今天，某個環境又發生了死鎖，如下：

*** (1) TRANSACTION:

TRANSACTION 735307073, ACTIVE 0 sec inserting

mysql tables in use 1, locked 1

LOCK WAIT 6 lock struct(s), heap size 1184, 3 row lock(s), undo log entries 1

MySQL thread id 2754, OS thread handle 0x7f29cd89a700, query id 751744317 127.0.0.1 osm update

insert into tb_trd_secu_command(

machine_date, company_no, product_id,

product_code, product_name, unit_id, unit_code,

unit_name, asset_account, stock_account, command_operator,

command_executor, command_date, command_time, command_id,

batch_no, exchange_no, asset_type, stock_type,

stock_code, stock_name, currency_type, command_dir,

limit_price, command_qty, command_amt, order_qty,

cancel_qty, command_status, execution_status, execution_amt,

execution_qty, frozen_amt)

value(

v_machine_date, v_company_no, v_product_id,

v_product_code, v_product_name, v_unit_id, v_unit_code,

v_unit_name, v_asset_account, v_stock_account, v_command_operator,

v_command_executor, v_command_date, v_command_time, v_command_id,

v_batch_no, v_exchange_no, v_asset_type, v_stock_type,

*** (1) WAITING FOR THIS LOCK TO BE GRANTED:

RECORD LOCKS space id 10538 page no 4 n bits 296 index `idx_tb_trd_secu_command_1` of table `db_trd`.`tb_trd_secu_command` trx id 735307073 lock_mode X locks gap before rec insert intention waiting

*** (2) TRANSACTION:

TRANSACTION 735307149, ACTIVE 0 sec inserting, thread declared inside InnoDB 1

mysql tables in use 1, locked 1

4 lock struct(s), heap size 1184, 2 row lock(s), undo log entries 1

MySQL thread id 2744, OS thread handle 0x7f29cd8db700, query id 751750715 127.0.0.1 osm update

insert into tb_trd_secu_command(

machine_date, company_no, product_id,

product_code, product_name, unit_id, unit_code,

unit_name, asset_account, stock_account, command_operator,

command_executor, command_date, command_time, command_id,

batch_no, exchange_no, asset_type, stock_type,

stock_code, stock_name, currency_type, command_dir,

limit_price, command_qty, command_amt, order_qty,

cancel_qty, command_status, execution_status, execution_amt,

execution_qty, frozen_amt)

value(

v_machine_date, v_company_no, v_product_id,

v_product_code, v_product_name, v_unit_id, v_unit_code,

v_unit_name, v_asset_account, v_stock_account, v_command_operator,

v_command_executor, v_command_date, v_command_time, v_command_id,

v_batch_no, v_exchange_no, v_asset_type, v_stock_type,

*** (2) HOLDS THE LOCK(S):

RECORD LOCKS space id 10538 page no 4 n bits 296 index `idx_tb_trd_secu_command_1` of table `db_trd`.`tb_trd_secu_command` trx id 735307149 lock mode S locks gap before rec

*** (2) WAITING FOR THIS LOCK TO BE GRANTED:

RECORD LOCKS space id 10538 page no 4 n bits 296 index `idx_tb_trd_secu_command_1` of table `db_trd`.`tb_trd_secu_command` trx id 735307149 lock_mode X locks gap before rec insert intention waiting

*** WE ROLL BACK TRANSACTION (2)

其中idx_tb_trd_secu_command_1是唯一索引。

看了下參數，當前隔離級別是read-committed，不過參數innodb_locks_unsafe_for_binlog是默認值OFF。

又仔細看了下官方文檔，?innodb_locks_unsafe_for_binlog和read-committed一方面是一樣的，啟用后，可以使得InnoDB?gap鎖最小化，但是在兩種場景(外鍵約束和唯一索引)中，仍然不可避免的存在gap鎖。

不管事務管理級別如何設置，只要存在唯一性約束并且可能insert/delete/update同一key值的記錄，死鎖都將無法100%的避免，只能是概率降低。

原文：http://www.cnblogs.com/zhjh256/p/6051839.html

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