MongoDB

MONGODB2.6 's rights management and 2.4 are very different, the Internet can see the basic articles are based on 2.4 below, many do not apply. After some groping finally straightened out 2.6 of the rights management, take notes.The version I'm using

The principle of gridfs is to divide large files into larger chunks and store each block as a separate document.(1) The blocks in the Gridfs are stored in a dedicated set, the default is fs.chunks;(2) In addition to storing each block of a file

First, explain functionThe explain function can provide a large number of query-related information, and if it is a slow query, it is the most important diagnostic tool. For example:Query on fields that have an index:> db.post.find ({"loc.city": "NY"

MONGO installation processMONGO installation method There are tens of thousands of kinds, only one let me feel good, said the installation process of a little heart de.Method One: Source installation, do not use this method, Nick I used the virtual

MongoDB allows deep-inside documents to index nested fields and arrays; nested objects and array fields can be used with top-level fields in a composite index, in most cases consistent with the behavior of the "normal" indexed fields.I. Indexing

MongoDB in Find query using Perl-compatible regular expressionsPerl Express Description: Http://www.chinaunix.net/old_jh/25/159388.htmlExample:> db.post.find ()    {  "_id"  : objectid ("54a530c3ff0df3732bac1681"),  "id"  : 2,  "name"  :  "Joe", 

DocumentThe document is the basic data structure in MongoDB, such as: {"name": "Jack", "LastName": "XI"} key-value pairs are ordered , and {"LastName": "XI", "name": "Jack"} is different. Each document has a special key _id, which is unique . The

MongoDB Replica Set is the officially recommended master-slave replication and high availability scheme for MONGODB, which replaces the original Master-slave master-slave replication scheme. The REPLICAT set has automatic switching, and when primary

Is really a sad story, is that you solve the problem did not remember, but need to search through searching engine again, fortunately, once you have done a record, search to help you find.This is my WordPress blog collation Records, a long time no

1 , check if there is Yum SourceYum Info Mongo-10gen2 , add Yum SourceVi/etc/yum.repos.d/mongodb.repo Enter the following content:[MongoDB]Name=mongodbrepositorybaseurl=http://downloads-distro.mongodb.org/repo/redhat/os/x86_64/Gpgcheck=0Enabled=13 ,

# # #安装1. Install (Windows): Unzip to install directory C:\mongodb, create folder C:\mongodb\data\db, C:\mongodb\data\log, create file c:\mongodb\data\log\ MongoDB.log2. Start-Up service: CD C:\mongodb\bin; Mongod-dbpath "C:\mongodb\data\db"3. Test

Search front five files, due to MongoDB redhat foreign mirror access very slow, download and install the SuSE version and install:mongodb-org-2.6.6-1.i686.rpmmongodb-org-mongos-2.6.6-1.i686.rpmmongodb-org-server-2.6.6-1.i686.rpmmongodb-org-shell-2.6.

In addition to the basic query functionality, MONGODB also has powerful aggregation tools, including: count (), distinct (), group (), MapReduce.counting function countCount is the simplest aggregation tool that returns the number of

1. PurposeThe question is so simple that I think I should write an article for a long time, but for starters, anything that hasn't been touched is likely to be a stumbling block, so this blog is designed to keep track of the road, not the level.2.

A scalar (non-array element) in the document must match each statement in the query condition. For example, if you use {"X": {"$GT": Ten, "$lt": 20} The query will only match documents with the value of "X" key greater than or equal to 10 and less

MongoDB has successfully started in the previous post: http://blog.csdn.net/u010773667/article/details/41847487, it's time to do a series of operations. We open a cmd, enter the "MONGO" command to open the shell is MongoDB client, the default

The "former record" has recently been modified by the company system, borrowing the memory library to achieve rapid response. The company borrows the MongoDB database. Here is the note to learn to organizeFrom Start & Close, it's too easy to install.

Insert: Number of inserts in one secondQuery: Number of queries in one secondUpdate: Number of updates in one secondDelete: Number of deletions in one secondGetmore: Getmore operation of cursor at query timeCommand: Number of commands executed in

First, the use of wget download MongoDB official website installation files.     wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-2.6.5.tgz Second, decompression, installation, configuration TAR-XVF mongodb-linux-x86_64-2.6.5.tgz #解压mv

Several suggestions and Explain optimization analysis for index creation when using NOSQL MongoDBFirst, the MongoDB index is very similar to the MySQL index, and many MySQL index optimization methods are also applicable to MongoDB.Second, more