You can use the DBA_USERS view to find out the profile, temporary tablespace, or default tablespace assigned to users. Although there s a PASSWORD column, you can t find out the password, because the password is encrypted. There are two ways you can log in as a user if you don t know the user s password. First, you can simply change the user s password by using the ALTER USER command. However, this permanently changes the user s password, which may not be what you want to do. The following example shows the other way to log in as a different user without knowing that user s password. (In this case, the user is called hr. ) First, find out the encrypted version of hr s password: SQL> SELECT password FROM DBA_USERS 2 WHERE username='HR'; PASSWORD -----------------------------4C6D73C3E8B0F0DA SQL> Second, alter hr s password: SQL> ALTER USER hr IDENTIFIED BY new_pass; User altered. SQL> Third, when you re done using hr s username and you want to change the password to its original (unknown) version, use the following statement: SQL> ALTER USER hr IDENTIFIED BY VALUES '4C6D73C3E8B0F0DA'; User altered.

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The following code shows how you can use a simple helper class to protect instances of the FileDumper class against calls after disposal: ref class DisposedFlag { bool isDisposed; String^ objectName; public: DisposedFlag(String^ objectName) : isDisposed(false), objectName(objectName) {} ~DisposedFlag() { isDisposed = true; } // support cast to bool operator bool() { return isDisposed; } void EnsureObjectIsNotDisposed() { if (isDisposed) throw gcnew ObjectDisposedException(objectName); } };.

This is the main rule for processing special-purpose mail messages. It is the beginning of the rule, and it creates a lock file that exists while the message is being processed. The lock file prevents the next applicable message in the mail queue from being processed until the processing of the current message is complete. If our system receives lots of mail and the script to process mail messages takes a while to finish, there could arise several instances running simultaneously on different messages, all trying to access the same temporary files at once. The presence of the lock file indicates that an instance of the script is already running and another should not start. The next line of the rule checks the Subject: header line for an occurrence of the string getthisfile.

The DBA_PROFILES view provides information about user profiles. You ll find out that this view is one of your most important aids in managing user resource allocation. Two important values under the RESOURCE_TYPE column are KERNEL and PASSWORD. Here s the structure of this view: SQL> DESC DBA_PROFILES Name ----------------------------------------PROFILE RESOURCE_NAME RESOURCE_TYPE LIMIT SQL> Null -------NOT NULL NOT NULL Type ------------VARCHAR2(30) VARCHAR2(32) VARCHAR2(8) VARCHAR2(40)

The following simple example shows how you can query the DBA_PROFILES view to find out what a user s password profile looks like. Listing 23-6 shows the results of the query. Listing 23-6. Querying the DBA_PROFILES View SQL> 2 3 4 5 6* SELECT resource_name,limit FROM DBA_PROFILES p, dba_users u WHERE p.profile=u.profile AND u.username='HR' AND p.resource_type='PASSWORD';


The ROLE_ROLE_PRIVS dictionary view shows the roles that have been granted to roles. For example, the DBA role is granted to all database administrator accounts. If you query the ROLE_ROLE_ PRIVS view, you ll see the roles that are granted to you through the DBA role that you already have. Listing 23-7 shows the query s output. Listing 23-7. Querying the ROLE_ROLE_PRIVS View SQL> SELECT granted_role FROM ROLE_ROLE_PRIVS 2 WHERE role='DBA'; GRANTED_ROLE -----------------------OLAP_DBA XDBADMIN JAVA_ADMIN JAVA_DEPLOY WM_ADMIN_ROLE EXP_FULL_DATABASE IMP_FULL_DATABASE DELETE_CATALOG_ROLE SELECT_CATALOG_ROLE EXECUTE_CATALOG_ROLE GATHER_SYSTEM_STATISTICS 11 rows selected. SQL> The DBA_ROLES view only lists all the roles in the database, along with a column stating whether the grantee can grant this role to others or not.

If the string is matched, then the body of the rule will be applied. The body of the rule follows the condition, in this case the subject matching getthisfile, and is enclosed in braces. I m not going to talk in detail about the syntax of the procmail rules, because the procmail man page is very good; there is also a man page for procmailex that is dedicated to examples of rules for the .procmailrc file. Assuming that the subject line of the message contains getthisfile, the message itself is sent to the script.

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