System identifies when a rollback needs to occur Users are responsible for

System identifies when a rollback needs to occur

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System identifies when a rollback needs to occur Users are responsible for manually applying roll back changes Provides Memory Mapped Files - A memory-mapped file is a segment of virtual memory which has been assigned a direct byte for byte correlation with some portion of a file or file-lie resource - mmap() Other additional information - supports geospatial data of type o spherical provides longitude and latitude o Flat 2 dimensional points on a plane o Geospatial indexes Document in MongoDB - A document is a set of key-value pairs - Document have dynamic schema - Dynamic schema means that documents in the same collection do not have the same set of fields or structure and common fields un a collections documents may hold different types of data
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MongoDB collection - A collection is a group of MONGODB documents - It is the equivalent of an RDBMS table - It exists within a single database - Collection does not enforce schema - Documents within a collection can have different fields - Usually all documents in a collection are of similar or related purpose Collection - Cryptography means refers to the study of mathematical techniques to achieve data security & secure communication - Very important to protect data in transit o Communication channels and IP protocol are insecure - Cryptography is a major technique behind information & network security and a means to achieve o Authentication o Data integrity o Confidentiality o Digital signature o Privacy MongoDB data modelling - Data in mongoDB has a flexible schema.documents in the same collection - They do not need to have the same set of fields or structure - And common fields in a collections documents may hold different types of data
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Designing schema - Design your schema according to user requirements - Combine objects into one document if you will use them together - Otherwise separate them (but make sure there should not be need of joins) - Duplicate data (but limited) because disk space is cheap as compare to compute time - Do joins while write not on read - Optimize your schema for most frequent use cases - Do complex aggregation in the schema Summary - Design your schema according to user requirements - Combine objects into one document if you will use them together - Otherwise separate them (but make sure there should not be need of joins) - Duplicate the data (but limited) because disk space is cheap as compare to compute time - Do joins while write not on read - Optimize your schema for most frequent use cases - Do complex aggregation in the schema
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