Mongo db1
- 1. VANDANA B.Tech CS 3rd yr Roll No.9072
- 2. First developed by the software company MongoDB Inc. in October 2007 as a component of a planned platform as a service product. The company shifted to an open source development model in 2009. In just 5 yrs. In 24 AUG. 2015 MongoDB has evolved into one of the world’s most popular database.
- 3. MongoDB is a cross - platform, Document oriented database . MongoDB supports JSON like documents with dynamic schemas. MongoDB supports indexing.
- 4. RDBMS MongoDB Database Database Table Collection Tuple/Row Document Column Field Table Join Embedded Documents Primary Key Primary Key (Default key_id provided by mongodb itself)
- 13. Schema less No complex joins Deep-Query ability Easy to Scale-out Uses internal memory for storing working set
- 14. Create database > use DATABASE_NAME >use mydb switched to db mydb >db mydb >show dbs local 0.78125GB test 0.23012GB >db.first.insert({“name”:”my first document”}) >show dbs local 0.78125GB mydb 0.23012GB test 0.23012GB
- 15. Drop Database >use mydb >db.dropDatabase() >{“dropped” : ”mydb”, ”ok” : 1}
- 16. IN MONGODB IN RDBMS
- 18. In MongoDB In RDBMS
- 19. Sharding is a method for storing data across multiple machines. Purpose of sharding is that database with large data set exceed the storage capacity of the server. So,database have 2 basic approaches: 1.Vertical scaling 2. Sharding
- 22. Sharding partitions a collection’s data by shard key. MongoDB divides shard key values into chunks and distributes chunks evenly across shards. MongoDB uses either Range based paritioning or hash based partitioning.
- 25. The addition of new data can result in data distribution imbalances within the cluster. So to maintain MongoDB ensures two background processes: 1.Splitting 2.Balancing
- 26. Replication provides redundancy and increases data availability. . There is only one primary database allows write operation. . Multiple secondary database servers only for read operation. . Arbiter doesn’t store data. It used during failover to decide which server will be next primary server.
- 28. Document Oriented Storage Disaster Recovery Auto – Sharding Indexing GridFS