How to solve : SQL Error: ORA-00604: error occurred at recursive SQL level 1

问题

When I'm trying to drop table then I'm getting error

SQL Error: ORA-00604: error occurred at recursive SQL level 2
ORA-01422: exact fetch returns more than requested number of rows
00604. 00000 -  "error occurred at recursive SQL level %s"
*Cause:    An error occurred while processing a recursive SQL statement
           (a statement applying to internal dictionary tables).
*Action:   If the situation described in the next error on the stack
           can be corrected, do so; otherwise contact Oracle Support.

回答1:

One possible explanation is a database trigger that fires for each DROP TABLE statement. To find the trigger, query the _TRIGGERS dictionary views:

select * from all_triggers
where trigger_type in ('AFTER EVENT', 'BEFORE EVENT')

disable any suspicious trigger with

   alter trigger <trigger_name> disable;

and try re-running your DROP TABLE statement

回答2:

I noticed following line from error.

exact fetch returns more than requested number of rows

Then, I was thinking.. Oracle was expecting one row but It was getting multiple rows. And, only dual table has that characteristic, which returns only one row.

And, I remember that, I have done few changes in dual table and when I executed dual table. Then found multiple rows.

Now, I truncated dual table and inserted only row which X value. And, everything working fine.

来源：https://stackoverflow.com/questions/30478070/how-to-solve-sql-error-ora-00604-error-occurred-at-recursive-sql-level-1