oracle - ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired -

oracle - ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired -

why getting database error when update table?

error @ line 1: ora-00054: resource busy , acquire nowait specified or timeout expired

your table locked query. have executed "select update" , has yet not committed/rollback , 1 time again fired select query. commit/rollback before executing query.

oracle ora-00054