CREATE INDEXES online is waiting for the TX = 4 mode

Hello

I have a strange blocking problem where an INDEX CREATE LINE is waiting for a transaction that did only inserted a line in the parent table.

Wait is mode TX = 4 (not TM locks) and I currently have it reproduced only on 11.2.0.3 and 11.2.0.4

Easy to replicate the schema SCOTT:

Session 1:

SQL > set time on

14:54:58 SQL > insert into SCOTT. Dept (DEPTNO, dname) values (50, 'test');

1 line of creation.

Session 2;

14:55:24 SQL > create index test on SCOTT. EMP (ename) online;

It's waiting ' enq: TX - line lock conflict ":"

SQL > select sid, chain_signature from v$ wait_chains where blocker_is_valid = 'TRUE '.

SID CHAIN_SIGNATURE

---------- ----------------------------------------------------------------------

603 ' SQL * Net client message' < ='enq: TX - line lock conflict '

While waiting to acquire the lock of transaction in mode 4:

SQL > select * lock gv$ where sid = 603

INST_ID SELECT ADDR KADDR SID TYPE ID1 ID2 LMODE CTIME BLOCK REQUEST

---------- ---------------- ---------------- ---------- ---- ---------- ---------- ---------- ---------- ---------- ----------

1 00000006CDA05EB8 00000006CDA05F10 603 352577 0 4 0 348 2 AE

1 00000006CDA06078 00000006CDA060D0 603 DL 779505 0 3 0 308 2

1 00000006CD9FABE0 00000006CD9FAC38 603 DL 779505 0 3 0 308 2

1 00007F28001F5028 00007F28001F5088 603 779505 0 2 0 308 2 TM

1 00007F28001F5028 00007F28001F5088 603 779510 0 4 0 308 2 TM

1 00000006CD9FA240 00000006CD9FA298 603 779505 0 4 0 308 2 OD

1 00000006B4F26790 00000006B4F26808 589847 711499 6 0 308 2 TX 603

1 00000006CDA0ED68 00000006CDA0EDC0 655377 996169 0 4 308 TX 603 0

I've traced 10046 and 10704:

broadcast message = obj 29231196672 #= 779514 tim = 1447251053634045

ksqgtl * mode TX-000f001e-000ad97c = 4 flags = 0 x 10001 timeout = 21474836 *.

ksqgtl: xcb = 0x6bb322528, ktcdix = 2147483647, topxcb = 0x6bb322528

ktcipt (topxcb) = 0 x 0

ksucti: init logon has of txn DID:

ksqgtl:

ksqlkdid: 0001-003F-0000AFC4

ksudidTrace: ksqgtl

ktcmydid(): 0001-003F-0000AFC4

ksusesdi: 0001-003F-0000AFC3

ksusetxn: 0001-003F-0000AFC4

ksqcmi: TX, f001e, ad97c mode = 4 timeout = 21474836

2015-11-11 15:11:36.566

WAITING #140700792578680: nam ='enq: TX - line lock conflict ' ela 42932082 name = | mode = 1415053316 usn < < 16 | location = sequence 983070 = obj 711036 #= 779514 tim = 1447251096566283

And there is nothing in V$ SESSION leader/block/line current. class obj # is EMP. current sql_id is the CREATE INDEX.

If anyone has an idea on:

-Why creating an index in line must wait for transactions that modified only parent table

-How to continue the investigation

-can or cannot reproduce in other versions

Thanks in advance,

Franck.

I guess you have a constraint foreign key between emp and Dept.

It's expected behaviours: since 11.1 any DML at one end of a referential integrity constraint translates into a mode lock 3 taken at the other end, and your phenomenon resembles a side effect of this.

When you try to create the index online that your session must assume that the other session (holding mode 3 on the emp and dept) may have changed the emp and dept, so it must wait for the session to the commit or rollback.

(I guess that in principle, he could walk the cancellation of the transaction see if EMP had in fact been changed - but maybe who was considered too complicated to be worth the risk to implement)

Concerning

Jonathan Lewis

Updated - I just did a quick check to reproduce the effect on 11.1.0.7

For reference - here are a few notes on modes of locking and how the application has changed over time: https://jonathanlewis.wordpress.com/2010/06/21/locks/

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