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You cannot use a typical INDEX RANGE SCAN on encrypted columns, only equality can be used to access data via an index when the index is on an encrypted column We ll revisit this limitation in the Limitations of Column Encryption section shortly It is important to understand that the index would be on encrypted data itself This implies that the data in the index is therefore encrypted, which would be mandatory It would not make sense to encrypt the column in the table but not in the index; if we did not encrypt the column in the index, an attacker would be able to retrieve the clear text values of that column easily using a query such as select /*+ index(t index_name) */ rowid, column from t where column is not null without the encryption keys.

So, if the index stored the data non-encrypted, a simple strings command could be used to see the data (as observed previously in this chapter), a binary editor on the file could retrieve it, or the person who gained access to your datafiles could extract the column values from the index itself and join them back to the table later..

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The n-level undo support implemented by UndoableBase requires that every object implements the property and three methods listed in this interface. Putting these methods in an interface is a double-edged sword. On one hand, it clearly defines the methods and will make it easier to implement UndoableBase. On the other hand, these methods are now potentially available to any code using a business object. In other words, a UI developer could write code to call these methods almost certainly causing nasty bugs and side effects because these methods aren t designed for public use. This is a difficult design decision when building frameworks. In this case, the benefits of having a common interface for use by UndoableBase appears to outweigh the potential risk of a UI developer doing something foolish by calling the methods directly. To help minimize this risk, the actual implementation methods in the base classes will keep these methods Private. That way, they can be called only by directly casting the object to the IUndoableObject type.

Here is one of the first questions I get asked when discussing data encryption: What is the performance overhead The only truthful answer to that question is It depends; anywhere from 0 percent to a lot. It depends on how you access the data, how frequently you access the data, and what you do to the data.

Suppose, for example, you have a table in your application that serves as an online store: Create table customer ( cust_id number primary key, .. other data credit_card# varchar2(50) encrypt ); What performance impact could you expect after encrypting the CREDIT_CARD# column as compared to before encrypting it Well, if you accessed the CREDIT_CARD# only when the customer checked out of your store, the overhead of encrypting the data would be very small, perhaps not even truly measurable. Let s say that you access the CREDIT_CARD# column only in the following circumstances: You retrieve it when the customer checks out. You access the credit card once for one row only, which you retrieved via the primary key index on CUST_ID. This is very infrequent on a per customer basis. A typical customer might buy something from you once a week or so. You modify it when the customer updates their credit card information approximately once every year or two when their card expires. In other words, almost never.

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