Search notes:

ORA-02096: specified initialization parameter is not modifiable with this option

The value of fixed_date can only be changed for the entire system (alter system), not for a session. Hence, the following alter session statement causes an ORA-02096: specified initialization parameter is not modifiable with this option error: 
alter session set fixed_date = '2021-03-05 18:27:03';
Some parameters cannot be modified in memory, for example the process value, hence the following statement also causes this error: 
alter system set processes = 300;
Such parameters must be changed by indicating the scope = spfile clause: 
alter system set processes = 300 scope = spfile;

See also

The values of the columns isses_modifiable, issys_modifiable, ispdb_modifiable and isinstance_modifiable of the view v$parameter.
init parameters
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...', 1758198824, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/errors/ORA-02096_specified-initialization-parameter-is-not-modifiable-with-this-option(51): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78