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PASSWORD mode enables you to secure a dump file set when you transmit it to a remote database, but requires you to provide a password using the ENCRYPTION_PASSWORD parameter during the export. The database will require you to provide the same password during the import of the dump file set. TRANSPARENT mode enables you to create a dump file set without using the ENCRYPTION_PASSWORD parameter. You use this parameter when you re importing the same database from which you exported the dump file set. Here s an example that shows how to specify the dual value for the ENCRYPTION_MODE parameter. $ expdp hr DIRECTORY=dpump_dir1 DUMPFILE=hr.dmp ENCRYPTION=all ENCRYPTION_PASSWORD=encrypt_pwd ENCRYPTION_ALGORITHM=AES256 ENCRYPTION_MODE=dual

You can use the ENCRYPTION_PASSWORD parameter to encrypt table data or metadata in the export dump file to prevent unauthorized users from reading data from the dump set. Note that if you specify ENCRYPTION_PASSWORD and omit the ENCRYPTION parameter, the database encrypts all data written to the export dump set.

Figure 7-34. Showing which component an object belongs to The component box is the symbol used also in UML 2. A component can contain any number of objects or classes. Showing components on diagrams can be useful to emphasize signal paths that cross component boundaries. Of note is the fact that components don t need to be numbered. In top-level diagrams, it may be convenient to show the signals entering and leaving a component, without regard to which internal objects are involved. When showing signals entering and leaving a component, pins are not used, because pins are an indication of an internal mechanism that receives and sends signals. Instead, signals attach directly to the component box, as shown in Figure 7-35.

Note If you export a table with encrypted columns but don t specify the ENCRYPTION_PASSWORD parameter, the database stores the encrypted table column or columns as clear text in the export dump file when you do this. The database issues a warning when this happens.

You can supply any password you want when you export a table, even if the table has encrypted columns. The password you supply doesn t have to be the same as the password you use when encrypting a table column. If you set the ENCRYPTION_MODE parameter to PASSWORD or DUAL, the database requires that you also specify the ENCRYPTION_PASSWORD parameter. The following example shows how to pass a value of testpass for the ENCRYPTION_PASSWORD parameter: $ expdp hr TABLES=employee_s_encrypt DIRECTORY=dpump_dir DUMPFILE=hr.dmp ENCRYPTION=ENCRYPTED_COLUMNS_ONLY ENCRYPTION_PASSWORD=testpass The dump file for the export will encrypt the encrypted columns in the employees table.

Two interesting parameters enable you to estimate how much physical space your export job will consume: ESTIMATE and ESTIMATE_ONLY.

Figure 7-35. Signals shown at the component level If a diagram shows signals at the component level, there should also be a diagram that reveals the inner objects of the component, showing exactly which objects send and receive the signals, as shown in Figure 7-36. Signals that travel between objects in the same component may be shown, if useful. As mentioned earlier, the goal is to show only those signals that are appropriate for the level of detail depicted in the diagram. With describing a complex component, the full details of its inner workings might be shown at different levels, using different diagrams.

The ESTIMATE parameter will tell you how much space your new export job is going to consume. The space estimate is always in terms of bytes. You can specify that the database provide you the space estimates using either the number of database blocks (BLOCKS option) in the objects that are going to be exported or the optimizer statistics (STATISTICS option) for the tables. The following is the syntax of the ESTIMATE parameter specification: ESTIMATE={BLOCKS | STATISTICS}