Posts about MongoDB
MongoDB Java
May 17, 2021 04:00 0 Comment MongoDB
MongoDB Java, MongoDB Java, Connect to the database, Create a collection, Gets the collection, Insert the document, Retrieve all documents, Update the document, Delete the first document, MongoDB Java, Environment configuration, If you want to use MongoDB in a Java program, you need to make sure that you have the Java environment and Mo
MongoDB database reference
May 17, 2021 04:00 0 Comment MongoDB
MongoDB database reference, MongoDB database reference, DBRefs vs manual reference, Use DBRefs, MongoDB database reference, In the previous section, we mentioned the MongoDB reference to regulate the data structure document., There are two types
MongoDB regular expression
May 17, 2021 05:00 0 Comment MongoDB
MongoDB regular expression, MongoDB regular expression, Use regular expressions, Case-insensed with regular expressions, Array elements use regular expressions, Optimize regular expression queries, MongoDB regular expression, A regular expression is a string that uses a single string to describe and match a series of strings that conform to a syn
MongoDB grows automatically
May 17, 2021 05:00 0 Comment MongoDB
MongoDB grows automatically, MongoDB grows automatically, Use the counters collection, Create a Javascript function, Use Javascript functions, MongoDB grows automatically, MongoDB does not have the same auto-growth capabilities as SQL, and MongoDB's _id is the system's automatically generated
MongoDB fixed collection
May 17, 2021 05:00 0 Comment MongoDB
MongoDB Fixed Collections (Capped Collections), MongoDB Fixed Collections (Capped Collections), Create a fixed collection, Pin the collection query, The functional characteristics of a fixed collection, Fixed collection properties and usage, MongoDB Fixed Collections (Capped Collections), The MongoDB Fixed Collection (Capped Collections) is a well-performing, fixed-size collection that, fo
MongoDB GridFS
May 17, 2021 05:00 0 Comment MongoDB
MongoDB GridFS, MongoDB GridFS, GridFS adds files, MongoDB GridFS, GridFS is used to store and recover files (e.g. pictures, audio, video, etc.) that exceed the 16M (BSON file limit)., GridFS is also a
MongoDB full-text search
May 17, 2021 05:00 0 Comment MongoDB
MongoDB full-text search, MongoDB full-text search, Enable full-text retrieval, Create a full-text index, Use full-text indexes, Delete the full-text index, MongoDB full-text search, Full-text retrieval establishes an index of each word, indicating the number and location of times the word appears in the a
MongoDB Map Reduce
May 17, 2021 05:00 0 Comment MongoDB
MongoDB Map Reduce, MongoDB Map Reduce, MapReduce command, Use MapReduce, MongoDB Map Reduce, Map-Reduce is a computational model that simply performs a large amount of work (data) decomposition (MAP) and then merges the res
MongoDB ObjectId
May 17, 2021 05:00 0 Comment MongoDB
MongoDB ObjectId, MongoDB ObjectId, Create a new ObjectId, Create a timestamp for the document, ObjectId is converted to a string, MongoDB ObjectId, We've already used MongoDB's Object ID in the previous chapters., In this section, we'll look at the structure of ObjectId., ObjectI
MongoDB index limits
May 17, 2021 05:00 0 Comment MongoDB
MongoDB index limits, MongoDB index limits, Additional overhead, Memory (RAM) usage, Query restrictions, Index key limit, Inserting a document exceeds the index key limit, Maximum range, MongoDB index limits, Additional overhead, Each index takes up a certain amount of storage space and needs to be operated on when inserting, updating,
Are recursive queries possible on mongodb?
Dec 08, 2021 04:00 0 Comment MongoDB
MongoDB 3.4 introduces the ability to perform recursive graph queries . It was co-released last November with version 2.0 of the BI connector, which provides the ability to query MongoDB using a SQL interface through tools like Tableau and Qlik.One may also ask, how to query a document in MongoDB b
How do i start mongodb?
Dec 08, 2021 04:00 0 Comment MongoDB
To start MongoDB, run mongod.exe from the Command Prompt navigate to your MongoDB Bin folder and run mongod command, it will start MongoDB main process and The waiting for connections message in the console.Also, how do I start MongoDB on Ubuntu? How to Install and Configure MongoDB on Ubuntu 19.04/
What does the bson stand for in mongodb?
Dec 08, 2021 04:00 0 Comment MongoDB
It is a binary form for representing simple data structures, associative arrays (called objects or documents in MongoDB), and various data types of specific interest to MongoDB. The name "BSON" is based on the term JSON and stands for "Binary JSON".Also Know, what is MongoDB documentation? A record
What is mongodb documentation?
Dec 08, 2021 04:00 0 Comment MongoDB
A record in MongoDB is a document, which is a data structure composed of field and value pairs. The values of the fields may include other documents, arrays, and arrays of documents (a group of documents is a collection, such as a table in RDBMS).Indeed, why is MongoDB a document-oriented database?
Why do i get duplicate key error in mongodb?
Dec 08, 2021 04:00 0 Comment MongoDB
Because of the unique constraint, MongoDB will only permit one document that lacks the indexed field. If there is more than one document without a value for the indexed field or is missing the indexed field, the index build will fail with a duplicate key error.Likewise, how to avoid duplicate entrie