ORA-08177: can't serialize access for this transaction

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Reference

My Oracle Support Note : Insert Into Table Fails With ORA-08177 (Doc ID 160593.1)

Error Explanation

•symptom: Insert into table fails

•symptom: ORA-08177: can't serialize access for this transaction

•symptom: transaction isolation level is serializable

•symptom: The table has index definitions

•symptom: Several transaction insert data into same table

•cause: The problem manifest itself when there are indexes on the table   
 to which the rows are being inserted.  Without any indexes the problem will not reproduce     

Reproduce the error

First, as use robla, create the test objects:

SQL> create table emp2 as select * from emp where rownum < 1;

Table created.

SQL> create index emp2_indx on emp2(empno); 

Index created.

In two separate SQL sessions, as user robla, enter the following commands, i.e. type each individual command on one session followed immediately on the other session. (Do not connect as sys as you can't set the transaction isolation level as sys):

-- Session 1:
SQL_01> set transaction isolation level serializable;

Transaction set.

-- Sesssion 2:
SQL_02> set transaction isolation level serializable;