One of the users session executed a batch job.
It was waiting for something.. it seems.

When I trace with 10046 I found the below kind of entries repeatedly.

WAIT #60: nam='global cache cr request' ela= 104 p1=48 p2=637609 p3=4398344284048
WAIT #60: nam='db file sequential read' ela= 11330 p1=48 p2=637609 p3=1
WAIT #60: nam='db file sequential read' ela= 18399 p1=48 p2=608205 p3=1
WAIT #60: nam='db file sequential read' ela= 11707 p1=48 p2=608255 p3=1
WAIT #60: nam='global cache cr request' ela= 112 p1=48 p2=637625 p3=4398367593600
WAIT #60: nam='db file sequential read' ela= 11856 p1=48 p2=637625 p3=1
WAIT #60: nam='global cache cr request' ela= 131 p1=48 p2=637652 p3=4398359511392
WAIT #60: nam='db file sequential read' ela= 6253 p1=48 p2=637652 p3=1


We do not find any blocking locks.

V$sessionwait is

SEQ# EVENT P1TEXT P3 WAIT_TIME SECONDS_IN_WAIT STATE

46114 db file sequential read file# 1 0 0 WAITING

like above repeatedly.
Only the sequence number is changing.

In this situation where to look and how to identify the issue.

One other user who ran another batch job completed after 3 hours.
Now this job is finished.

RAC environment, oracle 9i linux 2.1

Thanks