求翻译：查询处理是并行数据库的核心技术之一，决定了并行数据库的性能。并行条件下的查询处理需考虑数据分布、节点负载和网络开销等因素，导致其代价估计模型、查询优化算法、执行计划调度策略和单点数据库都有很大差异。目前主流的并行数据库如TeraData、Aster Data和GreenPlum，为了保护其核心技术，内部的实现细节没有公开，著名的开源系统GridSQL及Postgres-XC也没有关于查询处理的技术资料。是什么意思？

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Parallel database query processing is one of the core technology, and determine the parallel performance of the database. Parallel query processing conditions needed to consider the distribution of your data, node and network overhead load factors such as cost estimates, and as a result, their model

Inquiry processing is one of parallel database core technologies, has decided the parallel database performance.Under parallel condition inquiry processing must consider factors and so on data distribution, node load and network expenses, cause its price to estimate the model, the inquiry optimizati

Query processing is one of the core technologies of parallel databases, determines the performance of parallel database. Parallel query processing under the conditions to be considered a data load distribution, node and network overhead and other factors, resulting in the cost estimation models, que

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