WordPress Error: Error Establishing Database Connection

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WordPress Error Error Establishing Database
Connection
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Introduction

• This message of error is usually faced by the
  user when the connection between their workspace
  and database is not developed, insecure or lost.
• The access to a database in WordPress is carried
  out in 4 pieces
• The database's name("DB_NAME")
• The username("DB_USER")
• The password("DB_PASS")
• The host("DB_HOST")

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Reasons for this error are

• High traffic in a number of database connections.
• Violated tables for the database.
• Wrong credentials in wp-config.php.
• Due to plugins installed recently.

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How to fix this error

• By disabling all plugins
• correcting the credentials in wp-config.php
• Repairing of MySQL database
• Checking the web host
• For additional help regarding troubleshooting
  errors in WordPress, visit WordPress customer
  help desk. Regarding other issues queries about
  your WordPress site, visit WordPress Services
  Support.