Define Tuple?
Finite ordered list of elements is called as tuple.
What Kind Of Data, Cube Contain?
The Cube will contain the following data:
3 Fact fields: Sales, Costs and Discounts
Time Dimension: with the following hierarchy: Year, Quarter and Month
2 Customer Dimensions: one with location (Region, Country) and the other with Customer Group and Customer Name
Product Dimension: containing a Product Name
Differentiate Between Transformations And Jobs?
Transformations is moving and transforming rows from source to target.
Jobs are more about high level flow control.
How To Do A Database Join With Pdi?
If we want to join 2 tables from the same database, we can use a “Table Input” step and do the join in SQL itself.
If we want to join 2 tables that are not in the same database. We can use the the “Database Join”.
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How To Sequentialize Transformations?
it is not possible as in PDI transformations all of the steps run in parallel. So we can’t sequentialize them.
How We Can Use Database Connections From Repository?
We can Create a new conversion or close and re-open the ones we have loaded in Spoon.
How Do You Insert Booleans Into A Mysql Database, Pdi Encodes A Boolean As ‘y’ Or ‘n’ And This Can’t Be Insert Into A Bit(1) Column In Mysql.?
BIT is not a standard SQL data type. It’s not even standard on MySQL as the meaning (core definition) changed from MySQL version 4 to 5.
Also a BIT uses 2 bytes on MySQL. That’s why in PDI we made the safe choice and went for a char(1) to store a boolean. There is a simple workaround available: change the data type with a Select Values step to “Integer” in the metadata tab. This converts it to 1 for “true” and 0 for “false”, just like MySQL expects.
By Default All Steps In A Transformation Run In Parallel, How Can We Make It So That 1 Row Gets Processed Completely Until The End Before The Next Row Is Processed?.
This is not possible as in PDI transformations all the steps run in parallel. So we can’t sequentialize them. This would require architectural changes to PDI and sequential processing also result in very slow processing.
Is Pentaho A Trademark?
Yes, Pentaho is a trademark.
What Do You Understand By Pentaho Metadata?
Pentaho Metadata is a piece of the Pentaho BI Platform designed to make it easier for users to access information in business terms.
How Does Pentaho Metadata Work?
With the help of Pentaho’s open source metadata capabilities, administrators can outline a layer of abstraction that presents database information to business users in familiar business terms.
What Is The Pentaho Reporting Evaluation?
Pentaho Reporting Evaluation is a particular package of a subset of the Pentaho Reporting capabilities, designed for typical first-phase evaluation activities such as accessing sample data, creating and editing reports, and viewing and interacting with reports.
Explain Mdx?
Multidimensional Expressions (MDX) is a query language for OLAP databases, much like SQL is a query language for relational databases. It is also a calculation language, with syntax similar to spreadsheet formulas.
Why Can’t We Duplicate Fieldnames In A Single Row?
we can’t. if we have duplicate fieldnames. Before PDI v2.5.0 we were able to force duplicate fields, but also only the first value of the duplicate fields could ever be used.
What Are The Benefits Of Pentaho?
1. Open Source
2. Have community that support the users
3. Running well under multi platform (Windows, Linux, Macintosh, Solaris, Unix, etc)
4. Have complete package from reporting, ETL for warehousing data management,
5. OLAP server data mining also dashboard.
Differentiate Between Arguments And Variables?
Arguments are command line arguments that we would normally specify during batch processing .
Variables are environment or PDI variables that we would normally set in a previous transformation in a job.
What Are The Applications Of Pentaho?
1. Suite Pentaho
BI Platform (JBoss Portal)
Pentaho Dashboard
JFreeReport
Mondrian
Kettle
Weka
2. All build under Java platform
What Are The Steps To Decrypt A Folder Or File?
Right-click on the folder or file we want to decrypt, and then click on Properties option.
Click the General tab, and then click Advanced.
Clear the Encrypt contents to secure data check box, click OK, and then click OK again.
Explain Encrypting File System?
It is the technology which enables files to be transparently encrypted to secure personal data from attackers with physical access to the computer.
What Do You Mean By Repository?
Repository is a storage location where we can store the data safely without any harmness.
Explain Why We Need Etl Tool?
ETL Tool is used to get data from many source system like RDBMS, SAP, etc. and convert them based on the user requirement. It is required when data float across many systems.
What Is Etl Process? Write The Steps Also?
ETL is extraction , transforming , loading process the steps are :
1 – define the source
2 – define the target
3 – create the mapping
4 – create the session
5 – create the work flow
What Is Metadata?
The metadata stored in the repository by associating information with individual objects in the repository.
What Are Snapshots?
Snapshots are read-only copies of a master table located on a remote node which can be periodically refreshed to reflect changes made to the master table.