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Key-Value Store
Key-Value Store
In Oracle Non-SQL Database
Lei Zhang
Introduction
Background
Non-SQLSQL Database
Key-Value Database
Oracle Non-SQL Database
Background
History of Database
Information Management System
Relational Database Management System
Oracle New Non-SQL Database
Non-SQL Database
What is Non-SQL Database?
not only SQL.
a broad class of?DMS?that differ from the classic model of the (RDBMS).
not require fixed?table schemas.
Non-SQL Database
Document store
Graph
Key-Value store
Eventually‐consistent key‐value store
Hierarchical key-value store
Ordered key-value stores
Object database
Key-Value Database
Key-Value Database
queries?faster
store?large volumes of data?
support high-concurrency
very suitable for?query by?primary key
Complex?query?conditions
Real-Time Search Engine
Key-Value Database
Thousands of?concurrent connections, the?easier?to?achieve high-speed?queries
MySQL
After hundreds of?concurrent connections?, it?basically?collapsed.
Oracle NoSQL Database
distributed key/value pair storage
data is stored as key-value pairs, which are written to particular storage node(s), based on the hashed value of the primary key
Oracle NoSQL Database
Features
Simple Data Model
Scalability
Predictable behavior
High Availability?
Easy Administration
KV Store
A collection of Storage Nodes which host a set of Replication Nodes.
Given a traditional three-tier web architecture
Takes the place of your back-end database
Runs alongside it
KV Store
Replication Nodes and Groups
Partitions
Each replication group contains one or more partitions.
Key-value pairs in the store are organized according to the key. Keys, in turn, are assigned to a partition.
Can not be moved
Assigns keys evenly across all the available partitions
Balancing the Store
The entire store is balanced if every Storage Node is balanced
In order for the entire store to become balanced, the number of Storage Nodes in the group must be an exact multiple of the stores Replication Factor.
Access and Securi
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