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With languages that separate the class declaration from the implementation, static coupling is transitive if coupling is due to type references in a class declaration. C++ is an example of a language that uses separate files for class declaration and implementation. Assume you have three C++ classes: A, B, and C. Each class has a header file and an implementation file. Let s call the header files A.h, B.h, and C.h. Let s call the implementation files A.cpp, B.cpp, and C.cpp. Assume A.h contains a reference to class B, and that B.h contains a reference to class C. With this arrangement, A is type-coupled to B and B is type-coupled to C. When compiling A, the compiler needs to load the header file A.h, which references B. When the compiler tries to load the declaration for B in B.h, it discovers the reference to C and must load C.h. As a result, the compiler needs to access the declarations for B and C in order to build A. The implication is that type coupling is transitive. Things change if the referenced types are not in header files but in implementation files. Assume A.cpp contains a reference to B. It follows that A.cpp needs to include the file B.h. Assume also that B.cpp contains a reference to C, so B.cpp needs to include the file C.h. To compile B, the compiler needs C.h. To compile A, the compiler needs B.h. This time, B.h contains no references to C, so the compiler won t need C. The implication is that, in this scenario, type coupling is not transitive.

If you re using Automatic Undo Management (AUM), the DBA_UNDO_EXTENTS view contains detailed information about the various undo extents, including their status. The STATUS column shows the transaction status of the undo data in the extents, and can take the following three values:

The DBMS_RESUMABLE Oracle-supplied package populates the DBA_RESUMABLE view with details about the start time, end time, and error messages related to the resumable statements in the database. The following simple query finds out which statements are resumable in the database: SQL> 2 3 4 5 6* SELECT start_time, suspend_time, resume_time, name,sql_text FROM DBA_RESUMABLE;

Now, we simply turn on AUTOTRACE to see the statistics of statements we execute in SQL*Plus: ops$tkyte@ORA10G> set autotrace on statistics ops$tkyte@ORA10G> select username, sid, serial#, server, paddr, status 2 from v$session 3 where username = USER 4 /.

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The new DBA_CPU_USAGE_STATISICS view shows the CPU usage statistics, including the time at which the CPU usage changed.

With languages that merge the class declaration and implementation together, type coupling is not transitive. To understand why, let class A contain a reference to class B, so A is type-coupled to B. Let class B contain a reference to class C, so B is type-coupled to C. To compile B, you need to have C. To compile A, you need to have B, but not C, because A doesn t reference anything defined in class C. Everything the compiler needs to compile A is contained in the compiled code for B.

How do you find out what constraints exist on a table s columns When a process fails with the message Referential integrity constraint violated, what s the best way to find out what the constraint and the affected tables are The constraint- and index-related data dictionary views are critical for resolving problems similar to these. In the following sections, you ll examine the key constraintand index-related views.

USERNAME SID SERIAL# SERVER PADDR --------- ---- -------- --------- -------OPS$TKYTE 151 1511 DEDICATED AE4CF614 OPS$TKYTE 153 3196 DEDICATED AE4CF614

The DBA_CONSTRAINTS view provides information on all types of table constraints in the database. You can query this view when you need to figure out what type of constraints a table has. The view lists several types of constraints, as shown by the following query: SQL> SELECT DISTINCT constraint_type FROM DBA_CONSTRAINTS; Constraint_type --------------C /* check constraints */ P /* primary key constraint */ R /* referential integrity (foreign key) constraint */ U /* unique key constraint */ SQL> The following query lets you know what, if any, constraints are in the TESTD table. The response indicates that the table has a single check constraint defined on it. The SYS prefix in the NAME column shows that CONSTRAINT_NAME is a default name, not one that was explicitly named by the owner of the table. SQL> SELECT constraint_name, constraint_type 2 FROM DBA_CONSTRAINTS 3* WHERE table_name='TESTD';

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