Studentconsulting lön flashback


studentconsulting lön flashback

undo and correct their errors. Calculating the space requirements is usually performed by a database administrator; you can find the calculation formula in the. Due to this time-to-SCN mapping, if you specify a time that is slightly after a DDL operation (such as a table creation) the database might actually use an SCN that is just before the DDL operation. You can also obtain the SQL code to undo the changes to particular rows affected by a transaction. You typically use Flashback Transaction Query in conjunction with a Flashback Version Query that provides the transaction IDs for the rows of interest. The DBA can use a Flashback Query to examine the contents of the table at 9:30, to find out what data had been lost.

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studentconsulting lön flashback

15 Using Flashback Features. This chapter discusses the following flashback topics. Database Administration Tasks Before Using Flashback Features. StudentConsulting rekrutterer og bemanner til verdensledende selskaper. Noen av våre medarbeidere.

They rely on undo data : records of the effects of individual transactions. When choosing whether to use a timestamp or an SCN in Flashback Query, remember that Oracle Database uses SCNs internally and maps these to timestamps at a granularity of 3 seconds. To do this, open the cursor before calling dbms_flashback. See Also:, Chapter "Using Flashback Drop and Managing the Recycle Bin for information on the Flashback Drop feature, Chapter "Recovering Tables Using the Flashback Table Feature for information on the Flashback Table feature, Chapter "Auditing Table Changes Using Flashback Transaction Query for information on Automatic. To enable flashback operations on specific LOB columns of a table, use the alter table command with the retention option. SQL alter tablespace users flashback ON; Tablespace altered. SQL alter database flashback ON; Database altered.

The version is that of the row that was inserted, deleted, or updated; that is, the row after an insert operation, the row before a delete operation, or the row affected by an update operation. Flashback Query always uses the cost-based optimizer, which relies on these statistics. If you use a timestamp, the actual time queried might be up to 3 seconds earlier than the time you specify. It returns committed data that was current at that point in time.


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