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I opened only ONE window and run
1 begin
2 for i in 1..100000 loop
3 insert into t values(i);
4 commit;
5 end loop;
6* end;
and at another window i query v$session_wait.
i found that event like :
log file parallel write
db file sequential read
why db file sequentila read happen, why system need to read db file?
guru is on the way!!!!
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