Search notes:

ORA-30673: column to be modified is not an identity column

Demonstration table: 
create table tq84_ora_30673 (id integer primary key, txt varchar2(10));
The following alter table statement throws ORA-30673: column to be modified is not an identity column: 
alter table tq84_ora_30673 modify id integer generated always as identity;

See also

Identity columns
Other Oracle error messages

Index

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1758206761, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/errors/ORA-30673_column-to-be-modified-is-not-an-identity-column(44): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78