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I am new here, and i hope that i could find answers for my questions related to open source reporting systems.
Is it possible to change in the programming logic of 'Tableau desktop'? I am asking this because i need to make changes that
enables me to log users' interactions with the system (Tableau
Desktop).
Is it possible to perform Big Data analysis by combining Tableau Desktop with Hadoop or Spark?
If the answers for the above questions is no, then could you please
recommend any other open source (free) reporting system that satisfy
these requirements.
Thank you in advance and best regards to all of you
Tableau has drivers to connect to several "big data" No SQL databases, and has added a Spark SQL driver as of Tableau version 8.3.
The full list of supported drivers can be found on Tableau's website at http://www.tableau.com/support/drivers
Your question about logging user interactions is not at all clear, but you might have better luck instituting logging at the database level instead of at client level.
In response to your question regarding user interactions, I'd recommend you take a look at the views_stats table in the Tableau Server database.
Instructions for connecting to the 'workgroup' database: http://onlinehelp.tableau.com/current/server/en-us/adminview_postgres_connect.htm
Versions 8 and 9 includes a Spark connection
As far as logging users goes, Tableau Desktop is designed as a single license tool for developers and shouldn't need to be logged.
If you're interested in logging users, you may be thinking of Tableau Server, which has built-in functions for things like that as well as a REST API, which has some additional functions.
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I would like to test a flow between an hadoop datalake and teradata tables. The thing is that I am new to these technologies.
The data lake is my data source for the datawarehouse I have on teradata.
I read about QuerySurge but I'd like to know if it is possible to create my own scripts to test the flows.
Teradata offers connectors for Cloudera (link) and Hortonworks (link) which facilitate moving data between the platforms.
QueryGrid is an offering from Teradata that allows you to create "linked servers" on your Teradata platform. Using these "linked servers" you are able to query data on a Hadoop platform from Teradata. Currently, these types of workloads are intended to be low concurrency. That landscape is evolving fairly quickly and concurrency rates may increase as the technologies evolve and mature.
Feel free to use QuerySurge.
I'm working on Querysurge from last 5 years to test and validate the data from different sources.
it's basically automation of custom SQL Scripts.
QuerySurge
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I am looking for a open source tool that can be used to generate ER diagram. Currently, this is done using SchemaSpy. Maven scripts are invoked during jenkins build to generate these data model diagrams. I have tried POCs using SchemaCrawler as well. However, the results are not much satisfactory. Would appreciate if I can get pointers to alternative tools that can be used along with the same setup (maven and jenkins).
If you would like to find out good alternatives to SchemaSpy try to use and test this tools:
SchemaCrawler
Red-Gate SQL Doc (not FOSS)
Dataedo (not FOSS)
SchemaSpy 6.0
Each of them has different advantages and disadvantages SchemaCawler is also open source java based and free. SchemaSpy 6.0 this is new version of SchemaSpy that has better look and feel plus fix some major issue.
Dataedo is very interesting tool that has also possibility to generate documentation to pdf, html. With Dataedo you can write comments of tables and columns and after apply them on your database. As I remember on supplier page you can find also free version.
The last solution that I want to recommend is Red-Gate SQL Doc. This is also generate nice looking documentation and has many options. But as usually this solution is not free you need pay to use it.
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We deal with scientific research data and we have volumes and volumes of data put together in different template file formats (excel, csv, txt, xml etc). We were using old legacy C programs (developed in-house) to load these data into our databases. (We use ingres as our DBMS). Are there any open-source software that is available for ETL (extraction, transformation , loading) process?. What have been your experiences, if you have used any?
Based on what other Ingress users are saying, the 2 that are fairly well spoken of are Talend and Pentaho.
Pentaho site: http://www.pentaho.com/
Talend site - as already mentioned by Paul: http://talend.com/index.php
Here is an open source solution for importing multiple file formats into a database system or other system type.
http://talend.com/index.php
At the company I work at we use SQL Server Integration Services which does similar things but it should come with SQL Server if you're using that.
There is an opensource set of bi and etl tools - have a look at Pentaho - I believe it's etl tool is called "kettle" - pretty rich set of functionality, gui tools for the etl process.
We use DBMS/COPY but it looks like it is no longer in production. It has a GUI interface for setting up scripts or you can hand-write them.
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I work on an application that uses DCOM to communicate between what are essentially several peers; in the course of normal use, instances on separate machines serve a variety of objects to one another. Historically, for this to work we have used some magic incantations, chief among which is that on every machine the user must log into an account of the same name (note that these are local accounts; there is no domain available). Obviously, this is an aspect of our user experience that could be improved.
I would like to better understand how DCOM authentication works, but I am having difficulty assembling the whole story from the MSDN documentation for CoInitializeSecurity(), CoSetProxyBlanket(), and the like. Are there any thorough explanations available of how, exactly, DCOM operations are accepted or denied? Books, journals, web, any format is fine.
Programming Windows Security by Keith Brown includes a thorough discussion of DCOM security. I can highly recommend this book.
You could also try to round up a copy of Inside Distributed COM by Guy and Henry Eddon (Microsoft Press) - It is out of print but amazon shows a number of used copies for sale:
http://www.amazon.com/Inside-Distributed-Com-Mps-Eddon/dp/157231849X/ref=sr_1_5?ie=UTF8&s=books&qid=1231968553&sr=8-5
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Can anyone recommend some good resources that highlight the differences between Oracle and the AS/400 database?
I am trying to help someone with a lot of AS/400 experience implement an Oracle installation, and they need some guidance.
A book or online resource would be ideal.
I've done this a fair few times and the solutions out there really depend on the environment (enterprise / mission critical or development). The BEST way would be the Oracle AS/400 Gateway. Here are some important links in that area:
Allow AS/400 apps to access oracle with the Oracle Access Manager:
Installation Guide for the AS/400 Oracle Access Manager
Allow your Oracle apps to access AS/400 tables and be queried using Oracle:
Oracle Transparent Gateway for DB/2
^^^Those products are fairly expensive but super powerful.^^^
Alternately, here are some more academic approaches to the situation:
Here's a technical comparison of the two technologies... It's a little propagandaish*.
Technical comparisons of Oracle and DB/2
Here's a document written from the opposite point of view - Someone moving from Oracle to DB2. I still find it's useful information:
Leverage your Oracle 10g skills to learn DB2...
And another IBM link that has some really great information all around:
IBM Developer Network Search Results
Hope this helps!
*Yes, I know propagandaish is not a real word.
These links are not AS/400 specific, but generally a good place starting with Oracle:
http://tahiti.oracle.com
http://asktom.oracle.com
Simple Talk Publishing have just set up http://www.oracleoverflow.com/, which is a dedicated Stack Exchange site. You could try posting your questions there?