Oracle : Ошибка ORA-10621

"specify retry count for online index build cleanup DML lock get"
*Action: set this event only under the supervision of Oracle development
*Comment: Change the behaviour of online index build cleanup such that
a failed DML lock get will be reattempted. The number of retries
is dictated by the event level. Note that an event level of 1
means try forever. Any other event level specifies the number
of attempts, and is internally increased to some minimum default.

Попробовать перевести

Поискать эту ошибку на форуме