mongodb 3 0

3.Ubuntu Installing MongoDB Enterprise Edition① importing the public key by installing the package management systemsudo apt-key adv--keyserver hkp://keyserver.ubuntu.com:80--recv 0c49f3730359a14518585931bc711f9ba15703c6② Creating a/etc/apt/sources.list.d/mongodb-enterprise.list file Ubuntu 12.04 echo "Deb [ARCH=AMD64] http://repo.mongodb.com/apt/ub

, add Shard server (allowlocal allows multiple shards to be deployed on-premises, not allowed by default) Use admin db.runcommand ({addshard: "192.168.24.42:27017", allowlocal:true}) Db.runcommand ({addshard: " 192.168.24.252:27017 ", allowlocal:true}) //Log on to the MONGOs server, turn on the database sharding feature, and specify the Shard key of the collection Db.runcommand ({ Enablesharding: "DBName"}) Db.runcommand ({shardcollection: "Dbname.cname", Key:{fieldname:1}})

, "firstRecord" : "4:20b0", "lastRecord" : "4:7bec3b0" } ], "datasize" : 614217440, "nrecords" : 305603, "lastExtentSize" : 234311680, "padding" : 1.0000000000221079, "firstExtentDetails" : { "loc" : "1:1036000", "xnext" : "1:104e000", "xprev" : "null", "nsdiag" : "ttlsa_com.posts", "size" : 61440, "firstR

Tags: ISP roo operation command SRC Database administration authorization min backup restore1. First download the MongoDB installation package on the Internet, I use the 3.2 version on this side; 2. Install the MongoDB Setup program, set the environment variables after installation, the installation path of my side is: "C:\Program files\mongodb\server\3.2\bin",

MongoDB does not require a password after the default installation. At this point you show DBS will see that there is only one local database, the so-called admin does not exist. MongoDB has no root, only the user who can manage the user useradminanydatabase. ### #1. Set the authentication Mode # Here the default authentication mechanism for MONGO3 is changed to Scram-sha-1, and spring-boot until 1.3.0 RC s

:{$all: [1994,2008,2009]}},{"Cast": 0})System returns(There is no document that satisfies 3 conditions at the same time, returns null)Db.media.find ({$or: [{"Title": "Toy Story 3"},{"ISBN": "978-1-4842-1183-0"}]})System returns{"_id": ObjectId ("5aa490f053350e04ddbd6fa6"), "Type": "Book", "Title": "Definitive Guide to

Label:Original: 6 Rules of Thumb for MongoDB Schema Design:part 3 By William Zola, leads Technical support Engineer at MongoDB This article is the last article in the series. In the first article, I introduced three basic scenarios for modeling "one-to-many" relationships. In the second article, I covered the expansion of the underlying scenario: bidirectional co

use another keyword called the $match,where condition meaning ...1 Db.product.aggregate ([2 {3 $lookup:4 {5 from:"orders",6Localfield:"_id",7Foreignfield:"PID",8 as:"Inventory_docs"9 }Ten }, One{$match: {price: {$gt: -} } } A])As expected, we filtered out the "merchandise 1" because it was less than 20, right, but it doesn't look perfect, so I just need orders information and I don't wantThe so-called prod

Label:Because the project to use MongoDB, today tried to build a bit. First MONGO is still very good, yum or manual download, I am the most recent version of Yum installed 3.0.4. Basically, after the installation is complete, a GUI management tool needs to be installed, and I have tried a lot, all the same. Finally, choose to use Robomongo because this GUI tool has versions on Linux, MAC, and Windows. I install it on CentOS and then modify the/etc/mon

parameter needs to be turned on. root@zhoujinyi:/usr/local/mongo4# MONGO--port=27020 MongoDB shell version:3.0.4 connecting To:127.0.0.1:27020/test Gt Show DBS;# # # #没有验证, cause no permissions. 2015-06-29t10:02:16.634-0400 E QUERY error:listdatabases failed:{"OK": 0, "errmsg": "Not authorized on ADMI N to execute command {listdatabases:1.0} ', ' Code ': ' At Error ' (#验证, because the account added under

: Target Record filteringSort: Target record sortingLimit: Limits the number of target recordsOut: The statistics result holds the collection (does not specify the use of temporary collection, after the client disconnects automatically delete)Keeptemp: Whether to keep temporary collectionsFinalize: Final processing function (save the result set after the final collation of the reduce return result)Scope: Import external variables to map, reduce, finalizeVerbose: Displays detailed time statistics

Recently installed mongodb3.1.4, and enabled authorization authentication, in DOS window operation without any problems, in order to maintain the convenience of downloading a client tool Robomongo 0.8.5, user name, password, such as configuration good solution test, the result of connection service is not a problem, permission verification did not pass , check the log, found a sentence: Failed to authenticate [e-mail protected] with mechanism mongodb-

MongoDB (3)-add, delete, modify, and query operations MongoDB, as a non-relational database, is very different from the addition, deletion, modification, and query of traditional databases. Here we only outline the knowledge points. In actual use, we can use Baidu for details. Let's take a look at several major aspects: I. There are relatively few knowledge po

connection, and the single line is A virtual connection.Note: The chain synchronization structure of MongoDB is similar to the streaming replication of data blocks in HDFS in Hadoop. This can greatly reduce the pressure on the master node and improve the speed of data synchronization.3. New Functions The above is the internal implementation of current Replica Sets synchronization, and some new features wil

Label:Indexes can be used to optimize queries, and in some specific types of queries, indexes are essential. Choosing the right index for a collection is the key to improving performance. First, mock data. for (i = 0; i ) { Db.users.insert ({ "i": I, "username": "user" + I, "Age": Math.floor (Math.random () *), new Date () }); 1 million data will be created in the database, a little bit slower, and will

Recently installed mongodb3.1.4, and enabled authorization authentication, in DOS window operation without any problems, in order to maintain the convenience of downloading a client tool Robomongo 0.8.5, user name, password, such as configuration good solution test, the result of connection service is not a problem, permission verification did not pass , as shown in the log, found a sentence: Failed to authenticate admin@admin with mechanism mongodb-c

found in the specified database to create, delete and manage user Clusteradmin: Only available in the Admin database, give the user all the Shard and replica set related functions of administrative rights. readanydatabase: Only available in the Admin database, giving the user read access to all databases readwriteanydatabase: Only available in the Admin database, giving users read and write access to all databases Useradminanydatabase: Only available in the Admin database, giving the user usera

Tags: go import final rom linkage host int div use preLinkage of Class 3 databases: MySQL, MongoDB, RedisFrom pymysql import *from pymongo import *from redis import *class MySQL (object): Def __init__ (self): Self.con = Connect (host= ' localhost ', port=3306, database= ' stu_info ', user= ' root ', password= ' MySQL ', charset= ' utf8 ') self.cur = Self.con.cursor () Self.flag = [

MongoDB, as a non-relational database, is very different from the addition, deletion, modification, and query of traditional databases. Here we only outline the knowledge points. In actual use, we can use Baidu for details. First, let's look at several major aspects: 1. There are not too many details about the insertion and deletion in it, but there are relatively few knowledge points. Let's take a look at the updates,

do not return results by default: This saves the client time to wait for a round-trip between the client and server during write operations. If someone needs a returned result, he can always call getlasterror. If you write data for MongoDB on multiple connections, it is important to call getlasterror on a connection to confirm that the data has been submitted to the database. For example, if you write data to connection #1 and want these writes to be