MySQL Redo Logs: MySQL Tutorial (SQL Basics)
In this mysql tutorial we’ll walk you through some sql basics – we’ll touch upon MySQL server redo logs in MySQL server 8.0.30 as well as in earlier versions of MySQL server.
Starting from MySQL 8, redo logs can be optimized by tuning the innodb_redo_log_capacity variable while in older versions of MySQL server, you would need to tune the innodb_log_file_size and innodb_log_files_in_group variables. Keep in mind that the innodb_log_files_in_group variable is now deprecated. When tuning the redo log capacity for MySQL, MariaDB or Percona Server, keep in mind that ideally redo logs should be able to hold an hour or so of traffic. The default value is 100MB.
To set the redo log capacity in older versions of MySQL server, configure the variable innodb_log_file_size to consume approximately a quarter of the InnoDB buffer pool, and on newer versions configure the variable innodb_redo_log_capacity to be able to hold at least an hour of traffic.
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Some of the most popular SQL interview questions and answers can be found below:
Q: MySQL password not working. What do I do?
A: Follow the SQL tutorial here: https://youtube.com/shorts/CBdyaqqEJqY
Q: MySQL MyISAM vs InnoDB. Which one to use?
A: Use InnoDB unless you intend to run COUNT(*) queries because MyISAM stores the row count inside of itself.
Q: What OS is the mysql my.ini file applicable to?
A: The file is applicable to a Windows OS.
Q: What’s the mysql my.cnf location?
A: The location of the file can vary, but some of the most common locations include:
* /etc/my.cnf (the most common location.)
* /etc/mysql/my.cnf
* /[datadirectory]/my.cnf
* ~/.my.cnf.
Q: What are some of the most popular SQL commands?
A: CRUD queries are the most popular SQL queries. They can be used to create (insert), read (select), update, or delete data.
Q: How dangerous is SQL injection? How to protect our web applications from this attack?
A: SQL injection is one of the most dangerous attacks targeting applications today. To protect our web applications from sql injection, we need to sanitize our inputs and never provide user input to a database.
Q: What file should be used for mysql server configuration?
A: my.cnf or my.ini.
Q: MySQL vs PostgreSQL. What are the main differences?
A: The main difference is that PostgreSQL is an object-relational DBMS while MySQL is a relational DBMS.
Q: What storage engine should we use in our MySQL install?
A: Use either InnoDB or Percona XtraDB. If there’s a necessity to run COUNT(*) queries, use MyISAM, because InnoDB and Percona XtraDB don’t store the row count internally while MyISAM does.
Q: What is the most frequently used type of SQL index?
A: A B-tree SQL index is used the most frequently in mysql server as well as other RDBMS systems.
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