MySQL Forums
Forum List  »  InnoDB

Re: Index exist on Deleted columns
Posted by: Peter Brawley
Date: September 22, 2017 09:04AM

You have just 8 GB RAM, but with these settings MySQL can use up to 5105.5 GB of RAM!

On an even moderately busy system like yours, that will cause swapping, which kills performance.

(The formula for max memory use by MySQL is is innodb_buffer_pool_size + key_buffer_size + ((read_buffer_size + read_rnd_buffer_size + sort_buffer_size + join_buffer_size) X max_connections) ).

Innodb_buffer_pool_size should be no higher than about 75% of RAM depending on other memory uses. Your setting of 23GB is nearly 300% of RAM! Why?

Options: ReplyQuote


Subject
Views
Written By
Posted
308
September 19, 2017 09:38AM
168
September 19, 2017 01:36PM
142
September 20, 2017 12:54AM
161
September 20, 2017 10:19AM
175
September 21, 2017 04:21AM
154
September 21, 2017 09:27AM
169
September 22, 2017 05:12AM
Re: Index exist on Deleted columns
170
September 22, 2017 09:04AM
162
September 24, 2017 07:14AM
157
September 24, 2017 11:13AM
146
September 24, 2017 09:29PM
144
September 24, 2017 09:55PM
153
September 25, 2017 12:25AM
153
September 25, 2017 11:03AM
145
September 26, 2017 05:30AM
162
September 26, 2017 12:12PM


Sorry, you can't reply to this topic. It has been closed.

Content reproduced on this site is the property of the respective copyright holders. It is not reviewed in advance by Oracle and does not necessarily represent the opinion of Oracle or any other party.