- show pdbs;
 - ALTER SYSTEM SET PROCESSES=500 SCOPE=SPFILE;
 - alter session set container= freepdb1;
 - create user dify identified by dify DEFAULT TABLESPACE users quota unlimited on users;
 - grant DB_DEVELOPER_ROLE to dify;
 - 
 - BEGIN
 - CTX_DDL.CREATE_PREFERENCE('dify.world_lexer','WORLD_LEXER');
 - END;
 - /
 
 
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