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)

           {

           }