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19 mar 2015 · The key buffer is MyISAM specific, a structure for index blocks that contains a number of block buffers where the most-used index blocks are placed. It's mean for minimizing disk I/O, because memory is still faster than hard drives [currently].
1 maj 2023 · After vagrant up, all I do is apt update && upgrade then sudo apt install mysql-server. The installation it's getting stuck at "Renaming removed key_buffer and myisam-recover options (if present)".
The key_buffer_size variable, also called the key cache, sets the buffer size for index blocks. Releem automatically tunes key_buffer_size and 44 other variables to improve MySQL performance. Try Releem for Free, or deepen your understanding by reading our detailed article.
key_buffer_size is a buffer used for MyISAM table index caching. Since you have a 75G buffer pool, you can leave all MyISAM related settings in their default settings. You also seem to have 4G of RAM free. Let's look into this section of your Stack Trace
9 mar 2015 · mysql> SELECT LOWER(variable_name) as variable, variable_value/1024/1024 as MB FROM information_schema.global_variables WHERE variable_name = 'key_buffer_size'; +-----+-----+ | variable | MB | +-----+-----+ | key_buffer_size | 16 | +-----+-----+ 1 row in set (0.00 sec)
A key cache can be restructured at any time by updating its parameter values. For example: mysql> SET GLOBAL cold_cache.key_buffer_size=4*1024*1024;
For index blocks, a special structure called the key cache (or key buffer) is maintained. The structure contains a number of block buffers where the most-used index blocks are placed. For data blocks, MySQL uses no special cache. Instead it relies on the native operating system file system cache.
