mongodb query performance

Label:To use MongoDB in C #, you first have to have a mongodb-supported C # version of the driver. The C # version of the driver seems to have many kinds, such as the official Samus. The idea of implementation is mostly similar. Here we use the officially provided Mongo-csharp-driver:: Http://github.com/mongodb/mongo-csharp-driver/downloadsGet two DLLs after deco

the background so that other database activities are not blocked when the index is built. The default value is False. uniqueA Boolean that creates a unique index. The default value is False. nameA String that specifies the name of the index. If not specified, MongoDB generates an indexed field with the name and sort order concatenation. dropDups, Boolean, when a unique index is created, only the first one is retained if duplicate delet

Tags: BSP sel logs performance. So in the DES image configuration Server configuration:Cpu:1 Core Memory: 2048 MB (I/O optimized) network bandwidth: 1M CentOS 7.0 MongoDB 3.2MySQL 5.6 Server table Data volume 1,184,545 MongoDB data is imported by MySQL, ensure the data consistent experiment prepared to execute the statement as: MySQL:SELECT *From sharelooks_30

MongoDB is a product between a relational database and a non-relational database, and is the most versatile and most like relational database in a non-relational database. The data structure he supports is very loose and is a JSON-like Bjson format, so you can store more complex data types. MONGO's biggest feature is that the query language he supports is very powerful, and its syntax is a bit like an objec

, we just have to figure out when it's time to build a 2dsphere index, when it's time to build a 2d index, and then find the operator that works for that index is clear! In short, the latitude and longitude saved in the GeoJSON format must establish a 2dsphere index. The latitude and longitude saved in the Legacy coordinate Pairs format is only considered for the 2d index when the map is represented, and in other cases the 2dsphere index is selected. Resources: 1. The second edition of

This article describes a simple php tutorial on MongoDB operations, including connection, addition, modification, deletion, and query. For more information, see This article describes a simple php tutorial on MongoDB operations, including connection, addition, modification, deletion, and query. For more information, se

On the blog discussed, the database query data returned to the foreground JSP. The blog mainly uses Ajax calls to display a JSON string to get one of these fields, assigned to one of the controls in the interface. That this blog, we explain, the backstage list pass JSP display. List delivery interface, what we used to do in the past. A foreach El expression. or Java code. So how do you show the list in JSON format itself? It is obvious that an El form

Mongodb,get character queries need to pass in a specific wrapper ID to identify1Const ObjectID = require (' MongoDB '). ObjectID2 3Exports.queryone = (req, res) = = {4 Console.log (req.body)5Mongoclient.connect (URL,function(err, client) {6Assert.equal (NULL, err);7Const DB =client.db (dbName);8 //Get The Documents collection9Const COLLECTION = db.collection (' Documents ');TenConst ID =NewObjec

When it comes to queries, we generally think of relational database queries, such as order by (sort), limit (paging), range query (greater than a value, less than a value), in queries, on queries, like queries waiting a lot, and MongoDB also supports these operations, Just different syntax, such as the sort: MongoDB inside using the Skip (field:1/-1) method, the

Tags: Mongod alert term index turn script www change putsA question about the index document in MongoDB?- To illustrate index intersection, consider a collection orders which has the following indexes: {qty:1} {Item:1} MongoDB can use the intersection of the indexes to the following query: Db.orders.find ({item: "Abc123", Qty: {$gt: 15}}) The above is the ind