MySQL for Beginners: The Recommended InnoDB Buffer Pool Size
In this short mysql tutorial we’ll walk you through one of the most important mysql interview questions related to the InnoDB buffer pool – how to set the MySQL InnoDB buffer pool such that it’s enough for your InnoDB-based infrastructure?
The SQL query you need to run to see the recommended InnoDB buffer pool size in GB is this one:
SELECT CEILING(Total_InnoDB_Bytes*1.5/POWER(1024,3)) AS recommended_size FROM (SELECT SUM(data_length+index_length) AS Total_InnoDB_Bytes FROM information_schema.tables WHERE engine=’InnoDB’) AS X;
Make sure to have the “AS something” (we used “AS X”) at the end becacuse otherwise, the sql query can fail.
This SQL query will provide you the recommended size of the InnoDB buffer pool in gigabytes with an additional 50% (multiply the Total_InnoDB_Bytes by 1.1 for an additional 10%, by 1.2 for an additional 20%, etc.)
Set the innodb-buffer-pool-size to this value in my.cnf, and you should be good to go.
This video should be useful for mysql beginners as well for advanced users of MySQL. Enjoy it!
Below you can find a couple of sql interview questions and answers – make sure to glance through them before attending your next sql interview!
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 is the file to adjust mysql server configuration?
A: The mysql my.cnf file on Linux or the mysql my.ini file on Windows is what you should look into. If needed, we’ll make a separate mysql tutorial for beginners on how it works. A mysql tutorial covering which storage engine – myisam vs innodb – to choose is available here: https://youtube.com/shorts/MpVWcYsJqn4
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.
Q: Is there a big data tutorial for those looking to work with big data on mysql server?
A: Yes, it’s available here: https://youtube.com/shorts/GurccdgcjL0
Q: I’ve heard that MyISAM performs row level locking?
A: No, that’s a common misconception.
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: 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.
The SQL query is not created by us. Credit to RolandoMySQLDBA @ DBA StackExchange.
Enjoy the video!
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