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Set the proper file permissions at the operating system level, as there often can be a security loophole at this level. The default permissions on a newly created file in most UNIX systems are rw-rw-rw. This means that any users who gain admission to the UNIX server can read or copy all files, including your database files. You should set the UMASK variable to 022, so only the Oracle username can read from and write to database files. Ensure that you remove the SETUID on all Oracle files immediately. Some of the SETUID files may allow the execution of scripts as the root user in UNIX systems. The UTL_FILE package enables writing to operating system files from within an Oracle PL/SQL program. When you use the UTL_FILE_DIR initialization parameter, never use the * value for the parameter, which means that the package could output files to any directory in the operating system s file system. Restrict the directories to some well-known locations that are exclusively set apart from the UTL_FILE output files.

Everything inhibiting concurrency that can be removed has been removed I have seen actual cases where a report written by a developer who did not understand Oracle s multi-versioning capabilities would lock an entire system up as tight as could be The reason: the developer wanted to have read-consistent (ie, correct) results from his queries In every other database the developer had worked with, this required locking the tables, or using a SELECT WITH HOLDLOCK (a SQL Server mechanism for locking rows in a shared mode as you go along) So the developer would either lock the tables prior to running the report or use SELECT FOR UPDATE (the closest he could find to WITH HOLDLOCK) This would cause the system to basically stop processing transactions needlessly.

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The following example shows how you might use the DBMS_CRYPTO built-in package in Oracle 10g to compute these hashes/checksums. The technique would also be applicable for the other two listed packages; the logic would not be very much different, but the APIs you call would be. Here we query out the information for department 10 to be displayed in some application. Immediately after querying the information, we compute the hash using the DBMS_CRYPTO package. This is the version information that we retain in our application: ops$tkyte@ORA10G> begin 2 for x in ( select deptno, dname, loc 3 from dept 4 where deptno = 10 ) 5 loop 6 dbms_output.put_line( 'Dname: ' || x.dname ); 7 dbms_output.put_line( 'Loc: ' || x.loc ); 8 dbms_output.put_line( 'Hash: ' || 9 dbms_crypto.hash 10 ( utl_raw.cast_to_raw(x.deptno||'/'||x.dname||'/'||x.loc), 11 dbms_crypto.hash_sh1 ) ); 12 end loop; 13 end; 14 / Dname: ACCOUNTING Loc: NEW YORK Hash: C44F7052661CE945D385D5C3F911E70FA99407A6 PL/SQL procedure successfully completed. As you can see, the hash is just a big string of hex digits. The return value from DBMS_CRYPTO is a RAW variable, and when displayed it will be implicitly converted into HEX for us. This is the value we would want to use before updating. To update that row, we would retrieve and lock the row in the database as it exists right now, and then compute the hash value of that retrieved row and compare this new hash value with the hash value we computed when we read the data out of the database. The logic for doing so could look like the following (in real life, we would use bind variables for the literal hash values, of course):

Oracle Enterprise Manager is Oracle s GUI-based management tool that lets you manage one or more databases efficiently OEM enables security management, backups, and routine user and object management Because OEM is GUI-based, you don t have to know a lot of SQL to use the tool However, understanding the V$ and dynamic performance views will enhance your knowledge of how the database works OEM will be an even more powerful tool in your hands after you master the management of the database using the data dictionary based and dynamic performance table based SQL queries Oracle has really improved OEM in its most recent versions, and all serious practitioners of the trade should master the use of the tool for both daily database management and scheduling routine database administration tasks and troubleshooting 4 explains the configuration and use of the OEM tool set.

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