Manual file organization system - PowerPoint PPT Presentation
Cause-and-Effect Diagram
Cause-and-Effect Diagram. What is it?. An analysis tool that provides a systematic way of looking at effects and their respective causes Developed by Dr. Kaoru Ishikawa of Japan in 1943 and is sometimes referred to as an Ishikawa Diagram or a Fishbone Diagram because of its shape.
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File System Organization
File System Organization. Chapter 17. Key concepts in chapter 17. File system structures on disk free blocks file descriptors mounting file systems location of file blocks variations Booting an OS File system optimization log-structured file systems. File systems.
File Organization
File Organization . Internal/External Memory Tecnologies. Memory Hierarchy Technologies. 3 Memory Hierarchies/Clusters. Memory Clusters. Internal. Electronic Disks. External. Internal Memory Cluster. Internal Memory. Core. MOS RAM/ROM. Others. Core Memory (1). Core Memory (2).
FILE ORGANIZATION
FILE ORGANIZATION. TYPES OF FILE ORGANIZATION. Serial Sequential Indexed Sequential Direct Access /Random Access. Serial File Organization. A collection of records No particular sequence Cannot be used as master Used as temporary transaction file Records stored in the order received.
File Organization
File Organization. קובץ ישיר מתקדם Advanced Direct File. n. m. (1) קובץ ישיר מתקדם - Advanced Direct File. בקובץ ישיר מתקדם מספר המקומות בקובץ – m משתנה, לעומת קובץ ישיר קלאסי ששם m קבוע כאשר m משתנה – פונקצית הגיבוב משתנה
File Organization
File Organization. Aspects of Size Parameters. Blocking Aspects. גיווש רשומות באורך קבוע – אין בעיה. גיווש רשומות באורך משתנה – אין בעיה לגווש אבל יש בעיה לפתוח גיווש! בפתיחת גיווש איך יודעים איפה הגבולות בין הרשומות המשתנות?. How to block variable records?.
FILE ORGANIZATION
FILE ORGANIZATION. TYPES OF FILE ORGANIZATION. Serial Sequential Indexed Sequential Direct Access /Random Access. Serial File Organization. A collection of records No particular sequence Cannot be used as master Used as temporary transaction file Records stored in the order received.
File Organization
File Organization. Hardware Size Parameters. Our special notation. סימון : פירושו number of per - . הערכים של ושל נלקחים בין השאר מהרשימה:
File organization
File organization. File Organizations (Indexes). Choices for accessing data during query evaluation Scan the entire collection Typical in early (batch) retrieval systems Computational and I/O costs are O (characters in collection) Practical for only “small” text collections
File Organization
File Organization . Introduction. Data, Information & Knowledge. Three Similar Terms? Data - נתונים Information - מידע Knowledge - ידע. What’s the difference? Definitions?. Data. Data - נתונים raw material basic facts supplied substance Input to the process!. Information.
File Organization
File Organization. Memory Hierarchy. Thanks to Adi Gutman and Noa Cohen. assembler/compiler. Interface. Computer. Processor. Control. Memory. Input. Datapath. Output. Computer Organization point of view. Basic Memory Hierarchies. Internal Memory Hierarchy. תת-מדרג זיכרון פנימי.