Data Quality Issue |
Description |
Completeness |
Is all the required information available? Are data values missing, or in an unusable state? In some cases, missing data is irrelevant, but when the information that is missing is critical to a specific business process, completeness becomes an issue.
Example: if you have an email field where only 50,000 values are present out of a total of 75,000 records, then the email field is 66.6% complete. |
Conformity |
Are there expectations that data values conform to specified formats? If so, do all the values conform to these formats? Maintaining conformance to specific formats is important in data representation, presentation, aggregate reporting, search, and establishing
key relationships.
Example: The Gender codes in two different systems are represented differently; in one system the codes are defined as ‘M’, ‘F’ and ‘U’ whereas in the second system they appear as 0, 1, and 2. |
Consistency |
Do values represent the same meaning?
Example: Is revenue always presented in Dollars or also in Euro? |
Accuracy |
Do data objects accurately represent the “real-world” values they are expected to model? Incorrect spellings of product or person names, addresses, and even untimely or not current data can impact operational and analytical applications.
Example: A customer’s address is a valid USPS address. However, the ZIP code is incorrect and the customer name contains a spelling mistake. |
Validity |
Do data values fall within acceptable ranges?
Example: Salary values should be between 60,000 and 120,000 for position levels 51 and 52. |
Duplication |
Are there multiple, unnecessary representations of the same data objects within your data set? The inability to maintain a single representation for each entity across your systems poses numerous vulnerabilities and risks. Duplicates are measured as a percentage
of the overall number of records. There can be duplicate individuals, companies, addresses, product lines, invoices and so on. The following example depicts duplicate records existing in a data set:
Name |
Address |
Postal Code |
City |
State |
Mag. Smith |
545 S Valley View D. # 136 |
34563 |
<Anytown> |
New York |
Margaret smith |
545 Valley View ave unit 136 |
34563-2341 |
<Anytown> |
New-York |
Maggie Smith |
545 S Valley View Dr |
|
<Anytown> |
NY.
|
|
相关推荐
通过文章来把这些DDR关键技术再给大家介绍一下。
How DQS works in DDR-III memory system
行业-电子政务-用于DQS自动门控的电路和方法.zip
在allegro上-12.5mmCLK-DQS140mm这个等长误差应怎么设置
write leveling是DDR controller采用的一种补偿fly-by PCB layout topology引入的DQS与CLK之间存在的flight time skew的机制.
altera ip altera ip altera ip
DDR3的设计有着严格等长要求,归结起来分为两类(以64位的DDR3为例): 数据 (DQ,DQS,DQM):组内等长,误差控制在20MIL以内,组间不需要考虑等长;地址、控制、时钟信号:地址、控制信号以时钟作参考,误差控制在...
实际设计中,为了保证信号有足够的保持时间,或减小同组信号之间的时间偏移,往往不得不故意进行绕线,例如 DDR*(DDR1/DDR2/DDR3)中的 DQS 与 DQ 信号组要求要严格等长以降低 PCB skew,这时就要用到蛇形线。
aaaaaaaaaaaaaaaaaDDR2 DDR2 dd = +1.8V ±0.1V, VddQ = +1.8V ±0.1V ...• WRITE latency = READ latency - 1 t CK • Selectable burst lengths (BL): 4 or 8 • Adjustable data-output drive st
DQ bits per DQS bit:将DQ进行分组,每8个一组被1个DQS驱动,所以设为8。32位的接口就有4组。 Precharge address bit:查阅DDR2 SDRAM的书册,在对某一个bank或所有bank进行Precharge的时候,有地址选择,A0-A9...
差分时钟(CK,/ CK)和数据探测(DQS, / DQS) DQ,DQS,DM的双倍数据速率 数据完整性 由DRAM内置TS自动刷新(ASR) 自动刷新和自刷新模式 省电模式 部分阵列自刷新(PASR)1 省电模式 信号完整...
• Bidirectional data strobe (DQS) transmitted/ received with data, i.e., source-synchronous data capture (x16 has two – one per byte) • Internal, pipelined double-data-rate (DDR) architecture; two ...
很好很强大。修复U盘的强大工具。只要是ADATA的都能用
1 千兆位 (1Gb) 双倍数据速率 2 (DDR2) DRAM 是一种高速 CMOS 双倍数据速率 2 SDRAM 包含 1,073,741,824 位。它在内部配置为八进制存储体 DRAM。 1Gb 芯片组织为 32Mbit x 4 I/O x 8 bank、16Mbit x 8 I/O x 8 bank ...
1.使用的 ambiq apollo3的spi接口(IOM),驱动SD卡; 2.移植fatfs文件系统; 3.main测试程序;
- Double-data rate on DQs, DQS and DM Data Integrity - Auto Self Refresh (ASR) by DRAM built-in TS - Auto Refresh and Self Refresh Modes Power Saving Mode - Partial Array Self Refresh (PASR)1 - ...
的在线附录存储库 理解多方冲突中的联盟动态:基于代理的多目标空间模型方法 提供给公众观看 2020年4月
SQL Server 数据库引擎包括数据库引擎(用于存储、处理和保护数据的核心服务)、复制、全文搜索、用于管理关系数据和 XML 数据的工具以及 Data Quality Services(DQS) 服务器。 分析服务Analysis Services 包括...
根据 DQS 认证的质量管理体系按 照 DIN EN ISO9001 标准制造的 (认证注册编号:FM25845)。DQS 认证得到了所有 EQ Net 国家的承 认 (注册号:FM25845) 订货时请与您当地的西门子办事处联系 一般介绍 MICROMASTER 410 ...
集团企业公司编码:(LL3698-KKI1269-TM2483-LUI12689-ITT289-DQS58-MG198) 集团企业公司编码:(LL3698-KKI1269-TM2483-LUI12689-ITT289-DQS58-MG198) A多媒体会议系统扩声测试记录表全文共7页,当前为第1页。...