secondary storage

Database systems always involve secondary storage——the disks and other devices that store large amounts of data that persists over time. This chapter summarizes what we need to know about how a typical computer system manages storage. We review the memory hierarchy of devices with progressively slower access but larger capacity. We examine disks in particular and see how the speed of data access is affected by how we organize our data on the disk. We also study mechanisms for making disks more reliable.

冷库维护结构保温缺陷的红外检测技术，李夔宁，王贺，介绍了红外成像法在冷库保温缺陷中的检测原理，以matlab为平台对红外图片进行直方图均衡化及自适应滤波和中值滤波处理，从而直观的展示冷库结构中的保温缺陷，提供了一种高效、直观的检测方法。

Oracle provides several types for storing binary data such as BFILE, BLOB, BAW(L), and LONG RAW to handle data like images, sounds, and videos. Typically, in real-world projects, images and sounds are not stored directly in the database. Instead, the paths to the files are stored, and only when security requirements are high, the actual files might be stored in the database. BAW(L), LONG RAW, BLOB, and BFILE each serve different use cases depending on the data type and storage requirements.

详细介绍了如何在SQL Server环境中使用赛门铁克的Veritas Storage Foundation实现高可用性配置，包含详细的步骤说明，适合初学者阅读。技术进阶，可以更深入地了解存储双活的实施细节。

The Inventory Purchase-Sales-Storage Project Table Structure provides a comprehensive breakdown of essential tables, relationships, and data types required for managing inventory operations effectively. Each table aligns with core functionalities such as purchasing, sales tracking, and stock management. Key Table Structure Purchase Table: Contains fields like supplier ID, purchase date, item ID, quantity, and purchase price, essential for tracking all procurement activities. Sales Table: Manages customer ID, sales date, item ID, quantity, and sales price. It ensures detailed tracking of each sale and supports effective revenue management. Inventory Table: Records item ID, stock quantity, minimum stock level, and reorder level, forming the core of stock management. Additional Tables Supplier and Customer Tables: For detailed records of both suppliers and customers. Transactions Log: Tracks all inventory movements, essential for auditing purposes. This structure ensures streamlined operations across purchase, sales, and inventory control, with relational links that maintain data integrity and operational efficiency.