mysql 常用sql脚本

# 查看事物隔离级别
select @@tx_isolation;

# 设置全局隔离级别

set global transaction isolation level REPEATABLE READ;
set global transaction isolation level  READ COMMITTED;
set global transaction isolation level READ UNCOMMITTED;
set global transaction isolation level SERIALIZABLE;

#设置会话隔离级别 

set session transaction isolation level REPEATABLE READ;
set session transaction isolation level READ COMMITTED;
set session transaction isolation level READ UNCOMMITTED;
set session transaction isolation level SERIALIZABLE;

#开启事物
 start transaction 

　select * from a where id=1 lock in share mode

  commit;
  rollback;

#自动提交

show variables like 'AUTOCOMMIT';
set autocommit = 0;

#设置锁
select * from a where id=1 lock in share mode
select * from a where id=1 for update

#查看正在执行的事物
SELECT * FROM information_schema.INNODB_TRX