Search notes:

Oracle hint: OPT_PARAM

opt_param sets the value of a limited set of init parameters (which are all related to the optimizer) for the duration of the SQL statement. The syntax is: 
/*+ opt_param(<parameter_name> [,] <parameter_value>) */
For example: /*+ opt_param('_optimizer_adaptive_plans', 'false') */ or /*+ opt_param('_parallel_syspls_obey_force', 'false') */.

See also

The init parameter init parameter optimizer_features_enable has a corresponding hint with the same name.
Other hints such as opt_estimate.
MOS Note 377333.1

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:51 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(51): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(66): id_of(Object(PDO), 'uri', '/notes/developm...') #2 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1740476490, '3.137.161.182', 'Mozilla/5.0 App...', NULL) #3 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/SQL/hints/list/opt/param(45): insert_webrequest() #4 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 51