MongoDB

Previously designed a label system based on Lucene, in the case of a small amount of data and the amount of concurrency can be used reluctantly, more than 1 million of the query will be more than 1 seconds, ranking is affecting a lot of performance,

The admin library is created automatically when the--auth parameter is added to the installation, but if there is no user in the library, the default is not required to verify that you can log on directly Use the following steps to create an

requirements, MySQL table, a log table, the average record of statistical data cycle, in practice to learn, with MySQL may be more trouble, then use just contact with the MongoDB bar, but also with the study of Hadoop last year stained point, and

MongoDB Common Operations First, we start MongoDB: [Root@h3/]# mongod-f/etc/mongod.conf Wed June 23:38:58.195 Wed June 23:38:58.195 warning:32-bit do N ' t have journaling enabled by default. Please use the--journal if you want durability. Wed June

To select a database, use: dbname; ? > This database does not need to be built ahead of time and is automatically created when you use it. It should be noted that a new database may have been accidentally created, creating a strange error.

The prerequisite for running the following program is that the MONGO extension is installedClass Mongodbclass{Private $_mongo = null;Public function __construct ($hostname, $hostport){if (empty ($username)) {$DSN = "mongodb://{$hostname}:{$hostport}"

MongoDB Configuration and PHP connectivity test(2010-05-10 10:41:36) reprint Tags: mongodb php topics Category: Technical Articles The auto-sharding function of MongoDB refers to the mongodb of a horizontally expanding

First need to install Pymongo module, module download address https://pypi.python.org/pypi/pymongo/#downloads Select the appropriate version, to install, after the installation is completed, you can link your mongodb. pymongodb-2.3.tar.gz Download:

Lead: db.keyword.distinct ("keyword"). length As follows: Db.keyword.distinct ("keyword"). length View the total number of records in the keyword table that do not duplicate keyword fields This method is not seen in the official document, try to

Some time ago accidentally closed MongoDB, ready to restart but found no, error message is as follows:   Tue Apr 11:13:30  www.2cto.com   Tue Apr 11:13:30 War Ning:32-bit servers don ' t has journaling enabled by default. Please use the--journal if

To define a function: Db.system.js.insert ({ _id: "Testconcat", value:function testconcat (S1, S2) { return s1 + s2 } }); To run the function: Db.eval (' Testconcat ("abc", "123"); Results: abc1

Recently has been thinking about the architecture of things, there is a problem still bothering us to do business systems, that is, log and log statistics. The general question is as follows: We have a lot of modules, although the log format is

With yesterday's smooth, today is more confident, today to do is to obtain the number of interval records, for the foreground statistics chart preparation data, for example, the effect is, In 1 days, there are xx times, within 2 days of XX times,

The final processing results are stored in the "ttt_date_out" table and the next mapreduce is written, and the expected result is the average record generation time Map for all records: function Map () { var count_time = 0; var arv_time = 0; var

OK, continue to complete the second demand, to find the number of records in a day statistics, directly run the "Combat 4" prepared MapReduce, the exception is not a number Nan, through the analysis of the results, found the reason, the reason

Recently has been looking at MongoDB book, but the practice is not much, today at noon using the rest, the virtual machine was installed, operating system for cent OS 6.2 (64-bit). The following records are as follows; 1 Download the installation

An example of modeling a customer and its multiple address relationships Use normalized ( referenced ) and non-normalized ( inline ) storage, respectively: 1, standardized storage: (In a normalized data model, the address document contains a

One: introduction of Shards It is a kind of database cluster system that expands the massive data horizontally, the data table is stored on each node of sharding, and the user can easily construct a distributed MongoDB cluster by simple

Golang connecting MongoDB Required Packages: "Labix.org/v2/mgo" "Labix.org/v2/mgo/bson" //Connect to database     session, Err: = MgO. Dial ("10.127.2.19:27017")//server and port to connect to         if Err! = Nil {              panic (err)

# mongod.conf#where to logLogpath=/opt/mongodb/mongod.logLogappend=true# fork and run in backgroundFork=trueport=27017maxconns=5000Quiet=truenssize=2047Dbpath=/mongo/replset/data#dbpath =/opt/mongodb/replset/dataProfile=0#slowms =100#smallfiles