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The dynamic performance view V$SESSION_LONGOPS isn t specific to RMAN either Oracle records any operations that run for more than six seconds (in absolute time), including RMAN backup and recovery operations, statistics gathering, and long queries in V$SESSION_LONGOPS RMAN populates two different types of rows in V$SESSION_LONGOPS: detail rows and aggregate rows Detail rows contain information about a single RMAN job step, such as creating a single backup set Aggregate rows apply to all files referenced

in a single RMAN command, such as BACKUP DATABASE As you might expect, aggregate rows are updated less frequently than detail rows EXAM TIP The initialization parameter STATISTICS_LEVEL must be set to TYPICAL or ALL before the view V$SESSION_LONGOPS will contain information about long-running RMAN jobs The default value for STATISTICS_LEVEL is TYPICAL This example initiates a full database backup, and while the backup is running, both detail and aggregate rows for active RMAN jobs are shown:

SQL> 2 3 4 5 select sid, serial#, opname, sofar, totalwork from v$session_longops where opname like 'RMAN%' and sofar <> totalwork ;

Figure 7-1

SID SERIAL# OPNAME SOFAR TOTALWORK ------- ---------- --------------------------------- ---------130 39804 RMAN: aggregate output 97557 0 94 47546 RMAN: aggregate input 191692 331808 155 1196 RMAN: full datafile backup 219980 331808 155 1196 RMAN: full datafile backup 121172 0 SQL>

The SID and SERIAL# are the same columns you see in V$SESSION The OPNAME column is a text description of the operation monitored in the row, and for RMAN, it contains the prefix RMAN: The column SOFAR is, as you might expect, a measure of the progress of a step Its value differs depending on the type of operation: For image copies, it is the number of blocks read For backup input rows, it is the number of blocks read from the files being backed up For backup output rows (backup set or image copy), it is the number of blocks written so far to the backup piece For restore operations, it is the number of blocks processed so far to the destination files For proxy copies (copy operations from a media manager to or from disk), it is the number of files that have been copied so far The column TOTALWORK has a similar definition, except that it estimates the total amount of work required during the step: For image copies, it is the total number of blocks in the file For backup input rows, it is the total number of blocks to be read from all files in the step

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For backup output rows, it is always zero because RMAN does not know how many blocks will be written into a backup piece until it is done For restore operations, it is the total number of blocks in all files restored in a single job step or aggregate For proxy copies, it is the total number of files to be copied in the job step To calculate the progress of an RMAN step as a percentage, you can divide SOFAR by TOTALWORK as follows and add this expression to the SELECT statement:

round(sofar/totalwork*100,1)