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Three flashback techniques are based on the use of undo segments The first flashback capability was initially introduced with release 9i of the database and has been substantially enhanced subsequently Flashback Query (the release 9i feature) lets you query the database as it was at some time in the past, either for one select statement or by taking your session temporarily back in time so that all its queries will be against a previous version of the database This can be used to see the state of the data before a set of transactions was committed What did the tables look like half an hour ago This can be invaluable in tracking down the cause of business data corruptions, and can also be used to correct some mistakes: by comparing the current and previous versions of a table, you can identify what was done that was wrong It is even possible to select all versions of a row over a period of time, to show a history of what has happened to the row, when it happened, who did it, and the identifiers of the transactions that made each change Flashback Transaction automates the repair process Once you have used Flashback Query to identify which transaction it was that caused the problem, Oracle can construct SQL statements that will reverse the changes This is not the same as rolling back a committed transaction! It is impossible to roll back a committed change, because the rules of a relational database do not permit this But it is possible to construct another transaction that will reverse the effect of the first, erroneous transaction Unlike Flashback Database, Flashback Transaction does not imply data loss: all other work done remains in effect, and the database stays current The third flashback technique based on undo data is Flashback Table Having determined that inappropriate work has been committed against one table, you can instruct Oracle to reverse all changes made to that table since a particular point in time, while leaving all other tables current Throughout any Flashback Query, Transaction, or Table operation, the database remains open and all objects (including those involved in the flashback) are available for use Transactional integrity and constraints are always enforced, which means that the flashback operation might fail For example, if a flashback of a transaction requires an insert into a primary key column, that value must not be in use Flashing back one table may not be possible if it has foreign key constraints you will have to flash back all the related tables in one operation EXAM TIP Flashback query, in its three variations, relies on the use of UNDO segments. barcode font in vb.net Barcode generation scan free for ASP.NET aspx, Visual C#, Java ...
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Dec 12, 2018 · (the other printer I mentioned had vb.net examples available and it was really easy to achieve results ... Also, you can use Zebra designer to export your label format to the printer. .... Element name of the barcode is Barcode1. capability, the only way to get a table back after a drop would be to do an incomplete recovery to the point in time just before the table was dropped This was usually timeconsuming, and it meant the loss of all work done subsequently The new Flashback Database capability achieves the same result as incomplete recovery and should be much faster, but work done on other tables following the drop is lost and the database will be unavailable until the operation is completed Flashback Drop lets you reinstate the table as it was at the time that it was dropped, with no loss of data whatsoever; the database remains current This does not require any use of backups, and neither is there any downtime for users Note that Flashback Drop is specifically for the DROP command; you cannot flash back a TRUNCATE command Along with the table itself, any associated indexes and permissions will also be restored EXAM TIP You cannot flash back a table truncation, only a table drop 7 dynamically generate and display barcode image in asp net How to make Barcode in vb . net - CodeProject
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