I'd like to know your opinions here, what tools do I have to learn first before studying OBIEE for ex. "Oracle Database" do I have to need a prior knowledge in Oracle Database in order for me to learn OBIEE in fast pace. I need your suggestions here.
Thanks
It actually depends on what you want to do with OBIEE. You can be a reports developer, the metadata developer or an OBIEE Administrator. If you end up becoming a reports developer, you'll require less database knowledge. But to start off, you will require knowledge of
Any one database (Oracle, mySQL etc)
Dimensional modelling concepts
I've always believed in installing the software and filling the knowledge gaps while you're working on it.
Related
Please specify whether it is possible to track the SQL in Oracle launched queries?
If yes, you can, how to do it?
The essence of this, there are several employees, and you need to understand who and that runs, that is, some kind of username of users, where the start-up requests will be visible, who launched when I started, and how much time went to the execution of the query.
If I do not understand my question quite enough, ask. Thank you all for your attention!
If you are talking about real time performance monitoring of your database, then this will depend on a number of factors, including exactly which version of Oracle you have. Oracle is generally tooled to provide the kind of metrics you're talking about, but the most useful ones (in my experience) may require additional software and additional option licenses to make them visible.
SQL Developer has some basic functionality within its DBA connection options. It can also make ASH and ADDM reports more accessible. Other tools like Oracle Enterprise Manager and Foglight for Oracle provide more detailed metrics over time.
More recent versions of Oracle have more options built-in. Your best bet is to start with Oracle's "2 Day DBA + Performance Tuning Guide" for your version of the database:
Oracle 19c
Oracle 18c
Oracle 12cR2
Oracle 12cR1
Closed. This question is opinion-based. It is not currently accepting answers.
Want to improve this question? Update the question so it can be answered with facts and citations by editing this post.
Closed 8 years ago.
Improve this question
I see this claim made in a rant here http://discuss.joelonsoftware.com/default.asp?joel.3.456646.47 . As well as in various other rants that can be looked up on google using "oracle sucks". Ok, well, if let's say something as low key as Drupal doesn't have an easy to use visual IDE I can understand why, but if this is really true about something as big money as Oracle, why don't we see an entire ecosystem of user-friendly visual tools for basic DBA work on Oracle? I mean, people who work on Oracle work for companies with big budgets, so surely they could afford a license for a fancy "sit tight and enjoy the ride Oracle admin studio" of some sort to help developers do some stuff by themselves without pestering the DBA? Or do these tools really exist and do good job whereas the people doing the rants are simply unaware of them?
Quest Software has a variety of tools, primarily TOAD but also Spotlight and there is a backup monitoring tool in beta, for database admin.
Part of the issue is that Oracle runs on a variety of platforms, such as Solaris, Linux and Windows. The larger (and therefore more complex) installs have been on more exotic hardware. A 'full stack' admin tool would really have to be native to the database platform, and that just hasn't been practical. That's one reason why the OEM stuff is built as a web-app, and why SQL*Plus, the standard client, has stuck as a command line tool. As has RMAN, the backup/recovery manager.
Another issue is that there is a lot of baggage in Oracle. Rather than a simple "Database = File" or "Table = File" model, Oracle needed to cope with data volumes too big for single files. So they have a concept of a tablespace which maps database objects to data files. That's not so much an issue with modern filesystems.
Finally, Oracle is a high-end product. You use it in situations where the cheaper alternatives can't cut it. So it is often applied in more complex environments which would require more admin anyway. In that way, it is more a case that with Oracle, you can admin your way out of situations which impossible for a competitor product.
There are tools for Oracle, both built-in and third-party.
I think that the tools for SQL Server are a lot easier to use. And third party tools for SQL Server (i.e. Red Gate) are also extremely easy to use and powerful (compared to Toad, which has a byzantine and complex user interface)
Oracle is a multi-platform database and it dates from the original RDBMS implementations generation (one of the first which competed to replace older systems), so it has a lot of layers at install which can be very challenging to deal with. PL/SQL is also more difficult for development compared to SQL Server, MySQL or DB/2 in many ways.
From the point of view of small development shops without dedicated development DBA (or a production DBA who actually understands development) resources, Oracle is less productive than SQL Server or MySQL.
For DBA management and monitoring there's Oracle Enterprise Manager Grid Control. Not an IDE, purely an enterprise-wide administration tool for all of the databases in an organization. Everything from backups to performance monitoring, job creation, alerts, and so forth.
When I was a grasshopper Master Po told me : 'A fool with a tool is still a fool'. As others have pointed out Oracle is a high-end product. You really have to read the documentation, once you understand the basic concepts of oracle there are a lot of tools available. Allmost all tasks are command-line based. A lot of different GUI applications are available to assist you. Oracle's main tools are Enterprise Manager and SQL Developer. Server side you have a few tools you can use: Database Configuration Assitant, Network Configuration Assistent, Migration Assistent, etc. Choose the one you like for a sprecific task. Bottom line is : it's not a point and click application.
If you're deploying Oracle in a large corporate environment, there is an ecosystem of user-friendly tools to administer the database. But most of those tools are relatively painful to install-- they need their own database, for example, and install components on the database server along with the central repository. It makes perfect sense to invest in this sort of heavy-weight infrastructure when you're spending 6 or 7 figures on Oracle database licenses and you need to handle things like continuous monitoring and alerting.
On the other hand, most of the folks that are complaining about Oracle usability are trying to install and run Oracle in a much different environment. If you're a developer, for example, that wants to run Oracle on your local laptop so that you have the full stack installed, you're not going to need or want one of these heavyweight tools. Those folks are going to end up with whatever tools Oracle installs by default. Traditionally, those tools have been somewhat less than ideal. Oracle is getting better about that by shipping a lightweight Enterprise Manager web client with the database that is very useful for these types of installs. But it can still be a bit of a fight to ensure that the Enterprise Manager web client works perfectly on a developer's Windows laptop install which leads a non-trivial number of developers to conclude that "Oracle sucks".
I use an app called PL/SQL developer, and it works pretty well, IMO.
www.enterprise-elements.com is one such tool
You have noticed that you are pointing to a four-year-old rant right? By a supposed DBA who didn't even know enough to turn off unneeded services in order to shorten up the load time?
I'm sorry, but if the complaint is "why can't this industrial-strength DB be managed as easy as this lightweight, feature-poor, freeware?" then I think it is a self-answering question.
To answer the rest, yes there are tools out there. To specifically answer your " I mean, people who work on Oracle work for companies with big budgets, so surely they could afford a license for a fancy "sit tight and enjoy the ride Oracle admin studio" of some sort to help developers do some stuff by themselves without pestering the DBA? " , this is more often a factor of a DBA choosing to lock down privileges - not a function of the database itself. A tool is no use to a developer if their user account is not granted the rights to do what they want.
Rants like that one? Looks like someone tasked with running an app they had no interest in actually learning much about. No wonder they got frustrated. Yes, sometimes Oracle causes frustration of its own, but many of these rants are from people who probably picked a database platform far above their needs, and are disinclined to really learn how to manage it.
I have joined a project which has been already developed and its a legacy project with very large database and its in Java/J2EE.
I am trying to understand the Database Design & Architecture and so is there a tool available which can generate schema from the populated table representing all the constraints like foreign keys etc ?
Basically am looking for an Database Re-engineering Tool. My database is Oracle 10g.
Inputs would be highly appreciated.
I use ER/Studio and I absolutely love it for all my data modeling, reverse engineering and database design work.
http://www.embarcadero.com/products/er-studio
I should really become an ER/Studio evangelist.. but really, it is a great product.
Haven't played much with it, but Oracle has a tool included with SQL Developer: Oracle SQL Developer Data Modeler. I agree with #Raj that ER Studio is very good; I've also used ERWin. Both have the drawback of being quite pricey. For a while there was free downloads, but I see now it appears they're charging for it. Don't know how much.
I need to diagram an oracle database and I am hoping to find some good tools that are either cheap, or free.
Ideally the tool should allow me to draw the relationships between the tables, as well as remove unwanted tables from the diagram.
I already have access to MS Visual Studio 2008 as well as SSMS 2008, but I don't believe either will provide much help with oracle.
I asked this question here on serverfault, and I had several answers. However after I tried most of the tools I ran into problems with all of them.
I prefer SQL server over oracle, but I have one legacy oracle system to manage, and I am finding myself climbing an uphill battle against the numerous errors oracle throws at you on a minute by minute basis.
Have a look at TOADSoft and especially Toad Data Modeler (Toad is a very famous tool).
Another well known commercial tool is PL/SQL Developer. This is a more integrated solution (not only graphical modeling).
In both case, I didn't check the pricing but I'm sure they are worth it (and the prices must be insignificant in comparison to Oracle's license).
Like your friends over on serverfault, I had a really good experience with PowerArchitect. And it's free. . . .
Maybe I don't understand, but its only a diagram. In which any UML tool will do the job, even Visio, which should have for free or next to nothing for you, not to mention the tools in that blog. And there always pencil and paper.
Visio professional will let you reverse engineer the database schema and I've done this with Oracle before. It's actually quite good for this as you can organise the diagram into subject areas (i.e. separate pages). You can also annotate the diagrams with missing foreign keys; this is quite a useful feature for making sense of vendors' databases.
'Enterprise Architect' versions will also allow you do generate DDL from the diagrams, and you can often get VSEA2002 or VSEA2003 quite cheaply; these versions come with the EA version of Visio bundled.
I think Visio has a feature called "Reverse Engineering", with which you can specify a database connection and it will automagically draw the Diagram for you. The database connection can be anything accessible via ODBC.
(MySQL also offers such a feature in its MySQL Workbench, though I don't remember, if it was possible to specify a different database system than MySQL itself)
As long as we're mentioning pencil and paper, I'll throw in the next step up from pencil and paper. It's MS Access.
If you have MS Access on your PC, and if you can set up table links from MS access to Oracle, you can use MS Access to generate relationship diagrams, which you can then print.
You have to do a fair amount of manual work, compared to some of the pricier tools.
Set up an empty MS Access database. Then set up a table link to each of the tables in your Oracle database. Then use the Access relationship tool to draw relationship lines between each foreign key and the key it references. Classify each relationship as many to one. This creates the lines between the boxes. You can use the Access interface to drag the boxes around on the diagram until you like the visual layout. You can print the resulting diagram.
Oh, and by the way, you can create local tables to act as snapshots of some of the data, and MS queries to reload the local tables from the Oracle data. That way you can mess around with the local copies without writing to the Oracle database. You can even set up table links to a SQL server database, and move data across, bit by bit.
Depending on the complexity of your Oracle DB, and your diagramming needs, this could be enough of a tool for you.
Oracle's own SQL Developer Data Modeler has a "Free to download, free to learn, unlimited evaluation", whatever that means.
I started learning .net about 3 years ago. I have gone thru a boot camp during that time learning OO and various data access technologies such as NHibernate, Subsonic, LINQ TO SQL.
didn't wanna try EF cause it hasn't reached version 3 :)
As far as reporting goes, I have heard that many ORM'S fall flat on their face when it comes to reporting. We have AS400 OR DB2 as our backend. I have heard that LLBLGEN does a good job on reporting for this product. But it is a commercial product and not FREE. Can someone point me to some good resources for Reporting from DB2? thanks for any links/blog articles
Reporting on DB2 will work the same as reporting on almost any other database - you can use ODBC, JDBC or native DB2 calls to the database. So, you don't need DB2 reporting references - any database reporting references should meet your needs.
The only thing special about DB2 might be a little of the syntax extensions, and how you scale up the back end through parallel database servers (like MapReduce, Teradata, etc). But neither should be of much concern - since it's extremely ansi compliant and the scalability should be largely invisible to the reporting developer.
And Crystal Reports, Brio, Cognos, Business Objects, Microstrategy, Actuate, JasperReports, Birt, etc should all work fine.
ORMs are typically terrible for reporting - since they're object rather than set oriented. You'll especially feel the pain with very large data volumes, complex reports or a large number of reports.
Please, don't overlook the most obvious answer: Query/400!
It is native iSeries software. You configure and runs the report on the iSeries but it works great. It is simple, straight forward and maybe a little bit limited but you get most of the works done.
Don't be scared of the green screen or the simple interface. It's really a powerfull tool that does handle the iSeries database very well.
Can someone point me to some good resources for Reporting from DB2?
RPG I!
Light up those indicators!
Query Manager:
You cam use SQL (that can take input parameters) to build it, then create a "form" that will provide totals, level breaks, counts, customized headers, titles, etc.
Query/400 does not accept parameters AFAIK.
Free manual at:
http://publib.boulder.ibm.com/infocenter/iseries/v6r1m0/topic/rzatc/sc415212.pdf