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Obviously, this export cannot be imported into the new structure it will not fit. This check prevents that from occurring. If you remember, I mentioned that we can change the behavior of the object identifier assigned to an object instance. Instead of having the system generate a pseudo primary key for us, we can use the natural key of an object. At first, this might appear self-defeating the SYS_NC_OID$ column will still appear in the table definition in SYS.COL$ and, in fact, it will appear to consume massive amounts of storage as compared to the system-generated column. Once again, however, there is magic at work here. The SYS_NC_OID$ column for an object table that is based on a primary key and not system generated is a virtual column and consumes no real storage on disk. Here is an example that shows what happens in the data dictionary and demonstrates that there is no physical storage consumed for the SYS_NC_OID$ column. We ll start with an analysis of the systemgenerated OID table: ops$tkyte@ORA11GR2> create table people of person_type 2 / Table created. ops$tkyte@ORA11GR2> select name, type#, segcollength 2 from sys.col$ 3 where obj# = ( select object_id 4 from user_objects 5 where object_name = 'PEOPLE' ) 6 and name like 'SYS\_NC\_%' escape '\' 7 / NAME TYPE# SEGCOLLENGTH ------------------------- ---------- -----------SYS_NC_OID$ 23 16 SYS_NC_ROWINFO$ 121 1 ops$tkyte@ORA11GR2> insert into people(name) 2 select rownum from all_objects; 48217 rows created. ops$tkyte@ORA11GR2> exec dbms_stats.gather_table_stats( user, 'PEOPLE' ); PL/SQL procedure successfully completed. ops$tkyte@ORA11GR2> select table_name, avg_row_len from user_object_tables; TABLE_NAME AVG_ROW_LEN ------------------------------ ----------PEOPLE 23

The result is a standardized mechanism by which the developer can check all business objects for validity. The UI developer should also be able to retrieve a list of currently broken rules to display to the user (or for any other purpose). Additionally, this provides the underlying data required to implement the System.ComponentModel.IDataErrorInfo interface defined by the .NET Framework. This interface is used by the data binding infrastructure in WPF and Windows Forms to automate the display of validation errors to the user. Some validation rules may interact with the database or could be very complex in other ways. In these cases, you may want to allow the user to move on to editing other data while a validation rule is running in the background. To this end, you can choose to implement a validation rule (though not a business rule) to run asynchronously on a background thread. The reason this works only with validation rules is that an async rule method won t have access to the real business object. For thread safety reasons, it is provided with a copy of the property values to be validated so it can do its work. Since a business rule manipulates the business object s data, I don t allow them to be implemented as asynch operations.

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NTP has been around now for two decades The question is, how soon will they be able to recognize it as the key to time transcendence.

We see here that the average row length is 23 bytes: 16 bytes for the SYS_NC_OID$ column and 7 bytes for the NAME column. Now, let s do the same thing, but use a primary key on the NAME column as the object identifier: ops$tkyte@ORA11GR2> CREATE TABLE "PEOPLE" 2 OF "PERSON_TYPE" 3 ( constraint people_pk primary key(name) ) 4 object identifier is PRIMARY KEY 5 / Table created. ops$tkyte@ORA11GR2> select name, type#, segcollength 2 from sys.col$ 3 where obj# = ( select object_id 4 from user_objects 5 where object_name = 'PEOPLE' ) 6 and name like 'SYS\_NC\_%' escape '\' 7 / NAME TYPE# SEGCOLLENGTH ------------------------------ ---------- -----------SYS_NC_OID$ 23 81 SYS_NC_ROWINFO$ 121 1 According to this, instead of a small 16-byte column, we have a large 81-byte column! In reality, there is no data stored in there. It will be null. The system will generate a unique ID based on the object table, its underlying type, and the value in the row itself. We can see this in the following: ops$tkyte@ORA11GR2> insert into people (name) 2 values ( 'Hello World!' ); 1 row created. ops$tkyte@ORA11GR2> select sys_nc_oid$ from people p; SYS_NC_OID$ ------------------------------------------------------------------------------F610733A48F865F9E030007F0100149A00000017260100010001002900000000000C07001E01000 02A00078401FE000000140C48656C6C6F20576F726C642100000000000000000000000000000000 0000 ops$tkyte@ORA11GR2> select utl_raw.cast_to_raw( 'Hello World!' ) data 2 from dual; DATA ------------------------------------------------------------------------------48656C6C6F20576F726C6421 ops$tkyte@ORA11GR2> select utl_raw.cast_to_varchar2(sys_nc_oid$) data 2 from people; DATA ------------------------------------------------------------------------------<garbage bits and bytes..>Hello World!

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