I'm trying to drop a foreign key constraint but when I
run the alter table I get a broken pipe message.

any idea how I can get around it?

$ isql 'x1:/usr/jam7/data/test' -u "SYSDBA" -p "xx"
Database: x1:/usr/jam7/data/test. User: SYSDBA
SQL> ALTER TABLE ENQHDR DROP CONSTRAINT ENQHDR_FK1;
Statement failed, SQLCODE = -902

Error reading data from the connection.
SQL> exit;
Statement failed, SQLCODE = -902

Error reading data from the connection.
Broken pipe
$

any other statement in place of the exit above gives the same output.

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