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所在平台: Udemy |
课程主页: https://www.udemy.com/course/vsamvenkatsince2010/
课程评论：没有评论
**主旨**: 本課程深入淺出地介紹Mainframe環境下的虛擬儲存體存取方法（VSAM）及其相關應用。 **核心內容**: * **VSAM 概述**: * 定義VSAM資料集及存取方法。 * 闡述VSAM比其他磁碟存取方法更複雜的功能。 * 說明VSAM獨特的記錄格式。 * **VSAM 資料集類型**: * **KSDS (Key Sequence Data Set)**: * 最常見的VSAM類型，支援按鍵值進行隨機存取。 * 適合可變長度的記錄，IMS系統常用。 * **ESDS (Entry Sequence Data Set)**: * 記錄按順序儲存，支援循序存取。 * IMS、DB2和z/OS UNIX系統使用。 * **RRDS (Relative Record Data Set)**: * 支援按記錄編號進行隨機存取。 * 適合應用程式能衍生目標記錄編號的場景。 * **LDS (Linear Data Set)**: * 作為位元組串資料集，是z/OS檔案系統中唯一的位元組串格式。 * DB2和z/OS系統函式常用，應用程式較少使用。 * **VSAM 與 非VSAM 的區別**: 比較VSAM與其他非VSAM資料集的差異。 * **VSAM 內部結構**: * 控制區間 (CI - Control Interval) 的概念。 * 控制區 (CA - Control Area) 的概念。 * **IDCAMS 工具與指令**: * 使用IDCAMS工具創建KSDS、ESDS、RRDS檔案。 * 詳細解釋`DEFINE`（定義）、`REPRO`（複製）、`PRINT`（列印）、`DELETE`（刪除）、`LISTCAT`（列表目錄）、`ALTER`（變更）等核心IDCAMS指令。 * **實用工具介紹**: * File Manager 工具。 * DITTO 工具。 **學習重點**: 本課程強調實務操作，大部分概念將在Mainframe環境中進行實際演練，確保學習者能夠掌握VSAM的實際應用。
This course consist of: What is VSAM?Cluster DefinitionDifferences between VSAM and NON-VSAM datasetsDifferences between KSDS, ESDS, RRDS and LDS What is Control Interval (CI) and Control Area (CA)How to create KSDS, ESDS, RRDS files using IDCAMS utility Explained different IDCAMS utility commandsDEFINEREPROPRINTDELETELISTCATALTERFile Manager toolDITTO toolThis course is totally practical oriented hence you will get almost all concepts explanation on Mainframe Shop.What is VSAM?The term Virtual Storage Access Method (VSAM) applies to both a data set type and the access method used to manage various user data types.As an access method, VSAM provides much more complex functions than other disk access methods. VSAM keeps disk records in a unique format that is not understandable by other access methods.Different type of VSAM datasets:Key Sequence Data Set (KSDS)This type is the most common use for VSAM. Each record has one or more key fields and a record can be retrieved (or inserted) by key value. This provides random access to data. Records are of variable length. IMS uses KDSDs.Entry Sequence Data Set (ESDS)This form of VSAM keeps records in sequential order. Records can be accessed sequentially. It is used by IMS, DB2, and z/OS UNIX.Relative Record Data Set (RRDS)This VSAM format allows retrieval of records by number; record 1, record 2, and so forth. This provides random access and assumes the application program has a way to derive the desired record numbers.Linear Data Set (LDS)This type is, in effect, a byte-stream data set and is the only form of a byte-stream data set in traditional z/OS files (as opposed to z/OS UNIX files). DB2 and a number of z/OS system functions use this format heavily, but it is rarely used by application programs.
