10 Typical Mistakes in MySQL

Millions of people conduct their business via the Internet. They create websites to advertise and sell their products/services, find customers, suppliers, partners, etc. Every website, as well as programmer, ought to deal with databases and so, perfectly master MySQL. MySQL is a specific open-source management system, which helps to work with relational databases that follow client-server models. It collects relevant data, which is necessary for adequate work with clients using the online connection.

Many students who prefered computer science obligatorily study this database system and face great difficulties. Thus, they frequently ask for MySQL homework help from expert programmers online. They know that professional specialists can solve their assignment complications. Nevertheless, you can become a great specialist if you try harder. Oftentimes, you can avoid mistakes if you know them. Thus, we’ll highlight 10 typical mistakes in MySQL.

Not Understanding Four Fundamentals 

Many inexperienced users don’t understand four fundamental resources, which are:

  1. CPU;
  2. Disc;
  3. Memory;
  4. Network.

If any of these resources is weak and misunderstood, you induce multiple complications. The whole database server will perform poorly and slowly.

Using MySQL as a Queue

You should never use MySQL as a Queue because you threaten the safety of your databases. Queues frequently sneak into the applications and their developers aren’t even aware of this huge threat. Accordingly, malicious programs and viruses can corrupt your data and increase the workload that leads to slowing down. This doesn’t allow for running processes simultaneously.

Forgetting Primary Keys

Many people forget the primary keys to their tables. It’s a serious mistake, which negatively reflects on the performance.  Every table has a primary key, which is responsible for its quick and adequate functioning. If you forget to insert the keys, all the processes will follow a standard protocol that is quite slow. Obligatorily use primary keys in every table. They automatically activate and control the indexes, which are responsible for the quickness of all operations. Each key is unique and so, its value is huge.

Using NOT IN or IN Statements Instead of JOIN

It’s not clever to use NOT In and In statements, because they aren’t properly optimized. As a result, all the sent data isn’t ordered. Under the condition, you have millions of orders, everything will run too slow. Replace these statements with a JOIN statement and make everything run smoothly and quickly.

Not Validating User Inputs

It’s of huge importance to verify the inputs of other users. You ought to validate every single code string. Dishonest hackers may easily log in using the directory “admin” and they don’t even need the password. Unfortunately, many specialists tend to rely on JavaScript which doesn’t promise 100% security. Always check user inputs to avoid the corruption of your databases.

Failing to Encrypt Password Fields

Another huge mistake is not to encrypt your password fields. It’s quite similar to the previous one. Specialists don’t use unique passwords to protect the website. As a result, hackers may easily access the data and use it for their own illegal purposes.

Not Understanding Indexes

Many folks have great problems with indexing. This is a pretty complex topic, which is misunderstood by many people. Nevertheless, you should give special heed to this crucial topic because it plays an important role in the normal work of servers. Otherwise, you’ll have many unnecessary complications. We can easily convince you that this frequently misunderstood topic is important. Take a look at three major functions indexing ensures:

  1. Helps to find groups of adjacent rows, which is much faster than finding single rows.
  2. Allows for reading the rows in the desired order, which is much cheaper and faster compared to sorting.
  3. Helps the server to satisfy entire queries using only the index and doesn’t even access the table to save more time.

Looping with Too Many Cursors

Oftentimes, users use too many cursors and they turn the work with MySQL into a real nightmare. Although they help to look through millions of records and statements, they aren’t quite applicable to this database. Too many cursors slow down all the processes. It’s better to replace them with properly written MySQL statements.

Not Saving Statistics

Most users ignore the storing of statistics. It’s a bad tendency because the history of statistics oftentimes reveals what’s wrong. When you see some problem, don’t ring the alarm. Check and analyze the statistics to identify the error.

Failing to Optimize the Queries

Finally, many users don’t properly watch their queries and it leads to negative outcomes. If you don’t optimize their functionality, all the process will be slow. Accordingly, it’ll be harder and longer to achieve the desired results.

If you’re dealing with MySQL, always keep in mind our article. Thus, you’ll be aware of the potential complications to successfully avoid them. Accordingly, everything will run smoothly, quickly, and error-free.

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