DBA_HIST_IOSTAT_FILETYPE

DBA_HIST_IOSTAT_FILETYPE displays historical I/O statistics by file type. This view contains snapshots of V$IOSTAT_FILE.

Column	Datatype	NULL	Description
`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