lock block

Temporal and spatial distribution model of displacement field for the temporary lock dam block 3 of the Three Gorges Project

三峡临时船闸3号坝段位移场时空分布模型

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When DB2 performs an index or table scan, DB2 will block on a row lock when it comes across an uncommitted row which another transaction has exclusively ( X) locked.

DB2在执行索引或表扫描时，如果遇到一个被另一个事务独占（X）锁定的未提交行，那么DB2将阻塞在行锁上。

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This is weaker than a pessimistic session lock& the convention adhered to by the participants is to warn, not to block.

它较悲观会话锁更弱一些，相关方约定发出警告，而不是阻止。

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In fact, when this feature is enabled, and the INSERT operation requires a new or reused block, DB2 will take an exclusive ( X) lock on the block in order to add it to the target cell.

实际上，当该特性被启用，并且INSERT操作要求一个新的或重用的块时，DB2将在块上采用一个独占的（X）锁，以便将它添加到目标单元。

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Synchronized methods and blocks allow a thread to lock an object on entry and unlock the object on exit ( to the method or block).

同步的方法和代码块允许线程在入口处锁定对象并在出口处解锁（针对方法或代码块）。

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However, this flexibility can lead to coding errors because a lock without a block is never automatically released.

然而，这种灵活性可能导致编码错误，因为不使用语句的锁是不会自动释放的。

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A wedge-shaped block used to lock type in a chase.

在美索不达米亚和波斯使用的一种古代楔形手稿.

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