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                ## 進程與進程關系查看 ``` pstree -p 8899 pstree -ap | grep name ps aft | grep http_server ``` ## mysql連接數 mysql查看當前鏈接數 show processlist mysql更改最大連接數 show variables like '%max_connections%' set GLOBAL max_connections = 200; 查看線程相關的狀態變量 mysql> SHOW STATUS LIKE 'Threads%'; +-------------------+-------+ | Variable_name | Value | +-------------------+-------+ | Threads_cached | 1 | | Threads_connected | 2 | | Threads_created | 3 | | Threads_running | 1 | +-------------------+-------+ 4 rows in set (0.01 sec) * `thread_cached` mysql管理的線程池中還有多少可以被復用的資源,當客戶端斷開之后,服務器處理此客戶的線程將會緩存起來以響應下一個客戶而不是銷毀(前提是緩存數未達上限)。 * `Threads_connected ` 當前打開的連接數, 相當于 `show processlist` * `thread_running` 真正在運行的當前并發數 * `thread_created` 新創建的thread(**根據官方文檔,如果thread\_created增大迅速,需要適當調高thread\_cache\_size**)。
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