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ora file so those changes will become permanent the next time the database reads the file when it s restarted Often, DBAs forget to perform this manual chore The server parameter file is an alternative (or a complement) to the initora file, and it makes the dynamic parameter changes permanent on an ongoing basis You can specify that any dynamic parameter changes made by using the ALTER SYSTEM command be saved permanently in the server parameter file, which already consists of all the parameters in the regular initora file After you create the database, you can create the SPFILE from your initora file as shown in the next section If you later use this SPFILE to start your database, all dynamic changes made to the initialization parameters can be permanently saved in the SPFILE.

Although the security guidelines thus far have mostly dealt with preventing unauthorized access to your network and the database, it s extremely important that you review the application security policies to ensure no vulnerabilities exist there. There are some commonsense policies involving roles and SQL*Plus use that your organization must enforce to provide strong application security.

By using the SPFILE, you can ensure that dynamic parameter changes will not be lost in between database shutdowns and restarts The file is called a server file because it is always maintained on the machine where the Oracle database server is located Oracle recommends the use of the SPFILE to dynamically maintain the database configuration parameters..

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You ve already seen in the section on data security how you can use roles to encapsulate privileges rather than granting privileges directly to various users. You should minimize the number of direct object privileges by letting stored code such as procedures and packages be the means through which users can issue DML statements. Then you can just grant the user the privilege to execute a certain package or procedure to perform any DML actions. Once the package or procedure completes executing, the user will not have the privilege to perform the DML activity from outside the stored code.

The number of dynamically modifiable parameters in Oracle Database 11g is quite high. More than half of the initialization parameters are dynamically changeable through the ALTER SYSTEM statement, which means that the SPFILE is a smart way to permanently record a dynamically changed parameter value. When the database is started, unless you specify the type of initialization file and its location explicitly, Oracle will look for the SPFILE first. On UNIX/Linux systems, the default location for the SPFILE is the $ORACLE_HOME/dbs/ directory ($ORACLE_HOME\dbs in Windows). In the default directory, Oracle first looks for a file named spfile$ORACLE_SID.ora (in our case, for the database nina, this would be spfilenina.ora). If it can t find this file, it then looks for a file named spfile.ora. If spfile.ora isn t found, Oracle will next look for the init.ora file in the same default directory. The init.ora file is traditionally named init$ORACLE_SID.ora (in our example, it is initnina.ora).

All application roles should use the SET ROLE statement to enable the roles granted to users. Application users should be granted roles only for specific purposes, and the roles should be revoked from them when they aren t needed any longer. Application owners should consider creating secure application roles, which are enabled by PL/SQL packages. Once you create and assign a secure application role to a user, it automatically gets assigned to the user when the user logs in to the database.

Although the SPFILE is placed in the $ORACLE_HOME/dbs directory by default, you can place it anywhere as long as you specify the location in an initialization parameter file by using the SPFILE parameter.

One of the first things you should do when opening your database to the public is to tightly restrict the ability of users to use the SQL*Plus interface. You can restrict the SQL*Plus capabilities of a user by using the product_user_profile table.

The V$SPPARAMETER dynamic view is comparable to the V$PARAMETER view and is used to record all the initialization parameter names and their values when using the SPFILE rather than the init.ora file.

In this section you ll examine some simple scripts that can help you manage your users. You ll also learn about some typical problems that you might encounter in this area.

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