MongoDB

Over the past two years, our blog has elaborated on fragmented work clusters and build processes. In this blog, we mainly analyze test results in a fragmented cluster.First, take a look at each state of the fragmented cluster. As you can see,

Some time ago to understand ansible configuration management (http://blog.csdn.net/column/details/ansible.html anisble Configuration Tool box translation), I feel very strong, Think of the short term tornado and twisted it's a combination of what to

Mongodb Gridfs picture File storage SolutionBefore the solution is to receive image data, the image is stored directly to the disk array, and then through Apache server, the picture information stored in the database, and storage of an Apache access

Because there is no virtual machine at home on weekends, you complete the deployment requirements under Windows and write the bat run script. 1. Create configuration files and related directoriesThe total startup script is as follows

Starting and stopping the database is the most basic operation of the database, and it is also a precondition for the database to provide service and be connected to management. There are some differences in the way the database starts and stops,

Most of the time we need to serialize and deserialize the entity object, whereas the Objectid type can only be serialized using the MONGO driver in Bson format, but our external interactions are generally JSON format.There are two types of solutions:

Recently busy to transfer a project from MySQL to MongoDB, in the process of importing old data, encountered some twists and turns, made a lot of mistakes, but also learned a lot of knowledge, so recorded. The company specially equipped with

The situation reproduces that the website connected to MongoDB is not off and directly shuts down the MongoDB cmd window. The failure to open MongoDB again appears.Solution: Online said is to delete *.lock files, then--repair, and finally open

1:mongostatMongoDB2.6 versionMongoDB3.0 version2:db.setprofilinglevel (2): Open ProfilerMySQL-like slow logThe profiler is turned off by default, and you can choose to turn it all on, or when you have a slow query.Db.setprofilinglevel (level,) 0=off

The 1:local library is a system library of MongoDB that records information such as timestamps and indexes and replication sets.Gechongrepl:primary> use localswitched to DB localgechongrepl:primary> show Tablesmeoplog.rsreplset.minvalidslavesstartup_

This article turns from http://www.cnblogs.com/stephen-liu74/archive/2012/08/03/2553803.html1. Basic Enquiry:Constructs the query data.> Db.test.findOne (){"_id": ObjectId ("4fd58ecbb9ac507e96276f1a"),"Name": "Stephen","Age": 35,"Genda":

Installation Services Mongod--install--servicename mongodb--storageengine=mmapv1--dbpath i:\mongodb\data--journal--logpath i:\ Mongodb\log\log.txtInstallation Service error with secure authentication Mongod--install--servicename mongodb--port 27017--

The author uses the. NET driver recommended by MongoDB website:http://mongodb.github.io/mongo-csharp-driver/2.0/getting_started/quick_tour/For MongoDB installation readers can refer to other blogs, for basic learning does not require excessive

1. Basic Enquiry:Constructs the query data.> Db.test.findOne (){"_id": ObjectId ("4fd58ecbb9ac507e96276f1a"),"Name": "Stephen","Age": 35,"Genda": "Male","Email": "xxx@163.com"}--Multi-criteria query. The following example is equivalent to the where

Jdbc BASICS (5) connection pool and Data source: Use of DBCP and C3P0 I. Concepts and usage of Connection Pool In actual application development, especially in WEB application systems, If JSP, Servlet, or EJB uses JDBC to directly access data in

Database review 7 -- restoreDatabase review CH14 recovery 13.1 recovery concept Database SystemRestoreIt refers to the behavior that restores the database from an inconsistent state after a certain "failure" to a normal consistent state. The basis

Why does the database require ImplictCommit (implicit commit of transactions) First look at an SQL statement. What do you think is the output of the last SQL statement? SET AUTOCOMMIT = 1;BEGIN;INSERT INTO t1 VALUES (1);CREATE TABLE t2 (pk int

MongoDB query, index, and aggregationInitialize the mongodb Database > Use dengswitched to db deng> db. createCollection ("jingdong") # No parameter {"OK": 1}> show collectionsjingdongsystem. indexes> userdoc1 = ({"user_id": 1, "name": "cloud",

MongoDBCRUD operations (focusing on update operations) (1)I. Introduction MongoDB is a high-performance, open-source, and non-pattern document-based database. It is currently the most popular NoSQL database product. Data is stored in a data set by

Use Hive's regular parser RegexSerDe to analyze nginx logs 1. Environment: Hadoop-2.6.0 & apache-hive-1.2.0-bin 2. Use Hive to analyze nginx logs. The website access logs are as follows: Cat/home/hadoop/hivetestdata/nginx.txt 192.168.1.128--[09/Jan/2