title: ERROR 1049 (42000): Unknown database 'tweetdata' Mysql
body: <p>I have MySQL installed on an Ubuntu machine. When I run <code>use TWEETDATA</code> command it shows me following error</p>
  
  <pre><code>ERROR 1049 (42000): Unknown database 'tweetdata'
  </code></pre>
  
  <p>But the database <code>TWEETDATA</code> does exist in the db. Below is the output of <code>show databases</code> command.</p>
  
  <pre><code>+--------------------+
  | Database           |
  +--------------------+
  | information_schema |
  | TWEETDATA          |
  | cs340              |
  | magento            |
  | mysql              |
  | ofbiz              |
  | ofbizolap          |
  | ofbiztenant        |
  | performance_schema |
  | sys                |
  +--------------------+
  10 rows in set (0.00 sec)
  </code></pre>
  
  <p>Any ideas what might be wrong here? Could the large size of database cause this. This db was working a couple of days ago and it has over 49 million rows in one table. Could this be an issue?<br>
  Furthermore, this is the change we made to <code>/etc/mysql/conf.d/mysql.cnf</code> file in this period</p>
  
  <pre><code>[client]
  default-character-set=utf8mb4
  [mysql]
  default-character-set=utf8mb4
  [mysqld]
  collation-server = utf8mb4_unicode_ci
  init-connect='SET NAMES utf8mb4'
  character-set-server = utf8mb4
  lower_case_table_names=1
  </code></pre>
  
  <p>Could this change have caused any trouble?</p>