使用数据库字典和动态性能视图

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1、使用数据库字典和动态性能视图目标学完这个课程，你应该可以掌握你下内容:区别内置的数据库对象区别数据字典的内容和用法理解数据字典视图是如何创建的区别数据字典视图的种类查询数据字典和动态性能视图理解administrativescript命名规则内置的数据库对象Otherobjectscreatedwiththedatabase:DataDictionaryPerformancetablesPL/SQLpackagesDatabaseeventtriggersDataDictionaryCentraltoeveryOracleda

2、tabaseDescribesthedatabaseanditsobjectsContainsread-onlytablesandviewsStoredintheSYSTEMtablespaceOwnedbytheuserSYSMaintainedbytheOracleserverAccessedwithSELECTControlfilesDatafilesRedoLogfilesDatabaseDataDictionarytablesBaseTablesandDataDictionaryViewsThedatadictio

3、narycontainstwoparts:BasetablesStoresdescriptionofthedatabaseCreatedwithCREATEDATABASEDatadictionaryviewsUsedtosimplifythebasetableinformationAccessedthroughpublicsynonymsCreatedwiththecatalog.sqlscriptCreatingDataDictionaryViewsScriptPurposecatalog.sqlCreatescommon

4、lyuseddatadictionaryviewsandsynonymscatproc.sqlRunsscriptsrequiredforserver-sidePL/SQLDataDictionaryContentsThedatadictionaryprovidesinformationabout:LogicalandphysicaldatabasestructuresDefinitionsandspaceallocationsofobjectsIntegrityconstraintsUsersRolesPrivilegesA

5、uditingHowtheDataDictionaryisUsedPrimaryuses:Oracleserverusesittofindinformationabout:UsersSchemaobjectsStoragestructuresOracleservermodifiesitwhenaDDLstatementisexecuted.UsersandDBAsuseitasaread-onlyreferenceforinformationaboutthedatabase.DataDictionaryViewCategori

6、esThreesetsofstaticviewsDistinguishedbytheirscope:DBA:WhatisinalltheschemasALL:WhattheusercanaccessUSER:Whatisintheuser’sschemaUSER_xxxObjectsownedbythecurrentuserALL_xxxObjectsaccessiblebythecurrentuserDBA_xxxAlloftheobjectsinthedatabaseDataDictionaryExamplesGenera

7、lOverviewDICTIONARY,DICT_COLUMNSSchemaobjectsDBA_TABLES,DBA_INDEXES,DBA_TAB_COLUMNS,DBA_CONSTRAINTSSpaceallocationDBA_SEGMENTS,DBA_EXTENTSDatabasestructureDBA_TABLESPACES,DBA_DATA_FILESDynamicPerformanceTablesVirtualtablesRecordcurrentdatabaseactivityContinuallyupda

8、tedwhilethedatabaseisoperationalInformationisaccessedfrommemoryandcontrolfileUsedtomonitorandtunethedatabaseOwnedbySYSuserSynonymsbeginwit