This concurrency control can greatly reduce timeout situations between readers and writers accessing the same data row.
这种并发性控制可以极大地减少读取程序和写入程序访问相同的数据行时产生的超时情况。
DB2 services such as optimization, indexing, concurrency control, and utilities are extended to support XML data along with the relational data.
优化、编制索引、并行控制之类的DB 2服务和实用程序都可以进行扩展，以支持XML数据以及关系数据。
DB2 extends its common services, such as optimization, indexing, concurrency control, and utilities, across the traditional relational and XML column data.
DB 2对其涉及传统关系数据和xml列数据的常用服务进行了扩展，例如优化、索引、并行控制和实用工具。
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