Key_buffer_size

MyISAM variable which determines the size of the index buffers held in memory, which affects the speed of index reads. I have node and database has InnoDB tables. My innodb_buffer_pool_size is 75G and innodb_log_buffer_size = 256M.

MySQL: Is it safe to set. When I try to change the key_ buffer _size to 4GB, it doesnt get effective.

I am not sure why it doesnt get changed. You should first feel confident that you have these set appropriately before trying to change any other variables. The maximum permissible setting for key_ buffer _size is 4GB−on 32-bit platforms. Larger values are permitted for 64-bit platforms. Plus key_buffer_size = 10M, small, but not zero.

Rule of thumb for tuning: Start with released copy of my. Change key_buffer_size and innodb_buffer_pool_size according to engine usage and RAM.

Increase this to get better index handling (for all reads and multiple writes) to as much as you can afford. See also: System Variables in 10. What is the corresponding setting for Inn.

Mysql buffers key_blocks uses a LRU algorithm to determine what to buffer. MyISAM is the only storage engine that uses the key buffer. Hi, According to the mysql manual, I changed key_buffer_size from 8M to 512M. But In mysql administrator, key buffer hitrate seems stay unchanged.

And key buffer usage always below 4M. The total db size is about 200M. And the hitrate is about 1 intermittently. K I dont know what the units mean, or how different they are in size. Changed queue handling to use standard functions.

After I lowered the key_buffer_size , the Write buffer key hit rate improved directly. Please note that these are house rules. There is no guarantee that your performance will improve.

Use with precautions!

As far as benchmarks are concerne it really depends on the following parameters (in no particular order): 1. How your data is indexed and queried. This value is in kilobytes or bytes? The speed of your file system.

As you can see look really strange. Performance indeed grows by a few percent as you increase the buffer to 128K but after that instead of improving any further, it drops down sharply being slower at the 2MB size. INPUT_RECORD structure.

Describes an input event in the console input buffer. These records can be read from the input buffer by using the ReadConsoleInput or PeekConsoleInput function, or written to the input buffer by using the WriteConsoleInput function.