Hi Olav,
Thanks a lot for spending time to find the cause for the large log
files. My comments are in-line.
Olav Sandstaa wrote:
Suresh
Suresh Thalamati wrote:
Olav Sandstaa (JIRA) wrote:
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https://issues.apache.org/jira/browse/DERBY-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12466475
]
Olav Sandstaa commented on DERBY-2254:
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I have tried running with these settings and the resulting 3.2 GB
derby.log file contains the dump of about 16 million log records. The
last entries in the log are:
<snip > ..
As you suggested, I tried to look for any sign of whether a checkpoint
was in progress or not. But from the dump of the log I can not find any
sign of checkpoints in the entire log. Do you have any suggestions for
how a checkpoint would identify itself in the log dump?
Checkpoint in the log trace , should look something like the following :
DEBUG LogTrace OUTPUT: scanned 160 : Checkpoint : redoLWM (1,49176)
undoLWM (1,49176)
**************************
[EMAIL PROTECTED]
..etc.
I was thinking there should be a checkpoint in log files around
the large log files,(log1191.dat (log1191.dat log1198.dat ..)
not necessarily in the them.
Only other reason I can think for not finding a checkpoint is ,
it started in the beginning and never finished. If this the case
then I am confused how it managed to generate ~1MB log files in
between those large ones.
If I try to categorize the entries in the log dump they fall into the
following types (with the number of occurrences in the first column):
11422649 Page Operation:
2340723 BeginXact
2340734 EndXact
420947 Checksum Operation
29 detected proper log end on log file
29 switched to next log file
None of these seems to indicate that a checkpoint have started?
you are correct, those records can not confirm that the checkpoint in
progress. Checkpoint log records is written only after all the data
is flushed, in your test case failure seems to have occured while
writing a checkpoint record. Looking at the last entries may not be
be useful.
Thanks
-suresht
