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ORA-12954: The request exceeds the maximum allowed database size of 12 GB.

The maximum size in Oracle Express and Oracle 23c free edition is 12 GB.
SQL> create tablespace tq84_fba_ts datafile […] size 50g autoextend off;
ORA-12954: The request exceeds the maximum allowed database size of 12 GB.

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Other Oracle error messages

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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...', 1759473983, '216.73.216.42', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/errors/ORA-12954_The-request-exceeds-the-maximum-allowed-database-size-of-12-GB(40): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78