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tpt/aot/tx_lock_diag.txt Normal file
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SQL> @s 152
SID STATE EVENT SEQ# SEC_IN_WAIT P1 P2 P3 P1TRANSL
------- ------- ---------------------------------------- ---------- ----------- ---------- ---------- ---------- ------------------------------------------
152 WAITING enq: TX - row lock contention 21 3 1415053318 393221 6000 0x54580006: TX mode 6
SQL> select obj, tch, file#, dbablk
2 from x$bh
3 where bitand(flag,8)=8;
no rows selected
SQL>
SQL>
SQL>
SQL>
SQL>
SQL> desc v$transaction
Name Null? Type
------------------------------------------------------------------------------------------------------ -------- ----------------------------------------------------------------------------
1 ADDR RAW(8)
2 XIDUSN NUMBER
3 XIDSLOT NUMBER
4 XIDSQN NUMBER
5 UBAFIL NUMBER
6 UBABLK NUMBER
7 UBASQN NUMBER
8 UBAREC NUMBER
9 STATUS VARCHAR2(16)
10 START_TIME VARCHAR2(20)
11 START_SCNB NUMBER
12 START_SCNW NUMBER
13 START_UEXT NUMBER
14 START_UBAFIL NUMBER
15 START_UBABLK NUMBER
16 START_UBASQN NUMBER
17 START_UBAREC NUMBER
18 SES_ADDR RAW(8)
19 FLAG NUMBER
20 SPACE VARCHAR2(3)
21 RECURSIVE VARCHAR2(3)
22 NOUNDO VARCHAR2(3)
23 PTX VARCHAR2(3)
24 NAME VARCHAR2(256)
25 PRV_XIDUSN NUMBER
26 PRV_XIDSLT NUMBER
27 PRV_XIDSQN NUMBER
28 PTX_XIDUSN NUMBER
29 PTX_XIDSLT NUMBER
30 PTX_XIDSQN NUMBER
31 DSCN-B NUMBER
32 DSCN-W NUMBER
33 USED_UBLK NUMBER
34 USED_UREC NUMBER
35 LOG_IO NUMBER
36 PHY_IO NUMBER
37 CR_GET NUMBER
38 CR_CHANGE NUMBER
39 START_DATE DATE
40 DSCN_BASE NUMBER
41 DSCN_WRAP NUMBER
42 START_SCN NUMBER
43 DEPENDENT_SCN NUMBER
44 XID RAW(8)
45 PRV_XID RAW(8)
46 PTX_XID RAW(8)
SQL> @dec 1415053318
DEC HEX
----------------------------------- --------------------
1415053318.000000 54580006
SQL> @lt TX
TYPE LOCK NAME ID1 MEANING ID2 MEANING LT_ DESCRIPTION
---- ------------------------------ ------------------------- ------------------------- --- ------------------------------------------------------------
TX Transaction usn<<16 | slot sequence YES Lock held by a transaction to allow other transactions to
wait for it
SQL> @s 152
SID STATE EVENT SEQ# SEC_IN_WAIT P1 P2 P3 P1TRANSL
------- ------- ---------------------------------------- ---------- ----------- ---------- ---------- ---------- ------------------------------------------
152 WAITING enq: TX - row lock contention 21 78 1415053318 393221 6000 0x54580006: TX mode 6
SQL>
SQL>
SQL> @s 152
SID STATE EVENT SEQ# SEC_IN_WAIT P1 P2 P3 P1TRANSL
------- ------- ---------------------------------------- ---------- ----------- ---------- ---------- ---------- ------------------------------------------
152 WAITING enq: TX - row lock contention 21 81 1415053318 393221 6000 0x54580006: TX mode 6
SQL>
SQL> select * from v$lock where sid = 152;
ADDR KADDR SID TY ID1 ID2 LMODE REQUEST CTIME BLOCK
---------------- ---------------- ---------- -- ---------- ---------- ---------- ---------- ---------- ----------
00000003DA32CE88 00000003DA32CEA8 152 TX 393221 6000 0 6 99 0
00000003DA99E260 00000003DA99E288 152 TM 58197 0 3 0 99 0
SQL> select * from v$lock where sid = 152 and request != 0;
ADDR KADDR SID TY ID1 ID2 LMODE REQUEST CTIME BLOCK
---------------- ---------------- ---------- -- ---------- ---------- ---------- ---------- ---------- ----------
00000003DA32CE88 00000003DA32CEA8 152 TX 393221 6000 0 6 108 0
SQL> select mod(393221,power(2,16)) from dual;
MOD(393221,POWER(2,16))
-----------------------
5
SQL> select 393221/power(2,16) usn, mod(393221,power(2,16)) slot from dual;
USN SLOT
---------- ----------
6.00007629 5
SQL> select trunc(393221/power(2,16)) usn, mod(393221,power(2,16)) slot from dual;
USN SLOT
---------- ----------
6 5
SQL>
SQL>
SQL>
SQL> select ses_addr from v$transaction where XIDUSN = 6 and XIDSLOT = 5;
SES_ADDR
----------------
00000003DD24CBA0
SQL> select sid, sql_hash_value from v$session where saddr = '00000003DD24CBA0';
SID SQL_HASH_VALUE
---------- --------------
144 3935459581
SQL> @sql 3935459581
CH# SQL_TEXT
---- ------------------------------------------------------------------------------------------------------------------------------------------------------
0 BEGIN dbms_lock.sleep(600); END;
CH# PARENT_HANDLE OBJECT_HANDLE PARSES H_PARSES EXECUTIONS FETCHES ROWS_PROCESSED LIOS PIOS SORTS CPU_MS ELA_MS USERS_EXECUTING
---- ---------------- ---------------- ---------- ---------- ---------- ---------- -------------- ---------- ---------- ---------- ---------- ---------- ---------------
0 00000003DC63AD80 00000003DC4EF988 1 1 0 0 0 0 0 0 3.729 3.729 1
SQL>
SQL>
SQL> desc v$open_cursor
Name Null? Type
------------------------------------------------------------------------------------------------------ -------- ----------------------------------------------------------------------------
1 SADDR RAW(8)
2 SID NUMBER
3 USER_NAME VARCHAR2(30)
4 ADDRESS RAW(8)
5 HASH_VALUE NUMBER
6 SQL_ID VARCHAR2(13)
7 SQL_TEXT VARCHAR2(60)
SQL> select hash_value, sql_text from v$open_cursor where sid = 144;
HASH_VALUE SQL_TEXT
---------- ------------------------------------------------------------
1420612433 update smon_scn_time set orig_thread=0, time_mp=:1, time_dp=
3114265815 select local_tran_id, global_tran_fmt, global_oracle_id, glo
3935459581 BEGIN dbms_lock.sleep(600); END;
541202592 select obj, tch, file#, dbablk from x$bh where bitand(flag,8
599212612 select s.username i_username, i.instance_name i_instance
2953317698 update mytest set dummy = 'Y'
2509924099 select value ||'/'||(select instance_name from v$instance)
7 rows selected.
SQL>
-- these were the troublemakers
3935459581 BEGIN dbms_lock.sleep(600); END;
2953317698 update mytest set dummy = 'Y'