So, You still have opportunity to move ahead in your career in GitHub Development. A collection is the equivalent of a table which is created in any other RDMS such as Oracle. // Important:: You must pass the session to the operations, // Delete All Documents that Match a Condition, // Delete Only One Document that Matches a Condition, // To view all indexes on the people collection, // To list all the collection indexes in a database, // The following command removes all indexes from the accounts collection, // Returns all stores containing any terms from the list “coffee”, “shop”, and “java”, // Returns all documents containing “coffee shop”, // Returns all stores containing “java” or “shop” but not “coffee”, "oldestRequiredTimestampForCrashRecovery". Top 25 Node.js Interview Questions & Answers . Therefore, if your application is write-heavy, indexes might affect performance. The index stores the value of a specific field or set of fields, ordered by the value of the field. Question4: Is LDAP authentication supported? Also, this will help you to turn your programming into your profession. Returns the representation of the object as a hexadecimal string. database.collection.insert (document) is used for inserting the document. For a single ACID transaction, if you try performing an excessive number of operations, it can result in high pressure on the WiredTiger cache. 250+ Mongodb Interview Questions and Answers, Question1: What are NoSQL databases? Sign up for free Dismiss master. ExpressJS Interview Questions & Answers Why our jobs site is easy for anyone to learn and to crack interview in the first attempt? 4. At most, process 1000 documents at a time. To perform text search, MongoDB uses a text index and the $text operator. NOTE: This is a common Maven Interview Question that you must know.. 2. Node.js is a Server side scripting which is used to build scalable programs. Sparse indexes are a subset of partial indexes. A replica set can have only one primary capable of confirming writes with { w: "majority" } write concern; although in some circumstances, another mongod instance may transiently believe itself to also be primary. employee.insert( { eid: 763357, age: 45, salary: 56489.40 } ), employee.insertMany( { [ emp_id:1, ename:”AAA” ] } ), inventory.find( { $nor: [ { stocklevel: { $lt:20 } },{ stocklevel:{ $gt:50 } } ] } ), db. Top 20 MongoDB Interview Questions & Answers . This book is appropriate for novice as well as for senior level professionals who want to strengthen their skills before appearing for an interview on MongoDB. By this Pyspark Interview Questions and answers, many students are got placed in many reputed companies with high package salary. An index will cover a query if it satisfies the following conditions: Since all the fields present in the query are part of an index, MongoDB matches the query conditions and returns the result using the same index without actually looking inside the documents. It is better to be safe to remove the attribute. Tagged with career, mongodb, fullstack, tips. This comes to the end of MongoDB interview questions and answers. A sparse index only contains elements for the documents that have the indexed field, even if it is null. does not support such relationships. Every node and edge has a unique identifier. In this blog, we would discuss the top 50 MongoDB interview questions answers for intermediates, advanced workforce, and job interviews. Save my name, email, and website in this browser for the next time I comment. The purpose of using a NoSQL database is for distributed data stores with humongous data storage needs. Instead, mongo insert inserts a new document into a collection. 30+ Top MongoDB Interview Questions and Answers (2018 Update) Skip to content. db.createCollection (name, options) is used to create a collection mongodb. 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Replication allows to increase data availability by creating multiple copies of data across servers. MongoDB  Interview Questions and answers are very useful to the Fresher or Experienced person who is looking for the new challenging job from the reputed company. The database management system (DBMS) enforces a partial schema as data is written, explicitly listing collections and indexes. The $unset operator deletes a particular field. A partial index is an index that contains only a subset of the values based on a filter rule. It is only when there is additional time slot, there will be no piece of information was a few choices, but the lump is more than 1, data is far from a lot of slices and can be extended up to 64 MB. To query if the array field contains at least one element with the specified value, use the filter { : } where is the element value. It also gives an opportunity to the companies to store the massive amount of structured and unstructured data in real time. The first block is memory and the second block is "my disc". snapshot() traverses the index on the _id field and guarantees that the query will return each document no more than once. In this case, we have created a compound index where the first entry is the value of the city field, the second is the value of the age field, and the third is the person.name. The group of instances which host similar data set is known as a replica set. MongoDB supports multiple storage engines, as different engines perform better for specific workloads. To have a great development in MongoDB  work, our page furnishes you with nitty-gritty data as MongoDB  prospective employee meeting questions and answers. Column-oriented databases work on columns and are based on BigTable paper by Google. Are you searching for the MongoDB Questions and Answers? But Mongo follows the exact opposite way of what we do with SQL. By default, each collection has a single field index automatically created on the _id field, the primary key. Install MongoDB in Windows 10 - Zip Package - In this quick article, we will learn how to install step by step MongoDB zip version in windows 10.; Java MongoDB Connection Example - This tutorial shows how to write a Java program to connect to a standalone MongoDB server. MongoDB - Relationships - Relationships in MongoDB represent how various documents are logically related to each other. If the primary member fails for any reason (e.g., hardware failure), one of the secondary members is automatically elected to primary and begins to process all reads and writes. the process of storing the record in multiple Machine is know has sharing. Therefore, the list is kept in a lump of dough of all substances, it is either in size. Learn more. For example, high query rates can exhaust the CPU capacity of the server. The db.collection.insert() provides no upsert possibility. All fields in a query are part of an index. MongoDB is a document based database, which does not use the concept of tables and columns, instead of which it uses the concept of documents and collections. DB.DBNAME.find ().limit (number), Sum, Avg, Min, Max, Push, addToSet, first, last. It helps improve your experience using FSC! Last active Oct 12, 2020. Replica sets provide redundancy and high availability, and are the basis for all production deployments. Summates the defined values from all the documents in a collection, Calculates the average values from all the documents in a collection, Return the minimum of all values of documents in a collection, Return the maximum of all values of documents in a collection, Inserts values to an array but no duplicates in the resulting document, Inserts values to an array in the resulting document, Returns the first document from the source document, Returns the last document from the source document, Only single field indexes can have the TTL option, a capped collection cannot have a TTL index, We want to index the most relevant and used values in the query conditions, We want to index the most selective values of a field. MongoDB supports replica sets, which can have up to 50 nodes. GitHub Gist: instantly share code, notes, and snippets. Replica sets help prevent database downtime using native replication and automatic failover. It uses Structured Query Language SQL to access and transfer the data and commands such as 'SELECT', 'UPDATE', 'INSERT' and 'DELETE' to manage it. A MongoDB sharded cluster consists of the following components: Aggregation in MongoDB is an operation used to process the data that returns the computed results. GridFS as I hear, is used for storage and for the most retrieving files, images, video files. With this kind of index we can improve all the queries that find documents with a condition and the age field, like the following: A compound index is an index on multiple fields. MongoDB also supports bulk insert through the db.collection.insertMany(). 6) … Transactions take plenty of time to execute and somehow they can slow the performance of the database. You signed in with another tab or window. With single field index, MongoDB can traverse in ascending and descending order. pwd: passwordPrompt(),  // Or “”. Wide-column stores store data in tables, rows, and dynamic columns. Start, configure, and manage running mongod. Without indexes, MongoDB must perform a collection scan, i.e. To return aggregated statistics related to all of the outgoing connection pools used by the mongos, connect a mongo shell to the mongos with , and run the connPoolStats command: db.adminCommand(“connPoolStats”); Sometimes. Master the skills of data modeling, ingestion, query and sharding with the MongoDB Developer and Administration Certification training course. An edge gives a relationship between nodes. Posted by L.V. By using the profiler, you will find all the queries which are slower than usual. Related information is stored in different tables but the concept of JOIN operations simplifies the process of correlating it and performing queries across multiple tables and minimize the chances of data duplication. MongoDB uses sharding to support deployments with very large data sets and high throughput operations. Traversing relationships as fast as they are already captured into the DB, and there is no need to calculate them. 11 Painful Git Interview Questions and Answers You Will Cry On Published Jul 31, 2018 Last updated Jan 27, 2019 According to the latest Stack Overflow developer survey, more than 70 percent of developers use Git, making it the most-used VCS in the world. The snapshot() method can be used on a cursor to isolate the operation for a very specific case. This kind of feature is very useful when we are dealing with data that don't need to persist in the database ( eg. What is MongoDB? More over the BSON data structure used by MongoDB can easily have varying sets of data and fields with different types. You Have Unsubscribed from All Communications! In-Memory Storage Engine is available in MongoDB Enterprise. Thursday, November 26 2020. The basic advantage is, we have a reduced cycle from 60 seconds to 200 milliseconds. Various fortune 1000 organizations around the world are utilizing the innovation of MongoDB  to meet the necessities of their customers. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. It may take 10-30 seconds for the primary to be declared down by the other members and a new primary elected. Blog Interview Questions MongoDB Interview Questions and Answers. By this MongoDB  Interview Questions and answers, many students are got placed in many reputed companies with high package salary. © 2020- BDreamz Global Solutions. This Git Interview Questions blog is a part of parent blog DevOps Interview Questions. MMAPv1 is a B-tree based system which powers many of the functions such as storage interaction and memory management to the operating system. Fields are analogous to columns in relational databases. Work fast with our official CLI. By default configuration, MongoDB writes updates to the disk every 60 seconds. 3 and of the sea There are, however, latae sententiae, which are mongodb scaling: High performance and high availability. If nothing happens, download Xcode and try again. ; Java MongoDB Create Collection Example - This tutorial shows how to create a collection in MongoDB using Java. Last active Oct 12, 2020. As cursor is not isolated during its lifetime, thus intervening write operations on a document may result in cursor that returns a document more than once. Snapshot () method is used to separate them from coming in with cursors writes. View Disclaimer, Are You Interested in MongoDB Course ? Whatever the case, you should check these top MongoDB interview questions and answers, and be ready for anything. Comprehensive, community-driven list of essential MongoDB interview questions. drop collection in MongoDB is db.collection.drop(). As such, you can switch to a non-existent database (use ) and perform the following operation: Write operations may require updates to indexes: If a write operation modifies an indexed field, MongoDB updates all indexes that have the modified field as a key. Mongodb provides Crud are created, Read, Update, Delete. After practicing the basic interview questions, it’s time to level up with Django interview questions for experienced professionals. What matters are aggregations process data records and return the results of counting. These are multi-statement operations that need to be executed sequentially without affecting each other. These indexes are the hashes of the field value. We Offer Best Online Training on AWS, Python, Selenium, Java, Azure, Devops, RPA, Data Science, Big data Hadoop, FullStack developer, Angular, Tableau, Power BI and more with Valid Course Completion Certificates. After a specified interval, which is called a "journal commit interval", the private view writes those operations in journal directory (residing in the disc). syntax : as the data is readily available in a column. Maven provides developers a complete build lifecycle framework. MongoDB is a document-based database which is highly scalable, and offers better performance. Indeed we need to de-normalize and fit it into a collection of multiple documents. By this Oracle DBA Interview Questions and answers, many students are got placed in many reputed companies with high package salary. Any changes due to document transaction do not impact performance for workloads not related or do not require them. When creating an index on an array, MongoDB will create an index entry for every element. Display all documents from the collection using find() method. NoSQL interview questions: NoSQL can be termed as a solution to all the conventional databases which were not able to handle the data seamlessly. Use Git or checkout with SVN using the web URL. Download PDF. MongoDB Interview Questions and Answers. It is an open source database and prominent NOSQL database. With MongoDB, replication is achieved through a Replica Set. These pools do not shrink when the number of clients decreases. On WiredTiger databases, this command will release unneeded disk space to the operating system. MongoDB has a faster write speed because it does not have to worry about transactions or rollbacks (and thus does not have to worry about locking). In MongoDB (4.2), an operation on a single document is atomic. If the primary is unavailable, an eligible secondary will hold an election to elect itself the new primary. Sign In. What would you like to do? MySQL is a popular open-source relational database management system (RDBMS) that is developed, distributed and supported by Oracle Corporation. 5. In case you’re searching for MongoDB  Interview Questions and answers for Experienced or Freshers, you are at the correct place. It updates the immediately written to the journal but writing the data from journal to disk happens lazily. String, Integer, Boolean, Double, Array, Timestamp, Date, Regular expression. These documents are stored in MongoDB in JSON (JavaScript Object Notation) format. Sign up. In this way, despite everything you have the chance to push forward in your vocation in MongoDB  Development. Thanks for letting us know! 2) What is “Namespace” in MongoDB? 1) Explain what is MongoDB? The first things to write replicas but embraced the culture. That is, oplog operations produce the same results whether applied once or multiple times to the target dataset. "the", "a", "or"). MongoDB allows flexible schema representation instead of relying on fixed tables and columns. Clients can iterate through a cursor to retrieve results. Documents can be stored and retrieved in a form that is much closer to the data objects used in applications, which means less translation is required to use the data in an application. ObjectId() Returns a new ObjectId value. GitHub is where the world builds software. It’s additionally the quality server framework for Node JS. Collections contain sets of documents and function which is the equivalent of relational database tables. NoSQL interview questions: NoSQL can be termed as a solution to all the conventional databases which were not able to handle the data seamlessly. MongoDB's aggregation framework is modeled on the concept of data processing pipelines. All gists Back to GitHub Sign in Sign up Sign in Sign up {{ message }} Instantly share code, notes, and snippets. Our Pyspark Questions and answers are very simple and have more examples for your better understanding. Maven provides developers a complete build lifecycle framework. db_adminCommand ( “connPoolStats”); See the connection is not used. the process of synchronization across the multiple server os know has replication. As to the execution. The _id field is like the document's primary key. Interview Questions - Apps on Google Play This app gives you wide range of interview questions and answers in 13 most wanted web development technologies. Embed. It can also be classified as NoSQL database program. According to research GitHub has a market share of about 52.45%. We hope you liked our explanation. inventory.find ( { stocklevel : { $gte: 20, $lte: 50 } } ), Only the first matching document is deleted, employee.aggregate( [ { $sort: {ename:1} } ] ), inventory.createIndex( { “stock.quantity”:-1 } ). The following example ( using Node.js ) creates a single key descending index on the name field: MongoDB supports the following types of the index for running a query. By default MongoDB creates a unique index on the _id field during the creation of a collection. The possible models are as follows: To save backups of the old files “Journaling” feature is used in MongoDB databases. There are lot of opportunities from many reputed companies in the world. When used with $ to match an array element, $unset replaces the matching element with null rather than removing the matching element from the array. Example: Multi-Document ACID Transactions in MongoDB. Configure optimal duration for the execution of the transaction from the default 60 seconds provided by MongoDB. Journaling is the use of the back of the mongodb to be saved. Top 20 MongoDB Interview Questions & Answers . If the field does not exist, then $unset does nothing. As a NoSQL database, MongoDB is considered schemaless because it does not require a rigid, pre-defined schema like a relational database. Start Your Free Software Development Course. With distributed transactions, transactions can be used across multiple operations, collections, databases, documents, and shards. The nested document structure makes it easy to retrieve complete address information about this customer with just a single query. 1. This book is equally helpful to sharpen their programming skills and understanding MongoDB in a short time. In general, we should structure our schema so that application receives all of its required information in a single read operation. A single field index is used to create an index on the single field of a document. These questions will help you with the technical interviews for a backend-developer role. Here is the query to find objects between two dates: Data used by multiple documents can either be embedded (denormalized) or referenced (normalized). A replica set contains a primary node and multiple secondary nodes. It routes the reading requests to the replica to reduce the reading pressure on the primary node. MongoDB is a document-oriented NoSQL database used for high volume data storage. MongoDB Interview Questions and answers are prepared by 10+ years experienced industry experts. Types of NoSQL databases: Document Oriented; Key Value; Graph; Column … It employs the format of key-value pairs, here called document store. MongoDB provides various features, such as authentication, access control, encryption, to secure your MongoDB deployments. Graph databases store data in nodes and edges. Use the $text query operator to perform text searches on a collection with a text index. So utilize our Oracle DBA Interview Questions and answers to grow in your career. Mongos use db_adminCommand (“connPoolStats”); A replica set is the group of magodb instance which is host in same data set. For situations that require atomicity of reads and writes to multiple documents (in a single or multiple collections), MongoDB supports multi-document transactions. MongoDB Interview Questions Q. mongoexport provides a method to export data from a mongod instance into JSON, CSV, or TSV. As part of the process, it gets written to actual data directory from the shared view (as this process happens in background). Particular elements can be indexed for faster querying. Text index supports searching for string content in a collection. Click here, Become a MongoDB Certified Expert in 25Hours, Become a MongoDB Expert with Certification in 25hours. Subjecting a large number of documents to a transaction may exert excessive pressure on the WiredTiger engine and since it relies on the snapshot capability, there will be a retention of large unflushed operations in memory. An array field can be indexed in MongoDB. Documents that tend to share a similar structure are organized as collections. mongod –port 27018 –dbpath C:\Aj\data\db –logpath C:\Aj\logs\mongodb.log — smallfiles, MongoDB provides clients the ability to perform write operations in bulk. What are the different types of NoSQL databases? Its important features are: Flexible data model in form of documents; Agile and highly scalable database; … The $lookup stage passes these reshaped documents to the next stage. Node.js is a Server side scripting which is used to build scalable programs. What is MongoDB ? This is especially useful if a server crashes or hardware failure. Enroll today. Details Last Updated: 02 December 2020 . It was developed by MongoDB Inc.In MongoDB, a namespace is a combination of the database name and collection or index name. Our Oracle DBA Questions and answers are very simple and have more examples for your better understanding. For the best database performance on the transaction, developers should consider: Always modify a small number of documents in a transaction. Details Last Updated: 22 October 2020 . 3. The nUpserted with value "1" indicates a new document is inserted. If you create a new document without an _id field, MongoDB will automatically create the field. MongoDB is … MongoDB transactions can exist only for relatively short time periods. The storage engines whose performance differ in accordance to some specific workloads to retrieve complete address information about customer... Json, CSV, or the node is down for other reasons you... Performance for workloads not related or do not impact performance for read-heavy workloads, and be ready for.. These 51 Questions and answers on MongoDB called replication Now and get 2 Course ₹25000/-... With large data sets and high availability and easy scalability is `` disc! Transient network hiccups may result in abortion of the amount of data because it does so directly. Document-Level concurrency model, the index on the _id field, MongoDB writes updates the! Key components of the working set training on the age field it was developed by MongoDB can easily have sets. Return sorted results by using the same specification does not require a,... Stage groups the documents into an aggregated result and try again procure vocation. A replica set great development in MongoDB is easier to shard ( use in a collection of multiple and... Of Brunfelsia same knowledge of the index to limit the value of field. 50 MongoDB Interview they are already captured into the database management system ( DBMS ) enforces a partial to! Large number of read operations required to support text search, MongoDB doesn ’ t support foreign key a!: to save document into the database and each partition is known as a hexadecimal string for data. And website in this way can not contain duplicate entries experienced industry experts common MongoDB configurations and of! Over the BSON data structure, as opposed to XML which allows you to turn your programming your. Documents into an aggregated result or high throughput operations throughput for write.... Description exceed this limit, the address documents contain a condition on the commonly! 16 Stars 29 Forks 12 of its required information in a cluster ) because it does n't have to about., ingestion, query, aggregation, tunable consistency and durability levels, and operations. A department document can have up to 50 nodes collection when you add members at different.... Mongodb Expert with Certification in 25Hours, Become a MongoDB profiler is to show the performance and high.! 16Mb size constraints to display in formatted way cluster is down for reasons! Would index each value of another field top MongoDB Interview Questions and answers to calculate the of... Has replication distributed on to multiple servers, adding additional servers to increase capacity as required document that is by! Are dealing with data that do n't need to calculate the SUM of the transactions API results of.... Benefit from the collection a reduced cycle from 60 seconds to 200 milliseconds GitLab Interview Questions and documents and... Questions, soon we will come with the following documents: MongoDB is a group mongo. Documents at a time key, to select those documents that match the query.... I 'm Hiring Devs Unlock 3877 answers for: in MongoDB using.. A minimized need for transactions optimal duration for the orders collection: db.orders.stats ( ).limit ( )... The functions such as Oracle, the address documents contain a reference to the next I. A primary key support caching in system memory so it increases data output performance Unlock 3877 answers Interested MongoDB... Mongo DB ( NoSQL database because documented oriented ( do ) eliminates the prerequisites of a. Being utilized as a result, it retains them in-memory for more predictable data latencies allows to data. Simpler data models make Administration and tuning requirements lesser in NoSQL document can have up 50. Classified as NoSQL database MongoDB is a combination of the most retrieving,. Would discuss the top 50 MongoDB Interview Questions the single field index an! Mock interviews, dumps and Course Materials from us be executed sequentially affecting. Non-Blocking I/O the replica to reduce the size of the values based on a cursor to complete. To get the best job in the database management system ( RDBMS ) that is developed, distributed and by. Creates more work ( e.g aspire to reach high perfection in MongoDB work, our page furnishes with. Mongodb allows flexible schema representation instead of using a NoSQL database because documented oriented ( do.! Dba Questions and answers 4.2 will extend support for sharded deployments format key-value... It has to be used with MongoDB are really useful to have great! Guideline for the MongoDB Developer database stores entities as well experienced Developer,! Are represented as follows: the callback for withTransaction must be async and/or return a Promise different types use replica... Data latencies a mmap ( ) bsondump converts mongoimport provides a document-level concurrency model, the prominent non-blocking! That it fits the 16MB size constraints 6 ) … 30+ top MongoDB Interview Questions answers. Query is one of the transaction is achieved through a cursor to isolate operation. The chance to push forward in your real projects or … 250+ GitLab Interview Questions and answers and to Interview... Pages linked from a collection to drop the MongoDB Crud click here, Become a MongoDB Expert Certification! Predictable data latencies and indexes it fully recovers, aiding the new document into a mongod instance eliminates! Matters are aggregations process data records and return the results are of the array size and element.! On _id is automatically created on the file system and examples of best-practice configurations common! Powerful servers that are to be executed sequentially without affecting each other a hash according to Wikipedia, would! Aggregate function can be used with MongoDB, a single field index created... Output performance you remove a document database that can store data in order for the document in. Devops Interview Questions: MongoDB is being utilized as a result, has. Engines are: WiredTiger is the index system ( DBMS ) enforces a partial index is useful. Older ” versions of data and real-time web apps and another might a! Understanding in Vue JS development actually faced in real Interview sharpen their programming skills and MongoDB. Package salary of single column databases are a simpler type of index that is supported by Oracle Corporation by! Include any field whose value is a document-oriented NoSQL database support caching in system memory so it increases output!, if the defined errors are presented and free in nature from database, and job interviews to! Are prepared by 10+ years experienced industry experts manage projects, and compression, among other features extend... Like in RDMS wherein it is consider has NoSQL database program archive the current Log and... It uses memory mapped files to access data rewrites and defragments all data and real-time apps. Mongodb document structure makes it easy to scale and be ready for anything will. Data are kept only in memory the rows which can have its employee document s. Be classified as NoSQL database because documented oriented ( do ) Bin­ary JSON ) ) syscall methodology they slow... No more than 100+ MongoDB Interview Questions and answers for beginners and experts de-normalize and it..., addToSet, first, last display from the collection one at a time i.e. Client requests complete, the prominent being non-blocking I/O index name sets help prevent downtime... Students are got placed in many reputed companies with high package salary to offer data redundancy and high throughput can! All the fields here are defined in ascending order feature is very useful when are... Is db.collection.drop ( ), which are the different types of NoSQL with... A virtual memory through a cursor to isolate the operation for a query Google! Can include any field whose value is a group of instances which host similar data set Materials from us of! In multiple Machine is know has replication close existing connections also gives an opportunity to the.... Be async and/or return a Promise operator to perform the aggregate mongodb interview questions and answers github in MongoDB.! Answers for beginners and experts the createIndex ( ).limit ( number ), which are the unit. Grow in your career and element positions the storage engines are: WiredTiger is the group of instances host! The city and age field Question1: What are NoSQL databases using Java has multiple addresses associated him. Offers better performance and are based on a collection stores with humongous data storage needs supports many features like repair., multi-document ACID transactions with snapshot isolation categories defined by the columns operation since they a... For beginners and experts moving back and forth between applications and storage DBA Interview for! In abortion of the index to limit the value display from the collection 's has. Availability and easy scalability it supports full indexing, query and sharding with the following can benefit the... Must perform a collection with a text index mysql is a cross-platform document-oriented database program, writes and strong reads! Document inside the another the new primary for Visual Studio and try again keys and values values. Used on a collection of multiple documents and operates in many reputed companies in the world utilizing. Data on different database servers easy to traverse form index defined this way can not make writes to a,... Other SQL databases any that tends to exceed this limit, the index 's. Of synchronization across the sharded cluster our MongoDB Questions and answers to in... While they were small, given the relations amongst those entities the there... Resource, such as a replica set AWS Solutions Architect & SysOps!. Images, video files in any other RDMS such as Oracle, the prominent being non-blocking I/O isolated! Asked Interview Questions and answers on MongoDB operations add new documents to field...

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