Episode 2 : MongoDB aur Cassandra ke Beech ka Jaadu

A New Tale from DataGaav: MongoDB aur Cassandra ke Beech ka Jaadu

Ek din, DataGaav mein ek naye magician aaye, jinka naam tha Cassandra Baba. Bacche abhi tak Mongo Baba ka jaadu seekh rahe the, tabhi Cassandra Baba ne apna alag jaadu dikhaya. Yeh kahani hai MongoDB aur Cassandra ke beech ke differences ko samajhne ki, aur kuch naye MongoDB concepts ko explore karne ki.

10) Differentiate MongoDB and Cassandra?

11) Explain the primary and secondary replica set?

12) Which languages can we use with MongoDB?

13) Explain Storage Encryption?

14) Explain Primary and Secondary Replica Sets?

15) What is the importance of GridFS and Journaling?

16) How to do locking or transactions in MongoDB?

MongoDB aur Cassandra ka Difference

Mongo Baba aur Cassandra Baba ke jaadu mein kuch khaas differences the:

1. Data Model:

   • MongoDB: Document-oriented NoSQL database, jo JSON-like documents mein data store karta hai.
   • Cassandra: Column-family NoSQL database, jo key-value pairs mein data store karta hai, aur har row mein multiple columns ho sakte hain.

2. Schema:

   • MongoDB: Schema-less, yaani data ka structure har document ke liye alag ho sakta hai.
   • Cassandra: Schema-based, yaani har row ka structure predefined hota hai.

3. Scalability:

   • MongoDB: Horizontal scalability ke liye sharding ka use karta hai.
   • Cassandra: Fully distributed architecture, jisme automatic sharding aur replication hota hai.

4. Consistency:

   • MongoDB: Eventual consistency by default, lekin read/write preferences ko adjust karke strong consistency achieve kar sakte ho.
   • Cassandra: Tunable consistency, jisme tum consistency level ko apne hisaab se adjust kar sakte ho.

5. Query Language:

   • MongoDB: Queries JSON-like syntax mein likhte hain, aur MongoDB query language ka use karte hain.
   • Cassandra: Cassandra Query Language (CQL) ka use hota hai, jo SQL se milta-julta hai.

MongoDB ke Primary aur Secondary Replica Sets ka Jaadu

Mongo Baba ne bacchon ko ek aur jaadu sikhaya, jise kehte hain Replica Sets. Bacche curious the, aur unhone Mongo Baba se puchha:

11. Primary and Secondary Replica Sets kya hote hain?

• Primary Replica Set: MongoDB cluster mein ek primary node hoti hai jo saare write operations ko handle karti hai. Baaki sab secondary nodes primary node ko replicate karte hain.
• Secondary Replica Set: Secondary nodes ka kaam hota hai data ko primary node se sync karna. In nodes se tum read operations kar sakte ho, agar tum read preference set karo.

MongoDB ke Saath Compatible Languages

Cassandra Baba ne bhi apna contribution diya aur bataya ki MongoDB ke saath kaun-kaun si languages use kar sakte ho: 12. Languages Supported by MongoDB:

• JavaScript
• Python
• Java
• C#
• C++
• Ruby
• PHP
• Go
• Node.js
• And many more!

MongoDB Storage Encryption ka Jaadu

Mongo Baba ne ek aur secret reveal kiya: Storage Encryption. 13. Storage Encryption kya hota hai?

• MongoDB mein Storage Encryption ka use karte hain taaki data ko disk par encrypted form mein store kiya ja sake. Yeh ensure karta hai ki agar koi unauthorized access mile, toh data safe rahe.

GridFS aur Journaling ka Importance

14. Bacchon ne Mongo Baba se GridFS aur Journaling ke baare mein pucha:

• GridFS: Jab tumhara file size 16MB se zyada ho, tab MongoDB GridFS ka use karta hai. Yeh large files ko multiple chunks mein tod kar store karta hai.
• Journaling: Yeh feature MongoDB ko crash recovery mein madad karta hai. Journaling ensure karta hai ki agar koi unexpected shutdown ho, toh data loss na ho.

Locking aur Transactions ka Jaadu

15. Bacchon ka agla sawal tha: MongoDB mein Locking aur Transactions kaise hoti hain?

• Locking: MongoDB mein locking at the document level hoti hai, yaani multiple documents ko ek hi samay par modify kiya ja sakta hai bina kisi conflict ke.
• Transactions: MongoDB multi-document ACID transactions support karta hai. Yeh ensure karta hai ki saare operations ek atomic unit ke roop mein perform hon, ya toh saare succeed karein ya saare fail.

Climax: MongoDB ke Jaadu ka Antim Kissa

Jaise hi Cassandra Baba ne apna jaadu khatam kiya, Mongo Baba ne ek last magical command bacchon ke saath share ki:

16. Agar tum MongoDB ke saare databases ko ek JavaScript array mein store karna chaahte ho, toh yeh jaadu use karo:

var databases = db.adminCommand('listDatabases').databases;

Yeh command tumhare saare databases ko list karke ek array mein store karega.

Antim Jaadu: Bacchon ki Seekh

Is jaadu ke kisse ke baad, DataGaav ke bacchon ne MongoDB aur Cassandra dono ke jaadu seekh liye. Ab DataGaav ke bacche data ko handle karne mein aur bhi tez ho gaye the, aur unhone apne data ko MongoDB aur Cassandra jaise tools ke saath efficiently manage karna seekh liya.

Yeh kissa bhi yahin khatam hota hai, lekin Mongo Baba aur Cassandra Baba ke jaadu DataGaav mein hamesha yaad rahenge.