Oracle Transaction Hanging

Question

A transaction from a packaged application is hanging and has to be aborted - no other sessions are active. It was working fine a week ago. There are no errrors in the Alert log. What is the best way to troubleshoot this without access to source code ? Is it possible to identify the SQL that is invovled and any locked objects ? I see a table v$locked_object but do not know if it would be useful
thanks for any pointers

Answer 1

you can creat a script like this one(it will not work properly due to need create some tables) to see what the application doing when it is hang:
set lines 200
set pages 1000
set verify off
set feedback off
accept the_sid prompt "SID= "
delete from temp_sql_hash_address where id_str='SIDINFO';
set head off
select 'SID(' || &the_sid || ')info' from dual;
select '---------------' from dual;
set head on
column machine format a30
column terminal format a30
column program format a30
select username,status,
decode(command, 1,'CRE TAB',2,'INSERT',3,'SELECT',4,'CRE CLUSTER',5,'ALT CLUSTER',
6,'UPDATE',7,'DELETE',8,'DRP CLUSTER',9,'CRE INDEX',10,'DROP INDEX',11,'ALT INDEX',
12,'DROP TABLE',13,'CRE SEQ',14,'ALT SEQ',15,'ALT TABLE',16,'DROP SEQ',17,'GRANT',
18,'REVOKE',19,'CRE SYN',20,'DROP SYN',21,'CRE VIEW',22,'DROP VIEW',23,'VAL INDEX',
24,'CRE PROC',25,'ALT PROC',26,'LOCK TABLE',28,'RENAME',29,'COMMENT',30,'AUDIT',31,'NOAUDIT',
32,'CRE DBLINK',33,'DROP DBLINK',34,'CRE DB',35,'ALTER DB',36,'CRE RBS',37,'ALT RBS',
38,'DROP RBS',39,'CRE TBLSPC',40,'ALT TBLSPC',41,'DROP TBLSPC',42,'ALT SESSION',43,'ALT USER',
44,'COMMIT',45,'ROLLBACK',46,'SAVEPOINT',47,'PL/SQL EXEC',48,'SET XACTN',49,'SWITCH LOG',
50,'EXPLAIN',51,'CRE USER',52,'CRE ROLE',53,'DROP USER',54,'DROP ROLE',
55,'SET ROLE',56,'CRE SCHEMA',57,'CRE CTLFILE',58,'ALTER TRACING',59,'CRE TRIGGER',
60,'ALT TRIGGER',61,'DRP TRIGGER',62,'ANALYZE TAB',63,'ANALYZE IX',64,'ANALYZE CLUS',
65,'CRE PROFILE',66,'DRP PROFILE',67,'ALT PROFILE',68,'DRP PROC',69,'DRP PROC',70,'ALT RESOURCE',
71,'CRE SNPLOG',72,'ALT SNPLOG',73,'DROP SNPLOG',74,'CREATE SNAP',75,'ALT SNAP',76,'DROP SNAP',
79,'ALTER ROLE',85,'TRUNC TAB',86,'TRUNC CLUST',88,'ALT VIEW',91,'CRE FUNC',92,'ALT FUNC',
93,'DROP FUNC',94,'CRE PKG',95,'ALT PKG',96,'DROP PKG',97,'CRE PKG BODY',98,'ALT PKG BODY',99,'DRP PKG BODY',
to_char(command)) command
from v$session where sid=&the_sid;
select osuser,machine,terminal,program
from v$session where sid=&the_sid;
select TADDR,lockwait,sql_address,sql_hash_value,
row_wait_obj#,row_wait_block#,row_wait_row#
from v$session where sid=&the_sid;
column "blocker info" format a100
select find_blocker(&the_sid) "blocker info" from dual;
insert into temp_sql_hash_address
select 'SIDINFO',sql_address,sql_hash_value from v$session where sid=&the_sid;
commit;
select 'ALTER SYSTEM KILL SESSION '''||sid||','||serial#||''';' from v$session where sid=&the_sid;
select p.username "Proc username", p.USERNAME "username",p.PROGRAM "proc program",p.LATCHWAIT,p.LATCHSPIN,p.pid,p.spid
from v$process p,v$session s
where s.paddr=p.addr
and s.sid=&the_sid;
select addr,xidusn,xidslot,xidsqn,t.status,start_time
from v$transaction t,v$session s
where s.taddr=t.addr
and s.sid=&the_sid;
select used_ublk,used_urec,log_io,phy_io,cr_get,cr_change
from v$transaction t,v$session s
where s.taddr=t.addr
and s.sid=&the_sid;
select
substr(a.os_user_name,1,12) "OS User"
, substr(a.oracle_username,1,12) "DB User"
, substr(b.owner,1,12) "Schema"
, substr(b.object_name,1,30) "Object Name"
, substr(b.object_type,1,10) "Type"
, substr(c.segment_name,1,12) "RBS"
, substr(d.used_urec,1,12) "# of Records"
from v$locked_object a
, dba_objects b
, dba_rollback_segs c
, v$transaction d
, v$session e
where a.object_id = b.object_id
and a.xidusn = c.segment_id
and a.xidusn = d.xidusn
and a.xidslot = d.xidslot
and d.addr = e.taddr
and e.sid=&the_sid
column message format a60
select ELAPSED_SECONDS,TIME_REMAINING,message,sql_address,SQL_HASH_VALUE
from v$session_longops where sid=&the_sid;
insert into temp_sql_hash_address
select 'SIDINFO',sql_address,sql_hash_value from v$session_longops where sid=&the_sid;
select BLOCK_GETS,CONSISTENT_GETS,PHYSICAL_READS,BLOCK_CHANGES,CONSISTENT_CHANGES
from v$sess_io where sid=&the_sid;
break on address
column event format a30
select address,sql_text from v$sqltext
where (address,hash_value) in (select address,hash_value
from temp_sql_hash_address where id_str='SIDINFO')
order by address,piece;
select event,p1,p1raw,p2,p2raw,p3,p3raw,wait_time,seconds_in_wait
from v$session_wait where sid=&the_sid;
select n.name,s.value from v$sesstat s,v$statname n
where sid=&the_sid and
n.statistic#=s.statistic# and value>0
and s.statistic# in (select statistic# from monitor_statistic);
select EVENT,TOTAL_WAITS,TOTAL_TIMEOUTS,TIME_WAITED,AVERAGE_WAIT,MAX_WAIT from v$session_event where sid=&the_sid
and event in (select event from monitor_event);