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You can use OEM to help you correctly size your undo tablespace and set the right UNDO_RETENTION parameter value. OEM provides the Undo Advisor to help you determine the space required for your undo tablespace, based on average and peak-level undo generation rates. To get to the Undo Advisor page, go to the OEM Home Page Advisor Central Undo Management and click on the Undo Advisor button. (You can also get to the Undo Advisor by going to the OEM Home Page Performance Page Advisor Central Undo Management and clicking on the Undo Advisor button.) The Undo Advisor shows you the best undo retention possible for a given undo tablespace size. It can also advise you about the correct size for the undo tablespace, based on an undo retention value that you specify, by analyzing the impact of various hypothetical undo retention values. You can also use the Undo Management page (OEM Home Page Administration Instance Undo Management) to perform the following tasks: Change and edit the undo tablespace View system activity and undo tablespace usage statistics, including the average and maximum undo generation rates and the length (in minutes) of the longest running query Get recommendations for both undo retention length and undo tablespace size Figure 6-2 shows the Undo Generation Rate and Tablespace Usage graph from the bottom of the OEM Undo Management page. This graph is color-coded so you can see at a glance how the undo tablespace is handling the amount of undo information generated in your instance.

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To lock the account, we will construct and run an ed script that modifies the passwd or shadow file. First we remove any existing ed scripts created from previous runs.

Up until the Oracle9i database version, the only way to correct user errors was to perform point-intime recovery, which is tedious and somewhat complex. The Oracle9i database introduced the first Flashback features in the database. Flashback features enable you to query past versions of data, as well as retrieve the history of changes made to a table s data. You can use the historical information either to query past data or to recover from logical corruption in the data. Oracle Database 10g provides several error-correction techniques that depend on undo data. However, all these great features are only available if you use Automatic Undo Management. The following Flashback features in Oracle Database 10g depend on undo data: Flashback Query: Retrieves data from a past point in time. Flashback Versions Query: Shows you the different versions of table rows, and provides metadata, such as the start and end time of the particular transaction that created the row version. Flashback Transaction Query: Lets you retrieve historical data for a given transaction, along with the SQL code to undo the changes made to particular rows. Flashback Table: Recovers a table quickly to its state at a past point in time, without having to perform point-in-time recovery.

There are other flashback features, like Flashback Drop and Flashback Database, but they don t use undo data. I ll discuss these features in 16, which deals with database recovery.

If you want to make serious use of the new Flashback features, make sure that you provide sufficiently sized undo tablespaces. Preferably, you must use autoextensible undo tablespaces, so that Oracle retains undo data longer than the longest query duration. In addition, you should specify RETENTION GUARANTEE for the undo data. Simply setting a large UNDO_RETENTION value doesn t guarantee that Oracle won t discard unexpired undo data (as was discussed previously).

You can disable the warning or critical threshold tablespace alerts by setting the threshold values to zero.

C++ templates require special attention in mixed-code projects. Templates are typically defined in header files. Before you can use a template type, you have to include the header defining the template type and its members. When a template is used in a file that is compiled to native code, the member functions of the template type are compiled to native code, too. When a source file using a template is compiled to managed code, the template s members are compiled to managed code. When two source files in your project use the same template and both are compiled with different compilation models, the linker will get two variants of the template s functions: one compiled to managed code and one compiled to native code. In this case, it is up to the linker to decide which version should be chosen. To avoid unnecessary method calls across managed-unmanaged boundaries, the linker chooses the native variant of a function if the caller is a native function, and the managed variant if the caller is a managed function. This means that you will likely have both variants of the function in your DLL or EXE file. Sometimes it is argued that #pragma unmanaged should be used to ensure that a template is compiled to native code even though it is called from managed code. As mentioned before,

Once again, if the debug e-mail address has been set, we only append to the output file a report that the account is expired.