Hi Dan, I am worried about Key_blocks_unused. when Key_blocks_unused reach to 0. There will be no free blocks then how insert query will work.
Thanks Krishna Chandra Prajapati On Wed, Apr 30, 2008 at 10:42 AM, Dan Nelson <[EMAIL PROTECTED]> wrote: > In the last episode (Apr 30), Krishna Chandra Prajapati said: > > Key_blocks_unused 952405 > > Key_blocks_used 395539 > > > > Key_blocks_used is increasing day by day and Key_blocks_unused is > > decreasing day by day. Ater a month Key_blocks_unused will reach to > > 0. Does it mean that i need to increase the key_buffer_size. Already > > key_buffer_size=1G. > > > > While going through forums and lists , i found that when > > key_blocks_unused is less. then select query will become slow. So > > whats the right solution. > > In a perfect world, you would set key_buffer_size to the total size of > all your .MYI files. Depending on the size of your tables, that may > simply not be possible. Luckily, it's usually not necessary, either. > What is more important is the hit rate. Run "SHOW STATUS LIKE 'key%'", > and compare Key_read_requests (how many times mysql asked for a key) > against Key_reads (how many times mysql actually had to go to disk to > fetch a key). 1-(Key_reads/Key_read_requests) is your read hit rate. > If it's 0.99 or greater, that means that 99% of your key reads are > already coming from the key buffer, and adding more key buffers is > unlikely to give you a measurable performance increase. > > Don't worry too much about your write hit rate ( > 1-(Key_writes/Key_write_requests) ); it's always going to be lower > because mysql tries to keep the on-disk copy of the index up to date. > > -- > Dan Nelson > [EMAIL PROTECTED] > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: > http://lists.mysql.com/[EMAIL PROTECTED] > > -- Krishna Chandra Prajapati
