導讀:1建站知識【作者】 劉博：攜程技術保障中心數據庫高級經理，主要關注Sql server和Mysql的運維和故障處理。 【環境】 版本號：5.6.21 隔離級別：REPEA網站建設哪家好網seo優化趨勢。

【作者】

劉博：攜程技術保障中心數據庫高級經理，主要關注Sql server和Mysql的運維和故障處理。

【環境】

版本號：5.6.21

隔離級別：REPEATABLE READ

【問題描述】

接到監控報警，有一個線上的應用DeadLock報錯，每15分鐘會準時出現，報錯統計如下圖：

登錄Mysql服務器查看日志：

mysql> show engine innodb status\G *** (1) TRANSACTION: TRANSACTION 102973, ACTIVE 11 sec starting index read mysql tables in use 3, locked 3 LOCK WAIT 4 lock struct(s), heap size 1136, 3 row lock(s) MySQL thread id 6, OS thread handle 140024996574976, query id 83 localhost us updating UPDATE TestTable SET column1 = 1, Column2 = sysdate(), Column3= '026' Column4 = 0 AND column5 = 485 AND column6 = 'SEK' *** (1) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 417 page no 1493 n bits 1000 index idx_column6 of table test.TestTable trx id 102973 lock_mode X waiting Record lock, heap no 859 PHYSICAL RECORD: n_fields 2; compact format; info bits 0 0: len 3; hex 53454b; asc SEK;; 1: len 8; hex 80000000007e1452; asc ~ R;; *** (2) TRANSACTION: TRANSACTION 102972, ACTIVE 26 sec starting index read mysql tables in use 3, locked 3 219 lock struct(s), heap size 24784, 2906 row lock(s), undo log entries 7 MySQL thread id 5, OS thread handle 140024996841216, query id 84 localhost us updating UPDATE TestTable SET Column1 = 1, Column2 = sysdate(), Column3 = '026' Column4 = 0 AND Column5 = 485 AND Column6 = 'SEK' *** (2) HOLDS THE LOCK(S): RECORD LOCKS space id 417 page no 1493 n bits 1000 index idx_Column6 of table test.TestTable trx id 102972 lock_mode X Record lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 0 0: len 8; hex 73757072656d756d; asc supremum;; Record lock, heap no 859 PHYSICAL RECORD: n_fields 2; compact format; info bits 0 0: len 3; hex 53454b; asc SEK;; 1: len 8; hex 80000000007e1452; asc ~ R;; *** (2) WAITING FOR THIS LOCK TO BE GRANTED: RECORD LOCKS space id 601 page no 89642 n bits 1000 index idx_column6 of table test.TestTable trx id 32231892482 lock_mode X locks rec but not gap waiting Record lock, heap no 38 PHYSICAL RECORD: n_fields 2; compact format; info bits 0 0: len 3; hex 53454b; asc SEK;; 1: len 8; hex 80000000007eea14; asc ~ ;;

大致一看，更新同一索引的同一行，應該是一個Block，報TimeOut的錯才對，怎么會報DeadLock?

【初步分析】

先分析下(2) TRANSACTION，TRANSACTION 32231892482。

等待的鎖信息為：

0: len 3; hex 53454b; asc SEK;; 1: len 8; hex 80000000007eea14; asc

關鍵詞標簽: SQL 故障 全過程