SQL Indexes Explained: B-Tree Indexes in MySQL (SQL Tutorial)
In MySQL server and other database management systems, database indexing is a technique used by many developers and DBAs to improve the performance of search (SELECT) queries.
Thus, the usage of different kinds of a SQL index is one of the primary ways to improve SQL query performance.
This video will have one type of sql indexes explained – we’ll focus on B-Tree SQL indexes. While SQL indexes are explained in pretty much any sql basics book that exists, not many dive into the nitty-gritty details.
A B-tree database indexing technique is the most commonly used SQL index type in MySQL server, MariaDB, and Percona Server.
When such a SQL index is in use, MySQL server can make use of SQL search queries that use the certain keywords, and it can also speed up LIKE queries. Of course, SQL queries must be crafted adequately to help prevent SQL injection.
One of the primary reasons such a SQL index may be added to a column is to speed up search queries – when a b-tree SQL index is in use, the storage engine does not scan through the whole table to find relevant rows.
SQL indexes are one of the primary sql interview questions to this day – and while even an sql tutorial for beginners may answer a couple of questions regarding SQL indexes, it’s worth noting that they deserve an entire book written about them because there’s so much to say!
This sql tutorial will provide you with a couple of examples of SQL queries that may be using SQL indexes, as well as provide you with examples how not to write SQL queries.
Make sure that all of the SQL indexes you do add to your table are actually used by MySQL by running an EXPLAIN query.
Below you can find some of the most frequent SQL interview questions and answers:
Q: How to protect against SQL injection?
A: Don’t pass user input into a SQL query. You really don’t need to pass a mysql advanced tutorial to know this – it’s that simple!
Q: What types of SQL indexes exist?
A: There are B-Tree indexes, R-Tree indexes, hash indexes, covering indexes, clustered indexes, multicolumn or composite SQL indexes, and prefix indexes.
Q: What is the most popular type of a mysql index?
A: A B-tree sql index is the most popular type of a mysql index.
Q: MyISAM vs InnoDB performance – which one is better and why?
A: InnoDB – all of the features that were available in MyISAM are now available in InnoDB.
Q: Is there a sql full course or any mysql tutorial that would cover mysql storage engines in more detail in all complex aspects?
A: Not that we know of, but if needed, we’ll make a sql course talking about everything: sql basics, sql queries, sql vs nosql, sql for data analysis, etc.
Those who are interested more about their database performance with a SQL index should watch the video we’ve made earlier on:
sql indexes explained: https://youtube.com/shorts/V3l_8dEYDWQ
We’ve also made other videos about database performance issues, database performance tuning, and database performance testing.
One of our videos about database performance monitoring can be found here: https://youtube.com/shorts/J8z9W6vj478
A video depicting database slowness reasons and quickly explaining how to overcome database slowness can be found here: https://youtube.com/shorts/tTE8DELShHw
secure-file-priv MySQL video: https://youtube.com/shorts/Z8HLbV74f40
Enjoy this video and solve your database performance issues – make sure to perform database performance analysis and database performance monitoring to keep your SQL databases in a tip-top shape.
Subscribe to see in-depth tutorials about databases, and until next time.
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