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An important part of security management is keeping up with the latest news about security vulnerabilities and the patches or workarounds to overcome them. Oracle has a policy of quickly issuing fixes for new security problems, so you should check for the latest security patches on the Oracle MetaLink web site (http://metalink.oracle.com). You can find regular Oracle security alerts at the following location: http://technet.oracle.com/ deploy/security/alerts.htm. You can also find news about security breaches on the MetaLink site in the News & Notes section. If you wish, Oracle will send you e-mail security alerts about new issues. You can sign up for this free service by registering at http://otn.oracle.com/deploy/security/ alerts.htm. Oracle provides Critical Patch Updates on a quarterly schedule, and Oracle s customers are notified of these updates via MetaLink, the OTN Security Alerts page, and the Oracle Security RSS newsfeed. If you re already a MetaLink subscriber, you are automatically signed up for the Critical Patch Updates. If a patch addresses a severe threat, Oracle will not wait for the quarterly Critical Patch Update to send the patch to you. In such cases, Oracle will issue an unscheduled Security Alert through MetaLink and will let you immediately download the patch. The patch will also be included in the next quarterly Critical Patch Update. For the most part, though, Critical Patch Updates will be the process by which most patches will be released by Oracle from now on. Critical Patch Updates are comprehensive patches that address significant security vulnerabilities and include fixes you can apply, prerequisites for the security fixes, or both. You can thus have a regular, planned quarterly schedule for patching your system. A single patch on a quarterly basis is better than a number of patches that need extensive testing and may conflict with each other.

You may occasionally see errors like the following when new users you have created try accessing the database through SQL*Plus: Error accessing PRODUCT_USER_PROFILE Warning: Product user profile information not loaded! You may need to run PUPBLD.SQL as SYSTEM The product_user_profile table is a table Oracle maintains to control access to the database through SQL*Plus. 12 discusses how to use the product_user_profile table to restrict operations by certain users. Make sure you are logged in as the SYSTEM user and run the following script to ensure that this table can be accessed properly by all users, so that their SQL*Plus privileges can be checked properly: SQL> @$ORACLE_HOME/sqlplus/admin/pupbld.sql DROP SYNONYM PRODUCT_USER_PROFILE . . . Synonym created. SQL>

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Oracle has also introduced a new Risk Matrix along with its quarterly Critical Patch Updates. The Risk Matrix enables customers to estimate the scope and severity of the vulnerabilities addressed by each Critical Patch Update. The Risk Matrix tells you the threat you face to confidentiality, integrity, and availability, and the conditions under which your system is most exploitable. You can thus assess the risk to your system and prioritize patching on those systems.

The initora file is the initialization file where you specify values for all the parameters you intend to use at database-creation time But what if you need to change some of the parameters later on You can do so in two ways: You can change the initora parameters, and stop and start the database instance Or, if the parameter is dynamically configurable, you can change its value while the instance is running Although being able to dynamically reconfigure database parameters is nice, there are inherent problems with this approach When you restart the database, dynamically changed parameters are gone, because they weren t part of the initora file; if you intend to make a change permanent after you dynamically change it, you have to remember to correctly modify the init.

Oracle doesn t require or recommend that you use its Advanced Security option to secure your Oracle databases. However, the Advanced Security option provides so many strong security features that you may want to consider using it if your business needs warrant the highest degree of data and network security. Here are some of the additional security features available when you use Oracle s Advanced Security option: Encryption of network traffic among clients, application servers, and databases Sophisticated authentication methods for users Centralized user management Support for Public Key Infrastructure (PKI)

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