When I was testing the virtual indexes for the previous post, I got ORA-12838 from the subsequent select after inserting 4 million rows without commit (I mean I forgot committing). The error was
ORA-12838: cannot read/modify an object after modifying it in parallel
The error documentation says ;
Cause: Within the same transaction, an attempt was made to add read or modification statements on a table after it had been modified in parallel or with direct load. This is not permitted.
Action: Rewrite the transaction, or break it up into two transactions: one containing the initial modification and the second containing the parallel modification operation.
Action was not clear for me. When I look at the code I saw that there wasnt any commit when i committed the transaction the error solved.
As a main idea for the blog entry “look twice to your code before taking an action”