do_command函数是由线程中的循环调用的,主要可以分成两个部分,即首先从连接中读取命令,然后执行命令。 1. 读取命令 首先,设置vio读取的超时,即my_net_set_read_timeout,其中vio为Virtual I/O,主要为了封装linux和window不同的IO接口; 然后,调用Protocol_classic::get_command:分成两个内容,一个是从vio中读取命令...
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mysql_execute_command(sql_parse.cc:3438),mysql_parse(sql_parse.cc:5582),dispatch_command(sql_parse.cc:1458),do_command(sql_parse.cc:999),handle_connection(connection_handler_per_thread.cc:300), pfs_spawn_thread(pfs.cc:2190),start_thread(libpthread.so.0),clone(libc.so.6) #4. 等待获取...
do_command在sql/sql_parse.cc中。 bool do_command(THD *thd) { NET *net= &thd->net; packet_length= my_net_read(net); packet= (char*) net->read_pos; command= (enum enum_server_command) (uchar) packet[0]; // 解析客户端穿过来的命令类型 dispatch_command(command, thd, packet+1, (...
handle_one_connection MySQL的网络模型是one request one thread|-do_handle_one_connection|-do_command|-dispatch_command|-mysql_parse 解析SQL|-mysql_execute_command|-execute_sqlcom_select 执行select语句|-handle_select...一堆parse join 等的操作,当前并不关心|-*tab->read_record.read_record 读取记录...
为实现用户连接从 Per_thread 到 Thread_pool 的切换,需要在请求处理完(do_command)之后判断thread_handling是否发生了变化。 如需切换则立刻按照 2.2 中介绍的逻辑,通过thread_id % group_size选定目标 thread_group,将当前用户连接迁移至 Thread_pool 的目标 thread_group 中,后续该用户连接的所有网络事件统一交予...
6.执行语句 sql/sql_parse.cc - do_command函数 7.指令分发 sql/sql_parse.cc定义dispatch_command 8.sql/sql_parse.cc mysql_parse函数负责解析SQL 9.执行命令 mysql_execute_command 10.接下来sql/sql_insert.cc中mysql_insert函数 11.接着看真正写数据的函数write_record (在sql/sql_insert.cc),精简代码...
17. Top Command Counters 18. Top Command Counters Hourly 19. Mysql Handler 20. Mysql Transaction Handler 21. Process States 23. Mysql Query Cache Memory Free Memory Query Cache Size 26. Mysql Open Files Open Files Open Files Limit InnoDB Open Files ...
YesReplicate_Do_DB:Replicate_Ignore_DB:Replicate_Do_Table:Replicate_Ignore_Table:Replicate_Wild_Do_Table:Replicate_Wild_Ignore_Table:Last_Errno:0Last_Error:Skip_Counter:0Exec_Master_Log_Pos:638469Relay_Log_Space:4013168Until_Condition:NoneUntil_Log_File:Until_Log_Pos:0Master_SSL_Allowed:NoMaster_...
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