Oracle and SQL server have a database change notification feature that notifies table/row level changes in a database to registered clients. The feature is mostly used for synchronization of data with other data sources.
I've been looking for this feature in DB2 but so far, no luck. Does DB2 not provide this feature at all or am I missing something?
There is no such feature out of the box, not in the LUW version anyway (since you reference Oracle and MS SQL Server, I guess that's what you're interested in). You can easily roll your own using Q Replication event publishing, InfoSphere Change Data Capture, or plain old triggers and MQ functions.
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Is there any instructions on migrating databases, say Oracle to Db2.
Is it just creating the tables in DB2 then exporting table info from oracle and inserting them to DB2
MobileFirst 7.1
I agree with Vivin, but be aware that the changes required to the server configuration must be carefully reviewed and tested in order for the system to operate properly. You'll also need to change the JDBC driver.
Database administrators should be able to do this either manually or using tools/utilities.
Some of the tools/links that show up in a search on the topic are:
a) IBM® Database Conversion Workbench
b) Database Migration from Oracle to DB2 - IBM
c) Oracle to DB2 Conversion Guide: Compatibility Made Easy
d) Move data using the IBM DB2 Migration Toolkit
Is there a way to check if an SQL Server table (or even better, a page in that table) was modified since a certain moment? E.g. SQL differential backup uses dirty flags to know which parts of data were changed since last backup, and resets these flags after a successful backup.
Is there any way to get this functionality from MS SQL Server? I.e. if I want to cache certain aggregate values on a database table which sometimes changes, how would I know when to invalidate the cache? Or is the only way to do it to implement it programmatically and keep tract of this while writing to the database?
I am using C# .NET 4.5 to access SQL Server 2008 R2 through NHibernate.
I suggest you think about your problem in terms of application layer data caching instead of SQL Server low-level data pages. You can use SqlDependency or QueryNotification in your C# code to get notified of changes to the underlying data. Note that this requires ServericeBroker be enabled in the SQL Server database and there are some restrictions the on queries that qualify for notification.
See http://www.codeproject.com/Articles/529016/NHibernate-Second-Level-Caching-Implementation for an example of using this it with NHibernate.
From within Oracle RDBMS I would like to connect and query/manipulate data in a remote JDBC compliant database.
Ideally I would like to use the remote JDBC database through an Oracle database link. I was hoping that I would be able to do it just like for any other database link:
UPDATE table1#remoteJDBClink
SET col1 = 'Joe';
It seems to me that Oracle database links are limited to where Oracle has created a Gateway product for the target db. They do support "Generic ODBC" as a target, but strangely I cannot figure out how I would do "Generic JDBC" as the target db.
Any other suggestions as to how I would query/manipulate a remote JDBC database from within Oracle are more than welcome. Perhaps the whole Gateway stuff in Oracle has been superseded by something else that I should use? At least I feel the information about the topic on Oracle's website seem a bit dated.
My requirements are very simple: Just basic SELECT, UPDATE, DELETE, INSERT. No cross-database joins, no distributed transactions, etc. I wonder if Oracle allows one to build my own Gateway?
Oracle version: 11g (or better)
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 have two databases: the source is a database from SQL Server Express by client and the target is a database from SQL Server 2005 database as backup initially. What I need is to sync the source to the target db if there is any difference between them and the sync is one-way from source to target.
I am not sure what tools are available. I tried to google this issue and found MS VS Team Edition (2005) has a tool to sync database, which can generate T-SQL scripts as well. Not sure if this one is good or not. Can I use the script as a scheduled job on SQL Server (target server)? By the way, I don't have Team Edition right now but I do have VS 2005 Prof. Any suggestions?
IMHO by far the easiest and fastest way to sync the two databases one-way (A to B) is to backup database on A and restore it on B. This could be done via T-SQL, let me know if you would like me to post SQL statements
Ideally you would set up Transactional Replication from your source to your target(s). However, since your source is Express edition and Replication does not work with Express as a publisher (source) but only as a subscriber (target), you cannot use it.
The best solution would be to upgrade your Express edition to SKU that supports Replication publishing (ie. Standard Edition).
Log shipping, or manual backup/restore, will not work because it will create an absolutely identical copy of the source db at the target, overwritting any changes made by the target (you mention 'some differences' may exist). Same goes for File/Copy.
SQL Compare tools are OK for a one time manual operation, but they fail at automated operations because they always compare the two databases from scratch, ei. are not capable of synching just what changed. As soon as data grows to a sufficient size, the comparison approach is doomed as it has to ship over the entire database for purpose of comparison alone.
Other solutions are to set up pro-active real-time ETL, but the time/cost investment into this is prohibitive compared with the cost of a SE license and deploying Replication.
Pay to play:
http://www.red-gate.com/products/SQL_Compare/index.htm
Free, open source:
http://www.codeplex.com/OpenDBiff
You should into the SQL Server tools produced by Red-Gate. I've found them to be the best around.
If you have SQL Server 05, you can use replication services(this comes with SQL Server). If you open up your management studio, under your server folders you should see one titled "Replication". From here you can setup subscriptions or publications with push or pull syncs.
Here's MSDN's take: http://msdn.microsoft.com/en-us/library/ms151198.aspx
If this is a one time / once-in-a-while thing, you can use SnapShot Replication.
If you need the databases to be in sync all the time, you can use Transactional Replication.
http://msdn.microsoft.com/en-us/library/ms151847.aspx
In addition to Red Gate tools you can try DB Ghost as well http://www.innovartis.co.uk/. It's most useful as a automated build tool, but does also have an user interface to diff and sync databases. It costs ~$350.00
USing microsoft sync framerok
http://msdn.microsoft.com/en-us/library/ee819079.aspx
http://msdn.microsoft.com/en-us/library/ff928525.aspx