由logsec表示允许长期运行的事务。
对于长期运行的事务，常常需要创建容量更大的主日志。
For long-running transactions, often there is a need to create primary logs with bigger capacity.
所导致的工作单元(或者说事务)被称为长期运行的事务。
The resulting units of work or transactions are referred to as long running transactions.
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