The Hidden Oracle Analysis

Wednesday, March 9, 2022 12:34:03 PM

The Hidden Oracle Analysis



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We bring together the very best trainers and providers of IT, Technical and Project Management courses to help bridge the skills gap and ensure you and your workforce develop the skills needed to succeed now, and in the future. You might not know the workload of your data warehouse in advance, so a data warehouse should be optimized to perform well for a wide variety of possible query and analytical operations. OLTP systems support only predefined operations.

Your applications might be specifically tuned or designed to support only these operations. A data warehouse is updated on a regular basis by the ETL process run nightly or weekly using bulk data modification techniques. The end users of a data warehouse do not directly update the data warehouse except when using analytical tools, such as data mining, to make predictions with associated probabilities, assign customers to market segments, and develop customer profiles. In OLTP systems, end users routinely issue individual data modification statements to the database.

The OLTP database is always up to date, and reflects the current state of each business transaction. Data warehouses often use partially denormalized schemas to optimize query and analytical performance. A typical data warehouse query scans thousands or millions of rows. For example, "Find the total sales for all customers last month. A typical OLTP operation accesses only a handful of records. For example, "Retrieve the current order for this customer. Data warehouses usually store many months or years of data. This is to support historical analysis and reporting. OLTP systems usually store data from only a few weeks or months.

The OLTP system stores only historical data as needed to successfully meet the requirements of the current transaction. As an O racle data warehousing administrator or designer, you can expect to be involved in the following tasks:. Monitoring the data warehouse's performance and taking preventive or corrective action as required. In a small-to-midsize data warehouse environment, you might be the sole person performing these tasks. In large, enterprise environments, the job is often divided among several DBAs and designers, each with their own specialty, such as database security or database tuning. For more information regarding database security, see Oracle Database Security Guide.

Data warehouses and their architectures vary depending upon the specifics of an organization's situation. Three com mon architectures are:. Data Warehouse Architecture: Basic. Data Warehouse Architecture: with a Staging Area. Figure shows a simple architecture for a data warehouse. End users directly access data derived from several source systems through the data warehouse. In Figure , the metadata and raw data of a traditional OLTP system is present, as is an additional type of data, summary data. Summaries are a mechanism to pre-compute common expensive, long-running operations for sub-second data retrieval. For example, a typical data warehouse query is to retrieve something such as August sales.

A summary in an Oracle database is called a materialized view. The consolidated storage of the raw data as the center of your data warehousing architecture is often referred to as an Enterprise Data Warehouse EDW. An EDW provides a degree view into the business of an organization by holding all relevant business information in the most detailed format. You must clean and process your operational data before putting it into the warehouse, as shown in Figure You can do this programmatically, although most data warehouses use a staging area in stead.

A staging area simplifies data cleansing and consolidation for operational data coming from multiple source systems, especially for enterprise data warehouses where all relevant information of an enterprise is consolidated. Figure illustrates this typical architecture. Although the architecture in Figure is quite common, you may want to customize your warehouse's architecture for different groups within your organization.

You can do this by adding data marts , which are systems designed for a particular line of business. Figure illustrates an example where purchasing, sales, and inventories are separated. In this example, a financial analyst might want to analyze historical data for purchases and sales or mine historical data to make predictions about customer behavior. Data marts can be physically instantiated or implemented purely logically though views. Furthermore, data marts can be co-located with the enterprise data warehouse or built as separate systems. Building an end-to-end data warehousing architecture with an enterprise data warehouse and surrounding data marts is not the focus of this book.

It contains: What Is a Data Warehouse? What Is a Data Warehouse? This helps in: Maintaining historical records Analyzing the data to gain a better understanding of the business and to improve the business In addition to a relational database, a data warehouse environment can include an extraction, transportation, transformation, and loading ETL solution, statistical analysis, reporting, data mining capabilities, client analysis tools, and other applications that manage the process of gathering data, transforming it into useful, actionable information, and delivering it to business users.

A common way of introducing data warehousing is to refer to the characteristics of a data warehouse as set forth by William Inmon: Subject Oriented Integrated Nonvolatile Time Varient Subject Oriented. Time Varient. Key Characteristics of a Data Warehouse The ke y characteristics of a data warehouse are as follows: Data is structured for simplicity of access and high-speed query performance. End users are time-sensitive and desire speed-of-thought response times. Large amounts of historical data are used. Queries often retrieve large amounts of data, perhaps many thousands of rows. Both predefined and ad hoc queries are common. The data load involves multiple sources and transformations. Here are some examples of differences between typical data warehouses and OLTP systems: Workload Data warehouses are designed to accommodate ad hoc queries and data analysis.

Data modifications A data warehouse is updated on a regular basis by the ETL process run nightly or weekly using bulk data modification techniques. Schema design Data warehouses often use partially denormalized schemas to optimize query and analytical performance. Typical operations A typical data warehouse query scans thousands or millions of rows. Common Data Warehouse Tasks As an O racle data warehousing administrator or designer, you can expect to be involved in the following tasks: Configuring an Oracle database for use as a data warehouse Designing data warehouses Performing upgrades of the database and data warehousing software to new releases Managing schema objects, such as tables, indexes, and materialized views Managing users and security Developing routines used for the extraction, transformation, and loading ETL processes Creating reports based on the data in the data warehouse Backing up the data warehouse and performing recovery when necessary Monitoring the data warehouse's performance and taking preventive or corrective action as required In a small-to-midsize data warehouse environment, you might be the sole person performing these tasks.

Data Warehouse Architectures Data warehouses and their architectures vary depending upon the specifics of an organization's situation. Data Warehouse Architecture: Basic Figure shows a simple architecture for a data warehouse. Data Warehouse Architecture: with a Staging Area You must clean and process your operational data before putting it into the warehouse, as shown in Figure Data Warehouse Architecture: with a Staging Area and Data Marts Although the architecture in Figure is quite common, you may want to customize your warehouse's architecture for different groups within your organization.

Note: Data marts can be physically instantiated or implemented purely logically though views.

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