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I have two databases one of size 170 MB and second one is of 15 MB, both having INNODB tables and innodb_buffer_pool_size is set to 8 MB.

My queries are responding well now i.e under mili seconds. Is there any impact on performance if I set innodb_buffer_pool_size more than the default?

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Yes there is impacts(better performance), you should set your innodb_buffer_pool_size to 70-80% on a dedicated machine.

I would indicate this post it will be a good start to choose the right size of your innodb_buffer_pool_size

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If you want to size the innodb_buffer_pool_size bigger please run this:

SELECT CEILING(SUM(data_length+index_length)/POWER(1024,2)) RIBPS
FROM information_schema.tables WHERE engine='InnoDB';

This will give you the maximum amount of InnoDB Buffer Pool needed for your current data set.

Given the amount of data and index pages for your dataset, having 8MB Buffer Pool will just cause data and index pages accessed to rotate out and load new pages as needed. Setting it with the value based on that RIBPS query (RIBPS stands for Recommended InnoDB Buffer Pool Size), all of InnoDB will be accessed from RAM. Having the Buffer Pool too big would just wastes RAM.

Let's say that you ran this query and got the following:

mysql> SELECT CEILING(SUM(data_length+index_length)/POWER(1024,2)) RIBPS
    -> FROM information_schema.tables WHERE engine='InnoDB';
|  1493 |

Take that number and place it in /etc/my.cnf


and restart mysql.

I have discussed this before

Give it a Try !!!

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