MongoDB supports user-defined indexes like single field index. A single field index is used to create an index on the single field of a document. With single field index, MongoDB can traverse in ascending and descending order. By default, each collection has a single field index automatically...
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General experience questions like this are jump-off points for more technical case studies. Typically, the interviewer will tailor questions as they pertain to the role. However, you should be comfortable with standard Python and supplemental libraries like Matplotlib, Pandas, and NumPy, know what’...
Advanced Hadoop Interview Questions Now, this is where things get interesting. These interview questions are asked to test you on an advanced level. These questions are particularly important for senior engineers. 11. What is the concept of active NameNode and standby NameNode in Hadoop 2.0? In...
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...
Big Data Modeling Interview Questions Now that we have covered big data storage, let’s move on to questions about organizing and structuring that data effectively. 11. What are the three types of data models? Data modeling organizes and defines how data is stored, accessed, and related in bi...
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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...
Automatic assembly: Spring Boot initializes all configured beans based on certain rules. It reduces a lot of repeated work. 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 au...