弱读查询失败，报 cluster weak read service is disabled

 obclient [SYS]> Select /*+ READ_CONSISTENCY(WEAK)*/ count(*) records,
 sum(to_number(substr(dbms_crypto.hash(utl_raw.cast_to_raw('Hash'
 ||"SUBSID"
 ||"ORDERLINEID"
 ||"REGION"
 ||"OLDPRODID"
 ||"NEWPRODID"
 ||"STARTTIME"
 ||"RECDATE"
 ||"STATUS"
 ||"STATUSDATE"
 ||"ORDERID"
 ||"NOTES"
 ),2),24,8),'xxxxxxxx')) HASH_VAL
 From NGCRM_XX.CS_REC_PRODCONVERT_WAITING;
 ORA-00600: internal error code, arguments: -4007, cluster weak read service is disabled, weak read not supported

obclient > ALTER SYSTEM SET weak_read_version_refresh_interval = 50ms;