MongoDB

CentOS-6.5 single-Machine implementation MongoDB ShardsEnvironment:1) CentOS 6.5 system 2) IP: Native 3) mongodb:mongodb-linux-x86_64-2.6.1implementation: two replica sets shard (Shard-a and Shard-b), each replica set shard configured three

The document formats stored in MongoDB are as follows, implementing queries Fromdata data for the specified values under did and Dvid{ "_id": { "$oid":"553f4a9facc494278f5ad1b0" }, "RID":"9eec7fbe8a6f4d17b02756fdbcefcc41", "Rname":"Test

Some basic statements about MongoDB data paging and sorting Limit,skip users, introducing MongoDB data paging and sorting instance methods.Use skip and limit to do data paging as follows:Code:Page1 = Db.things.find (). Limit (20)Page2 =

OverviewThe traditional relational database is usually composed of three hierarchical concepts of database, table, record, and MongoDB is made up of database, collection (collection), Three levels of document objects. MongoDB is for tables in

I. What is MongoDB     simply said mongodb is a kind of database, like our common mysql,sqlserver,orcale. But unlike these databases, they are relational databases, and mongodb is a non-relational database (NOSQL). mongodb is a high performance ,

A few days ago because of the project to use the MongoDB database, the exhaust in the official website to download a installation package, in fact, this installation package installation process is equivalent to the decompression process, but the

The following example shows a mapreduce example of mongoose, referring to the Mongoose official website.Basic concepts:map Functionaccepts a key-value pair (Key-value pair), which produces a set of intermediate key-value pairs. The MapReduce

Run the command window under Mongodb/binYou need to configure the log and DB path as follows:Mongod--logpath d:\mongo\logs\logfilename.log--logappend--dbpath d:\mongo\data--installThe MONGO DB service can be seen in the local service after

Create a file called mongod.cfg in MongoDB folder if you dont has it. In my Case:c:\users\ivanbtrujillo\mongodbThen, edit mongod.cfg with Notepad and add a line with the following (our custom DBPath):dbpath=C:\Users\ivanbtrujillo\MongoDB\data\dbIn

Download 32-bit mongodb:https://fastdl.mongodb.org/linux/mongodb-linux-i686-3.0.1.tgzDecompression: tar-zxvf/mongodb-linux-i686-3.0.1.tgzGo to the MongoDB directoryCreate two filesmkdir data//storage filemkdir logs//storing log filesStart MongoDB

Delete a collection in the shell, execute db.test.drop () or Db.runcommand ({"Drop": "Test"}), and the commands in MongoDB are actually implemented as a special type of query that executes against the $cmd collection, RunCommand simply accepts the

I see the state of the query here is 0, the previous data of the state is not 1, the solution is to repair the data.Db.repairdatabase ()As for the reasons for inconsistent data, I am not very clear, after a variety of information queryMay be in the

1. Install the downloaded MongoDB on the E-drive E:\MongoDB2. Go to the Bin directory to execute mongod--dbpath "E:\MongoDB\data" Enter, close the current CMD window3. Create a new Logs folder in the MongoDB directory to store the log files4. Create

Using System; Using System.Collections.Generic; Using System.Linq; Using MongoDB; Packaging classes for MONGO and Mongodatabase Public class Mymongodb:idisposable { private Mongo _mongo; private Imongodatabase _db;

AerospikeC client manual --- query-secondary index managementThe Aerospike C client provides the ability to create and delete secondary indexes in the database.Currently, secondary indexes can be created using a combination of namespace, set, and

The problem that the UUID cannot be returned when RACASMUDEV is installed on the VMUse UDEV service to solve the rac asm storage device name 1. confirm that the required UDEV package has been installed on all RAC nodes [root @ rh2 ~] # Rpm-qa | grep

Table space management, creation, and maintenance1 storage physical structure Datapage data page is the minimum storage structure of db2: 4 kb, 8 KB, 16 KB, 32 KB The minimum storage structure of the operating system is block: windows Minimum kb,

CRS-0184: Can not communicate with the CRSdaemon. node out-of-cluster troubleshooting 1. system environment: OEL6.5 Enterprise Edition Oracle11.2.0.2 RAC + ASM 2. error message: $ Crs_stat-tCRS-0184: Cannot communicate with the CRS daemon.$ Crsctl

Data Structure-linear table chain Storage StructureChain Storage Chain storage: stores data elements in a linear table with any group of storage units. Linear table stored in this method is short for Linear Linked List. Any group of storage units of

Two solutions for OGG Directorwebhang There are two solutions for OGG Director web hang: Description of Director web hang of OGG: It indicates that the web interface can be logged in, but the refresh date is a long time ago and does not change. One