SQL SERVER Always On日志文件收缩的详细操作步骤及问题解决方案（已实际验证并成功通过）

1.SQL SERVER Always On收缩日志文件详细操作； 2.针对收缩日志出现“cannot be shrunk until all secondaries have moved past the point where the log was added ”问题的分析及解决方法；