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)

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