1、參數設置
(root:zw_75.58:Thu Nov 25 11:41:12 2010)[test]> show variables like 'thread%';
+----------------------------+---------------------------+
| Variable_name | Value |
+----------------------------+---------------------------+
| thread_cache_size | 8 |
| thread_handling | one-thread-per-connection |
| thread_stack | 196608 |
+----------------------------+---------------------------+
thread_cache_size：設置線程緩沖池中緩存線程的個數，對比Threads_created和Connections值thread_cache_size是否合理。
By examining the difference between the Connections and Threads_created status variables, you can see how efficIEnt the thread cache is.
thread_stack：每一個線程分配的內存大小。
the thread stack is too small, this limits the complexity of the SQL statements which the server can handle, the recursion depth of stored procedures, and other memory-consuming actions. To set a stack size of N bytes for each thread, start the server with --thread_stack=N.
thread_handling：線程分配方式，主要有兩種：一種是one-thread-per-connection每一個連接對應於一個線程；一種是no-threads服務器只使用一個連接。
2、線程監控信息
(root:zw_75.58:Thu Nov 25 11:41:22 2010)[test]> show global status like 'thread%';
+------------------------+-------+
| Variable_name | Value |
+------------------------+-------+
| Threads_cached | 1 |
| Threads_connected | 2 |
| Threads_created | 3 |
| Threads_running | 1 |
+------------------------+-------+
Threads_cached：當前線程緩沖池中緩存線程數。
Threads_connected：當前連接服務器的線程數。
Threads_created：為處理客戶端連接而創建線程數。The number of threads created to handle connections. If Threads_created is big, you may want to increase the thread_cache_size value.
The cache miss rate can be calculated as Threads_created/Connections.
Threads_running：狀態處於非sleep狀態的線程數。
