, which combined with some smart code and ADOX would generate both database types.
But isn't there already a good tool that can do this?
Note: the application also uses ADO and all queries are just simple select statements. Although it has 50+ tables, there's one root "Document" table and the user selects one of the "documents" in this table. It then collects all records from all tables that are related to this document record and stores them in an in-memory structure. When the user saves the data, it just writes the document record and all changed data back to the database again. Basically, this read/write mechanism of documents is the only database interaction in the whole application. So using a different database is not a big problem.
We will drop the MS-Access database in the future but for now we have 4000 customers using this application. We first need to make sure the whole thing works with SQL Server and we need to continue to maintain the current code. As a result, we will have to support both databases for at least a year.
Take a look at the DB Explorer, there is a trial download too.
OR
Use migration wizard from MS Access to SQL Server
After development in Access (schema changes), use the wizard again.
Use a tool to compare SQL Server schemata.
I have a SQL server database (Tables, Views, SP...). I need to convert this database to Oracle 10g. How can I do it?
Transferring the data will be easy; SQL Server integration services can do that, or Oracle's SQL Developer.
However, views and stored procedures are different between Oracle and SQL Server. SQL Server uses T-SQL, Oracle uses PL/SQL. These are not very compatible and I don't know a tool can automatically convert between the two. If your database relies on specific T-SQL features, you will need a developer to do the conversion.
Get the jTDS jdbc driver from sourceforge.
Add it to Oracle SQL Developer.
Tools > Migration > Migrate
Create a migration repository in your new Oracle database.
Create a new migration project.
Point it to your SQL Server database.
Convert it - mind the data types.
Migrate the data:
online row-by-row inserts over JDBC. Fine for SMALL/test boxes.
offline - use micrsosoft's unload utility to pull the sql server down to flat files. SQL Developer will create SQL*Loader scripts to put them over into Oracle.
If you have GoldenGate licensed, use that to move the data over and to synch changes from one system to the other in case you need to keep both up and going.
Start looking at the migrated T-SQL procs and functions. SQL Developer will leave comments for code blocks it wasn't able to translate...but you will need to TEST and VERIFY every single translation. Customers can see upwards to 80-90% translation rates for their T-SQL, but it could be as low as 50%...it just depends on the nature of your code.
The entire process is described here.
I wrote a white paper, with Sybase ASE as the example source platform, here. The process is identical for SQL Server. It has step-by-step guidance with screenshots.
If you have an Oracle account manager, reach out for help. We have specialists that deal exclusively with migrations such as yours. They have lots of practical advice and can recommend 3rd party partners if you lack the expertise.
sql developer can help. You can download it here , it is free. http://www.oracle.com/technology/software/products/sql/index.html
There is step by step documentation including videos on how to migrate SQL Server to Oracle DB. You find it here:
Migrating from Microsoft SQL Server to Oracle
Or you can use a tool to do the job for you like Ispirer - Migrate Microsoft SQL Server to Oracle
You basicaly setup an Oracle Server, once its ready you migrate your tables using a software made for that. I guess this script can do the job:
m2o