Answer / guest

Cause: An attempt was made to modify the datatype of column
which has referential constraints; or has check constraints
which only allows changing the datatype from CHAR to VARCHAR
or vise versa.

Action: Remove the constraint(s) or do not perform the
offending operation.

Please add more information about this Error

I've got a database (Oracle Database 10g Enterprise Edition Release 10.2.0.2.0) installed on a server. Via the network I try to connect to the database via a frontend DEVELOPER 2000 R 2.1 (SQL*Plus: Release 3.3.4.0.0 ) while connecting to database I've got the following error- message: ORA-12637: Packet receive failed

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