[SOLVED] Reducing mysql .MYD and .MYI file size

divyashree · 12-31-2013, 01:55 AM

I have a .MYD file of 33GB in production.
I want to reduce its size.

Can I perform these below activities without any bad result:

1. Delete all rows created before certain date.(As we have backup and dont need much older data)

2. Run the optimize table command.

3. Run the analyze table command.

TB0ne · 01-01-2014, 11:39 AM

Quote:

Originally Posted by divyashree

I have a .MYD file of 33GB in production. I want to reduce its size.

Can I perform these below activities without any bad result:

1. Delete all rows created before certain date.(As we have backup and dont need much older data)
2. Run the optimize table command.
3. Run the analyze table command.

We have no way of knowing what deleting old data will do to your system. If you don't need it, it will obviously not hurt anything.
Read the MySQL documentation: http://dev.mysql.com/doc/refman/5.1/...ize-table.html
Read the MySQL documentation: http://dev.mysql.com/doc/refman/5.0/...yze-table.html

There are FAR too many variables for anyone to safely say if anything will be damaged. Make backups first, and get users off the database before performing any kind of maintenance. In other words, basic system administration practices.

Habitual · 01-01-2014, 06:42 PM

Quote:

Originally Posted by divyashree

I have a .MYD file of 33GB in production.
I want to reduce its size.

I wouldn't touch it with a barge pole.
Keyword: production

divyashree · 01-02-2014, 12:02 AM

Hi TBone and habitual. Thanks for the reply.

I was able to reduce the size with the same steps.

Here all SA practices are followed.

But the reason I asked it, as I found a lot of people in problem while running optimize with gigs of .MYD files.

Here in my case I was giving some MySQL optimization solutions to the admins of a client without my direct involvement. So was afraid a little if something might have happened.

Any way it worked fine without any issue but took long hours.

Habitual · 01-02-2014, 08:26 AM

Glad it worked out.