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For example, suppose you want to reclassify a skill by giving it a different Skill ID In this case, you have the headache of ensuring that you make the change for every employee who has this skill If you miss some of the employees, you ll end up with several employees having the same skill under different IDs this is an update anomaly If only one employee has a certain skill, and this employee happens to leave the organization, that employee s data will be removed from the database, and the skill will disappear entirely from your database this is a delete anomaly To avoid problems such as these, you must put your tables in 2NF Break down the table into simpler versions to get rid of any partial key dependencies That is, all non-key attributes should be fully functionally dependent on the primary key.

The flash recovery area is an area reserved for all Oracle backup and recovery-related files, and it contains copies of current control files and online redo logs, as well as archived redo logs, flashback logs, and RMAN backups The flash recovery area is completely separate from the database area, which is the location for the current database files (data files, control files, and online redo logs) The flash recovery area isn t mandatory, but Oracle strongly recommends using it to simplify backup and recovery operations You ll learn more about the flash recovery area in 16 The two parameters described next, DB_RECOVERY_FILE_DEST_SIZE and DB_RECOVERY_FILE_DEST, are used to configure the flash recovery area..

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In order to do this, you must separate the attributes that depend on both parts of the key from those that depend only on the Skill ID This results in two tables: the Skills table, which lists the name for each Skill ID, and the Employee Skills table, which lists the skills actually learned by each employee (see Tables 2-5 and 2-6) In the Employee Skills table, the Skill Level attribute is clearly dependent on both parts of the key, since the attribute is based not only on which particular skill is being referred to, but also on the particular employee s level in that skill..

The DB_RECOVERY_FILE_DEST_SIZE parameter specifies (in bytes) the size of the flash recovery area. Default value: None Parameter type: Dynamic. The ALTER SYSTEM command can be used to change the value.

You must substitute VERSIONS BETWEEN TIMESTAMP . . . for the VERSIONS BETWEEN SCN nn AND nn clause to use time stamps to specify the time interval for retrieving the various versions of a row instead of using SCNs.

The DB_RECOVERY_FILE_DEST parameter specifies the default location for the flash recovery area. If you don t specify DB_CREATE_ONLINE_LOG_DEST_n when using OMF files, Oracle uses the location you specify for the DB_RECOVERY_FILE_DEST parameter as the default location for online redo log files and control files. Default value: None Parameter type: Dynamic. The ALTER SYSTEM command can be used to change the value.

Here are the main limitations of the Flashback Versions Query feature: You can only use the feature to query actual tables, not views. You can t apply the VERSIONS clause across DDL operations. The query will ignore purely physical row changes as happen, for example, during a segment shrink operation. You can t use this feature if you re dealing with external or temporary tables. If you want to query past data at a precise time, you must use an SCN, since the actual time might be up to three seconds earlier or later than the time you specify with a time stamp. Oracle Database 11g uses SCNs internally and maps them to time stamps with a granularity of three seconds. This potential gap between an SCN and a time stamp may cause problems when you re trying to flash back to an exact time that immediately follows a DDL operation. Suppose you created a new table. If you use a time stamp, your Flashback Versions Query might start a little before the exact time the table was created and miss the new table entirely. You ll end up with an error in this case instead of the Flashback Version Query results. By using an SCN instead of a time stamp, you can avoid this problem.

The FLASHBACK_TRANSACTION_QUERY view lets you identify which transaction or transactions were responsible for a certain change in a table s data during a specified interval. A Flashback Transaction Query is simply a query on the FLASHBACK_TRANSACTION_QUERY view, and it can provide transaction information, including the SQL statements needed to undo all the changes made by either a single transaction or a set of transactions during a specified interval of time. This feature enables you not only to correct logical errors, but also to conduct transaction audits in your database.

Note You must set the DB_RECOVERY_FILE_DEST_SIZE parameter in order to set the DB_RECOVERY_FILE_ DEST parameter. If you want to use the Flashback Database feature (explained in 16), you must also use the DB_FLASHBACK_RETENTION_TARGET parameter.

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