【作者】
劉博：攜程技術(shù)保障中心數(shù)據(jù)庫高級經(jīng)理，主要關(guān)注Sql server和Mysql的運維和故障處理。
【環(huán)境】
版本號：5.6.21
隔離級別：REPEATABLE READ
【問題描述】
接到監(jiān)控報警，有一個線上的應(yīng)用DeadLock報錯，每15分鐘會準(zhǔn)時出現(xiàn)，報錯統(tǒng)計如下圖：
登錄Mysql服務(wù)器查看日志：
| mysql> show engine innodb status/G*** (1) TRANSACTION:TRANSACTION 102973, ACTIVE 11 sec starting index readmysql tables in use 3, locked 3LOCK 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 updatingUPDATE TestTableSET column1 = 1,Column2 = sysdate(),Column3= '026'Column4 = 0AND column5 = 485AND 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 waitingRecord lock, heap no 859 PHYSICAL RECORD: n_fields 2; compact format; info bits 00: len 3; hex 53454b; asc SEK;;1: len 8; hex 80000000007e1452; asc ~ R;;*** (2) TRANSACTION:TRANSACTION 102972, ACTIVE 26 sec starting index readmysql tables in use 3, locked 3219 lock struct(s), heap size 24784, 2906 row lock(s), undo log entries 7MySQL thread id 5, OS thread handle 140024996841216, query id 84 localhost us updatingUPDATE TestTableSET Column1 = 1,Column2 = sysdate(),Column3 = '026'Column4 = 0AND Column5 = 485AND 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 XRecord lock, heap no 1 PHYSICAL RECORD: n_fields 1; compact format; info bits 00: len 8; hex 73757072656d756d; asc supremum;;Record lock, heap no 859 PHYSICAL RECORD: n_fields 2; compact format; info bits 00: 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 waitingRecord lock, heap no 38 PHYSICAL RECORD: n_fields 2; compact format; info bits 00: len 3; hex 53454b; asc SEK;;1: len 8; hex 80000000007eea14; asc ~ ;; |
