PK and FK - NUMBER vs RAW

Environment: Oracle 11.2.0.3 EE on Solaris


I have an application that has been converted to a MS Access database support.


The Access database uses data NUMBER for all primary keys and foreign keys types.


Key in the Access database are extracted a function SEQUENCE-type of access (no functional significance).


The new application is written in Java and the designers/developers decided to use a RAW data type (16) for the primary and foreign keys.


I don't know how the RAW keys are generated.


Why would they change from one type of data in a RAW data type NUMBER (16)?


Better performance when you perform the DML?


Is it somehow more secure?  If so, how?  I couldn't find any favorable material on this one here.


The values that I saw in the RAW keys are 32 hexadecimal characters, so it must be taken from storage much more than the NUMBER keys.


No indication of their decision would be greatly appreciated!


-gary

Most likely code generates GUIDS. GUIDS are RAW (16). They occupy the space more comparing numbers and SYS_GUID() is about 3 times slower than the sequence. However, they are random and so there isn't so much less chance that you will experience awaits on index written in oltp systems very heavy. And they are unique (finally almost unique) across from external systems.

SY.

Tags: Database

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