• 这个功能帮助存储每个片段数据分布

    This feature helps you to store data distributions per fragment.

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  • 这种模式下不会生成数据分布

    In this mode, data distributions are not generated.

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  • Slice数据分布策略

    Data Distribution Policy in slice.

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  • 统计信息显示出中的数据分布状况

    The statistics show the data distribution within a table.

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  • 恰当分区可能导致数据分布不均匀

    An inappropriate partitioning key can cause uneven data distribution.

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  • 特定中的数据分布可能时间发生改变

    Data distribution in particular columns may change over time.

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  • 出现这类差异原因包括统计相关数据分布

    These differences can exist due to statistical correlation and data distribution, among other reasons.

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  • 数据分布策略控制由哪个存储持久化了实例

    Data Distribution Policy - Controls which slice stores a newly persisted instance.

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  • 优化可以使用数据分布计算查询过滤器选择率

    The optimizer can use data distributions to calculate selectivity for the filters in a query.

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  • 余下参数数据分布复制策略中的参数具有同样语义

    The rest of the parameters have the same semantics as in Data Distribution or Replication Policy.

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  • 收集数据分布统计信息然后再次生成访问计划

    Collect distribution statistics and then generate the access plan again.

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  • 应用程序就是通过数据分布策略指定实例相关联

    An application specifies the slice for a new instance via Data Distribution policy. This policy can be configured in persistence.xml as follows.

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  • 持久化一个类型复制过的实例会调用复制策略数据分布策略。

    Persisting an instance whose type is replicated invokes a Replication Policy instead of a Data Distribution Policy.

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  • 但是使用方式计算选择性不如使用数据分布计算的选择性准确

    But the selectivity calculated in this way is not as accurate as selectivity calculated using data distribution.

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  • 不过报表应用程序应该需要知道这种通过联合方法提供数据分布

    However, the reporting application should not need to be aware of this data distribution which can be provided through the federated approach.

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  • 实时系统(DDS)程序结构数据分布服务管理相互联系构件复杂性

    Architect Data Distribution Service for Real-Time Systems (DDS) applications to manage the complexity of interconnected components.

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  • 添加新的容器,将启动一个自动重新均衡操作以便数据分布所有容器上。

    When new containers are added, an automatic rebalancing starts to distribute the data across all containers.

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  • 传统缓存解决方案为了规避这些问题数据分布缓存节点组成的集群上。

    Traditionally, caching solutions have sought to avoid these issues by distributing the data over a cluster of caching nodes.

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  • 简单来说片段统计允许片段存储数据分布组成片段构建级别

    In simple terms, fragment-level statistics allows storage of column data distributions per fragment, and building the table level from its constituent fragments.

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  • 优化使用表大小索引可用以及数据分布信息确定响应查询最佳路径

    The optimizer USES information such as table sizes, availability of indexes, and data distribution to figure out the optimal way to answer the query.

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  • 假定正常数据分布开销评估可能并不能最好地反映查询使用不同参数实际开销。

    A cost estimation that assumes normal data distribution may not best reflect the real cost of a query when different parameters are used.

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  • 然而缺乏数据分布信息情况下优化器基于索引计算不同类型筛选器选择性

    However, in the absence of data distribution information, the optimizer will calculate selectivity for filters of different types based on table indexes.

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  • RUNSTATS收集两种类型数据分布统计信息:频率统计信息分位数统计信息。

    RUNSTATS collects two types of data distribution statistics: frequency statistics and quantile statistics.

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  • 但是如果没有数据分布数据服务器根据索引计算不同类型过滤器选择率。

    However, in the absence of data distributions, the database server calculates selectivity for filters of different types based on table indexes.

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  • 非常灵活,提供了各种knob调优参数可以修改数据分布工作负载构成等等

    It is flexible in that it provides various knobs and tuning parameters to modify the data distributions, workload composition, and so on.

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  • 是有意义的,因为存在很多重复或者数据分布不均匀情况下分布统计信息重要

    This makes sense because distribution statistics are important in the case of many duplicates or uneven distributed data.

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  • 只要数据分布上一次RUNSTATS以后没有改变,则优化器估计可能非常接近实际

    The optimizer's estimate could be very close to the actual value as long as the data distribution has not changed since the last RUNSTATS.

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  • 用户可以通过使用数据分区空间,来确定数据分布哪些数据分区上。

    Using database partition groups and tablespaces, a user can determine across which and how many database partitions their table data is to be spread.

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  • Jan提醒说这个技巧可以用来实现其他数据分布策略例如分片(Sharding)。

    Jan notes that the technique can also be used to implement other data distribution strategies, such as sharding.

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  • 并行计算要涉及到组合大量数据那些数据分布每个计算结点进行更快处理

    Parallel computing involves combining large amounts of data and spreading that data across each of the compute nodes for faster processing.

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