I use Mac and PostgreSQL is the choice for db management. I can not install MSSQL. There's a db which is created and managed by MSSQL.
I must not copy the entire data via a script, to my database (because of using real time data)
My only option is, connecting that MSSQL created db with PostgreSQL.
Is it possible? If yes, how? Will there be any relevant limitations for my queries?
Thanks.
Additional details:
I'll make selections, calculations, statistically.
I won't modify the existing data.
The feature, which allows you to connect to a different database from within PostgreSQL itself, is called foreign data wrapper.
Here, there is a list of available foreign data wrappers, but mssql is not included. But ODBC is, so (in theory) if you install odbc_fdw, you can access foreign mssql tables in your PostgreSQL instance.
There is also a tds_fdw for SQL Server which uses FreeTDS for the connection rather than ODBC
Related
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.
In SQL+, I first connect to the server I have been given;
CONNECT/
Connected.
However, when trying to create a Database I get the following:
CREATE DATABASE Project3;
CREATE DATABASE failed
database already mounted
I've also tried - STARTUP NOMOUNT but only states I have insufficient privileges.
Is there something i'm doing wrong here?
In case this is Oracle you are talking about (Oracles default CLI is called SQL*Plus), this means that a database has already been configured on the server. Oracle only uses a single database per server instance. Inside those databases are schema's, and that is where your database objects will be stored.
See the below quote from: http://docs.oracle.com/cd/B28359_01/server.111/b28301/install.htm#ADMQS002
After you create a database, either during installation or as a standalone
operation, you do not need to create another. Each Oracle instance works
with a single database only. Rather than requiring that you to create
multiple databases to accommodate different applications, Oracle Database
uses a single database, and accommodates multiple applications by enabling
you to separate data into different schemas within the single database.
I have this SQL Server 2005 DB and we are upgrading to a new DB in SQL Server 2008. The schemas would be slightly different between the databases. What would be a best option to copy data from the old DB to the new DB.
Define "slightly different". Integration Service is probably the way to go.
Since the schemas are only slightly different, I would suggest making a full backup of the SQL2005 DB and restoring it on the SQL2008 server. Once you have the direct copy, use a script to migrate the data on the few tables where the schema is different.
It really depends on the definition of slightly.
Use Integration Service to design a whole package, or you can connect to the 2005 instance from within 2008 SSMS and right click on the tables and select "Import Data". This will bring up an Wizard that will do the work for you (through SSIS) and let you copy the data right over.
Another option is to use SQL Server Data Tools, which is a new tool from MS that has a schema compare tool where you can actually generate the scripts to create the tables and related objects.
http://msdn.microsoft.com/en-us/data/gg427686
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.