... 1、垃圾收集线程（garbage collection thread） 2、事务清扫线程（sweep thread） 3、文件格式变化（file format change） ...
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An exception is thrown on the garbage collection thread when you use SQL providers.
使用SQL provider时，垃圾回收线程抛出异常。
If the NHRT is delayed when trying to acquire such a lock while the thread owning the lock is delayed by garbage collection, then the NHRT is indirectly delayed by garbage collection as well.
如果NHRT在尝试获取这类锁时被延迟了，而且拥有该锁的线程被垃圾收集延迟了，那么垃圾收集也会间接地延迟NHRT。
That is, do not hold a lock if the owning thread might make a call that triggers a garbage collection.
也就是说，如果拥有的线程可能进行触发垃圾回收的调用，请不要持有锁。
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