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They processed the same exact number of rows and very similar numbers of blocks (minor variations coming from accidental ordering of rows in the table and consequential optimizations made by Oracle), used equivalent amounts of CPU time, and ran in about the same elapsed time (run this same test again and the CPU and ELAPSED numbers will be a little different, but on average they will be the same). There are no inherent efficiencies to be gained by placing the columns in order of how discriminating they are, and as stated previously, with index key compression there is an argument for putting the least selective first. If you run the preceding example with COMPRESS 2 on the indexes, you ll find that the first index will perform about two-thirds the I/O of the second, given the nature of the query in this case. However, the fact is that the decision to put column C1 before C2 must be driven by how the index is used. If you have lots of queries like the following: select * from t where c1 = :x and c2 = :y; select * from t where c2 = :y;

Tip One of the common arguments against the use of Oracle database auditing is that it will consume a lot of space in the database. If you spend time analyzing why you are auditing, you can limit the amount of data written to the audit trail. By using a focused auditing policy that targets only vital data, rather than systemwide auditing, you can limit the auditing output to a manageable amount. You may also decide to turn on auditing only if you encounter questionable activity in the database.

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In order for you to audit any user activity within the database, and even attempt to log into the database, you need to enable auditing by specifying the AUDIT_TRAIL parameter in your init.ora file. Audit records contain the audit information, such as the audited user, the type of operation, and the date and time of the operation, and the AUDIT_TRAIL parameter specifies what is done with these records. The parameter can take the following values: NONE: Disables database auditing. NONE is the default value for this parameter. OS: Specifies that Oracle will write the audit records to an operating system file (operating system audit trail). DB: Specifies that Oracle will write the audit records to the database audit trail, viewable as DBA_AUDIT_TRAIL (stored in the SYS.AUD$ table). DB, EXTENDED: Specifies that Oracle will send all audit records to the database audit trail (SYS.AUD$), and in addition, populates the SQLBIND and SQLTEXT CLOB columns. XML: Specifies database auditing, with the XML-format audit records going to the OS files. XML, EXTENDED: Same as the XML setting, but also records all audit-trail columns, including SQLTEXT and SQLBIND. There is a default location in which Oracle will place the audit file, and you can easily change the location of this file by using the AUDIT_FILE_DEST parameter in the init.ora file, as shown here: AUDIT_TRAIL=DB AUDIT_FILE_DEST=/a10/app/oracle/oradata/audit_data

We re using a B*Tree index, and our predicate does not use the leading edge of an index In this case, we might have a table T with an index on T(x,y) We query SELECT * FROM T WHERE Y = 5 The optimizer will tend not to use the index since our predicate did not involve the column X it might have to inspect each and every index entry in this case (we ll discuss an index skip scan shortly where this is not true) It will typically opt for a full table scan of T instead That does not preclude the index from being used.

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