Looker Interview Questions for Freshers/Looker Interview Questions and Answers for Freshers & Experienced

What do you mean by package deployment in SSIS?

In SSIS, we have a file tagged as the manifest file. In fact, it should run along with the operation. It always assures reliable or authorized information for the containers and without policy violation. Users can deploy the same in the File system or into the SQL Server according to the allocation or requirements.

Name the approaches that we have to examine for data cleaning?

The first thing we have to consider is data size. If the data size is too big, we must categorize it into tiny components. Studying the overall statistics is another way that we can implement. Developing utility functions are also helpful and reliable.

What is the purpose of the “Rebuild Derived tables and Run button”?

We use the “Rebuild Derived tables and the Run button for beginning a rebuild of all the persistent derived tables covered in the query. We also use this for launching the rebuild of all the upstream PDTs.

What is the cost of Looker?

Looker costs $35/user/month for on-premise deployment and $42/user/month if deployed within the cloud.

Can I persist a derived table with a datagroup that's *not* included in the model the derived table is used in?

No, you cannot. If a derived table is persisted by datagroup_trigger, that datagroup needs to be defined in every model that derived table is used in. If a datagroup isn't defined in a model that a derived table is used in, you'll get the following error:
invalid datagroup_trigger {datagroup_name} declared for {derived_table_name}

What does SQL runner do?

SQL runner gives direct access to your database and supports that access in different ways. SQL runner also creates and explores the queries.

What is Slicing?

Slicing is a process that always makes sure that the data is at its defined location or position and makes sure there are no errors in the data.

List the operating systems that Looker supports?

Below are the operating systems that Looker supports:

Windows
Mac
Linux

What is the security difference between Tableau and Looker?

* Tableau gives security to your data at any level.
* In looker, the user has to change the security settings according to their requirements.

What are the requirements for using custom visualizations?

Enable the Sandboxed Custom Visualizations Labs Feature in the admin panel. Install the custom JavaScript visualizations in the Visualizations page. Also, ensure that you have the latest version of the Chromium renderer.

What are the essential qualities that an expert data analyst must have?

The first essential skill for a data analyst expert is collecting, distributing, and organizing massive data without involving accuracy. The second important skill is having an in-depth understanding of the course. Having technical proficiency in the database domain is also helpful at different levels. Besides this, a data analyst should also have qualities like patience and leadership.

Does log have any association with the packages?

Yes, the log is closely associates with the package deal stage. Even when there is a need for the configuration, the same is implemented only on the package deal degree.

What is data cleansing?

Data cleansing is nothing but another name for the data cleaning process. Usually, there are a lot of ways to eliminate the errors and inconsistencies from the datasets. A blend of these approaches is considered data cleansing. The target of all these approaches is to advance the data quality.

What are the common issues within the data that can create trouble for data analysts?

One of the biggest trouble creators is duplicate entries. Although this can be eliminated, there is no complete accuracy possible. This is because the same data is generally available in different sentences or different formats.

The second biggest trouble is a common misspelling. Also, varying values can create a lot of issues. Values that are unlawful, missing, and cannot be recognized can enhance the possibilities of multiple errors and affect the quality up to a great range.

Are you familiar with the cache modes available in Looker? How many of them are present in it?

There are three modes essentially and all are similarly ground-breaking. These are Full reserve mode, mostly store mode, and No reserve mode.

What are the methods that can be deployed for data validation?

There are two standard methods that can be deployed for data validation they are:

* Data screening
* Data validation

These two methods are similar but include different applications.

According to you, what are the important qualities that an expert data analyst should possess?

The first and most important skill for an expert data analyst is the right skills to collect, organize, and distribute big data without comprising accuracy. The second most important thing to have is high-level knowledge of the course. Technical expertise in the database domain is also needed in various stages. In addition to this, a data analyst must also have qualities like leadership and patience.

Can we base a table calculation on a particular pivoted column?

Yes, we can base a table calculation on a particular pivoted column using the pivot_where function. The column given for the pivot_where field specifies that it should be targeted for calculation.

Does the sort order matter when using an offset list function?

The sort order is very important when using an offset list function. It defines whether to go up the table or down the table.

What is the use of the “Rebuild Derived tables and Run” button?

The “Rebuild Derived tables and Run” button is used to initiate a rebuild of all persistent derived tables included in the query. This is also used to start a rebuild of all upstream PDTs.

Can we use templated filters in PDTs?

Looker Blocks are the pre-built sections of LookML code that quicken the analytics. We can use these looker blocks and customize them for your specifications. They allow us to build flexible and fast analytics.

Explain user flow analysis by heap in Looker

Heap captures user behavior like clicks, taps, gestures, and more across websites and applications automatically. It allows data enrichment with custom APIs. This will help in analyzing user actions and present them visually.

List the types of Looker blocks?

There are six different types of Looker block they are:

* Source blocks
* Analytic blocks
* Data tools
* Data blocks
* Viz blocks
* Embedded blocks

What is drill-down analysis?

Drill-down is a capability given by many Business Tools. This helps to view the data in a detailed manner and provides in-depth penetrations. We can drill down over a component within a dashboard or report to get more granular details.

Is it possible for the businesses to utilize the same resources for Business Intelligence or they need experts?

All things considered, it really relies upon the business. The vast majority of the associations have acknowledged there is quite required for this. The present workforce can without much of a stretch be prepared and the most wanted results can undoubtedly be normal. The truth of the matter is it doesn’t require some investment to prepare the representatives on this area. Since BI is a straightforward technique, associations can without much of a stretch keep up the pace in each angle.

Can I use templated filters in PDTs?

These are Transformations, Data Sources, and Data Destinations. Clients can likewise characterize different classifications on the off chance that the need for the same is figured it out. In any case, it is absurd that all the highlights deal with that specific classification.

Name a few approaches that we have to consider for the data cleaning?

The first thing that we have to consider is the data size. If the data size is too large, it should be classified into small components. Examining the summary statistics is another approach that we can deploy. Building utility functions are also very beneficial and reliable.

Give the differences between no-cache mode and partial cache mode

The no-cache mode is used when the reference data set is very large to load into memory. The partial cache mode is used when the size of the data is relatively small. The lookup index in the partial cache mode is well-indexed and gives faster responses.

What do you know about the term Logistic Regression?

Logistic Regression is an approach recognized for the accurate verification of a dataset that incorporates impartial variables. The verification level depends on how accurately the final results depend on these variables. It is not continually clean to change them once defined.

Which container within the package is allowed for logging of data to a package log?

Every task or container is allowed to do this. Yet, they are required to be allowed during the primary stage of the operation.

List a few tools that we can deploy for Data Analysis?

Few tools that we can deploy for data analysis are:

* Node XL
* RapidMiner
* KNIME
* SOLVER
* Wolfram Alpha
* Tableau
* Fusion Tables by Google

Explain the term OLPA?

OLPA is abbreviated as On-Line Analytical Processing and a strategy that is used for organizing multidimensional data. Although the principal goal is to analyze data, the applications can also be handled if the same is realized.

Does the log have any relation with the packages?

Yes, they are very closely connected with the package deal stage. Even while there is a requirement for the configuration, the same is executed only upon the package deal degree.

What are the important steps in an analytics project?

Few important steps in an analytics project are:

* Data exploration.
* Defining problems and solutions.
* Tracking and implementation of data.
* Data modeling.
* Data validation.
* Data preparation.

Explain about full cache mode

Full cache mode is the default cache mode selection. The reference result set will be cached before the execution. It will then retrieve and store the entire set of data from the specified lookup location. Full cache mode is best used when we have to deal with a large data set.

Explain pivoting?

Pivoting is a process of switching the data from row to column and vice versa. Pivoting makes sure no data is left on either column or row when the user exchanges the same.

Explain the term drilling in data analysis?

It is primarily an approach that is used for examining the details of the data that resembles usefulness. It can also be considered to eradicate all the issues such as copyright and authenticity.

What are the cache modes available?

There are three modes available in Looker.

* Full cache mode - All the values will be cached.
* Partial cache mode - Only the distinct values will be cached.
* No-cache mode - No data will be cached.

Which one among File System Deployment and the SQL server deployment better?

The SQL Server Deployment is preferred when compared to File System Deployment. The processing time is faster, so it gives quick results. It also won't compromise the safety of the data.

Explain about OLTP

Online transaction processing (OLTP) supports data processing of transaction-oriented applications. It focuses on the day to day transactions of an organization. It involves updating, inserting, deleting small chunks of data in a database. Since it operates on data of small size, the processing speed is faster.

What are the advantages of Looker BI?

Here are some of the many advantages of Looker BI.

* It generates a base model so we can work on the relationships
* All the employees in an organization can have a centralized view of metrics
* We can create easy to read dashboards that allow users to find patterns
* It connects directly to the database instead of loading the data from it
* We can share the generated reports across the organization

What do you mean by Looker BI?

Looker's business intelligence software helps in exploring and analyzing data. We can combine data from different sources and create a unified view. We can then build real-time analytics on top of the data and share them easily. It offers great visualizations and drill-down dashboards.

What are the advantages of Looker?

Data visualization: data is visually present for easy interpretation.

Analytics: information is evaluated and quantified for a portrait of the organization’s trends and future possibilities.

Document management: looker converts reports into different file formats and shares analytical findings.

Integrations: the capacity to connect with other systems gives various functionalities and sources.

Is it possible for the business to use the same resource for Business Intelligence, or do they need experts?

Well, it depends on the type of business. Most of the companies have recognized there is no need for this. The prevailing workforce can simply be trained, and the most desired outcomes can indeed be expected. The fact is it does not take a lot of time to train the employees within this domain. Because BI is a simple strategy, companies can easily keep up the pace in every phase.

List the cache modes available in looker?

There are three cache modes available in Looker they are:

1. Full reserve mode.
2. Mostly store mode.
3. No reserve mode.

What are the various categories of data flow?

There are three different categories of data flow they are:

Sources: these sources can be XML files, excel files, Relational database, and flat files, etc.

Transformations: this filters the database over some calculations, modifies the format of data, etc.

Destinations: these destination files can be flat files, XML files, relational database, PDF files, etc.

Is it possible for businesses to utilize the same resources for Business Intelligence, or do they need experts?

Well, it actually depends on the business. Most of the organizations have realized there is actually no need for this. The current workforce can easily be trained, and the most desired outcomes can easily be expected. The fact is it doesn’t take a lot of time to train the employees in this domain. Because BI is a simple strategy, organizations can easily keep up the pace in every aspect.

What are the three categories in the data flow?

These arem0 Transformations, Data Sources, and Data Destinations. Users can also define other categories in case the need for the same is realized. However, it is not possible that all the features work in that particular category.

What do you mean by the SSIP? Does it have any direct relation with the SQL server?

SSIP stands for SQL server integration services. When it comes to performing some important tasks related to both ETL and migration of data, the same is widely adopted. Basically, it is very useful to enable the automatic maintenance of the SQL server, and that is why it is considered to have a close relationship with the SQL server. Although maintenance is not required regularly, this approach is highly beneficial.

What is business intelligence?

Business Intelligence is nothing but the combination of approaches that an organization uses for data analysis. The useful data can easily be generated from the bulk information that seems totally useless. The biggest benefit of generating the data is that information and decisions can easily be build up. Many organizations have attained a ton of success because of no other strategy than this. Business intelligence makes sure that one can impose a limit on the competition up to a good extent. There are several other issues that can also be eliminated by gathering very useful information from sources that seem highly unreliable.

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