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See -- > http://www.w3resource.com/mongodb/shell-methods/collection/db-collection-dropIndex.php

But essentially you have, from the command line (terminal), you specify the collection (database) and index you want to remove. If you are unsure of what the index is called in the collection, you can type the following:

To figure you the the name of the unique constraint:

db.collection.getIndexes() - this will return a list of indexes

To remove a specific index:

db.collection.dropIndex( name_of_index ) 

And there you go!

Happy coding!

link: https://www.youtube.com/watch?v=rRoy6I4gKWU

https://www.sitepoint.com/sql-vs-nosql-choose/

Great resource to understand differences and when to use which -

https://www.sitepoint.com/sql-vs-nosql-differences/

Projects where SQL is ideal:

• logical related discrete data requirements which can be identified up-front
• data integrity is essential
• standards-based proven technology with good developer experience and support.

Projects where NoSQL is ideal:

• unrelated, indeterminate or evolving data requirements
• simpler or looser project objectives, able to start coding immediately
• speed and scalability is imperative.

Unique Indexes -

on Unique-

https://docs.mongodb.com/v3.2/core/index-unique/

** Particular of note is creating a unique index in which the attribute could have null values. This may arise in a situation like a secondary email - not everyone will have one, but you may want it to be unique. In that case, you may want to do something like this -

db.scores.createIndex( { secondary_email: 1 } , { sparse: true, unique: true } )

It is important to make sure that if this is done after having created the attribute  (i.e. secondary_email), then it is necessary to check and make sure that there exists no repeats of the secondary_email yet. If there are repeats that are not necessarily in use, you can $unset a value as so:

db.users.update({}, {$unset: {words:1}} , {multi: true});
// If only one, find user and remove multi

Here's a good primer on Indexes in general - https://docs.mongodb.com/manual/indexes/

HOW TO:

Print, view and save a portion of the web page through javascript. (no plugins)

Example:
Using jQuery select the portion you desire.

Now the variable myText has the text of the selected

class. 

After selecting the correct content, use a button (or any other trigger option) to initiate a javascript function called window.open(URL, name, specs, replace);

To use this function correctly you need to follow it up with document.write(); & document.close(); so that you can write on the new window and then be able to close. 

Example:

Click to View

In this example above, I set a variable called WinPrint to window.open(); and set some parameters -> all I did was add some style and left URL & name blank or empty string. 

Once the button #myTriggerButton is clicked, the code will run through each line. After the set variable (WinPrint), document.write(); writes on the new window WinPrint. Inside the parameters, I set my first variable myText. Then document.close(); will help finish the writing. Finally the WinPrint.focus(); is there to have the popup window (WinPrint) be the focus (or be first/in front) of any other windows open at the moment.

Tip: You are not limited to just text as the parameter in document.write();

 WinPrint.document.write(`

`)

 You can add tags like

or and add bootstrap classes and styling.

Summary

This is a very basic example of this use case. Now that you know how to select any part of a webpage through jQuery and open it in a new window with any custom style, you can print or save the new page as a .pdf file or whichever you desire super clean and simple. This is better than taking screenshots that could contain unnecessary content or messy styling and also helps you avoid the need to convert a file or figuring out a plugin. Save time and code!

link: https://blog.heroku.com/node-habits-2016

Here are some quick and easy tips!

1 - Start with npm-init for a project!

$ mkdir my-awesome-app
$ cd my-awesome-app
$ npm init --yes

2 - Cluster your app

3 - Garbage collection modification

---> 

web: node --optimize_for_size --max_old_space_size=920 --gc_interval=100 server.js

And...