MongoDB

Windows installation:Install the default version directly on the official website (then install it one click). After installation, go to the installation directory to create a new data folder (the folder where MongoDB data is saved).

In the start Mongod error, there is a place because the/data/db permissions is wrong, because to create the directory requires root permission, after the creation of a chown xxx/data to change the directory to the current user, or start will error,

In this blog the procedure of MongoDB would be is described in details. It is known that MongoDB have provided a series of efficient solution to some different questions, such as high performance , changeable type and so on. Compared with the MySQL

This can be written in the MongoDB query statement {"A": $gt (1), "a": $lt (5)}But the value of this query will be matched by a single condition, and the end result is a collection of more than 1 +a less than 5.If you need to implement the

1. Download MongoDBThe default is 64-bit, this is a bit awkward ...64-bit system: https://www.mongodb.org/dl/linux/x86_64-debian81?_ga=2.15324022.1713724367.1498550277-1089294971.149855027732-bit Download list address:

1: InstallationDownload the latest version from Https://www.mongodb.com/download-center?jmp=nav#community to local, and modify the installation path C:\MongoDB when installing.After installation, there will be C:\MongoDB\bin directory, there are

MONGO the storage of data is very arbitrary, it becomes more complex when you need to modify an array object in an object.Class objects in a class can be passed directly through the "." Example: Department.User.nameThe object in the class is an

MongoDB's replica set mode has been greatly improved by the earlier Master-slave mode, since the previous Master-slave mode does not support the host outage after switching to the slave, has gradually been eliminated. And now the official

I. Data insertion and deletion650) this.width=650; "src=" Https://s3.51cto.com/wyfs02/M00/99/B0/wKioL1lLRY-yfmE4AAB8EMf1VI8268.jpg "title=" 36020170622121223825.jpg "alt=" Wkiol1llry-yfme4aab8emf1vi8268.jpg "/>(1) Insert function: DB. set name.

-j plus your CPU cores to speed up the compilation processCompile errors You can install the required dependencies yourself.Or go to the official website directly download the compiled binary, directly execute.After compiling, view the

One, MongoDB data query(1) MongoDB uses the Find function to query data, with the same functionality as the Select function in SQL, which can provide many functions similar to the relational database, including mapping, sorting, and so on.Db.

Download work:wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel62-3.4.5.tgzUnzip the downloaded file to the specified directoryTar XF mongodb-linux-x86_64-rhel62-3.4.5.tgz-c/usr/MV mongodb-linux-x86_64-rhel62-3.4.5 MONGOCreate data

　　The concept of a replica setWhat is a copy? Perhaps the first impression is a copy of the game, the game copy is to let each player have a separate game environment, the replication of this environment is a copy of the embodiment. MongoDB also

　　First, MongoDB fixed set concept　　　　A fixed set refers to a set that is created beforehand and fixed in size. That is, if a collection is set to a fixed size of 100, and then a document is added, the first document will be removed, leaving only 100

　　First, the importance of MongoDB security checkThe database in each MongoDB instance can have many users. If the security check is not enabled and the user is restricted, each user who enters the database can read, write, or even write to the

This morning to find information, found MongoDB, free to study the next, I use the Phpstudy integration package to add MongoDB extension.1. Add MONGO, MongoDB extensionPhpstudy integrated environment is generally 32-bit PHP, go to the official

Installing MongoDBStart Database: Installation Complete Specify database storage path Mongod.exe--dbpath c:\data\dbRun Mongo.exe successfully after entering directoryCreate a database> Use mydbswitched to db mydb> dbmydb> book = {"title":"From

　　First, the concept of the indexI believe that everyone is not unfamiliar with the index, the index of the database is similar to the directory index of the book, there is an index, reading when you do not have to go through the whole book, you can

[Email protected] mongodb]# bin/mongod-f CONFIG/MONGO.CNF &[1] 30549[[email protected] mongodb]# 2017-06-09t07:13:09.423+0000 F CONTROL [main] Failed global Initialization:BadValue:Invali D or no user locale set.Please ensure LANG and/or lc_*

Fixed CollectionThe MongoDB fixed set (Capped collections) is a well-performing and fixed-size set, and for a fixed size we can imagine it to be like a ring queue , and when the set space is exhausted, the inserted element will overwrite The most