事务日志被填满的原因是什么？
SQL Server事务日志可能会被填满，这会阻止之后的数据库操作，包括UPDATE， DELETE， INSERT 和CHECKPOINT。
事务日志填满会导致1105错误:
Can't allocate space for object syslogs in database dbname because
the logsegment is full。
If you ran out of space in syslogs， dump
the transaction log。
Otherwise use ALTER DATABASE or
sp_extendsegment to increase the size of the segment。
这种现象可能出现于任何一个数据库中，包括Master和TempDB。一些难以预见的因素可能消耗日志空间。
例如:
一个大型事务， 尤其像批量数据更新、插入或删除。
一个未提交的事务。
检查点处理程序截除时所需的带宽过大。
截除时超过阈值
上述各种条件互相作用的结果。
用于发布的标记事务没有被日志读取程序读走
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