1. _id: The_idfield represents a unique value in the MongoDB document. The_idfield is like the document's primary key. If you create a new document without an_idfield, MongoDB will automatically create the field. 2. Collection: This is a grouping of MongoDB documents. A collection is...
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For example, when using MongoDB, you only need to add the Starter package of MongoDB, configure the connection information, and then you can directly use MongoTemplate automatic assembly to operate the database. It decreases the dependency on Maven Jar packages and reduces the probability of cum...
SQL interview questions for data engineerscover fundamental concepts like joins, subqueries, case statements, and filters. In addition, if required to write SQL code, it could test if you know how to pull metrics or questions that determine how you handle errors and NULL values. Common SQL ques...
General Big Data Interview Questions Let’s start with the most general kind of questions. 1. Explain the 5 Vs of big data. The 5 Vs of big data are: Volume is the size of data generated daily. This includes in total the various mediums such as social media, IoT devices, and every...
要考虑的问题有:内存只有4G无法一次性读入10G文件,需要分批读入分批读入数据要记录每次读入数据的位置。分批每次读取数据的大小,太小会在读取操作花费过多时间。https://stackoverflow.com/questions/30294146/python-fastest-way-to-process-large-file 1.2 补充缺失的代码 ...
要考虑的问题有:内存只有4G无法一次性读入10G文件,需要分批读入分批读入数据要记录每次读入数据的位置。分批每次读取数据的大小,太小会在读取操作花费过多时间。 https://stackoverflow.com/questions/30294146/python-fastest-way-to-process-large-file2.补充缺失的代码def print_directory_contents(sPath): """ 这个...
Basic Hadoop Interview Questions 1. What is big data? 2. What is Hadoop, and how does it solve the problem of big data? 3. What are the two main components of Hadoop? 4. Define the role of NameNode and DataNode in Hadoop. 5. Explain the role of Hadoop YARN. Intermediate Hado...
MongoDB? 17. What is Multi Version Concurrency Control in PostgreSQL? 18. What is indexes in PostgreSQL? 19. What types of indexes are supported in PostgreSQL? 20. How to start PostgreSQL on Windows? 21. How to stop PostgreSQL on Windows? 22. What is the command to find a version of ...
Answer:MongoDB is an unstructured (at least, in definition) distributed document storage. For clearing purposes, you can think about it as a highly scalable and not-so-high-performance JSON storage (though actually, it uses BSON). It has a simple but effective multitype index system, replicati...