High Wait for 'Latch: Query Server Process' and 'DFS Lock Handle' (Doc ID 1663500.1)

Last updated on FEBRUARY 02, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 11.1.0.6 to 12.1.0.2B1 [Release 11.1 to 12.1]
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

EventWaitsTotal Wait Time (sec)Wait Avg(ms)% DB timeWait 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 RequestsPct Get MissAvg Slps /MissWait Time (s)NoWait RequestsPct 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

Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms