Updated on 2023-10-23 GMT+08:00

SUMMARY_FILE_IOSTAT

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

Table 1 SUMMARY_FILE_IOSTAT columns

Name

Type

Description

filenum

oid

File ID

dbid

oid

Database ID

spcid

oid

Tablespace ID

phyrds

numeric

Number of times of reading physical files

phywrts

numeric

Number of times of writing into physical files

phyblkrd

numeric

Number of times of reading physical file blocks

phyblkwrt

numeric

Number of times of writing into physical file blocks

readtim

numeric

Total duration of reading (unit: μs)

writetim

numeric

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)