工作许可证要突出工作的目的和种类。许可证申请人必须同样附上现场确认后的长期隔离表，修改清单，等等，以及所有必要文件，做好PTW申请前的准备工作。

PTW is raised stating the purpose and description of the tasks. The permit applicant must also attach LTIR, MC package, punch lists, LUN, and all other necessary documents.

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Percolator通过“ 快照隔离”实现了遵从ACID的跨行及跨表事务，从而满足多线程在多台服务器上对文档库进行转换操作的需求。

Percolator was designed to provide cross-row, cross-table ACID-compliant transactions via " snapshot isolation" since many threads on many machines need to transform the repository.

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例如，DB 2 Fundamentals考试测试考生的安全知识，表、索引和视图的创建和使用，SQL使用，以及隔离级别和锁定。

For example, the DB2 Fundamentals exam tests a candidate's knowledge of security; creating and working with tables, indexes, and views; using SQL; and isolation levels and locking.

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