Search notes:

ORA-43929: Collation cannot be specified if parameter MAX_STRING_SIZE=STANDARD is set

The default collation can only be set if the init parameter max_string_size is set to extended. 
SQL> select value from v$parameter where name = 'max_string_size';
STANDARD

SQL> alter session set default_collation = using_nls_comp;
ORA-43929: Collation cannot be specified if parameter MAX_STRING_SIZE=STANDARD is set
The following create table throws the same error (with max_string_size=standard): 
create table tq84_collation (
   txt_ci  varchar2(10) collate binary_ci
);

See also

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...', 1758205466, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/errors/ORA-43929_Collation-cannot-be-specified-if-parameter-MAX_STRING_SIZE_STANDARD-is-set(47): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78