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Oracle® Database Reference
11g Release 2 (11.2)

E40402-12
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V$BACKUP_SYNC_IO

V$BACKUP_SYNC_IO displays performance information about ongoing and recently completed RMAN backups and restores. For each backup, it contains one row for each input datafile, one row for the aggregate total performance of all datafiles, and one row for the output backup piece. This data is not stored persistently, and is not preserved when the instance is re-started.

See Also:

Oracle Database Performance Tuning Guide for information on how to use this table to tune backup performance
Column Datatype Description
SID NUMBER The Oracle SID of the session doing the backup or restore
SERIAL NUMBER The use count for the SID doing the backup or restore
USE_COUNT NUMBER A counter that can be used to identify rows from different backup sets
RMAN_STATUS_RECID NUMBER Owning V$RMAN_STATUS record ID
RMAN_STATUS_STAMP NUMBER Owning V$RMAN_STATUS record stamp
DEVICE_TYPE VARCHAR2(17) The device type where the file is located
TYPE VARCHAR2(9) INPUT, OUTPUT, or AGGREGATE
STATUS VARCHAR2(11) NOT STARTED, IN PROGRESS, or FINISHED
FILENAME VARCHAR2(513) The name of the backup file being read or written
SET_COUNT NUMBER The set count of the backup set being read or written
SET_STAMP NUMBER The set stamp of the backup set being read or written
BUFFER_SIZE NUMBER The size of the buffers being used to read/write this file, in bytes
BUFFER_COUNT NUMBER The number of buffers being used to read/write this file
TOTAL_BYTES NUMBER The total number of bytes that will be read or written for this file, if known. If not known, this column will be null.
OPEN_TIME DATE The time this file was opened. If TYPE='AGGREGATE', then this is the time that the first file in the aggregate was opened.
CLOSE_TIME DATE The time this file was closed. If TYPE='AGGREGATE', then this is the time that the last file in the aggregate was closed.
ELAPSED_TIME NUMBER The time, in hundredths of a second, that the file was open
MAXOPENFILES NUMBER The number of concurrently open DISK files. This value is only present in rows where TYPE='AGGREGATE'.
BYTES NUMBER The number of bytes read or written so far
EFFECTIVE_BYTES_PER_SECOND NUMBER The I/O rate that was achieved with this device during this backup
IO_COUNT NUMBER The number of I/Os that were performed to this file
IO_TIME_TOTAL NUMBER The total time, in hundredths of a second, taken to do I/O for this file
IO_TIME_MAX NUMBER The maximum time taken for a single I/O request
DISCRETE_BYTES_PER_SECOND NUMBER The average transfer rate for this file