Published on March 10, 2014
Data Model • Relation • The Dominant Data Model of Last Couple Decade • Table, Column, Rows • Cannot Nest One Tuple Within Another • Aggregate • Collection of related object that we wish to treat as a unit • Consistency Unit
Relational Data Model
Aggregate Data Model
• Aggregate-Ignorant • Relational Data Model • Graph • Aggregate-Oriented • Key-Value • Document • Column Family Data Model Types
Distribution Model • Single Server • Sharding (Horizontal Scalability) • Put different data on different node. • Replication • Take the same data and copies it over multiple node.
Combining Sharding and Replication
Combining Sharding and Replication
Update Consistency • Write-Write Conflict • Lost Update • Pessimistic Consistency • Optimistic Consistency
Relaxing Consistency • Eventual Consistency • Quorums • CAP Theorem • Consistency • Availability • Partition Tolerance
Key-Value Group A
What's Key-Value Store • Simple Hash Table • Collection of Key-Value Pair • Associate Array • The Key Unique Within Collection
Basic Operation • Insert Pair • Delete Pair • Update Value Of Existing Pair • Find Value Associate With a Particular Key
Performance Factor • The efficiency of the hashing function. • The design of the keys and the size of the values being stored and retrieved. • The distribution of data across partitions. • The functional patterns that applications follow to store and retrieve data.
Storing All the Data in a Single Bucket
Terminology – Oracle vs. Riak
Some of The Popular Key-Value Databases • Redis • Riak • Memcache DB • BerkeleyDB • HamsterDB • Amazon DynamoDB • Project Voldemort
Key-Value Store Features • Consistency • Consistency is applicable only for operations on a single key • Eventually Consistent in Distribute Implementation • Transaction • Quorum • Query • Structure Of Data • Scaling • Sharding • CAP
Suitable Use Case • Storing Session Information • User Profiles, Preferences • Shopping Cart Data
When Not to Use • Relation Among Data • Multioperation Transactions • Query by Data • Operations by Sets
Distributed, Masterless, Highly-Available Key-Value Store
Redis Features • Extremely Fast! • Ability to store more than just strings • Persistence • Replication • Built in LUA support
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