core/src/main/java/com/orientechnologies/orient/core/sql/OCommandExecutorSQLAlterDatabase.java
public Object execute(final Map<Object, Object> iArgs) {
    if (attribute == null)
      throw new OCommandExecutionException("Cannot execute the command because it has not been parsed yet");

    final ODatabaseDocumentInternal database = getDatabase();
    database.checkSecurity(ORule.ResourceGeneric.DATABASE, ORole.PERMISSION_UPDATE);

    database.setInternal(attribute, value);
    return null;
  }
public Object execute(final Map<Object, Object> iArgs) {
    if (attribute == null)
      throw new OCommandExecutionException("Cannot execute the command because it has not been parsed yet");

    final ODatabaseDocumentInternal database = getDatabase();
    database.checkSecurity(ORule.ResourceGeneric.DATABASE, ORole.PERMISSION_UPDATE);

    database.setInternal(attribute, value);
    return null;
  }
Execute the ALTER DATABASE.