An insert in TWG read a lot of UNDO

Hello

I have an insert in a TWG (whose one index for its primary key) that is read a lot of UNDO (db file sequential read file #= 2).

I can't think of a good reason for it.

Here's a tkprof:

SQL ID: hash of Plan 4xwgpzxtgg4s5: 0

INSERT INTO xxxxx.xxxxxxxxxxxxxxxxxx (INCOUNT, INNUM)

VALUES

(: v1,: v2)

call the query of disc elapsed to cpu count current lines

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

Parse        0      0.00       0.00          0          0          0           0

Run the 113 0.09 0.09 36 173 838 6830

Fetch        0      0.00       0.00          0          0          0           0

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

Total 113 0.09 0.09 36 173 838 6830

Chess in the library during parsing cache: 0

Optimizer mode: ALL_ROWS

The analysis of the user id: 108

Elapsed time are waiting on the following events:

Event waited on times max wait for the Total WHEREAS

----------------------------------------   Waited  ----------  ------------

SQL * Net message to client 17 0.00 0.00

SQL * Net client message 17 0.01 0.04

DB file sequential read 36 0.05 0.02

All are file #= 2:

WAITING #2390071304: nam = 'db file sequential read' ela = 735 file #= 2 block # 46834 blocks = 1 obj #= 0 tim = 3960230031525

WAITING #2390071304: nam = 'db file sequential read' ela = 713 file #= 2 #= 46835 blocks = 1 obj #= 0 tim = 3960230032327

WAITING #2390071304: nam = 'db file sequential read' ela = 659 file #= 2 #= 46836 blocks = 1 obj #= 0 tim = 3960230033125

WAITING #2390071304: nam = 'db file sequential read' ela = 648 file #= 2 block # 46837 blocks = 1 obj #= 0 tim = 3960230034030

EXEC #2390071304:c = 0, e = 3535, p = 4, cr = 5, cu = 38, SIG = 0, r is 52, dep = 0, og = 1, plh = 0, tim = 3960230034104

And there is another thing I don't understand. Each EXEC has only a single LINK, such as:

LINKS FOR #2390071304:

Link #0

oacdty = 02 mxl = 22 (22) mxlc = 00 wrong = 00 = 00 = 00 pre scl

oacflg = 01 fl2 = 1000000 frm = 00 csi = 00 siz = 48 off = 0

kxsbbbfp = bln 8e785608 = 22 = 02 = 05 flg avl

value = 12

Link #1

oacdty = 02 mxl = 22 (22) mxlc = 00 wrong = 00 = 00 = 00 pre scl

oacflg = 01 fl2 = 1000000 frm = 00 csi = 00 siz = off 0 = 24

kxsbbbfp = bln 8e785620 = 22 avl = flg 05 = 01

value = 7961958

However, the execs reported about 50 lines (as you can see the number of lines in the tkprof)

Any idea of the reason for this?

Thank you very much

Kind regards

Franck.

Check if the recording of flashback is enabled.

Others explain the curiosity to see a single set of values of bind variables when you table inserts - playback of cancellation could be "physical reads for new return of flame." I have provided a brief description in the last comment to the next note of the RTO: Flashback - high load

Concerning

Jonathan Lewis

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    5. as the P4_BUILDER_NAME and the P4_BUILDER_RANK exist in the session, to which page 2 be reloaded, (A) the selection list should be updated with the new generator (still not sure why all my entries appeared downstairs instead of in alphabetical?) and (B) the P2_BUILDER_NAME and the P2_BUILDER_RANK can have Post calculation calculations together (NVL) ((: P4_BUILDER_NAME,: P2_BUILDER_NAME) and NVL (: P4_BUILDER_RANK,: P2_BUILDER_RANK) respectively)-l' effect is, if there are the values stored in the page P4 elements, we use them, otherwise, we use whatever values were in the elements of page P2

    6 - Finally, to stop (5) that happens in all the loading of page 2, you would need to clear the cache of page 4 in as many places as possible - for example, branches for a 2 page or buttons on page 2

    The reason why we cannot pass values back to page 2, it is one of the elements is a list of selection. The value we want to select will appear not on the selection list until the page has been sent. So, we can set the value and submit because the value is not there. We can introduce and define the value, because the javascript don't know when the page has been updated (or, at least, you need an independent mechanism to identify, which can get complicated).

    So, in other words, as long as we know that if the values are in the session, we can use Post calculation calculations to set our fields to these values. The only thing to keep in mind is that we must ensure that these session values only exist when in need - so we empty the cache. This principle should work for any type of terrain - but as you have no doubt seen, simple text fields can be updated by the popup directly as the field must accept any value that we give.

    My only recommendation would be to completely remove the MRU of the page process because they are not necessary (they simply confuse the issue) and you could make your fetch PK and record insert into a single process - just to keep things clean and tidy, you understand!

    When I finished last night with your app, I will leave so that javascript can create an option on the select list, and then set the value. But the method described above seems to be much simpler.

    Andy

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    Hello!

    It's not easy to say what the problem is.

    First of all, what laptop do you have exactly?

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    You can also reinstall Windows with the recovery disk. It could be a software problem or driver.

    If you have any other questions, I'll try to help you.

    Good bye

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