联机备份时删除已归档日志是否会导致db挂起，收集latches如下：
Latches:Address Holder Waiter Filename LOC LatchType HoldCount 0x00002B1864000A20 22 0 Unknown 2042 SQLO_LT_sqlofmga_C__SQLO_TLFL_m_fileLatch 4 0x00002B188E3B88A8 27 0 Unknown 13692 SQLO_LT_SQLB_CLNR_PAUSE_CB__preventSuspendLatch 1 0x00002B2278000AC0 27 0 Unknown 2042 SQLO_LT_sqlofmga_C__SQLO_TLFL_m_fileLatch 2 0x00002B2294000A80 33 0 Unknown 2042 SQLO_LT_sqlofmga_C__SQLO_TLFL_m_fileLatch 2 0x00002B22980009C0 34 0 Unknown 2042 SQLO_LT_sqlofmga_C__SQLO_TLFL_m_fileLatch 2 0x0000000200480FE0 112 27 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 28 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 39 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 40 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 42 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 84 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 110 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 111 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 114 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 115 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 120 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 125 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 130 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 133 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 0x0000000200480FE0 112 207 Unknown 59 SQLO_LT_SQLE_KRCB__sqleDirCacheLatch 1 Latch Waiters With No Holders:Address Holder Waiter Filename LOC LatchType 0x00002B2278000A60 0 112 Unknown 2042 SQLO_LT_sqlofmga_C__SQLO_TLFL_m_fileLatch
联机备份的同时不要清理日志。干吗不多等一会呢？ 呵呵
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