mongodb query performance

Clever Use of Mongodb for geographic space query, mongodb geographical space MongoDB is a distributed file storage-based database. Written in C ++. It is designed to provide scalable, high-performance data storage solutions for WEB applications.In mobile development, positi

it by the date field of another index (the index is created in reverse order, and the sorting is also in reverse order ), and the performance of 10 records is returned after the skip100 records. The impact of skip and order on the performance is measured. 7) query the performance of 100 records (that is, KB) (no sor

, and the sorting is also in reverse order ), and the performance of 10 records is returned after the skip100 records. The impact of skip and order on the performance is measured. 7) query the performance of 100 records (that is, KB) (no sorting and no conditions). This test is to test the

The performance test of MONGODB billion data volume was carried out, and the following items were tested:(All inserts are single-threaded and all reads are multithreaded)1) Normal insertion performance (the inserted data is about 1KB per piece)2) Bulk Insert performance (using the official C # client's Insertbatch), wh

MongoDB collection document creation, modification, deletion, and query command summary, mongodb modification and Deletion Install mongodb in windows. Start it. Previous Article: mongoDB Installation Details 1. log on to view the collection documents in the database to add,

Find () methodTo query the collection data from MongoDB, you need to use the MongoDB find () method.GrammarThe basic find () method syntax is as follows>db. Collection_name. Find() The Find () method displays all the files in an unstructured manner.Pretty () methodThe results are displayed in a formatted manner and can be used with the pretty () method.Gram

Detailed examples of PHP operations on MongoDB databases (add, delete, modify, and query) (6). mongodb DatabasePHP operations on mongodb:Modules are required for PHP to operate mongodb.Official website can download: http://pecl.php.net/package/mongo downloadSet mongodb to user-authorized Startup ModeThe php Manual does

Yesterday's SQL Server query performance optimization-index creation principle (I) mainly introduced the principle. today are some of the main principles and checks the created indexes. Iii. indexing principles In general, building indexes depends on the data usage scenarios. In other words, which SQL statements are commonly used to access data? Are these statements missing indexes (or there may be too many

Related Materials 1. MongoDB for Java driver package Https://github.com/mongodb/mongo-java-driver/downloads 2,Online document Http://www.mongodb.org/display/DOCS/Java+Language+Center Operation 1. query all data in a table (called a set in MongoDB ). Java code dbtest. Java Package COM. archie.

, indicating that the recordis a meet the requirements. As for this example, it is certainly easy to do so with other queries. It's easy to demonstrate and easy to do. $where Query method is suitable for complexof the query. It's very powerful, but it's not recommended, it's going to sacrifice performance, but I don't know about that. As for what to add, think ab

, unless it is set to 0, the field will not be returned. Specify the return field, sometimes the document field is many and the data is large, we specify to return the fields we need, so as to save the amount of data transferred, reduce memory consumption, improve performance, when the data is large, performance is obvious. 1. Querying data (1) Returns all documents in the collection: Db.collection.find (

reverse order ), and the performance of 10 records is returned after the Skip100 records. The impact of Skip and Order on the performance is measured. 7) query the performance of 100 records (that is, KB) is not sorted and there are no conditions). This test is the impact of query