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In this article, I am going to talk about building a RAM disk on the fly, and telling My SQL to use it.

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I came across this tidbit: If you are running Ubuntu, then you already have perfectly usable, mounted, ramdisk location that can store files up to half the size of your total installed ram.

This should be plenty for My SQL so I am not going to go into more detail on how to manually create a RAMdisk in linux as this isn’t necessary on any modern version of Ubuntu (which is my OS of choice…) Run the following command and you can see how much storage space you have mounted at /run/shm You should see a folder mounted at /run/shm that is approximately half the size of your installed ram.

We are going to put a command in our /etc/rc.local file to create a sub-directory here every time ubuntu boots. Luckily My SQL logs quite well so I checked the /var/log/mysql/file.

Simply put, you carve out a piece of your system’s RAM and use it as a normal file system. These files are built on the fly to store some temporary data (perhaps a specific view of the database as requested by a website page). rather than taking the CPU through the task of building as special table from existing tables again and again, it caches the special table so it can serve it the next time it is requested.

Think of them like a scratch-pad you would use when doing a long equation in Algebra class.

So if you do a system reboot, or lose power, everything stored on your RAM disk, even the RAM disk itself, is completely lost. These are usually pretty small files that are built on the fly for normal operations.

Second, and perhaps more critical, RAM is erased whenever power is lost. Some applications, like My SQL for example, write “temporary” files to disk.

So if you have an application that would benefit from being able to access data very quickly, a RAM disk makes a lot of sense. why don’t I just load everything into a RAM disk all the time? So your system probably has a fairly limited amount to work with.

RAM is expensive and therefore quite scarce compared with conventional hard drive space.

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