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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

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

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