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Contribution to MongoDB topic (#343)

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* Responding to questions in Puppet section

* responding to some MongoDB questions.

* responding to some MongoDB questions

* fixing the empty space

* fixing a typing error

* Update README.md

Co-authored-by: andrzejsydor <andrzejsydor@users.noreply.github.com>
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Bilalbsd 2023-02-02 11:59:41 +01:00 committed by GitHub
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README.md
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@ -1259,18 +1259,27 @@ as key-value pair, document-oriented, etc.
<details>
<summary>What is a document? What is a collection?</summary><br><b>
* A document is a record in MongoDB, which is stored in BSON (Binary JSON) format and is the basic unit of data in MongoDB.
* A collection is a group of related documents stored in a single database in MongoDB.
</b></details>
<details>
<summary>What is an aggregator?</summary><br><b>
* An aggregator is a framework in MongoDB that performs operations on a set of data to return a single computed result.
</b></details>
<details>
<summary>What is better? Embedded documents or referenced?</summary><br><b>
* There is no definitive answer to which is better, it depends on the specific use case and requirements. Some explainations : Embedded documents provide atomic updates, while referenced documents allow for better normalization.
</b></details>
<details>
<summary>Have you performed data retrieval optimizations in Mongo? If not, can you think about ways to optimize a slow data retrieval?</summary><br><b>
* Some ways to optimize data retrieval in MongoDB are: indexing, proper schema design, query optimization and database load balancing.
</b></details>
##### Queries
@ -1285,6 +1294,9 @@ as key-value pair, document-oriented, etc.
<details>
<summary>What is the difference between find() and find_one()?</code></summary><br><b>
* `find()` returns all documents that match the query conditions.
* find_one() returns only one document that matches the query conditions (or null if no match is found).
</b></details>
<details>
@ -2029,7 +2041,7 @@ This is where data is stored and also where different processing takes place (e.
<details>
<summary>What is a master node?</summary><br><b>
Par of a master node responsibilites:
Part of a master node responsibilites:
* Track the status of all the nodes in the cluster
* Verify replicas are working and the data is available from every data node.
* No hot nodes (no data node that works much harder than other nodes)