KM_Pres_PA_Ch7_update_fall_05

KM_Pres_PA_Ch7_update_fall_05 - Chapter 7 Project Q A...

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Chapter 7 Project Q & A Functions of a DBMS
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Functions Data storage, retrieval and update User accessible catalog Management of shared/concurrent update Provision for backup and recovery Provision for security Integrity services Support of data independence  Support for replication Utilities
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What most users think of when using a  database How is this done in Oracle? Data Storage, Retrieval and Update
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User Accessible Catalog Crucial information for understanding a  database Also called metadata Also called a data-dictionary How does Oracle do this?
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Oracle’s Approach Data dictionary is actually views based on  underlying tables called system tables Systems tables hold data about tables, rows,  views, columns, security, users, permissions,  and other things… Oracle 8i has over 900 views! Most are used internally by Oracle for  optimization but some are useful to you Warning:  Don’t mess with these tables
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All_catalog All_users Dba_free_space User_tab_privs_made User_tab_privs_recd User_constraints Oracle’s Approach  (cont) The table names will usually start with  DBA,  USER, ALL, SYS Select table_name from all_synonyms
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