Understanding of mongodb

mongodb The understanding of

Mongodb Is a product between relational and non-relational databases (Nosal), Right and wrong relational database Can be the most abundant , Most like a relational database , The grammar is a little bit similar javascript Object oriented query language , It's a face To set , Schema free document database .
database mongodb explain

table collection Database table / aggregate

row document Data record row / file

column field Data field / Domain

index index Indexes

table joins Table joins ,MongoDB I won't support it

primary key primary key Primary key ,MongoDB Automatically put _id Field sets the primary key

redis Yes 16 Databases ,mongodb Build as many libraries as you want

•1.2、 Range of application ．

advantage ： High performance 、 Easy to deploy 、 Easy to use 、 It's very convenient to store data , Can be permanently stored
shortcoming ： Join table query is not supported , I won't support it sal sentence , Transaction stored procedures, etc. are not supported , So it is not suitable for storing numbers According to the data with complex relationship .
Apply to ： Log system , Stock data, etc .
Not suitable for ： E-commerce systems need the function of multi table query .