What is NoSQL? NoSQL (“Not Only SQL”) databases store and retrieve data differently than relational databases.Designed for scalability, flexibility, and high performance .
Often used for big data, real-time applications, and distributed systems . Popular NoSQL Databases MongoDB – Document store, supports ACID transactions and aggregation framework.Redis – In-memory key-value store, supports caching, pub/sub, and Lua scripting.MongoDB Commands Database Management Commands Description show dbsList databases use myDatabaseSelect database db.createCollection("users")Create collection db.users.insertOne({ name: "Alice", age: 25 })Insert document db.users.insertMany([{ name: "Bob" }, { name: "Charlie" }])Insert multiple documents
Collection Management Commands Description db.createCollection(‘users’) Create a new collection db.getCollectionNames() List all collections db.users.renameCollection(‘customers’) Rename a collection db.users.drop() Drop a collection db.users.stats() Get collection statistics
CRUD Operations Commands Description db.users.insertOne({ name: ‘John’ }) Insert a single document db.users.insertMany([{ name: ‘Alice’ }, { name: ‘Bob’ }]) Insert multiple documents db.users.find() Find all documents db.users.findOne() Find a single document db.users.updateOne({ name: ‘John’ }, { $set: { age: 30 } }) Update a single document
Indexing Commands Description db.users.createIndex({ name: 1 }) Create an ascending index db.users.createIndex({ age: -1 }) Create a descending index db.users.getIndexes() List all indexes db.users.dropIndex(‘name_1’) Drop an index db.users.reIndex() Rebuild all indexes
Security & Authentication Commands Description db.createUser({ user: ‘admin’, pwd: ‘password’, roles: [‘readWrite’] }) Create a new user db.auth(‘admin’, ‘password’) Authenticate a user db.updateUser(‘admin’, { roles: [‘dbAdmin’] }) Modify a user’s roles db.getUsers() List all users db.dropUser(‘user’) Remove a user
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Redis Commands Connection & Server Commands Description PING Test connection (returns PONG) AUTH password Authenticate to the server SELECT index Change the selected database QUIT Close the connection INFO Get server information and statistics
Key Management Commands Description SET key value Set key to hold string value GET key Get value of key DEL key [key …] Delete one or more keys EXISTS key [key …] Check if key(s) exist EXPIRE key seconds Set key expiration time in seconds
Strings Commands Description SET key value Set string value of a key GET key Get string value of a key APPEND key value Append to string value of a key INCR key Increment integer value by 1 DECR key Decrement integer value by 1
Lists Commands Description LPUSH key value [value …] Prepend values to a list RPUSH key value [value …] Append values to a list LPOP key Remove and get first element RPOP key Remove and get last element LLEN key Get list length
Sets Commands Description SADD key member [member …] Add members to set SREM key member [member …] Remove members from set SMEMBERS key Get all members in set SISMEMBER key member Test if member is in set SCARD key Get set cardinality (size)
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