管理类(Administrative)：由管理命令引起，如重建索引，行级锁(row-level locking)引起的锁等待; 应用程序类(Application): APP代码引起；
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闩锁首次在SQL Server 7.0里引入，同时微软首次引入了行级别锁（row-level locking）。对于行级别锁引入闩锁的概念是非常重要的，不然的话在内存中会出现丢失更新（Lost Updates）的现象。
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locking on row level 提供行锁
The first thing every contestant needed to do was change every table to row-level locking.
每位参赛者需要做的第一件事是将每个表更改为行级别锁定。
During an export operation, row-level locking is applied to the exporting table, which means that only one lock is held at a time.
在导出操作期间，行级别锁定应用于导出表(exporting table)，这意味着一次只持有一个锁。
WebSphere Process Server accesses its databases in multiple concurrent threads and USES row-level locking to ensure data consistency during its transactions.
WebSphere Process Server通过多个并发线程访问其数据库，并使用行级锁定来确保其事务期间的数据一致性。
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