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SQL's waiting on PGA Memory Operation Wait Event after upgrade to 18c from 11g (Doc ID 2797910.1)

Last updated on FEBRUARY 26, 2022

Applies to:

Oracle Database - Enterprise Edition - Version 18.0.0.0 and later
Information in this document applies to any platform.

Symptoms

Observing SQL regression after upgrade from 11g to 18c:

PARSING IN CURSOR #18446744071518379408 len=67 dep=0 uid=0 oct=3 lid=0 tim=6560067078442 hv=2483881129 ad='700000040e9e09c0' sqlid='5tu9x66a0u159'
select * from NCLSEA.NCL_RV_GUEST_AIR_HOTEL where res_id='45749915'
END OF STMT
PARSE #18446744071518379408:c=74097119,e=74430409,p=205,cr=9648,cu=0,mis=1,r=0,dep=0,og=1,plh=2560096544,tim=6560067078440
WAIT #18446744071518379408: nam='PGA memory operation' ela= 40 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067079276
WAIT #18446744071518379408: nam='PGA memory operation' ela= 10 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067079581
WAIT #18446744071518379408: nam='PGA memory operation' ela= 9 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067079795
WAIT #18446744071518379408: nam='PGA memory operation' ela= 10 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067079988
WAIT #18446744071518379408: nam='PGA memory operation' ela= 9 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067080168
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067080341
WAIT #18446744071518379408: nam='PGA memory operation' ela= 8 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067080506
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067080670
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067080825
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067080980
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067081143
WAIT #18446744071518379408: nam='PGA memory operation' ela= 8 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067081310
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067081473
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067081632
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067081799
WAIT #18446744071518379408: nam='PGA memory operation' ela= 8 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067081960
WAIT #18446744071518379408: nam='PGA memory operation' ela= 6 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067082125
WAIT #18446744071518379408: nam='PGA memory operation' ela= 7 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067082283
WAIT #18446744071518379408: nam='PGA memory operation' ela= 6 p1=65536 p2=1 p3=0 obj#=3282254 tim=6560067082439

Changes

 Upgrade from 11g to 18c

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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