CHECK THE SESSIONS ACCESSING TABLE OBJECTS IN ORACLE
If you want to see the sessions which currently access a particular object like table,index etc.. you can use v$access view to see both read and write operations performed by an user or application session
kish@exdbx<>select * from v$access where OBJECT='TABX' and TYPE='TABLE';
SID OWNER OBJECT TYPE
---------- ---------------------------------------------------------------- --------------- ----------------------------------------------------------------
54 TEST TABX TABLE
Alternatively if someone executes a write operation like insert or update on a table, then you can use v$locked_objects
kish@exdbx<>select * from v$locked_object;
XIDUSN XIDSLOT XIDSQN OBJECT_ID SESSION_ID ORACLE_USERNAME OS_USER_NAME PROCESS LOCKED_MODE
---------- ---------- ---------- ---------- ---------- --------------- --------------- ------------------------ -----------
6 27 1928 89028 54 TEST kisha 12520:20912 3