oracle dead lock
2017-04-10 14:28
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死锁的其中一个原因是互相占用已有的资源。
首先,左边执行update hr.departments set department_name='deptname';然后右边执行update hr.employees set last_name='king';
这就是各自占用一个资源
然后,左边执行update hr.employees set last_name='king';然后右边执行update hr.departments set department_name='deptname';
然后稍等一会,
查看trace
首先,左边执行update hr.departments set department_name='deptname';然后右边执行update hr.employees set last_name='king';
这就是各自占用一个资源
然后,左边执行update hr.employees set last_name='king';然后右边执行update hr.departments set department_name='deptname';
然后稍等一会,
查看trace
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