MongoDB

Upgrading MongoDB to 2.6Prepare for upgrade1. Connect the 2.6 MONGO shell to the 2.4 replica set secondary member and execute Db.upgradecheckalldbs () in the admin library.2. Evaluate application compatibility issues for upgrade to 2.6, refer to:

For the MongoDB package is still continuing, for the continuous pursuit of simple programming continues, for like the Code of the feeling, still continue ...When your MONGO data table has sub-objects, especially the list objects, the use of the

Currently, MongoDB uses a memory-mapped storage engine, it will convert the disk IO operation into memory operations, if it is read operation, in-memory data play a role in the cache, if it is a write operation, memory can also convert random write

Overview-Machines Three MONGO data node machines (default port 27107, where a machine is stored for multiple copies, hence the new port): 10.13.2.51: 10001/10002/10003 10.13.2.52: 10001/10002/10003 10.13.2.151: 10001/10002/10003 A MONGOs machine: 10.

The last few blogs simply introduced MongoDB and how to install it, and how to operate MongoDB under DOS and what errors occurred in the installation of MongoDB, how to solve it. Of course, these are not enough, we have to use the actual. I did a

Sharding (sharding) is the method of storing data through multiple servers. MongoDB uses shards to support the deployment of very large datasets and high throughput operations. The ability of a single server is limited in all aspects, such as CPU,

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":

1.Windows installation of MongoDBHttp://www.mongodb.org/downloads download MSI, next step ...After installation, to the installation directory of the bin directory execution Mongod start the database service, if not up, error "E:\data\db not found",

Code Listing 1:

MongoDB DownloadMongoDB provides precompiled binary packages for 32-bit and 64-bit systems that you can download from the MongoDB official website, MongoDB precompiled binary package:Http://www.mongodb.org/downloads ExtractAfter downloading

Adding user authentication information to the Spring MONGODB configuration For project construction of Spring MongoDB, please refer to: http://blog.csdn.net/h348592532/article/details/39344823. In the linked article in detail, such as

Preparatory workEnvironment: CentOS6.5 64-bitMongoDB 3.0.1 64-bitFirst, start the Mongod service[Email protected] data]#/usr/local/mongodb3.0.1/bin/mongod--port 40144--dbpath=/data/mongodb3.0.1/data/--logpath

MongoDB useAfter installing MongoDB, and starting MongoDB, basic operation:Show DBS; Display database show collections; Displays the collection in the current database, similar to the table in MySQL database show users; Show user use switch the

1. Create a Mongodb-org-3.0.repo file[Email protected] local]# Vi/etc/yum.repos.d/mongodb-org-3.0.repo2, add the following in the Mongodb-org-3.0.repo file[Mongodb-org-3.0]name=mongodb repositorybaseurl=http://repo.mongodb.org/yum/redhat/$releasever/

1. 下载安装文件，解压tar zxvf mongodb-linux-x86_64-2.6.8.gz2. 移动到/opt目录 mv mongodb-linux-x86_64-2.6.8/bin /opt/mongodb　　bin目录说明：　　　　mongo 客户端程序，连接MongoDB mongod 服务端程序，启动MongoDB mongodump 备份程序 mongoexport 数据导出程序

Showtablestatuslike & #39; table & #39; \ G detailsMysql> show table status like 'leyangjun' \ G* *************************** 1. row ***************************Name: leyangjun table NameEngine: MyISAM Table Storage EngineVersion: Version

Locale: facet: _ S_create_c_localenamenotvalid Solution Among many shell scripts, we often see the previous sentence "LC_ALL = C" SAR_CMD = "LC_ALL = C sar-u-B 1 5 | grep-I average" in front of a command. meaning? LC_ALL = C is used to remove all

Recreate the password fileDue to the simulated exercise machine, the password file was accidentally deleted, so it had to be rebuilt:SQL> exitFrom Oracle Database 11g Enterprise Edition Release 11.2.0.1.0-ProductionWith the Partitioning, OLAP, Data

Data cleansing Note: determines whether it is a digital Function Background] When data is being processed, a large number of Chinese characters or meaningless English characters appear when inserting data into a field of the number type. Check

Data Distribution in the Aerospike-Architecture SeriesData Distribution (Data Distribution) The Aerospike database isShared-NothingArchitecture: each node in an Aerospike cluster is the same. All nodes are equal and have no spof. Using the Aerospike