oracle - ORA-00060 trace file explanation -


i have known deadlock in merging query. there no foreign keys, triggers, pl/sql. master table btree index composite primary key. helper table temporal session private (no primary key). multiple threads inserts entries temporal table , call merge.

all stuff looks pretty typical cannot classify problem source. dug article doing application design reason for. case doesn't fit of mentioned patterns %100.

lock types in deadlock graph looks "primary key overlap", trace has rows. though there 2 looping rows contingent case has no rows @ all.

deadlock graph:                        ---------blocker(s)--------  ---------waiter(s)--------- resource name          process session holds waits  process session holds waits tx-0006000d-00010e04        24    1432     x             23    2918           s tx-00270002-00019175        23    2918     x             24    1432           s  session 1432: did 0001-0017-015a7b2a    session 2918: did 0001-0031-002724ee  session 2918: did 0001-0031-002724ee    session 1432: did 0001-0017-015a7b2a   rows waited on:   session 1432: obj - rowid = 00004061 - aaaebhaaeabffcsaaa   (dictionary objn - 16481, file - 4, block - 24924332, slot - 0)   session 2918: obj - rowid = 00004061 - aaaebhaaeabffcsaaa   (dictionary objn - 16481, file - 4, block - 24924332, slot - 0)

on second snippet of trace see 1 slot (committed , lock released). according interested transaction list ( itl ) in oracle "lck" means no rows locked @ all, see 2 rows above?

 object id on block? y  seg/obj: 0x4061  csc: 0x00.24a90627  itc: 1  flg: e  typ: 2 - index      brn: 0  bdba: 0x156a730 ver: 0x01 opc: 0      inc: 0  exflg: 0   itl           xid                  uba         flag  lck        scn/fsc 0x01   0x0006.00a.0000d5fb  0x000556a1.13a8.02  c---    0  scn 0x0000.24a8fa32 branch block dump


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