bài thảo luận ý nghĩa của no sql khái niệm tổng quan NoSQL

ý nghĩa của no sql khái niệm tổng quan, ý nghĩa của no sql khái niệm tổng quan, ý nghĩa của no sql khái niệm tổng quan, ý nghĩa của no sql khái niệm tổng quan, ý nghĩa của no sql khái niệm tổng quan

1 What is NoSQL ?  Defination  Stand for “NOT ONLY SQL”  Non-relational database  A flexible database used for big data & real-time web apps  Multiple types of NoSQL databases  NoSQL characteristics:  No Predefined Schemas  May insert data without creating tables, columns  Rarely Foreign Keys  No JOIN operations  Relationships are not automatically maintained  Eventual Consistency  Old copies being replaced by new records  Inconsistent data until all replacements are complete  NoSQL vs SQL: https://www.edureka.co/blog/sql-vs-nosql-db/ Example of SQL & NoSQL: Advantages of NoSQL  Flexible data models NoSQL databases more relaxed in structure of data: - Database schema changes not have to managed as one complicated change unit - Application already written to address an amorphous schema  Economics: clusters of cheap commodity servers to manage the data and transaction volumes  Horizontal scaling: most NoSQL databases allow to scale-out horizontally, meaning we can add cheaper, commodity servers whenever we need to  Fast queries: data in NoSQL databases is typically stored in a way that is optimized for queries Queries typically not require joins, so the queries are very fast  Easy for developers: NoSQL require less management, automatic repair and simple data models Disadvantages of NoSQL  NoSQL databases don’t have the reliability functions which Relational Databases have (basically don’t support ACID)  This also means that NoSQL databases offer consistency in performance and scalability  In order to support ACID developers will have to implement their own code, making their systems more complex  This may reduce the number of safe applications that commit transactions, for example bank systems  NoSQL is not compatible (at all) with SQL  Note: Some NoSQL management systems use a Structured Query Language  This means that you will need a manual query language, making things slower and more complex  NoSQL are very new compared to Relational Databases, which means that are far less stable and may have a lot less functionalities  ...Example of SQL & NoSQL: Advantages of NoSQL  Flexible data models NoSQL databases more relaxed in structure of data: - Database schema changes not have to managed as one complicated... models Disadvantages of NoSQL  NoSQL databases don’t have the reliability functions which Relational Databases have (basically don’t support ACID)  This also means that NoSQL databases offer consistency... safe applications that commit transactions, for example bank systems  NoSQL is not compatible (at all) with SQL  Note: Some NoSQL management systems use a Structured Query Language  This means