ORA-12838: cannot read/modify an object after modifying it in parallel

Problem Description
SQL> INSERT /*+APPEND NOLOGGING */ INTO STATION_RATE(ID,COUNTRY,CODE,PURCHASE_RATE,STATION_ID) SELECT
ID.NEXTVAL, COUNTRY,CODE,PURCHASE_RATE, 4 from STATION_RATE_DUMMY;

7561 rows created.

SQL> INSERT /*+APPEND NOLOGGING */ INTO STATION_RATE(ID,COUNTRY,CODE,PURCHASE_RATE,STATION_ID) SELECT
ID.NEXTVAL, COUNTRY,CODE,PURCHASE_RATE, 5 from STATION_RATE_DUMMY;
INSERT /*+APPEND NOLOGGING */ INTO STATION_RATE(ID,COUNTRY,CODE,PURCHASE_RATE,STATION_ID) SELECT
*
ERROR at line 1:
ORA-12838: cannot read/modify an object after modifying it in parallel

Cause of the Problem
A table is modified in parallel or with direct path load in a transaction. Now within the same transaction if an attempt was made to read or modification statements on a table then ORA-12838 will occur. In oracle within same transaction table is modified with direct path load or parallel and then access of it is not permitted.

Solution of the Problem
Break up the transaction into two or rewrite the transaction. You can break the transaction into two simply after doing a commit after direct path load or parallel modification of the table.

SQL> commit;

Commit complete.

SQL> INSERT /*+APPEND NOLOGGING */ INTO STATION_RATE(ID,COUNTRY,CODE,PURCHASE_RATE,STATION_ID) SELECT
ID.NEXTVAL, COUNTRY,CODE,PURCHASE_RATE, 5 from STATION_RATE_DUMMY;

7561 rows created.

As now data is loaded direct path load so we can't read data from the table unless we do a commit.

SQL> select count(*) from station_rate;
select count(*) from station_rate
*
ERROR at line 1:
ORA-12838: cannot read/modify an object after modifying it in parallel


SQL> commit;

Commit complete.

SQL> select count(*) from station_rate;

COUNT(*)
----------
53228
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