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Oracle® Database Reference
11g Release 2 (11.2)

Part Number E17110-04
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V$ASM_DISK_IOSTAT

V$ASM_DISK_IOSTAT displays information about disk I/O statistics for each ASM client. If this view is queried from the database instance, only the rows for that instance are shown.

Column Datatype Description
INSTNAME VARCHAR2(64) Identifier for the DB/ADVM instance client
DBNAME VARCHAR2(8) Unique database name (DB_UNIQUE_NAME)
GROUP_NUMBER NUMBER Number of the disk group containing the disk
DISK_NUMBER NUMBER Number assigned to the disk within its disk group
FAILGROUP VARCHAR2(30) Name of the failure group to which the disk belongs
READS NUMBER Total number of I/O read requests for the disk
WRITES NUMBER Total number of I/O write requests for the disk
READ_ERRS NUMBER Total number of failed I/O read requests for the disk
WRITE_ERRS NUMBER Total number of failed I/O write requests for the disk
READ_TIME NUMBER Total I/O time (in seconds) for read requests for the disk if the TIMED_STATISTICS initialization parameter is set to TRUE (0 if set to FALSE).
WRITE_TIME NUMBER Total I/O time (in seconds) for write requests for the disk if the TIMED_STATISTICS initialization parameter is set to TRUE (0 if set to FALSE)
BYTES_READ NUMBER Total number of bytes read from the disk
BYTES_WRITTEN NUMBER Total number of bytes written from the disk
HOT_READS NUMBER Number of reads from the hot region on disk
HOT_WRITES NUMBER Number of writes to the hot region on disk
HOT_BYTES_READ NUMBER Number of bytes read from the hot region on disk
HOT_BYTES_WRITTEN NUMBER Number of bytes written to the hot region on disk
COLD_READS NUMBER Number of reads from the cold region on disk
COLD_WRITES NUMBER Number of writes to the cold region on disk
COLD_BYTES_READ NUMBER Number of bytes read from the cold region on disk
COLD_BYTES_WRITTEN NUMBER Number of bytes written to the cold region on disk