MongoDB

Basic Operations Command:Show DBS: Display Database listShow Collections: Displays a collection in the current database (similar to a table in a relational database)Show Users: Show userUse : Switch the current database, which is the same as the

MongoDB log files in the case of setting logappend=true, will continue to the same log file appended, long time, naturally become very large.The solution is as follows: (Special note: The log path must be--logpath specified when booting)Use MONGO to

Problem Description: For example, there is a team table in the relational database, a user table, the two are many-to-many relationships, that is, a team can have multiple user, a user may belong to more than one team, how does such a relationship

Back to CatalogBulk INSERT in the EF era, the uncle has encapsulated itself, the principle is to reduce the number of SQL connections and the number of instructions sent to SQL to 1 times, or 1000 data 1 times, and for the statement generated by EF,

before today, after the installation of MongoDB, the start of the service this morning when the start of the failure, the following error:Error:Error 2: The system cannot find the specified fileThinking Process:Yesterday when the test, has installed

Mongodb sharding Shard cluster OS centos6.5192.168.3.100server1configport=27017192.168.3.100server1mongosport=27 018192.168.3.101node1mongodport=27018192.168.3.102node2mongodport=27018#CentOS安装mongo软件包yum-y Install MongoDB mongodb-server

On the left is the MONGODB query statement, and the right is the SQL statement. Compared with the use, very convenient.Db.users.find () SELECT * from UsersDb.users.find ({"Age": +}) SELECT * from the users where age = 27Db.users.find ({"username":

One: Insert operationThe previous article also said that the document is stored in the "k-v" format, if you are familiar with JSON, I believe that learning MongoDB is extremely easy, we know that the JSON valueIt could be "string", maybe "array",

Test>Use adminswitched to DB adminadmin>db.adduser ('yshy','yshy'){ "User":"yshy", "readOnly":false, "pwd":"2059c25b25df531ec5652d3eba0dc175", "_id": ObjectId ("5556a6da70d9c8c0f6a120ab")}admin>db.auth

For MongoDB, the View tool has MongoDB vue and so on, the individual is not very accustomed to use the view tool, so prefer to use MongoDB's own JavaScript shell. Not everyone's so-called Ascension B, just personal habits. Some of the content is

Deployment methodDeploy mongodb3.0.2 clusters on 3 centos6.6 systems in replica set mode.Official reference:http://docs.mongodb.org/manual/tutorial/deploy-replica-set/http://docs.mongodb.org/manual/tutorial/install-mongodb-on-red-hat/IP address

Back to CatalogSome things about the official drive integration IQueryable, there are good things and bad things, and the good thing is that it will translate your LINQ statements into MongoDB statements very friendly, and the bad thing is that some

After this blog:Http://www.cnblogs.com/xiaoit/p/4479066.htmlThe installation process is no longer described here.1: Introduction to ShardsThe Shard is a kind of database cluster system that expands the massive data horizontally, the data table is

Database Paradigm (normalformNF) 1. Currently, there are six paradigms: 1NF, 2NF, 3NF, BCNF (base-cod paradigm), 4NF, and 5NF (perfect paradigm ). 2. Various paradigms are progressive, backward compatible, that is, to meet the second paradigm,

Semi-sync settings of m-sMaster: Install the semi-sync plug-in (system@localhost) [(none)]> install plugin rpl_semi_sync_master soname 'semisync_master.so';Query OK, 0 rows affected (0.83 sec)(system@localhost) [(none)]> show plugins;+---------------

Report development instance-dynamic multi-level KPI drilling report (I) In report projects, there are sometimes dynamic hierarchical reports that require hierarchical drilling, making development more difficult. This document describes how to

Use Spark on MongoDB [Preface] Nosql technology only master MongoDB. I saw an article about how to use Spark on MongoDB, and quickly translated it to improve the core competitiveness. Original

Modify the default timeout value in phpmyadmin After logging on to the system, the system automatically exits after being inactive for 1440 seconds. You have to log on multiple times a day. Finally, you have time to solve this problem. It seems

AerospikeC client manual --- aggregation-record AggregationRecord aggregation can be used to process the secondary index query results. A common form of aggregation is to apply a function to the entire query result set.Many developers are familiar

Data Structure-tree and binary treeMain contents of the tree Tree Structure: a non-linear structure defined by the branch relationship. Main Content: Concepts of trees and Binary Trees, properties of binary tree storage of Binary Trees, traversal of