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The DBA_POLICIES view shows all the security policies in the database. You can find out what operations (SELECT, INSERT, UPDATE, and DELETE) are in the policy and whether the package is enabled.

Listing 23-11 shows a typical query on the DBA_POLICIES view. Note that in this example, there are no user-created polices. The sys_default group is the default policy group for all policies. Listing 23-11. Querying the DBA_POLICIES View SQL> 2 3 4 5 6* SELECT policy_name, policy_group, object_name, sel,ins,upd,del, enable FROM dba_policies;

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Since it is legal to call Dispose multiple times on a single object, you must implement managed classes to support multiple destructor calls on a single object. This requirement does not exist for destructors of native classes. In the FileDumper sample shown previously, no special handling for this case is done. When Dispose is called a second time, it calls Dispose on its child objects again and relies on them to ignore this second Dispose call. If your destructor contains cleanup code, you have to ensure explicitly that cleanup is not done twice. The helper type DisposedFlag can be useful for this problem, too. The next block of code shows how a destructor for FileDumper could be implemented: FileDumper::~FileDumper() { if (disposedFlag) // already disposed return; // ignore this call /* do your cleanup here */ } The implementation discussed so far is not thread safe. If your class provides thread safety, you must also handle the case in which two threads call Dispose simultaneously. I will address this question in the context of reliable resource cleanup in 11. Even though the documentation does not explicitly disallow throwing exceptions other than System::ObjectDisposedException in IDisposable::Dispose, you should not throw exceptions in your destructor function. To understand this restriction, consider the following code: void f() { FileDumper fd("sample.txt"); DoSomething(); } When an exception is thrown in DoSomething, the FileDumper object will be disposed because it leaves scope before the exception is handled. If the destructor of FileDumper also throws an exception, the caller of f will see the last exception that was thrown, not the exception thrown in DoSomething, which is the one that actually caused the problem.

POLICY_NAME POLICY_GROUP OBJECT_NAM SEL INS UPD DEL ENAB ------------------------------ ------------------------------ -----SERVLET_xdbrls_del SYS_DEF SERVLET NO NO NO YES YES SERVLET_xdbrls_sel SYS_DEF SERVLET YES NO NO NO YES ftp-log14__xdbrls_del SYS_DEF ftp-log14_ TAB NO NO NO YES YES ftp-log14__xdbrls_sel SYS_DEF ftp-log14_ TAB YES NO NO NO YES http-log20_xdbrls_del SYS_DEF http-log20_TAB NO NO NO YES YES http-log20_xdbrls_sel SYS_DEF http-log20_TAB YES NO NO NO YES SQL> The DBA_SEC_RELEVANT_COLUMNS view shows all the security-related columns of all security policies in the database.

The DBA_ENCRYPTED_COLUMNS view shows the encryption algorithm information for all encrypted columns in a database. Here s a query that shows all encrypted column names, the encryption algorithm used to protect the data in the columns, and whether the column is encrypted with salt. For more information on the new transparent data-encryption feature, which enables you to perform column encryption in Oracle Database 10g Release 2, see 11. SQL> SELECT * FROM DBA_ENCRYPTED_COLUMNS; OWNER TABLE_NAME COLUMN_NAME ENCRYPTION_ALG --------------------------------------HR EMPLOYEE EMP_ID AES 192 bits key HR EMPLOYEE SSN_ID AES 192 bits key HR EMPLOYEE PHONE_NO AES 192 bits key SQL> SALT ---YES YES YES

The DBA_BLOCKERS view shows all sessions that are blocking other sessions by locking objects that the other sessions are waiting for. The view is extremely useful when you re examining locking situations. The DBA_WAITERS view, on the other hand, shows all the sessions that are waiting for a lock. Here's a simple query using the DBA_BLOCKERS view: SQL> SELECT waiting_session, blocking_session, lock_type FROM DBA_BLOCKERS; WAITING_SESSION --------------159 SQL> HOLDING_SESSION ---------------139 LOCK_TYPE -----------Transaction

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The DBA_OUTLINES view provides information on all outlines in the database. You can use this view or the DBA_OUTLINE_HINTS view to view the hints in the outlines. Here s the structure of the DBA_OUTLINES view: SQL> DESC DBA_OUTLINES Name Null Type ------------- ------------------------NAME VARCHAR2(30) OWNER VARCHAR2(30) CATEGORY VARCHAR2(30) USED VARCHAR2(9) TIMESTAMP DATE VERSION VARCHAR2(64) SQL_TEXT LONG SQL>