I want to learn about triggers, viewer in SQL ?
I also would like to learn some Advanced database management concepts ?
would someone give me a clue about a Text that i can learn it individually ?
Your questions are somewhat database specific. Meaning that triggers and database management will be somewhat different for MySQL, Oracle, and DB2.
The advantage of learning about MySQL is that you can practice on your own machine.
The advantage of learning about Oracle and DB2 is that people will pay you based on your knowledge and ability.
Database Management has evolved dramatically over the last decade or so. For example, the Oracle Autonomous Database aims to eliminate the need to perform mundane database “management” tasks, so DBAs can now focus on greater value activities such as fleet management and getting value out of data through analytics and machine learning, integration, and leveraging converged database features and capabilities for applications etc. This increases an Oracle DBA productivity and value to the organization, very substantially.
The Oracle Autonomous Database is self-driving, self-securing, and self-repairing. You can learn more about Oracle Autonomous Database at https://www.oracle.com/autonomous-database/
Oracle is also currently (in 2021) offering free training and certification for Oracle Autonomous Database.
BTW, to answer the other part of your question - you can learn about TRIGGERS from the Oracle documentation. Please refer to the Using Triggers section in the 2 Day Developer's Guide to start with - https://docs.oracle.com/en/database/oracle/oracle-database/21/tdddg/using-triggers.html#GUID-3744214A-861D-4C59-AD2D-95840B5B0871
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Does it matter which Database you decide to use in your VB.net program? If someone could give me a Pros and Cons of maybe performance/ simplicity/ potential that would be great. I know Access fairly well, but if SQL is better I would like to switch over.
Yes it matters. If you are talking about a real system you should use SQL Server without even considering access as an alternative.
MS access is a light database management system oriented to amateurs. It lacks many of the administration tools needed on a real system. Of course, it is a lot easier to setup and learn.
SQL Server is a relational database management system providing professional tools. SQL Server Management Studio is the default graphical tool on which you can administer your SQL Server instance.
Regarding performance SQL Server is definetely better. Regarding simplicity Access is a lot easier to learn. Regarding potential I suppose the SQL server certainly is better.
Perhaps this post could clarify things for you...
Hope I helped!
It depends upon your program bro.
let me start with MS ACCESS, MS Access is actually a combination of a rapid development UI tool and file system based relational database (JET). Access is intended for end users. it does not cater multiple users. however, it is easy to deploy and much cheaper especially for small installations.
on the other hand, MS SQL SERVER is a Client-server relational database system, with no UI development tools built in. It is also designed to support more users a lot easier to maintain because of its tools provided. Compared to MS ACCESS, it is more complex and has No built-in UI development tools - You will need another dev platform to build a front-end and (arguably) reporting. In my case, i usually implement Crystal reports as my reporting tool....
In conclusion. It is really your choice on what database you are going to use....if its just a simple application, better use MS ACCESS... but if you are creating an application that caters client server interaction, better use MS SQL SERVER...
We are looking for a development tool for oracle DB.
Most of our work on the DB will be done with PL/SQL procedures, so we need to debug them.
We will also need some minor Administration capabilities, like monitoring the session.
We got a recommendation to use Toad.
There are several versions.
Which version of toad suites us the most?
Are there any other noteworthy tools?
What do you recommend?
Thanks.
I have used and particularly likes the following two:
PL/SQL developer - paid
software, simple UI, great for
creating/editing/debugging PL/SQL as
well as admin activities.
Oracle SQL
developer - free, Java based,
right from Oracle. Great for PL/SQL
creation/debug.
Good luck!
I would like to know if there is any tool able to extract the design from an existing Oracle database.
I have a read access to it and I would like to have the design. Or simply export it to a *.sql and then read it with any tool able to create the design with the links between the tables.
Something like that
(source: fileguru.com)
Thank you very much.
There are a number of tools which do reverse engineering from an Oracle database, but most require a license.
Oracle has its own Data Modeller. Previously Oracle tried to charge an exorbitant licence fee but obviously they had few takers because it is now free. It is not a great product but it does a decent job on reverse engineering.
If you are a site which uses TOAD then you should definitely consider Quest's TOAD Data Modeler. The additional cost is not a great stretch from the basic TOAD fee.
There are not many other free tools left on the market but SQL Power offer a community edition of their SQL Architect tool which does reverse engineering. Check it out.
Oracle SQL Data Modeler answered to all my questions.
It has a reverse engineering tool that creates the logical and physical model from the database.
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Has anyone used all three of these databases? What are your experiences with them? PostgreSQL looks pretty tempting for a project but I'm curious to learn more about it (We're a .NET Shop). I've also heard of quite a lot of people being satisfied with DB2.
I work in a very large organization that uses DB2 primarily on Linux (Red Hat). We have a number of large databases and have investigated moving to other RDBMS solutions, such as Oracle and SQL Server. I did a lot of work on the SQL server end of that.
We found that SQL server performs much better and requires less tuning than DB2, especially when tables frow larger than 1M records. HADR is also difficult and bulky, to say the least.
We found many differences between DB2 and SQL Server, and too many to list here. I was responsible for doing a lot of the engineering behind code conversion from one platform to another, and can't say I found anything in DB2 to be superior to SQL server, but did find many things I liked better about SQL server. Here are some off the top of my head:
Better selection data types in SQL Server, such as MONEY and SMALL MONEY.
Mixed character encoding in SQL Server. Some columns can be ANSI and others UNICODE (char and nchar, respectively). Setting this up in DB2 is neither straightforward nor easy.
Better tools in SQL server, mainly SSIS for ETL (As opposed to the insanely priced IBM Data Stage).
SQL server has more forgiving syntax. For example, you don't need semi-colons everywhere. Maybe just a personal preference but I found it much easier to code in T-SQL.
Many advanced features seem to work better in SQL server. For example, SQL server lets you do page-level compression, where DB2 is limited to row-level compression.
It was easier to tune SQL Server queries with the SQL Server IDE
There are more, but honestly I suggest that anyone who is considering one over the other should set both up and spend some time working with both systems. Right now it seems like SQL server is a better overall solution, but DB2 may one day take the crown.
Lastly, when dealing with data warehousing, SQL, SSIS, and SSAS made a much better solution than InfoSphere, DataStage, and DB2. I could write a whitepaper on it, but my suggestion here is to set it up on your own and spend a week or to playing with each solution. Microsoft's solution here was faster and cheaper than IBM's. I don't know of any other basis upon which to make a decision.
Platform shouldn't be an issue since databases generally run on their own machines, but there are always those "no microsoft!" and "no linux!" shops around. It's a shame, really. I'd recommend SQL server.
As a DB2 person, I can offer a few details about what you could expect from running DB2 for Windows and developing .NET applications for it. The following details were current as of version 9.7, which was released in June 2009.
Drivers and API support for just about any Windows programming language and IDE, including .NET and Visual Studio extensions
A no-cost, production-ready database engine (Express-C) that has no database size limit and is the least restricted when compared to Oracle Express and SQL Server Express
A self-tuning database engine for Windows that automatically handles the sizing of several memory buffers that are critical to good performance
Rock-solid support for XML as a native datatype, handled by its own dedicated query engine that is optimized for XML's hierarchical nature. Queries can access any combination of XML and tabular data with any combination of SQL and XQuery expressions
Avoid microsoft like the plague. Always push to use PostgreSql even on windows, way better support for developing applications for e.g. Java/Python and still has good support in .NET. Also of course is completely free which given the current license fees for SQL Server is nothing to be sniffed at even if you're a multi-million dollar company.
For the cost of 1 SQL Server license you are going to save £30,000 (say $40,000) or more - buy better hardware to run Postgres on and still have a net benefit.
As far as performance, really if this is such a massive issue we should not be using either DB2, SQL Server or Postgres anyway. The difference between the three is negligible for their design purposes.
Edit: On the .NET integration, actually this is really poor in SQL Server anyway, it does have more features than Postgres/DB2 admittedly but it's not really hugely advantageous over SSIS or stored procedures. I could see the main use case in my work as accessing classes and functions from a CLR .dll but then you're implementing logic in the database which may or may not be a good idea for you.
If you're a .NET shop, and are either using a small database (i.e. Sql Server Express), or have the money for the full SQL Server, use it. SQL Server will perform better than PostgreSQL for most actions, and about the same as DB2.
PostgreSQL is fantastic if you need multi-platform support, are Linux-based, or need a free product that's not Microsoft.
I haven't used DB2 in over 10 years, other than running an in-house performance test vs. other databases (where it was about the same for a transactional database as Oracle/SQL Server, where were better than MySQL, PostgreSQL, etc).
If you are a .net shop stay with SQL Server.
Using any other database platform would require non-Windows to get the best out of it. On Windows, SQL Server is king simply because MS own both OS and SQL Server (Like Oracle/Red Hat).
In Visio 2003 Architect version I can generate a SQL Server Database on the fly from UML ER diagram. But there is no such a way by using Visio 2007. My question is: Any other good and latest tools can support ER-> DB or DB->ER very well for SQL2005/2008?
I think Enterprise Architect can do that too.
http://www.sparxsystems.com.au/
You can do the ER diagram on Visual Studio creating a dbml file and then export to a Sql Server script using the huagati plugin. http://www.huagati.com/dbmltools/
If you're looking for a free/open source tool to achieve this, you could try:
DBDesigner
From the website:
DBDesigner 4 is a visual database design system that integrates database design, modeling, creation and maintenance into a single, seamless environment.
It combines professional features and a clear and simple user interface to offer the most efficient way to handle your databases.
DBDesigner 4 compares to products like Oracle's Designer©, IBM's Rational Rose©, Computer Associates's ERwin© and theKompany's DataArchitect© but is an Open Source Project available for Microsoft Windows© 2k/XP and Linux KDE/Gnome. It is release on the GPL.
And it supports the following features:
Available on Linux / MS Windows
User Interfaced based on industry standard layouting software
Design Mode / Query Mode
Reverse engineering MySQL, Oracle, MSSQL and any ODBC databases
Userdefined schema-generation
Model-To-Database syncronisation
Index support
Automatic foreign key placement
Weak entity support
Standard Inserts storing and sync
Full documentation capabilities
Advanced model printing
Output as image
All MySQL datatypes with all options
User defined datatypes
Database storage, ability to save model within database
Network-/Multiuser access through database storage
Version control*
SQL Query Builder
SQL Command History
SQL Command storage within model
Plugin interface
I think the bolded ones above (my own emphasis) should give you what you require (i.e. effectively two-way database/model synchronization).
I have used the tool in the past to reverse engineer an existing database to an ER diagram. From what I remember, it wasn't the most stable software I'd ever used (I seem to recall it crashed a couple of times) however, this was a little while ago so it may be more stable now.
I remember that in Visio 2003 that was only possible, I believe in the Enterprise Edition. Could that be your issue with 2007?
Most of the tools don't handle SQL 2005/2008 correctly. But CA ERwin® Process Modeler does the best job (at a cost though).
There is a community edition but it is limited to 25 objects per model.
Give it a try and let us know.