fil_init 主要是初始化文件打開指針哈希表，所有打開的文件全記錄在 fil_system 之中，構造按名字查找的哈希表
buf_pool_init 內存緩沖池的初始化，對應 buf_pool_ptr 數組之中，還初始化了 adaptive hash index 的內存
log_init 初始化log緩沖區，默認大小為 512*16k， 每個log頁面大小為 #define OS_FILE_LOG_BLOCK_SIZE 512 日志文件在創建過程中也是指定不用系統緩存
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lock_sys_create 初始化系統鎖，就是建了一個HASH表，lock_sys
recv_recovery_from_checkpoint_start 開始執行恢復
dict_boot 初始化表結構的緩存，dict_sys，建兩個hash表，可以根據表名和表ID查找；初始化系統表，就四個 SYS_TABLES SYS_COLUMNS SYS_INDEXES SYS_FIELDS ；初始化 insert buffer，每一個表空間對應一個；讀入上面四個系統表中的內容
trx_sys_init_at_db_start 初初化事務結構體 trx_sys ； Creates the global purge system control structure and inits the history
dict_create_or_check_foreign_constraint_tables 創建另外兩張系統表 SYS_FOREIGN SYS_FOREIGN_COLS www.2cto.com
啟動的線程，
IO部分共10個，可通過參數配置
1個 insert buffer thread
1個 log thread
4個 aio read thread
4個 aio write thread
1個 lock timeout thread A thread which wakes up threads whose lock wait may have lasted too long
1個 error monitor thread A thread which prints warnings about semaphore waits which have lasted too long
1個 monitor thread A thread which prints the info output by various InnoDB monitors
1個 master thread The master thread controlling the server
1個 thread handle shutdown
1個 handle connections socket 專門用來處理連理的
1個 trx_rollback_or_clean_all_recovered Rollback the uncommitted transactions which have no user session www.2cto.com
struct st_mysql_plugin *mysql_optional_plugins[]=
{
builtin_innobase_plugin, builtin_perfschema_plugin, builtin_partition_plugin, 0
};
struct st_mysql_plugin *mysql_mandatory_plugins[]=
{
builtin_binlog_plugin, builtin_mysql_password_plugin, builtin_csv_plugin, builtin_heap_plugin, builtin_myisam_plugin, builtin_myisammrg_plugin, 0
};
初始化的 binlog memory myisam innodb pefformance_schema partition
作者 spche
