oracle - Query very slow after a few execution -


i'm new of oracle , i'm becoming crazy following situation. i'm working on oracle 11g database , many times happening run query sql developer , correctly executed in 5/6 seconds, others time instead same query take 300/400 second executed. there tools debug happening when query employs 300/400 second?

update 1 sql developer screenshot problem seems direct path read temp

enter image description here

update 2 report

update 3 report2

any suggestion?

try setting trace. user being whatever user experiencing delay
sys:

grant alter session user;

as user executing trace:

alter session set events '10046 trace name context forever, level 8'; alter session set tracefile_identifier = "my_test_session";

produce error/issue, user testing:

alter session set events '10046 trace name context off';

as system find out trace files kept:

show parameter background_dump_dest;

go directory , .trc/.trm files containing my_test_session. example orcl_ora_29772_my_test_session.trc.
after tkprof files. in linux:

tkprof orcl_ora_29772_my_test_session.trc output=orcl_ora_29772_my_test_session.tkprof explain=user/password sys=no

read tkprof file , will show wait times on given statements.
more info on tkprof read this. more info on enabling/disabling trace read this.


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