Summary of NoSQL Databases

NoSQL Databases: A Summary

Feature	Key-Value Store	Document Store	Column Family	Graph Database
Data Model	Key-Value Pairs	Documents (JSON-like)	Columns	Nodes & Relationships
Schema	Schemaless	Flexible Schema	Flexible Schema	Flexible Schema
Use Cases	Caching, Session Data, Preferences	Content Management, User Profiles	Time Series Data, Sensor Data	Social Networks, Recommendation Systems
Advantages	- Fast Writes & Reads - Simple Scalability	- Flexible Data Structures - Powerful Queries	- Fast Reads for Specific Columns - Efficient Write Scalability	- Excellent for Connected Data - Visualization & Analysis
Disadvantages	- Limited Query Capabilities - No Relationships Between Data	- Complex Multi-Operation Transactions	- Complex Queries & Schema Changes	- Not Ideal for High Volume Transactions
Potential Users	Memcached, Redis, DynamoDB	MongoDB, CouchDB, DocumentDB	Cassandra, HBase	Neo4j, Cosmos DB

• SQL Support: Some NoSQL databases support SQL-like interfaces.
• ACID Compliance: Most NoSQL databases are not ACID compliant.

Choosing the Right NoSQL Database:

The best NoSQL database for your application depends on your specific needs. Consider factors like data model, query complexity, scalability requirements, and cost.

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M.Sc Computer Science Krishna University Data Science Notes

life cycle of a thread notes

 A thread life cycle is always in one of these five states. It can move from one state to another state. In Java, the life cycle of thread has five states.

1. Newborn State

2. Runnable State

3. Running State

4. Blocked State

5. Dead State

1. New : A thread begins its life cycle in the new state. It remains in this state until the start() method is called on it.
   Thread t = new Thread();

2. Runnable : After invocation of start() method on new thread, the thread becomes runnable.
   Thread t = new Thread();
   t.start();

3. Running : A thread is in running state if the thread scheduler has selected it.

t1.isAlive() - The isAlive() method returns true if the thread upon which it is called is still running otherwise it returns false.

4. Waiting : A thread is in waiting state if it waits for another thread to perform a task. In this stage the thread is still alive.

Example1:   t1.join() waiting for t1 to complete its execution

Example2:   The state of thread t1 after invoking the method sleep() on it - TIMED_WAITING

Thread.sleep(400);

5. Terminated : A thread enters the terminated state when it completes its task.

t1.stop()