SQL> @sw 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> @calc 1415053318 + 0 DEC HEX ---------- -------------------- 1415053318 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> @sw 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> @sw 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'