現象
第一次執行ddl操作時由於oom導致中斷，再次執行這個ddl報錯
alter table `db_order4` add `tracknumber1` varchar(45) default null comment '內部單號' after `tracknumber`;
error 1050 (42s01): table 'mabang_order/#sql-ib9302' already exists
處理方法
1 create table tmp like table_name;
2 alter table tmp add `tracknumber1` varchar(45) default null comment '內部單號' after `tracknumber`;
3 cp tmp.frm "#sql-ib9302.frm"
4 改許可權為mysql chown mysql:mysql "#sql-ib8665.frm"
5 drop table `#mysql50##sql-ib9302`
6 檢查下主從狀態，跳過錯誤
7 再次執行alter table `db_order4` add `tracknumber1` varchar(45) default null comment '內部單號' after `tracknumber`;
故障原因
應該是ddl時由於db宕機等非正常關閉導致無法全部回滾，殘留了一些臨時檔案，具體是個什麼流程未知
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