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In addition to using the standard Oracle auditing features described in the previous sections, you can also take advantage of Oracle s Flashback capabilities to audit changes made to a table s rows. For example, you can use the Flashback Query feature to examine a table s data at a past point in time. Using the Flashback Transaction Query, you can find out all the changes made to a row since a past point in time or an SCN. The Flashback Versions Query will return each version of a row that existed in the specified period. You can easily identify the user and the specific operation that resulted in any inappropriate or unauthorized modifications to data. Using the transaction details from this query, you can go ahead and identify the entire transaction(s) with the help of another flashback feature, Flashback Transaction Query. The Flashback Query, Flashback Versions Query, and Flashback Transaction Query features rely on undo data and are discussed in detail in 8.

We haven t analyzed our tables in a while. They used to be small, but now when we look at them, they have grown quite large. An index will now make sense, whereas it didn t originally. If we analyze the table, it will use the index. Without correct statistics, the CBO cannot make the correct decisions.

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Suppose you re interested in using auditing to find out whether users are viewing data in a table they re not really supposed to access. For example, say a manager is supposed to be able to see salary-related information for employees working for him. Can you tell whether the manager is also looking at the salary information of his superiors Do you need to audit all the SELECT statements done by the manager Auditing all SELECT statements would lead to a colossal amount of audit data, but fortunately there s an easy out. Oracle lets you audit actions in the database on the basis of content. That is, you can specify that the audit records be written not for all SELECT, INSERT, UPDATE, and DELETE statements, but only for statements that meet certain criteria. Instead of trying to determine policy violations based on what is being done to any data, you apply fine-grained auditing (FGA) policies to individual tables or specific operations that you wish to monitor.

VARCHAR2: Also currently synonymous with VARCHAR This is a variable-length character string that differs from the CHAR type in that it is not blank padded to its maximum length A VARCHAR2(10) may contain between 0 and 10 bytes of information using the default NLS settings A VARCHAR2 may store up to 4,000 bytes of information NVARCHAR2: A variable-length character string that contains UNICODE formatted data An NVARCHAR2(10) may contain between 0 and 10 characters of information An NVARCHAR2 may store up to 4,000 bytes of information RAW: A variable-length binary datatype, meaning that no character set conversion will take place on data stored in this datatype It is considered a string of binary bytes of information that will simply be stored by the database It may store up to 2,000 bytes of information NUMBER: This datatype is capable of storing numbers with up to 38 digits of precision.

In my experience, these six cases are the main reasons I find that indexes are not being used. It usually boils down to a case of They cannot be used using them would return incorrect results or They should not be used if they were used, performance would be terrible.

Sometimes you want to locate a file, but you aren t sure where it might be located in the file system. The whereis command, of course, is of help only if you are locating commands, not files. To find out where a file or a directory is, you can use the find command, as shown here: $ pwd /u01/app/oracle $ find . -name bill.sql -print ./dba/bill.sql $ In this example, the find command informs you that the bill.sql file is located in the /u01/app/ oracle/dba directory. Note that there is a dot after the find keyword, indicating that a recursive search is made from the present directory every directory and subdirectory under the present directory will be searched. If you want to search from a specific directory, you need to specify that in the command. In the following example, the find command starts its search from the root (/) file system and prints the location of the test.txt file to the screen, if it finds it: $ find / -name test.txt -print

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