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DECLARE 
  TEMP_COUNT NUMBER; 
  SQLSTR VARCHAR2(200); 
BEGIN 
  SQLSTR := 'ALTER USER "RELEASE_MANAGER" QUOTA UNLIMITED ON "USERS"';
  EXECUTE IMMEDIATE SQLSTR;
EXCEPTION 
  WHEN OTHERS THEN
    IF SQLCODE = -30041 THEN 
      SQLSTR := 'SELECT COUNT(*) FROM USER_TABLESPACES 
              WHERE TABLESPACE_NAME = ''USERS'' AND CONTENTS = ''TEMPORARY''';
      EXECUTE IMMEDIATE SQLSTR INTO TEMP_COUNT;
      IF TEMP_COUNT = 1 THEN RETURN; 
      ELSE RAISE; 
      END IF;
    ELSE
      RAISE;
    END IF;
END;
/