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