SNAP_ID

NUMBER

NOT NULL

Unique snapshot ID

DBID

NUMBER

NOT NULL

Database ID for the snapshot

INSTANCE_NUMBER

NUMBER

NOT NULL

Instance number for the snapshot

FILETYPE_ID

NUMBER

NOT NULL

Type of file (for example, log file, data file, and so on)

FILETYPE_NAME

VARCHAR2(30)

NOT NULL

Name of the file, in the case of a data file or temp file. For all other files, a corresponding string to be displayed (for example, ARCHIVELOG).

SMALL_READ_MEGABYTES

NUMBER

NOT NULL

Number of single block megabytes read

SMALL_WRITE_MEGABYTES

NUMBER

NOT NULL

Number of single block megabytes written

LARGE_READ_MEGABYTES

NUMBER

NOT NULL

Number of multiblock megabytes read

LARGE_WRITE_MEGABYTES

NUMBER

NOT NULL

Number of multiblock megabytes written

SMALL_READ_REQS

NUMBER

NOT NULL

Number of single block read requests

SMALL_WRITE_REQS

NUMBER

NOT NULL

Number of single block write requests

SMALL_SYNC_READ_REQS

NUMBER

NOT NULL

Number of synchronous single block read requests

LARGE_READ_REQS

NUMBER

NOT NULL

Number of multiblock read requests

LARGE_WRITE_REQS

NUMBER

NOT NULL

Number of multiblock write requests

SMALL_READ_SERVICETIME

NUMBER

NOT NULL

Total service time (in milliseconds) for single block read requests

SMALL_WRITE_SERVICETIME

NUMBER

NOT NULL

Total service time (in milliseconds) for single block write requests

SMALL_SYNC_READ_LATENCY

NUMBER

NOT NULL

Latency for single block synchronous reads (in milliseconds)

LARGE_READ_SERVICETIME

NUMBER

NOT NULL

Total service time (in milliseconds) for multiblock read requests

LARGE_WRITE_SERVICETIME

NUMBER

NOT NULL

Total service time (in milliseconds) for multiblock write requests

RETRIES_ON_ERROR

NUMBER

NOT NULL

Number of read retries on error

CON_DBID

NUMBER

The database ID of the PDB for the sampled session

CON_ID

NUMBER

The ID of the container that CON_DBID identifies. Possible values include:

• 0: This value is used for rows containing data that pertain to the entire CDB. This value is also used for rows in non-CDBs.

• 1: This value is used for rows containing data that pertain to only the root

• n: Where n is the applicable container ID for the rows containing data