What is the Segmented Key Cache? (MySQL – MyISAM)

In this MySQL Server tutorial we’ll walk you through what is the MyISAM segmented key cache.
The MyISAM segmented key cache is the equivalent tto the MySQL Server InnoDB buffer pool equivalent in the mysql server myisam storage engine.
To segment the MyISAM key cache, use the “key_cache_segments” variable.
This MariaDB Server variable sets the number of segments for the key cache.
This variable was intended to eliminate thread contention. If the key cache is segmented, a key cache lock is acquired only for a specific segment.
If the MariaDB MyISAM key cache is segmented, database pages across the segments will be distributed evenly.
The idea of segmenting the key cache is to make threads not compete for the same cache lock.

Nowadays, this MySQL Server variale is usually forgotten about since the InnoDB storage engine is better than MyISAM in almost all applicable use cases.

Also, keep in mind that the background for this mysql tutorial was filmed in the beautiful island of Tenerife – have you been near the tenerife sea? Have you heard about the tenerife disaster or the so called tenerife airport disaster? Tell us in the comments below.

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