Oracle Database 11 g - Online Public Access Catalog

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252 CHAPTER 5 ■ DATABASE SECURITYAssign HostsThe ASSIGN_ACL procedure is used to authorize access to one or more network hosts. The networkhost can be internal or external to the company. In this particular example, you are allowingthe database to be able to make HTTP calls to the dbaexpert.com web site. The dbaexpert.comsite is a four-CPU server running Debian Linux version 2.4.1 BEGIN2 DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL (3 acl => 'dba.xml',4 host => 'dbaexpert.com',5 lower_port => 80,6 upper_port => 443);7* END;8 /PL/SQL procedure successfully completed.The lower port and upper port parameters are null by default. You should preface thelower and upper port ranges for tighter security. The lower port defines the lower boundariesof the allowable port ranges. The upper port defines the upper boundaries for the allowableport ranges. These port ranges should be defined only for connect privileges; they should notbe set for resolve privileges. There is another caveat to the port ranges. If you omit one of theparameters but define the other, then both parameters take the value of the one you provided.For example, if you set lower_port to 80 and do not define the port value for upper_port, theupper_port parameter automatically inherits the value of 80.■Tip You can use the XML DB HTTP protocol to view the contents of the dba.xml file. You can view thedba.xml ACL for this particular server using this URL: http://rac104.dbaexpert.com:8080/sys/acls/dba.xml.Since you created the ACL, assigned privileges/principals, and authorized network entities,you can validate that the ACL permissions worked accordingly. Take a look at the UTL_HTTP.REQUEST API to retrieve a web page from the dbaexpert.com web site to confirm that thenetwork access rights work as planned:SQL> select utl_http.request('http://www.dbaexpert.com') from dual;UTL_HTTP.REQUEST('HTTP://WWW.DBAEXPERT.COM')--------------------------------------------------------------------------------
CHAPTER 5 ■ DATABASE SECURITY 253<strong>Database</strong> Experts.........Since this example returns a valid HTML page, you can conclude that the ACL host assignmentworked as planned. If the sufficient ACL privileges or ACL assignments are not provided,you will receive the dreaded ORA-24247 error:SQL> select utl_http.request('http://dbaexpert.com') from dual;*ERROR at line 1:ORA-29273: HTTP request failedORA-06512: at "SYS.UTL_HTTP", line 1577ORA-24247: network access denied by access control list (ACL)ORA-06512: at line 1■Note If you are testing the setup using the DBMS_NETWORK_ACL_ADMIN package, make sure you commit. Allchanges to the ACL are transactional. Records must be committed like any other database records.Maintain <strong>Access</strong> Control ListsTwo more procedures to maintain the fine-grained access of UTL APIs are DROP_ACL and DELETE_PRIVILEGE. Use the DROP_ACL procedure to remove the XML file from the /sys/acls directory.Use DELETE_PRIVILEGE to remove an access control entry from the XML file. For example, if youwant to remove CKIM’s ACE from the dba.xml control list, you would simply execute thefollowing:1 begin2 dbms_network_acl_admin.DELETE_PRIVILEGE3 (ACL =>'dba.xml',4 PRINCIPAL => 'CKIM');5* end;SQL> /PL/SQL procedure successfully completed.
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The EXPERT’s VOIce ® IN ORACLEAl
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Contents at a GlanceAbout the Autho
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■CONTENTSixSQL*Plus New Features
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■CONTENTSxiEnterprise Manager Int
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■CONTENTSxiiiCombined Capture and
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■CONTENTSxvImprovements in Redo T
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About the Authors■SAM ALAPATI is
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xxii■ACKNOWLEDGMENTSNothing I do
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xxiv■INTRODUCTIONPerformance Mana
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xxvi■INTRODUCTION• The easy add
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2 CHAPTER 1 ■ INSTALLING, UPGRADI
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302 CHAPTER 6 ■ BACKUP AND RECOVE
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CHAPTER 7■ ■ ■Data PumpDBAs a
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CHAPTER 7 ■ DATA PUMP 315if test
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CHAPTER 7 ■ DATA PUMP 317DBA11g1
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CHAPTER 7 ■ DATA PUMP 319Encrypti
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CHAPTER 7 ■ DATA PUMP 321Please b
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CHAPTER 7 ■ DATA PUMP 323Remappin
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CHAPTER 7 ■ DATA PUMP 325SELECT d
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CHAPTER 7 ■ DATA PUMP 327Document
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CHAPTER 7 ■ DATA PUMP 329SQL> sel
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CHAPTER 7 ■ DATA PUMP 331SQL> sel
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CHAPTER 7 ■ DATA PUMP 333DBMS_OUT
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CHAPTER 7 ■ DATA PUMP 335If you a
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338 CHAPTER 8 ■ ORACLE STREAMSLat
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342 CHAPTER 8 ■ ORACLE STREAMSSQL
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358 CHAPTER 8 ■ ORACLE STREAMSSup
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CHAPTER 9■ ■ ■Storage Managem
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CHAPTER 9 ■ STORAGE MANAGEMENT 36
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416 CHAPTER 10 ■ DATA GUARD• Lo
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418 CHAPTER 10 ■ DATA GUARDsql ch
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440 CHAPTER 10 ■ DATA GUARDCustom
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442 CHAPTER 10 ■ DATA GUARDselect
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446 CHAPTER 11 ■ APPLICATION DEVE
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CHAPTER 12■ ■ ■Data Warehousi
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566 ■INDEXadvise failure command,
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568 ■INDEXDBMS_ADDM package, 216-
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570 ■INDEXcdump diagnostic direct
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586 ■INDEXOCISessionGet( ) method
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600 ■INDEXOracle Audit Vault, 259
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Oracle Database 11 g - Online Public Access Catalog

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