- How many text indexes can there be on a MongoDB collection?
- How many collections can be created in MongoDB?
- Is MongoDB good for large data?
- Can I run MongoDB locally?
- How do I limit in MongoDB?
- Which command in MongoDB is equivalent to SQL select?
- What is the maximum size of collection in MongoDB?
- Is MongoDB better than SQL?
- Which is the method used in MongoDB to grant user?
- Which field is required of all MongoDB documents?
- Is MongoDB dead?
- How do I merge two MongoDB collections?
- Is MongoDB free to use?
- How many connections MongoDB can handle?
- Which is the index used for multiple fields?
- Why is MongoDB bad?
- Which database is best for large data?
- What is sharding in MongoDB?
How many text indexes can there be on a MongoDB collection?
A collection can only have one text search index, but that index can cover multiple fields..
How many collections can be created in MongoDB?
It does say on the limits page that 24000 is the limit ( http://docs.mongodb.org/manual/reference/limits/#Number%20of%20Namespaces ), as though there is no way to expand that but there is.
Is MongoDB good for large data?
Because of its features, MongoDB is The database for Big Data processing. MongoDB, the open-source NoSQL database, was recently named “Database Management System of the Year” by DB-Engines with a good reason, as NoSQL databases are generally better-suited for processing Big Data than RDBMS.
Can I run MongoDB locally?
To connect to your local MongoDB, you set Hostname to localhost and Port to 27017 . These values are the default for all local MongoDB connections (unless you changed them). … This is how you can use MongoDB Compass to connect to a MongoDB that’s running on your own computer.
How do I limit in MongoDB?
The Limit() Method To limit the records in MongoDB, you need to use limit() method. The method accepts one number type argument, which is the number of documents that you want to be displayed.
Which command in MongoDB is equivalent to SQL select?
With NoSQLBooster for MongoDB, you can run SQL SELECT Query against MongoDB. SQL support includes functions, expressions, aggregation for collections with nested objects and arrays. See the features and SQL examples supported by the NoSQLBooster for MongoDB.
What is the maximum size of collection in MongoDB?
Sharding Operational RestrictionsAverage Size of Shard Key Values512 bytes64 bytesMaximum Number of Splits32,768262,144Max Collection Size (64 MB Chunk Size)1 TB8 TBMax Collection Size (128 MB Chunk Size)2 TB16 TBMax Collection Size (256 MB Chunk Size)4 TB32 TB
Is MongoDB better than SQL?
MongoDB is almost 100 times faster than traditional database system like RDBMS, which is slower in comparison with the NoSQL databases. … MongoDB supports deep query-ability i.e we can perform dynamic queries on documents using the document-based query language that’s nearly as powerful as SQL.
Which is the method used in MongoDB to grant user?
To add a user, MongoDB provides the db. createUser() method. When adding a user, you can assign roles to the user in order to grant privileges. The first user created in the database should be a user administrator who has the privileges to manage other users.
Which field is required of all MongoDB documents?
MongoDB stores data records as BSON documents….The _id FieldBy default, MongoDB creates a unique index on the _id field during the creation of a collection.The _id field is always the first field in the documents. … The _id field may contain values of any BSON data type, other than an array.
Is MongoDB dead?
MongoDB is still a very young platform to judge to life or death . NoSQL databases have emerged in recent years to provide the performance, scalability, and flexibility required of modern applications. … NoSQL databases scale out on low cost, commodity hardware, allowing for almost unlimited growth.
How do I merge two MongoDB collections?
Join Collections MongoDB is not a relational database, but you can perform a left outer join by using the $lookup stage. The $lookup stage lets you specify which collection you want to join with the current collection, and which fields that should match.
Is MongoDB free to use?
Yes, MongoDB is licensed under Free Software Foundation’s GNU AGPL v3. 0. Practically, this means that enhancements you make to MongoDB must be released to the community. … However, in the specific case of MongoDB, they simply recognize that applications using their database are a separate work.
How many connections MongoDB can handle?
Connection Limits and Cluster TierCluster TierMaximum Number of Concurrent Incoming ConnectionsM40 / M40 Low CPU *6000M50 / M50 Low CPU *16000M60 / M60 Low CPU *32000M80 Low CPU *6400010 more rows
Which is the index used for multiple fields?
multicolumn indexThe two types of indexes are single-column indexes and multicolumn indexes. A single-column index is an index based on the values in one column of a table. A multicolumn index is an index based on the values in multiple columns of a table.
Why is MongoDB bad?
MongoDB, unfortunately, does not support transactions. So if you need to update more than one document or collection per user request, don’t use MongoDB. It may lead to corrupted data, as there is no ACID guarantee. Rollbacks have to be handled by your application.
Which database is best for large data?
TOP 10 Open Source Big Data DatabasesCassandra. Originally developed by Facebook, this NoSQL database is now managed by the Apache Foundation. … HBase. Another Apache project, HBase is the non-relational data store for Hadoop. … MongoDB. MongoDB was designed to support humongous databases. … Neo4j. … CouchDB. … OrientDB. … Terrstore. … FlockDB.More items…
What is sharding in MongoDB?
Sharding is a method for distributing data across multiple machines. MongoDB uses sharding to support deployments with very large data sets and high throughput operations. Database systems with large data sets or high throughput applications can challenge the capacity of a single server.