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You can therefore check the success of the recovery by querying this view after RMAN completes its recovery If you think you have extensive database block corruption and you aren t sure whether the preceding method will successfully recover the data, the best course of action is to first get in touch with Oracle Worldwide Support, which has access to specialized tools that can help you extract data from corrupt data blocks Oracle may charge you extra for these services, but if your data is critical, it may be well worth the expense..

Listing 18-7. The SQL Ordered by Elapsed Time Section of an AWR Report SQL ordered by Elapsed Time DB/Inst: ORCL/orcl Snaps: 3309-3313 -> Resources reported for PL/SQL code includes the resources used by all SQL statements called by the code. -> % Total DB Time is the Elapsed Time of the SQL statement divided into the Total Database Time multiplied by 100 Elapsed CPU Elap per % Total Time (s) Time (s) Executions Exec (s) DB Time SQL Id ---------- ---------- ------------ ---------- ------- ------------15,970 3,769 24 665.4 3.3 dvycj85pfmb1b Module: PRNTREPORT UPDATE UNIT_USERS UR SET UR.CARD_PRINTED_FLAG = 'Y' WHERE UR.CHARTER_ID IN (SELECT DISTINCT CHARTER_ID FROM PS_LASER_CARDS WHERE BATCH_ID = :B1 ) AND UR.P OSNTYP_CODE IN ('V','M','O') AND UR.POSN_CODE NOT IN ('AP','IH') AND UR.REGISTRA NT_STATUS IN ('X','R','N') AND UR.CARD_PRINTED_FLAG = 'N' Operating system statistics are listed next: Operating System Statistics Statistic Name Value ----------------------------------- -----------------AVG_BUSY_TICKS 989,293 AVG_IDLE_TICKS 1,971,976 AVG_IOWAIT_TICKS 125,186 AVG_SYS_TICKS 447,993 AVG_USER_TICKS 540,353 BUSY_TICKS 15,845,441 IDLE_TICKS 31,567,835 The Segments by Physical Reads section, shown in Listing 18-8, lists the database objects (tables and indexes) that have the highest percentage of physical reads. Listing 18-8. The Segments by Physical Reads Section of an AWR Report Segments by Physical Reads DB/Inst: ORCL/orcl Snaps: 3309-3313 Tablespace Subobject Obj. Physical Owner Name Object Name Name Type Reads %Total ---------- ---------- -------------------- ---------- ----- ------------ ------PAS UNIT_REGIS UNIT_REGISTRANTS TABLE 18,003,616 21.08 PAS CAMPAIGN_P CAMPAIGN_POSITIONS TABLE 15,319,556 17.94 PAS OT_D01 PAYMENT_CATEGORY_BAT TABLE 11,799,007 13.81 PAS PERSONNEL_D PERSONNEL TABLE 7,189,914 8.42 ------------------------------------------------------------------------. . . End of Report

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While you re recovering databases, the recovery process may encounter corrupt data blocks somewhere along the line. When a situation like this occurs, the recovery process will stop, leaving the database in a consistent state. Although it s possible to recover the database to a point before the corruption occurred, this could be a time-consuming process. To determine the extent of the damage before you start recovery, you can use a trial recovery. Depending on the amount of corruption you find, you can then decide whether you ll use an incomplete recovery or continue recovery beyond the corrupted block by using the ALLOW n CORRUPTION recovery option. For example, if you want to ignore a minor amount of corruption, you can use the following command, which can find one corrupt data block yet continue the recovery process: SQL> RECOVER DATABASE ALLOW 1 CORRUPTION; Trial recovery lets you simulate the recovery process it neither performs a real recovery nor fixes data corruption. It lets you know whether there is corruption and, if there is, the extent of the corruption. Trial recovery proceeds in the same way as real data recovery by applying the redo changes. However, trial recovery changes the data blocks only in memory, not permanently on disk. After the test, it rolls back all its changes, leaving only the possible error messages in the alert log file.

I only highlighted a few of the categories of information contained in a typical AWR report. Run the awrrpt.sql script to get a full picture of your instance performance over a specified period of time. In addition to the information listed previously, you get important wait information, as well as detailed logical and physical reads analysis based on SQL statements and on a per-data-file basis.

Here are the typical trial recovery commands: SQL> RECOVER DATABASE UNTIL CANCEL TEST; ORA-10574: Test recovery did not corrupt any data block ORA-10573: Test recovery tested redo from change 9948095 to 9948095 ORA-10570: Test recovery complete /* The following statement would recover a tablespace */ SQL> RECOVER TABLESPACE users TEST;

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