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Questions and Answers
What makes data lakes appealing for organizations with diverse skills and tools?
What makes data lakes appealing for organizations with diverse skills and tools?
Why is replication useful in cloud data lakes?
Why is replication useful in cloud data lakes?
What is the purpose of lifecycle policies in cloud data lakes?
What is the purpose of lifecycle policies in cloud data lakes?
How does cloud data lakes affect costs?
How does cloud data lakes affect costs?
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What is an advantage of having a single storage layer in cloud data lakes?
What is an advantage of having a single storage layer in cloud data lakes?
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What is the benefit of decoupled storage versus compute in cloud data lakes?
What is the benefit of decoupled storage versus compute in cloud data lakes?
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What is a benefit of cloud data lakes in terms of storage?
What is a benefit of cloud data lakes in terms of storage?
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What is the foundation of the Apache Spark ecosystem?
What is the foundation of the Apache Spark ecosystem?
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What type of SQL does Spark SQL support?
What type of SQL does Spark SQL support?
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How can you query a Delta table in PySpark?
How can you query a Delta table in PySpark?
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What is the purpose of the Spark SQL library?
What is the purpose of the Spark SQL library?
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What is the interface that analysts and report builders typically use to interact with data?
What is the interface that analysts and report builders typically use to interact with data?
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What is the benefit of using Spark SQL?
What is the benefit of using Spark SQL?
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What is the relationship between Spark SQL and the DataFrame API?
What is the relationship between Spark SQL and the DataFrame API?
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What is the purpose of the %sql magic command in notebooks or IDEs?
What is the purpose of the %sql magic command in notebooks or IDEs?
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What is the primary purpose of the Bronze layer in the Medallion architecture?
What is the primary purpose of the Bronze layer in the Medallion architecture?
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What is a key characteristic of the Silver layer?
What is a key characteristic of the Silver layer?
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What is the primary focus of the Gold layer?
What is the primary focus of the Gold layer?
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What type of data models are used in the Gold layer?
What type of data models are used in the Gold layer?
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What is the purpose of data quality checks in the Silver layer?
What is the purpose of data quality checks in the Silver layer?
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What type of transformations are applied in the Gold layer?
What type of transformations are applied in the Gold layer?
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How is data typically stored in the Bronze layer?
How is data typically stored in the Bronze layer?
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What is the primary focus of the Bronze layer?
What is the primary focus of the Bronze layer?
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What is the purpose of the Medallion architecture?
What is the purpose of the Medallion architecture?
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What type of modeling is used in the Silver layer?
What type of modeling is used in the Silver layer?
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What is one of the benefits of using time travel in machine learning models?
What is one of the benefits of using time travel in machine learning models?
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What is the primary goal of using Delta Lake in an organization?
What is the primary goal of using Delta Lake in an organization?
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What is the primary benefit of using a lakehouse architecture in machine learning?
What is the primary benefit of using a lakehouse architecture in machine learning?
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Which of the following is NOT a feature of the Spark ecosystem?
Which of the following is NOT a feature of the Spark ecosystem?
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What is the primary role of a lakehouse environment in machine learning?
What is the primary role of a lakehouse environment in machine learning?
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What is the relationship between Delta Lake and a lakehouse architecture?
What is the relationship between Delta Lake and a lakehouse architecture?
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What is the primary benefit of using a high-performance query engine in a lakehouse environment?
What is the primary benefit of using a high-performance query engine in a lakehouse environment?
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What is the primary role of Apache Spark in a lakehouse environment?
What is the primary role of Apache Spark in a lakehouse environment?
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What is the main characteristic of the data in a cloud-based data lake?
What is the main characteristic of the data in a cloud-based data lake?
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Which of the following is NOT a characteristic of a cloud-based data lake?
Which of the following is NOT a characteristic of a cloud-based data lake?
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What type of data processing is supported in the data lake?
What type of data processing is supported in the data lake?
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Which of the following is a cloud-based data storage provider?
Which of the following is a cloud-based data storage provider?
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What is the data in the curated layer?
What is the data in the curated layer?
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Study Notes
Data Lakes
- Data lakes offer simple integration through standardized APIs, allowing users with different skills, tools, and programming languages to perform various analytics tasks simultaneously.
Replication
- Cloud providers offer easy setup of replication to different geographical locations for data lakes, useful for meeting compliance requirements, failover for business-critical operations, disaster recovery, and minimizing latency.
Availability
- Cloud systems offer different types of data availability for cloud data lakes, allowing for lifecycle policies to move data across different storage availability classes for compliance, business needs, and cost optimization.
- Availability can be defined through service-level agreements (SLAs), guaranteeing a minimal level of service, typically greater than 99.99% uptime for business-critical resources.
Cost
- With cloud data lakes, users typically pay for what they use, and costs always align with data volumes.
- A single storage layer, minimal data movement, and decoupled storage versus compute minimize costs for data storage.
Apache Spark Ecosystem
- The Apache Spark ecosystem consists of different libraries, with Spark Core and Spark SQL engine as the substrate.
- Spark SQL supports ANSI SQL, allowing users to query and analyze data using SQL syntax.
- Spark SQL library allows users to interact with datasets and tables using the DataFrame API.
- Time travel enables easy auditing or reproduction of machine learning models.
Lakehouse Architecture
- The lakehouse architecture bridges the gap between data engineers and data scientists, unifying workloads and reducing silos.
- The architecture enables organizations to build and manage machine learning models in a faster, more efficient way.
Medallion Architecture
- The medallion architecture consists of Bronze, Silver, and Gold layers.
- Bronze layer: landing zone for raw data, no schema required, fast and easy to get new data.
- Silver layer: first layer useful to the business, prioritizes speed to market, enables data discovery, self-service, ad hoc reporting, advanced analytics, and ML.
- Gold layer: data is in a format easy for business users to navigate, prioritizes business use cases, highly performant, and pre-calculated, business-specific transformations.
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Description
Data lakes offer simple integration and cloud providers offer easy replication to different geographical locations for data lake management.