Oracle Clob字段过长保存出错改如何解决？

OracleConnection Con = new System.Data.OracleClient.OracleConnection(connectStr);
           try
           {
decimal MsgId = 20；
               string InsertSql = @"insert into MSG
                                 (ID, TITLE, CONTENT, SORT, TIME, AUTHOR, GROUP)
                               values
                                 (:ID,
                                  :TITLE,
                                  :CONTENT,
                                  :SORT,
                                  :TIME,
                                  :AUTHOR,
                                  :GROUP)";
Con.Open();
               OracleCommand cmd = new OracleCommand(InsertSql, Con);
               OracleParameter TITLE = new OracleParameter("TITLE", OracleType.NVarChar);
               OracleParameter CONTENT = new OracleParameter("CONTENT", OracleType.Clob);
               OracleParameter GID = new OracleParameter("GID", OracleType.NVarChar);
               OracleParameter SORT = new OracleParameter("SORT", OracleType.Number);
               OracleParameter TIME = new OracleParameter("TIME", OracleType.DateTime);
               OracleParameter AUTHOR = new OracleParameter("AUTHOR", OracleType.NVarChar);
               OracleParameter GROUP = new OracleParameter("GROUP", OracleType.NVarChar);
TITLE.Value = Model.MsgTitle;
CONTENT.Value = Model.MsgContent;
ID.Value = Guid.NewGuid().ToString();
SORT.Value = MsgId;
TIME.Value = DateTime.Now;
AUTHOR.Value = Model.MsgAuthor;
GROUP.Value = Model.GroupId;
               cmd.Parameters.Add(MSGTITLE);
               cmd.Parameters.Add(MSGCONTENT);
               cmd.Parameters.Add(MSGID);
               cmd.Parameters.Add(MSGSORT);
               cmd.Parameters.Add(MSGTIME);
               cmd.Parameters.Add(MSGAUTHOR);
               cmd.Parameters.Add(MGSGROUP);
               cmd.ExecuteNonQuery();
               Con.Close();

           }
           catch (Exception ex)
           {

           }