TAILIEUCHUNG - OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P29

OCA /OCP Oracle Database 11g A ll-in-One Exam Guide- P29:There is an ever increasing demand for staff with IT industry certification. The benefits to employers are significant—they can be certain that staff have a certain level of competence—and the benefits to the individuals, in terms of demand for their services, are equally great. Many employers are now requiring technical staff to have certifications, and many IT purchasers will not buy from firms that do not have certified staff. | OCA OCP Oracle Database 11g All-in-One Exam Guide 236 are static you must restart the instance for a change to take effect. This is intended to provide extra security as it reduces the likelihood that they can be changed temporarily to an inappropriate setting without the DBA being aware of it. UTL_FILE_DIR The UTL_FILE_DIR instance parameter defaults to NULL and is therefore not a security problem. But if you need to set it take care. This parameter gives PL SQL access to the file system of the server machine through the UTL_FILE supplied package. The package has procedures to open a file either a new file or an existing one and read from and write to it. The only limitation is that the directories listed must be accessible to the Oracle owner. The difficulty with this parameter is that being set at the instance level it offers no way to allow some users access to some directories and other users access to other directories. All users with execute permission on the UTL_FILE package have access to all the directories listed in the UTL_FILE_DIR parameter. The parameter takes a comma-separated list of directories and is static. To set it follow the syntax in this example which gives access to two directories and restart the instance SQL alter system set utl_file_dir oracle tmp oracle interface scope spfile TIP The UTL_FILE_DIR parameter can include wildcards. Never set it to because that will allow all users access to everything that the database owner can see including the ORACLE_HOME and all the database files. REMOTE_OS_AUTHENT and OS_AUTHENT_PREFIX The REMOTE_OS_AUTHENT instance parameter defaults to FALSE. This controls whether a user can connect to the database from a remote computer without the need to supply a password. The reasons for wanting to do this have largely disappeared with modern computer systems but the capability is still there. In the days before all users had intelligent terminals such as PCs it was customary for users to log on directly to the

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