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The first command in the figure launches the RMAN executable, from an operating system prompt The connection succeeds, but RMAN reports that the database is not open The second command lists all current failures: there is one nonsystem datafile missing If this step were omitted, the next step would not return anything The third command generates advice on fixing the failure The first suggestion is that some error by the system administrators could be responsible for the problem and could be fixed manually Then there is an automatic repair involving restore and recovery This is in the form of an RMAN script The contents of the script (not shown in the figure) were

# restore and recover datafile restore datafile 4; recover datafile 4;

Figure 1-1

repair failure;

Following this, the database can be opened TIP The DRA works, but you can often do better For example, it does not generate scripts that will minimize downtime by opening the database before doing the restore and recovery (which would be possible in the example) On connecting with Database Control to a damaged database, there will always be a button named PERFORM RECOVERY Figure 16-3 shows the window this will produce for the same situation shown in Figure 16-2

Figure 16-3

Figure 1-2

.

The Information section seen in Figure 16-3 shows that there is one failure, and that the database is mounted The ADVISE AND RECOVER button will launch a wizard that will list details of the failure, generate the repair script, and then submit it as a job to the Enterprise Manager job system, and finally prompt you to open the database EXAM TIP The DRA will not generate any advice if you have not first asked it to list failures Any failures occurring since the last listing, or fixed since the last listing, will not be advised upon The DRA can generate scripts to restore a missing or damaged controlfile copy and to rebuild a missing online log file group and to restore and recover missing or damaged datafiles It will not take any action if a member of a multiplexed log file group is damaged Exercise 16-2: Repair a Fault with the DRA In this exercise, you will diagnose and repair the problem caused in Exercise 16-1 using Database Control 1 Using a browser, attempt to connect to Database Control This will present a window stating that the database is mounted, with buttons for STARTUP and PERFORM RECOVERY 2 Click STARTUP Enter operating system and database credentials and follow the prompts to open the database This will fail, so click PERFORM RECOVERY 3 In the Perform Recovery window, click ADVISE AND REPAIR to enter the DRA Wizard 4 In the View And Manage Failures window, click ADVISE 5 In the Manual Actions window, click CONTINUE WITH ADVICE 6 In the Recovery Advice window, observe the script and click CONTINUE 7 In the Review window, click SUBMIT RECOVERY JOB 8 When the job completes, use either Database Control or SQL*Plus to open the database It is possible that Database Control will have gotten confused as a result of this exercise, and may have trouble determining what state the database is in If this appears to be the case, close the browser and restart the Database Control processes from an operating system prompt with the commands:.

emctl stop dbconsole; emctl start dbconsole;

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Some files are critical Damage to a critical file will mean that the database instance will terminate if it is open, and cannot be reopened until the damage is repaired Other files are noncritical: if these are damaged, the database can remain open or be opened if it is closed In either case, there is no reason to lose data: you should be able to perform a complete recovery from any form of damage, provided that you