how to calculate key_buffer_size from current Indexes

Jason M Potter answered on October 15, 2022 Popularity 8/10 Helpfulness 2/10

answer how to calculate key_buffer_size from current Indexes

how to calculate key_buffer_size from current Indexes

Comment

## Script to read index sizes and calculate key buffer size
mysql -e "set @overhead = 5 / 100;
        select count(INDEX_LENGTH) as Indexes,
        sum(INDEX_LENGTH) as Total_Index_Length,
        floor(@overhead * 100) as PCT,
        floor(sum(INDEX_LENGTH)*@overhead) as Overhead,
        floor(sum(INDEX_LENGTH)*(1+@overhead)) as key_buffer_size
        FROM information_schema.TABLES WHERE ENGINE = 'MyISAM';"
## Example Output:
+---------+--------------------+------+----------+-----------------+
| Indexes | Total_Index_Length |  PCT | Overhead | key_buffer_size |
+---------+--------------------+------+----------+-----------------+
|     744 |            5775360 |    5 |   288768 |         6064128 |
+---------+--------------------+------+----------+-----------------+

Popularity 8/10 Helpfulness 2/10 Language sql

Source: www.liquidweb.com

Tags: buffer figure key mysql size sql

Link to this answer
Share Copy Link