Hi Jay,
Do you have any application using XA transactions?
( https://en.m.wikipedia.org/wiki/X/Open_XA ;).
These can cause inactive transaction branch waits.
hth,
Martin
^∆x
Redacted sender Jay.Miller for DMARC <dmarc-noreply@xxxxxxxxxxxxx> schrieb
am Fr., 6. März 2020, 21:10:
I was looking into an unrelated issue on one of our dbs and I saw that it
has been experiencing a high level of Inactive Transaction Branch waits. I
started researching but the database has no db links and every reference I
found indicated that it would be related to a distributed transaction over
a db link.
While it doesn't seem to be causing noticeable performance issues for the
app I would like to figure out what's going on
Checking p1 and p1text in v$session_wait for sessions experiencing the
wait show
branch#,0
From what I've read the 0 value should have been the serial# of the
session causing this session to wait. But it obviously isn't.
Looking at the session in OEM the wait event shows a blank sql id and SQL
Command = UNKNOWN. I ran a trace on a session but couldn’t find it
associated with any specific sql there either.
Looking at an AWR report it's the top wait event:
Top 10 Foreground Events by Total Wait Time
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Total Wait Wait % DB
Wait
Event Waits Time (sec) Avg(ms) time
Class
------------------------------ ----------- ---------- ---------- ------
--------
inactive transaction branch 23,881 27.9K 1169.16 56.4
Other
log file switch (checkpoint in 9,045 8493.7 939.05 17.2
Configur
DB CPU 8354.9 16.9
db file sequential read 3,185,440 1081.5 0.34 2.2
User I/O
log file sync 285,783 793.3 2.78 1.6
Commit
enq: TX - row lock contention 10,605 736.9 69.49 1.5
Applicat
direct path read temp 617,178 561.8 0.91 1.1
User I/O
direct path write temp 406,728 520.6 1.28 1.1
User I/O
buffer busy waits 9,150 472.6 51.65 1.0
Concurre
direct path read 527,903 355 0.67 .7
User I/O
Anyone have ideas or advice on how to track down what is causing this?
TIA,
Jay Miller