• 本文提出了输入-多输出系统动态载荷优化估计方法

    An optimal method is developed to estimate the dynamic loads for systems subjected to multiple inputs.

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  • 采用加权均方误差准则优化估计模型参数,实现测量序列抗扰最佳估计

    To obtain the best estimation of anti-jamming for measured series, the rule of weighted-square error is introduced to optimize the parameters of estimating model.

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  • 利用码间串度量准则,对不同成形滤波函数研究了插值滤波器参数优化估计及其时钟抖动性能

    By using the measure criterion of intersymbol interference, the parameter optimization and robustness of timing jitter of interpolation filter for a few kinds of shaping functions has been studied.

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  • 已经一个较好的因为可以保证优化使用位数统计信息情况下确定过滤因子估计误差最大只有5%。

    This is already a good value because it guarantees that the optimizer, by using the quantile statistics, only has an estimated maximum error of 5% for the determined filter factors.

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  • 因此如果优化估计准确的,则访问路径应该一个非常有效的访问路径。

    Therefore, if the optimizer's estimate is accurate, this access path should be a very efficient access path.

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  • 每一个节点显示数字都是优化对基础数据源操作节点基数估计

    The number shown in each node is the optimizer's estimate for the cardinality of the underlying data source or operation node.

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  • 查询优化根据每个检索估计查询成本。

    The query optimizer bases query-cost estimates on the number of rows to be retrieved from each table.

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  • 查询性能出现例外情况时,优化指南统计视图特性对于弥补访问计划估计的不准确性非常有用。

    Optimization guidelines and statistical views are useful features to compensate the access plan evaluations when exceptions in query performance occur.

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  • 优化估计的总行 2.176。

    The total number of rows, estimated by the optimizer, is 2.176.

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  • 新的优化框架,4.1发行版系列引入了大量优化例如改进的概要分析(profiling)支持准确分支可能性估计

    With the new optimization framework in place, the 4.1 release series introduced a larger number of optimizations, such as improved profiling support and more accurate branch probability estimation.

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  • 基于优化估计,在目标索引范围内有8个合格的RID。

    Based on the optimizer's estimate, there are eight qualifying RIDs within the target index key range.

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  • 开始这个实验,解释应用各种优化Hotspot的有效性时候,我估计花费几个小时时间最终这会丰富我的blog的内容。

    When I first started this exercise to examine the effectiveness of Hotspot applied lock optimizations, I figured it would take a couple hours of my time and in the end I've have a useful blog entry.

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  • 对于访问计划每个操作优化估计操作符的基数输出

    At each operator in the access plan, the optimizer estimates the cardinality output from the operator.

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  • 基数估计这样一种过程应用了谓词执行了聚集之后优化使用统计信息确定部分查询结果大小

    Cardinality estimation is a process by which the optimizer USES statistics to determine the size of partial query results after predicates are applied or aggregation is performed.

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  • 然后这些信息包括进来,用于帮助优化那些符合条件查询(这些查询需要直接引用视图)的选择性估计基数估计计算成本做决定

    This information can then be included as part of the optimizer decision during costing for selectivity and cardinality estimates for qualified queries which do not need to reference the view directly.

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  • 优化器凭借精确基数估计准确计算出每一个待定查询访问计划成本

    The optimizer is dependent on accurate cardinality estimates to properly compute the cost of each query access plan considered.

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  • 可以利用DB2 9.5 中的多统计信息扩展用途优化提供更多信息从而使优化更好地估计基数选择最佳查询访问计划

    You can leverage the extended use of multi-column statistics in DB2 9.5 to provide the optimizer more information to better estimate the cardinality in order to choose an optimal query access plan.

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  • 这个示例解释说明了部分统计信息对于优化估计基数能力影响

    This example illustrates the effect that partial statistics have on the ability of the optimizer to estimate the cardinality.

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  • 优化凭借精确基数估计准确计算出每一个待定查询访问计划成本

    The optimizer depends on accurate cardinality estimates to properly compute the cost of each query access plan considered.

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  • 统计视图REOPT使优化可以计算精确基数估计而后选择一个最佳查询执行计划

    Both statistical views and REOPT allow the optimizer to compute a more accurate cardinality estimate and consequently choose an optimal query execution plan.

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  • 每个断言筛选因子表示优化估计符合断言数据比例

    The Filter factor for each predicate indicates the proportion of data the optimizer estimates will satisfy the predicate.

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  • 然后优化可以输入变量编目统计进行比较谓词计算出一个更好选择估计

    The optimizer can then compare the input variable values to catalog statistics and compute a better selectivity estimate for predicates.

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  • 生成访问计划查看优化查询返回基数()估计

    Generate the access plan and see what the optimizer estimates the total cardinality (Number of rows) returned by the query will be.

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  • 优化将选择查询计划因为执行估算成本所有估计中最低的。

    The optimizer chose this query plan because the estimated cost for its execution was the lowest among all the evaluated plans.

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  • 优化使用数据模型估计可以用于解决某个特定查询其它存取路径成本

    This data model is used by the optimizer to estimate the costs of alternative access paths that can be used to resolve a particular query.

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  • 优化根据可用统计信息计算基数估计预计查询返回行数

    The optimizer calculates its cardinality estimatethat is, the estimated number of rows returned by the querybased on the statistics available.

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  • 话说,优化过高估计本地谓词表格选择性

    In other words, the optimizer overestimated the selectivity of the local predicates on the table.

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  • 只要数据分布上一次RUNSTATS以后没有改变,则优化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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  • 实际上通过基本统计信息DB 2优化只能估计' VALUE_Z 'COLUMN_Y中出现频率

    Indeed, from the basic statistics, the DB2 optimizer can only estimate the frequency of 'VALUE_Z' in COLUMN_Y.

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  • 如果有了准确统计信息那么查询优化一般能够得出正确选择性估计

    Given accurate statistics, the query optimizer generally comes up with correct selectivity estimates.

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