FILE_IOSTAT

FILE_IOSTAT records statistics about data file I/Os to indicate I/O performance and detect performance problems such as abnormal I/O operations.

Table 1 FILE_IOSTAT columns

Name	Type	Description
filenum	oid	File identifier
dbid	oid	Database ID
spcid	oid	Tablespace ID
phyrds	bigint	Number of times of reading physical files
phywrts	bigint	Number of times of writing into physical files
phyblkrd	bigint	Number of times of reading physical file blocks
phyblkwrt	bigint	Number of times of writing into physical file blocks
readtim	bigint	Total duration of reading (unit: μs)
writetim	bigint	Total duration of writing (unit: μs)
avgiotim	bigint	Average duration of reading and writing (unit: μs)
lstiotim	bigint	Duration of the last file reading (unit: μs)
miniotim	bigint	Minimum duration of reading and writing (unit: μs)
maxiowtm	bigint	Maximum duration of reading and writing (unit: μs)