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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:
Relational Database
| MongoDB
|
Database
| Database
|
Table
| Collection
|
Row
| Document
|
Column
| Field
|
Comparisons between the Mysql and MongoDB:
| Mysql | MongoDB
|
Written in
| C++, C
| C++, C , javascript
|
Type
| RDBMS
| Document oriented
|
Main points
| Table, row, column
| Collection, document, field
|
Features
| Full text searching and indexing Integrated replication support Triggers Sub selects Query caching SSL support Different storage engines with various performance characteristics
| Auto sharding Native replacation 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 Unstable schema Your DB is set to grow big Data is location based High available in unstable environment is required No database administrators
|
Pros
| Atomic transactions support JOIN support Mature solution Privilege and password security system
| Document validation Integrated storage engines Shortened time between primary failure and recovery
|
Cons
| Tough scaling Stability concern Is not community driven development
| Not the best option for apps with complex transactions Not a snap in replacement for legacy solutions Young solution
|
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