简介:DDR的Controller、Channel、Chip、Rank、Bank、Row、Column、Sided 1.概览 先从半导体生产开始,生产出来还没切割的叫晶圆(wafer)。切割出来还没封装的叫裸die(bare die)。封装好的叫颗粒(component)。做成内存条后叫模组(module)。下文我们也会按这样的称呼去区分。 2.Controller(内存控制器) 一开始内存控制器...
读这篇论文最大的收获是首先知道了到底哪些因素促使Column-Store对分析类查询性能可以大幅优于Row-Store: 延迟物化、压缩、Invisible Join以及块遍历。 特别佩服这篇论文的是很多人稍微想一下就会觉得Column-Store在分析类场景下性能优于Row-Store是天经地义的: 更少的IO,但是这篇论文详细的对各种场景进行了测试、...
关于行式存储还是列式存储更适合于分析场景,本文在摘要部分就简明扼要的给出结论:列式存储(Column Stores)比行式存储(Row Stores)在性能上好过一个数量级!而这关键的原因就是:针对只读数据,I/O效率决定了这一切! 基于直观的认识,我们会认为在行式存储系统中,通过表结构垂直拆分(vertically partitioning)以及全列索...
In a row store, or row oriented database, the data is stored row by row, such that the first column of a row will be next to the last column of the previous row.For instance, let’s take this Facebook_Friends data:This data would be stored on a disk in a row oriented database...
修复方法: 1、第一点是确保单元格数量正确; 2、第二点是一个小细节,这里的c后面要加个"|": 代码语言:javascript 代码运行次数:0 运行 AI代码解释 \multicolumn{3}{c|} 当然,如果是左边少,那就加左边;或者直接左右都加最省事: 代码语言:javascript ...
Actual size vs. DesiredSize vs. Defined size ActualWidth is always 0 Add a button for each row in a listview Add a image to ComboBoxitem Add an empty item in a bounded-Combobox Add and remove event handlers dynamically in WPF Add Blank Row to DataGrid Add buttons to the tab control hea...
[System.ComponentModel.TypeConverter("System.Web.UI.Design.DataColumnSelectionConverter, System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a")] public virtual string RowHeaderColumn { get; set; } 属性值 String 用作列标题的列的名称。 默认值为空字符串 (""),表示尚未...
Basic Column, Row, and Cell Features in the Windows Forms DataGridView Control How to: Hide Columns in the Windows Forms DataGridView Control How to: Hide Column Headers in the Windows Forms DataGridView Control How to: Enable Column Reordering in the Windows Forms DataGridView Control How to:...
注解 包含行标题的行的列索引的值为 -1。 适用于 产品版本 .NET Framework 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9, 10 另请参阅 DataGridView RowIndex在...
AdvancedRowHeadersBorderStyle AllowUserToAddRows AllowUserToDeleteRows AllowUserToOrderColumns AllowUserToResizeColumns AllowUserToResizeRows AlternatingRowsDefaultCellStyle AutoGenerateColumns AutoSize AutoSizeColumnsMode AutoSizeRowsMode BackColor BackgroundColor BackgroundImage BackgroundImageLayout BorderStyle CanEnable...