MongoDB没有使用传统的锁或者复杂的带回滚的事务,因为它设计的宗旨是轻量,快速以及可预计的高性能。可以把它类比成MySQL MylSAM的自动提交模式。通过精简对事务的支持,性能得到了提升,特别是在一个可能会穿过多个服务器的系统里。 33.启用备份故障恢复需要多久? 从备份数据库声明主数据库宕机到选出一个备份数据库作...
MongoDB Interview Questions and Answers Besant Technologies supports the students by providing MongoDB interview questions and answers for the job placements and job purposes. MongoDB is the leading important course in the present situation because more job openings and the high salary pay for this M...
MongoDB does not use traditional locking or complex transactions with rollback, as it is designed to be lightweight and fast and predictable in its performance. It can be thought of as analogous to the MySQL MyISAM autocommit model. By keeping transaction support extremely simple, performance is...
MongoDB compass is a GUI based tool that allows the users to view theMongoDBdata without using any query language. Any user can analyze the data and ad-hoc queries without having knowledge of query languages like NoSQL. You can easily explore the datasets and understand the query performances...
Amit has 12+ years of software engineering experience working with Ruby on Rails, mainly with MongoDB, PostgreSQL, Elasticsearch, and MySQL. He is also proficient in front-end technologies like HTML, CSS, JavaScript, jQuery, React, React Native, and AngularJS. Amit has excelled at product-bas...
TablePlus is one of the most widely used on-premisedatabase management clientssupporting multiple types of databases ranging from SQL databases, like MariaDB, MySQL, and NoSQL databases, such as MongoDB and Cassandra. It can connect to Redis servers as well. ...
$db − This is an optional field and contains the name of the database in which the referenced document liesConsider a sample user document having DBRef field address as shown in the code snippet −{ "_id":ObjectId("53402597d852426020000002"), "address": { "$ref": "address_home",...
The MongoDB client is a software tool or program that is used to interact with a MongoDB database. We can use it to connect databases, manage databases and collections, run queries, and perform CRUD operations on MongoDB databases. AdvertisementsSeveral MongoDB clients are available, including ...
Database Server and Client mysqld/Oracle mongod mysql/sqlplus mongoSample DocumentFollowing example shows the document structure of a blog site, which is simply a comma separated key value pair.{ _id: ObjectId(7df78ad8902c) title: 'MongoDB Overview', description: 'MongoDB is no sql databa...
madhu-manvit/mongodb-interview-questions Table of Contents MongoDB Commands MongoDB Coding Practice Q.What are NoSQL databases? What are the different types of NoSQL databases? NoSQL is a non-relational DBMS, that does not require a fixed schema, avoids joins, and is easy to scale. The ...