w公共查询表复制至每一个碎片 http://www.agildata.com/database-sharding/ In the Bookstore example, the Primary Shard Table is the ‘customer’ entity. This is the table that is used to shard the data. The ‘customer’ table is the parent of the shard hierarchy, with th…

In previous articles we have utilized NSUserDefaults and .NET web services to persist iPhone data. NSUserDefaults is idol for storing small amounts of data. Web services are used to store the data on a custom server. In this article we will take a lo…

Data that has no "natural" representation with printable characters must, for inclusion in an XML file, still be represented in printable characters. The simple technique for this consists in converting the binary byte values to their hexadecima…

使用DAC,能够将database的schema 和 data 从一个server 或 cloud 上复制到另外一个server上,存储schema 和 data的文件是 .bacpac 文件. 方法一,使用SSMS Wizard 右击Databases,打开“Import Data-tier Application”,打开Wizard,按照UI提示配置即可 方法二,使用SqlPackage.exe 实现自动Import DAC Import the bacpac file to SQLAzur…

Oracle Schema Objects Oracle Data Types 数据类型 Data Type Description NUMBER(P,S) Number value having a maximum number of digits p, with a digits to the right of the decimal point. VARCHAR2(s) Variable-length character value of maximum size s DATE Date…

This article explains how to use a chart to display data in an ASP.NET Web Pages (Razor) website by using the Chart helper. What you'll learn: How to display data in a chart. How to style charts using built-in themes. How to save charts and how to ca…

原文地址:http://www.javacodegeeks.com/2015/07/mysql-vs-mongodb.html 1. Introduction It would be fair to say that as IT professionals we are living in the golden age of data management era. As our software systems become more complex and more distributed,…

Creating a complex data model 创建复杂数据模型 8 of 9 people found this helpful The Contoso University sample web application demonstrates how to create ASP.NET Core 1.0 MVC web applications using Entity Framework Core 1.0 and Visual Studio 2015. For informa…

原文:https://codesmith.atlassian.net/wiki/display/Generator/Configuring+and+troubleshooting+a+Schema+Provider The sections below will help guide you through using and configuring various Schema Providers that ship with CodeSmith Generator. Creating a n…

Getting Started with Windows Azure SQL Data Sync In this tutorial, you learn the fundamentals of Windows Azure SQL Data Sync using the Windows Azure (Preview) portal. This tutorial assumes minimal prior experience with SQL Server and Windows Azure SQ…

简介 Spring.NET为事务管理提供了一个持久化抽象(consistent abstraction ),其优点如下: 为不同事务API,例如ADO.NET,Enterprise Services,System.Transactions和NHibernate,提供了一个持久化编程模型. 为以上数据获取技术的声明式事务管理(declarative transaction management) 提供支持. 为可编程事务管理(programmatic transaction management)…

什么是Data Redaction Data Redaction是Oracle Database 12c的高级安全选项之中的一个新功能,Oracle中国在介绍这个功能的时候,翻译为“数据编纂”,在EM12c R3的中文界面中,这个功能被翻译成“数据编写”,我认为后一个翻译更贴切. 在12c发布前,某次以“数据库安全”为题目的技术交流中,有一个客户问我们,Oracle数据库里面能不能实现这么一个功能:符合条件的用户可以看到表里面的所有数据,而另外一些人(业务权限低的用户)虽然能查询表,但是某些敏感…

关于我们为什么需要Schema Registry? 参考, https://www.confluent.io/blog/how-i-learned-to-stop-worrying-and-love-the-schema-part-1/ https://www.confluent.io/blog/schema-registry-kafka-stream-processing-yes-virginia-you-really-need-one/ https://www.confluent.io/bl…

//读取数据库中所有的数据库 USE MASTER DECLARE @is_policy_automation_enabled bit SET @is_policy_automation_enabled = (SELECT CONVERT(bit, current_value) FROM msdb.dbo.syspolicy_configuration WHERE name = 'Enabled') SELECT dtb.name AS [Database_Name], 'Server[@Nam…

2015-02-16 Created By BaoXinjian…

目录 1. 什么是JSON Schema? 2. 如何定义一个JSON Schema 3. 如何测试JSON Schema a) 使用JSON Schema validator GUI b) 在Java code里使用JSON Schema validator 4.参考文档 什么是JSON Schema? JSON模式是基于JSON格式定义JSON数据结构的规范. 描述现有的数据格式 干净的人类和机器可读的文档 完成结构验证, 用户 自动化测试 验证客户端提交的数据 如何定义一个JSON Sch…

--Comparing data between two tables in SQL Server --Create two Tables-- CREATE TABLE TableA(ID Int, ProuctName Varchar(256)) GO CREATE TABLE TableB(ID Int, ProuctName Varchar(256)) GO INSERT INTO TableA VALUES(1,'A') INSERT INTO TableA VALUES(2,'B')…

Migrations¶ 4 of 4 people found this helpful The Contoso University sample web application demonstrates how to create ASP.NET Core 1.0 MVC web applications using Entity Framework Core 1.0 and Visual Studio 2015. For information about the tutorial ser…

Motivation [反正债多了不愁,再开个方向.] Data plays a core role in most business systems, data storage and retrieval tasks seem plain to regular application developers, even managers, while how to connect or link data to gain more interesting patterns(more techni…

What is Core Data? If you want to build anything beyond the most simplistic apps for iOS, you’ll need a way to persist data. Luckily, Apple provides the Core Data framework, a persistence layer that efficiently handles the coordination of saving/upda…

A data contract describes how CLR types map to XSD schema definitions. Data contracts are the preferred way to enable serialization of complex types included in operation signatures as parameters or return values. You create a data contract by applyi…

原地址: Home / Database / Oracle Database Online Documentation 11g Release 2 (11.2) / Database Administration Data Types Each value manipulated by Oracle Database has a data type. The data type of a value associates a fixed set of properties with the va…

Managing Hierarchical Data in MySQL Introduction Most users at one time or another have dealt with hierarchical data in a SQL database and no doubt learned that the management of hierarchical data is not what a relational database is intended for. Th…

Schema for Clojure Data Shape Declaration and Validation 1.何为schema schema是描写叙述数据形式的一种clojure数据结构,可用于文件.校验函数和数据. 以下举个样例让大家对schema有个整体认识. 例: (ns schema-examples (:require [schema.core :as s])) (def  s-type s/Str) (s/validate  s-type  "123")  ;; S…

[12c]扩展数据类型(Extended Data Types)-- MAX_STRING_SIZE 在12c中,与早期版本相比,诸如VARCHAR2, NAVARCHAR2以及 RAW这些数据类型的大小会从4K以及2K字节扩展至32K字节.只要可能,扩展字符的大小会降低对LOB 数据类型的使用.为了启用扩展字符大小,你必须将MAX_STRING_SIZE的初始数据库参数设置为EXTENDED. 要使用扩展字符类型需要执行以下过程: 1.关闭数据库 2.以升级模式重启数据库3.更改参数: ALT…

Oracle Data Pump(以下简称数据泵)是Oracle 10g开始提供的一种数据迁移工具,同时也被广大DBA用来作为数据库的逻辑备份工具和体量较小的数据迁移工具.与传统的数据导出/导入工具,即exp/imp工具相比,数据泵更为高效和安全,数据泵主要包含以下三个部分: 操作系统命令行客户端,expdp和impdp: DBMS_DATAPUMP PL/SQL包(也被认为是Data Pump API): DBMS_METADATA PL/SQL包(也被认为是Metadata API). DB…

Overview of Data Blocks Oracle Database manages the logical storage space in the data files of a database in units called data blocks, also called Oracle blocks or pages. A data block is the minimum unit of database I/O. Data Blocks and Operating Sys…

1. 引言 什么是Json Schema? 以一个例子来说明 假设有一个web api,接受一个json请求,返回某个用户在某个城市关系最近的若干个好友.一个请求的例子如下: { "city" : "chicago", "number": 20, "user" : { "name":"Alex", "age":20 } } 在上面的例子中,web api要求提供cit…

Saving data to a database is ideal for repeating or structured data, such as contact information. This class assumes that you are familiar with SQL databases in general and helps you get started with SQLite databases on Android. The APIs you'll need…

http://www.windowsazure.com/en-us/develop/net/fundamentals/cloud-storage/ Managing and analyzing data in the cloud is just as important as it is anywhere else. To let you do this, Windows Azure provides a range of technologies for working with relati…