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What is MongoDB?
- Scalable high performance open source, document oriented database.
- MongoDB is an open source document database written in C++.
- Document oriented
- Stores JSON like documents
- Includes a strong query language
MongoDB in a nutshell:
- Document oriented storage
- JSON style documents with dynamic schemas offer simplecity and power
- Full index support index on any attribute, just like you are used to.
- Rich, document based query language
- Flexible aggregation and data processing
MongoDB connector for Apache Spark:
- Native scala connector, sertified by databricks
- Exposes all spark APIs and libraries
- Efficient data filtering with predicate pushdown, secondary indexes and in database aggregations
- Locality awareness to reduce data movement
RDBMS and MongoDB differ:
Comparisons between the Mysql and MongoDB:
|Main points||Table, row, column||Collection, document, field|
Full text searching and indexing
Integrated replication support
Different storage engines with various performance characteristics
In memory speed
Embedded data models support
Comprehensive secondary indexes
Riche query language support
Various storage engines support
|Best used for|
Data structure fits for tables and rows
Strong dependence on multi row transactions
Relatively small datasets
High write loads
Your DB is set to grow big
Data is location based
High available in unstable environment is required
No database administrators
Atomic transactions support
Privilege and password security system
Integrated storage engines
Shortened time between primary failure and recovery
Is not community driven development
Not the best option for apps with complex transactions
Not a snap in replacement for legacy solutions