MySQL repair with keycache comes in handy during certain scenarios. Read on to find out more from our experts. 

At Bobcares, we offer solutions for every query, big and small, as a part of our MySQL Support Services.

Let’s take a look at how our MySQL Support Team is ready to help customers understand more about repair with keycache.

What is MySQL repair with keycache

Did you know we have a choice of two different methods to create indexes for MyISAM tables?

• Repair with keycache
• Repair by sorting

However, MySQL decided which method to pick depending on a few parameters. Furthermore, we can view which method is in use with the help of the SHOW PROCESSLIST statement during the operation.

Additionally, the optimizations occur during the following operations:

• REPAIR TABLE
• ALTER TABLE
• OPTIMIZE TABLE
• LOAD DATA INFILE

One of the methods in use by MySQL is repair with keycache. In fact, this is used by default by MySQL. Moreover, we need it when working with PRIMARY or UNIQUE KEY as MySQL has to verify the data is UNIQUE.

MySQL repair with keycache works by using the key_buffer to generate indexes. This is why we have to keep the key_buffer variable as large as possible when the operation is running. Additionally, it works even if the system is low on resources compared to repair by sorting method.

Since the repair with keycache method is comparatively slower, we should use it only when required. For instance, while dealing with a PRIMARY or UNIQUE key.

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Conclusion

In a nutshell, our skilled MySQL Support Engineers at Bobcares helped us understand more about MySQL repair with keycache.