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ops$tkyte@ORA10G> select dbms_lobgetlength(os_file) from t; DBMS_LOBGETLENGTH(OS_FILE) --------------------------1056768 We can see the file pointed to is 1MB in size Note that the use of MY_DIR in the INSERT statement was intentional If we use mixed case or lowercase, we would get the following: ops$tkyte@ORA10G> update t set os_file = bfilename( 'my_dir', 'testdbf' ); 1 row updated ops$tkyte@ORA10G> select dbms_lobgetlength(os_file) from t; select dbms_lobgetlength(os_file) from t * ERROR at line 1: ORA-22285: non-existent directory or file for GETLENGTH operation ORA-06512: at "SYSDBMS_LOB", line 566 That example just points out that DIRECTORY objects in Oracle are identifiers, and identifiers are stored in uppercase by default The BFILENAME built-in function accepts a string, and this string s case must match the case of the DIRECTORY object exactly as stored in the data dictionary.

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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These may seem like surprisingly obvious statements, but in my experience, too many people approach the database as if it were a black box something that they don t need to know about. Maybe they have a SQL generator that will save them from the hardship of having to learn SQL. Maybe they figure they ll just use it like a flat file and do keyed reads. Whatever they assume, I can tell you that thinking along these lines is most certainly misguided; you simply can t get away with not understanding the database. This chapter will discuss why you need to know about the database, specifically why you need to understand: The database architecture, how it works, and what it looks like. What concurrency controls are, and what they mean to you. How to tune your application from day one. How some things are implemented in the database, which is not necessarily the same as how you think they should be implemented. What features your database already provides and why it is generally better to use a provided feature than to build your own.

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.

So, we must either use uppercase in the BFILENAME function or use quoted identifiers when creating the DIRECTORY object: ops$tkyte@ORA10G> create or replace directory "my_dir" as '/tmp/' 2 / Directory created ops$tkyte@ORA10G> select dbms_lobgetlength(os_file) from t; DBMS_LOBGETLENGTH(OS_FILE) --------------------------1056768 I recommend against using quoted identifiers; rather, use the uppercase name in the BFILENAME call Quoted identifiers are not usual and tend to create confusion downstream A BFILE consumes a varying amount of space on disk depending on the length of the DIRECTORY object name and the file name In the preceding example, the resulting BFILE was about 35 bytes in length In general, you ll find the BFILE consumes approximately 20 bytes of overhead plus the length of the DIRECTORY object name plus the length of the file name itself BFILE data is not read consistent as other LOB data is.

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.

Why you might want more than a cursory knowledge of SQL. That the DBA and developer staff are on the same team, not enemy camps trying to outsmart each other at every turn.

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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