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TNS-12518: TNS:listener could not hand off client connection
 TNS-12560: TNS:protocol adapter error
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select a.dname, b.ename from dept a, emp b where a.deptno=b.deptno and a.deptno=10;
select a.dname, b.ename from dept a inner join emp b
on a.deptno=b.deptno and a.deptno=10;
select dname,ename from dept natural ......

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SELECT osuser, username, sql_text from v$session a, v$sqltext b where a.sql_address =b.address order by address, piece;
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