The database server is configured to handle a certain number of open tblspaces (which correspond approximately to tables). This limit has been reached, so a table that is used in this statement could not be opened. In the short term, roll back the current transaction and then re-execute it when fewer concurrent operations are going on. To prevent recurrence, the database server administrator should configure the system to handle more open tblspaces. The TBLSPACES parameter of the ONCONFIG file sets the limit. The ovrtable count in the ON-Monitor or ON-Monitor Profile display reflects the number of times this error occurs.