MongoDB basics - Create, Show and Drop Collections

1. What is the syntax to create a collection and drop a collection in MongoDB?
2. How do I show collections in MongoDB?
3. How do I create a collection in MongoDB?
4. How do I drop a collection in MongoDB?
5. How do you create a collection in PyMongo?
6. How do I remove all files from a collection in MongoDB?
7. Why show collections MongoDB not working?
8. Where are MongoDB files stored?
9. What is MongoDB collection?
10. How many collections can a MongoDB have?
11. What is DB collection?
12. How does MongoDB store data?

What is the syntax to create a collection and drop a collection in MongoDB?

3. Example of Create Collection in MongoDB

1. db. dataflair. insert( ...
2. db. createCollection(name, options) db.createCollection(name, options) ...
3. >use dataflair. switched to db dataflair. >db. ...
4. >show collections. mongodb. >show collections mongodb. ...
5. db. collection_name. drop() ...
6. >use dataflair. Switched to db dataflair. ...
7. >db. mongodb.

How do I show collections in MongoDB?

connect with the MongoDB database using mongo . This will start the connection. then run show dbs command.
...
List all collections from the mongo shell:

1. db. getCollectionNames()
2. show collections.
3. show tables.

How do I create a collection in MongoDB?

To insert a single document using MongoDB Compass:

1. Navigate to the collection you wish to insert the document into: ...
2. Click the Insert Document button: ...
3. For each field in the document, select the field type and fill in the field name and value. ...
4. Once all fields have been filled out, click Insert.

How do I drop a collection in MongoDB?

First, check the available collections into your database mydb.

1. >use mydb switched to db mydb >show collections mycol mycollection system. indexes tutorialspoint > Now drop the collection with the name mycollection.
2. >db. mycollection. drop() true > ...
3. >show collections mycol system. indexes tutorialspoint >

How do you create a collection in PyMongo?

How to Create Collection using PyMongo?

1. Create a client to the MongoDB instance.
2. Provide the name of the database to the client. It returns a reference to the Database.
3. Provide your new collection name as index to the database reference. It returns a reference to the Collection.

How do I remove all files from a collection in MongoDB?

To delete all documents in a collection, pass an empty document (). To limit the deletion to just one document, set to true. Omit to use the default value of false and delete all documents matching the deletion criteria.

Why show collections MongoDB not working?

This SHOW DBS command won't show the databases because you may have not created a document for a collection. If you will create document for a collection then the created database will be visible.

Where are MongoDB files stored?

By default MongoDB data files are stored in C:\ProgramData\FotoWare\FotoWeb\Operations\MongoDBData. Stop all FotoWare services on the server. Move the existing MongoDB data folder from C:\ProgramData\FotoWare\FotoWeb\Operations\MongoDBData to the new location where it should be stored.

What is MongoDB collection?

A collection is a grouping of MongoDB documents. Documents within a collection can have different fields. A collection is the equivalent of a table in a relational database system. A collection exists within a single database.

How many collections can a MongoDB have?

ns file, with an average of about 628 bytes per name, or about 24000 of the namespace for the entire database. Each collection and index will occupy a namespace. Therefore, if each collection has an index (such as the default _id index), you can create up to 12,000 collections.

What is DB collection?

A collection may store a number of documents. A collection is analogous to a table of an RDBMS. A collection may store documents those who are not same in structure. This is possible because MongoDB is a Schema-free database.

How does MongoDB store data?

Start Thinking in JSON

In MongoDB, data is stored as documents. These documents are stored in MongoDB in JSON (JavaScript Object Notation) format. JSON documents support embedded fields, so related data and lists of data can be stored with the document instead of an external table.