High Wait for 'Latch: Query Server Process' and 'DFS Lock Handle'
(Doc ID 1663500.1)
Last updated on AUGUST 04, 2018
Applies to:
Oracle Database - Enterprise Edition - Version 11.1.0.6 to 12.2.0.1 [Release 11.1 to 12.2]Information in this document applies to any platform.
Symptoms
Queries running slow with high waits for 'latch: query server process' and 'DFS lock handle'
Top 10 Foreground Events by Total Wait Time
| Event | Waits | Total Wait Time (sec) | Wait Avg(ms) | % DB time | Wait Class |
|---|---|---|---|---|---|
| DFS lock handle | 1,336 | 29.4K | 22043 | 52.3 | Other |
| latch free | 6,200 | 25.7K | 4137 | 45.5 | Other |
| DB CPU | 463.3 | .8 |
Latch Activity
| Latch Name | Get Requests | Pct Get Miss | Avg Slps /Miss | Wait Time (s) | NoWait Requests | Pct NoWait Miss |
|---|
| query server process | 80,297 | 4.01 | 2.68 | 25830 | 2,104 | 0.29 |
Changes
Table or index degree of parallelism has been altered.
Cause
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