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CHAPTER 14 US IN G DA TA PUMP EXPORT AND IMPORT
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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
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ENCRYPTION_PASSWORD
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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.
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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.
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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.
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Estimation Parameters
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Two interesting parameters enable you to estimate how much physical space your export job will consume: ESTIMATE and ESTIMATE_ONLY.
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ESTIMATE
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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}
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C HA PTE R 14 USI NG D AT A PU MP EXPORT A ND IMPO RT
By default, Oracle estimates the export job space requirements in terms of blocks. It simply takes your database block size and multiplies it by the number of blocks all the objects together will need. Here is an example of what you ll see in your log file (and on the screen): Estimate in progress using BLOCKS method . . . Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA Total estimation using BLOCKS method: 654 KB Since the space estimation in terms of blocks is the default behavior, you don t need to specify the ESTIMATE parameter during the export. However, if you have analyzed all your tables recently, you can ask the Data Pump Export utility to estimate the space requirements by using the statistics the database has already calculated for each of the tables. In order to tell the database to use the database statistics (rather than use the default BLOCKS method), you need to specify the ESTIMATE parameter in the following manner: ESTIMATE=STATISTICS Here s what you ll see in your log file when you use the ESTIMATE=STATISTICS parameter: Estimate in progress using STATISTICS method . . . Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA . estimated "SYSTEM"."HELP" Total estimation using STATISTICS method: 65.72 KB
35.32 KB
ESTIMATE_ONLY
While the ESTIMATE parameter is operative only during an actual export job, you can use the ESTIMATE_ONLY parameter without starting an export job. Listing 14-4 shows one such example. Listing 14-4. Using the ESTIMATE_ONLY Parameter $ expdp system/sammyy1 estimate_only=y Export: Release 11.1.0.6.0 - Production on Saturday, 22 March, 2008 11:19:4 Copyright (c) 2003, 2007, Oracle. All rights reserved.
Connected to: Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - P tion With the Partitioning, OLAP, Data Mining and Real Application Testing optio FLASHBACK automatically enabled to preserve database integrity. Starting "SYSTEM"."SYS_EXPORT_SCHEMA_01": system/******** estimate_only=y Estimate in progress using BLOCKS method . . . Processing object type SCHEMA_EXPORT/TABLE/TABLE_DATA . estimated "SYSTEM"."REPCAT$_AUDIT_ATTRIBUTE" 64 KB . . . . estimated "SYSTEM"."SQLPLUS_PRODUCT_PROFILE" 0 KB Total estimation using BLOCKS method: 320 KB Job "SYSTEM"."SYS_EXPORT_SCHEMA_01" successfully completed at 11:20:16 C:\> Although the log indicates that the export job successfully completed, all the previous job really did was to estimate the space that you will need for the actual export job.
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