Hello.
Have a look here: http://dev.mysql.com/doc/mysql/en/memory-use.html Pete Harlan <[EMAIL PROTECTED]> wrote: > Hi, > > This formula shows up in a few places (this is from > <http://dev.mysql.com/books/hpmysql-excerpts/ch06.html>): > > min_memory_needed = global_buffers + (thread_buffers * max_connections) > > where thread_buffers includes the following: > > sort_buffer > myisam_sort_buffer > read_buffer > join_buffer > read_rnd_buffer > > My question is, once one of the buffers (e.g., sort_buffer) is needed > by a thread, does the thread hold onto it in case it needs it again, > or does the thread free it as soon as it can? I'm using 4.1.13. > > I'm trying to figure out an optimum value for max_connections. If the > threads don't release their memory, then I really do have to account > for the fact that each thread over time will probably be holding each > of those buffers. If threads give up the memory as soon as the, e.g., > sort, is finished, then I only have to figure out how many threads are > likely to need a sort_buffer at any given time. > > I looked through the manual, various online documentation, and the > source, but haven't been able to determine an answer. > > Thanks, > > -- > Pete Harlan > [EMAIL PROTECTED] > -- For technical support contracts, goto https://order.mysql.com/?ref=ensita This email is sponsored by Ensita.NET http://www.ensita.net/ __ ___ ___ ____ __ / |/ /_ __/ __/ __ \/ / Gleb Paharenko / /|_/ / // /\ \/ /_/ / /__ [EMAIL PROTECTED] /_/ /_/\_, /___/\___\_\___/ MySQL AB / Ensita.NET <___/ www.mysql.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
