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Azure Knowledge > Cosmos DB > Flashcards

Cosmos DB Flashcards

1
Q

atom-record-sequence

A

Core type system for CDB engine. CDB translates your data models into ARS

  • atom - primitive types
  • record - structs
  • sequences - arrays
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2
Q

What are the consistency levels of CosmosDB?

A
  • Strong
  • Bounded Staleness
  • Session
  • Consistent Prefix
  • Graph-based data
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3
Q

What do the different CosmosDB APIs allow you to do?

A

Use your existing API calls with CosmosDB. For example, CQL code to access Apache Cassandra DB can be simply ported over for use against CosmosDB

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4
Q

Difference between Azure Table storage and CosmosDB?

A

Azure Table storage is the predecessor of CosmosDB

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5
Q

Use cases for CosmosDB

A

Web, mobile, gaming, IoT apps that handle massive amounts of reads and writes at a global scale

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6
Q

Graph database

A
  • Persist relationships in the storage layer
  • Both entities(Nodes, AKA vertices) and their relationships(Edges, AKA Labels) to other entities are stored together using Properties(Somewhat like tags)
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7
Q

When Product A. is purchased, products C and D are usually purchased with it. You want to use these to make recommendations to your customers. What is the CosmosDB database/API type that should be used?

A

Graph

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8
Q

What does “multi-model” database service mean?

A

There are more than one data access methods (APIs) to access your data. (E;G., CosmosDB is multi-model)

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9
Q

How does the charging structure work for a CosmosDB table and why?

A

Charging is done by current capacity specified, regardless of the amount of data stored. This is because the capacity is reserved.

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10
Q

What are the 2 methods of migrating data to CosmosDB?

A
  • CosmosDB Data Migration Tool

* AzCopy

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11
Q

Graph Database

A

One of the models supported by Cosmos DB.
Non-tabular format
Relationships are treated as data rather than schema structure

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12
Q

What is a Graph?

A

The essential structure of a graph database.
Comprised of

  • Vertices/Nodes - represent objects
  • Edges/Relationships - Relationships between vertices
  • Properties - descriptors of vertices and edges
  • Vertice Properties - description of the object
  • Edge Properties - description of the relationship
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13
Q

What is the general way to define your Nodes and Edges in a graph database?

A

Nodes = nouns

  • Customer
  • Employee
  • Product
    Relationships = verbs
  • Likes
  • Places
  • Belongs To
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14
Q

BCDR

A

Business Continuity and Disaster Recovery

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15
Q

Multi-master support

A
  • AKA multiple write regions
  • Every region defined as a write region is considered a master
  • data changes are automatically propagated with single digit latency
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16
Q

Multi-master conflict resolution modes

A
  • Last-Writer-Wins(LWW) - User defined integer value
  • Custom (User Defined Function) - User defined stored proc
  • Custom (Async) - Conflicts logged and handled at the app level
17
Q

Multi-region failover

A
  • Only applies to single write regions
  • Read region outages take that region offline and redirect traffic
  • Write region outages mark the master offline and promote another region to master
18
Q

Types of data consistency offered

A
  1. Strong
  2. Bounded staleness (set interval lag)
  3. Session Scoped to client session most widely used
  4. Consistent Prefix - reads see writes in order
  5. Eventual Session to eventual 2x less expensive
19
Q

Key metrics of Cosmos DB to take into consideration

A
  • Total Requests
  • Total Throughput
  • Total Storage
20
Q

R/U

A
  • Request Unit.

* The amount of CPU, disk I/O and memory required to read 1KB of data in 1 second

21
Q

An Cosmos DB ____ is a container for one or more databases. A Cosmos DB ____ is a container for one or more collections. A ____ contains documents. A ____ is an unstructured set of key/value pairs read and written in a JSON format

A

Account
database
collection
document

22
Q

Partitioning

A

Distributing data across underlying resources based on a predefined partition key (E;G., combination of property keys in a document like person and category)

23
Q

Given the following requirement, what is the R/U requirement

  • 25 docs/second
  • 20 RUs/doc
A

500 R/Us (25 x 20)

24
Q

Once a partition is defined, how are documents placed into a particular partition?

A

Automatically by Cosmos DB

25
Q

A partition key is a ____ ____. Documents with the same partition key are always…

A
  1. document property

2. stored on the same logical partition

26
Q

What is a partition hot-spot and what is the risk of having one?

A
  • A partition key that does not evenly divide data across partitions
  • Hot partitions can overload the R/Us assigned to that partition and cause throttling
27
Q

CosmosDB Indexing Modes

A
  • Consistent - updated with every new doc
  • Lazy - reads/writes take priority over updating the index
  • None

Azure Knowledge (6 decks)

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