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Category: InnoDB

What is the performance overhead of IFNULL in the select statement of mysql 5.7+ query

By adminPosted on February 5, 2023

Question : I’ve recently made an upgrade to a mysql query performed by my web server when serving request. There […]

Is the overhead of frequent query cache invalidation ever worth it?

By adminPosted on February 3, 2023July 3, 2022

Question : I’m currently working on a MySQL database where we are seeing a large number of invalidations from the […]

How mysql (innodb) handles auto increment column

By adminPosted on February 3, 2023

Question : I am working on a OLTP environment with multiple parallel write operation. I found this in documentation about […]

Restored database copy larger than original

By adminPosted on February 2, 2023

Question : I’ve created a copy of a database for testing. It’s on the same server as the original. However, […]

Unable to drop the table since its showing waiting for meta data lock

By adminPosted on February 1, 2023

Question : We are trying to drop one table but it’s getting hanged, and when we see the ‘SHOW PROCESSLIST’ […]

Speeding up SELECT FROM a large table

By adminPosted on January 29, 2023

Question : I have a large table (500M rows with ibd size of 1.5TB) CREATE TABLE t1 ( ID int(11) […]

In MySQL, when using InnoDB, what happens to the way data is laid out on disk when the primary key is dropped?

By adminPosted on January 29, 2023

Question : In MySQL, when using InnoDB, what happens to the way data is laid out on disk when the […]

InnoDB row metadata size (minimum row size)

By adminPosted on January 28, 2023

Question : I’m trying to decide whether to normalize a thing further, and need to know what the smallest a […]

What storage engine do I need – Mysql?

By adminPosted on January 26, 2023

Question : I have designed a database and came to the point of actually deciding which storage engine is better […]

Why is this simple join taking so long?

By adminPosted on January 26, 2023

Question : I’m trying to run some reporting queries on a MySQL database, and I’m running into serious performance issues […]

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