Hi,
I've got a question. We just increased our SORTHEAP from 4096 to 25600 and
our SHEAPTHRESH from 80000 to 262144.
Now we saw a SQL955 error occuring but no reason code attached to it.
According to the help, this error occurs if there is insufficient private
process memory (there are no errors in /var/adm/messages
regarding running out of memory and no messages in db2diag.log).
Or if there is insufficient shared memory in the database-wide shared memory
area.
Now the SHEAPTHRESH is supposed to be a soft limit for private sorts and as
I understand we should not get SQL0955 back for private sorts since it will
just mean that our sort will overflow.
This leaves that this is for shared sorts. But from what I understand,the
shared sort is a hard limit but is seperate from the private sort
correct?
Meaning that from the moment we're using close to 262144 for private memory
that new private sorts will get less sortheap and thus higher
change to overflow.
But even if we would be using 262144 for private heap, we could then still
use 262144 for shared sorts correct?
If this is so, then how come we did not get SQL955 errors before we
increased the values?
Also, the statement it failed on was a small statement. The OPT level for
this statement is 5 and Parallelism is set to NO.
The estimated bufferpool numbers for the SORT in the explain is 2.
So this looks to me to have a very high chance to be a private sort and if
so, why do we get the SQL0955 on this?
Thank you.
4  3011 
I also need to add that INTRA_PARALLEL is set to YES but DFT_DEGREE is set
to 1 annd
the application is for this statement using DEGREE 1.
"Erik Hendrix" <he**********@h otmail.com> wrote in message
news:19******** *************** *******@news.te ranews.com... Hi,
I've got a question. We just increased our SORTHEAP from 4096 to 25600 and
our SHEAPTHRESH from 80000 to 262144.
Now we saw a SQL955 error occuring but no reason code attached to it.
According to the help, this error occurs if there is insufficient private
process memory (there are no errors in /var/adm/messages
regarding running out of memory and no messages in db2diag.log).
Or if there is insufficient shared memory in the database-wide shared
memory area.
Now the SHEAPTHRESH is supposed to be a soft limit for private sorts and
as I understand we should not get SQL0955 back for private sorts since it
will just mean that our sort will overflow.
This leaves that this is for shared sorts. But from what I understand,the
shared sort is a hard limit but is seperate from the private sort
correct?
Meaning that from the moment we're using close to 262144 for private
memory that new private sorts will get less sortheap and thus higher
change to overflow.
But even if we would be using 262144 for private heap, we could then still
use 262144 for shared sorts correct?
If this is so, then how come we did not get SQL955 errors before we
increased the values?
Also, the statement it failed on was a small statement. The OPT level for
this statement is 5 and Parallelism is set to NO.
The estimated bufferpool numbers for the SORT in the explain is 2.
So this looks to me to have a very high chance to be a private sort and if
so, why do we get the SQL0955 on this?
Thank you.
Erik,
Did you increase you DBHEAP in line with the increase in SORTHEAP ?
Phil
Erik Hendrix wrote: I also need to add that INTRA_PARALLEL is set to YES but DFT_DEGREE is set
to 1 annd
the application is for this statement using DEGREE 1.
"Erik Hendrix" <he**********@h otmail.com> wrote in message
news:19******** *************** *******@news.te ranews.com... Hi,
I've got a question. We just increased our SORTHEAP from 4096 to 25600
and our SHEAPTHRESH from 80000 to 262144.
Now we saw a SQL955 error occuring but no reason code attached to it.
According to the help, this error occurs if there is insufficient private
process memory (there are no errors in /var/adm/messages
regarding running out of memory and no messages in db2diag.log).
Or if there is insufficient shared memory in the database-wide shared
memory area.
Now the SHEAPTHRESH is supposed to be a soft limit for private sorts and
as I understand we should not get SQL0955 back for private sorts since it
will just mean that our sort will overflow.
This leaves that this is for shared sorts. But from what I understand,the
shared sort is a hard limit but is seperate from the private sort
correct?
Meaning that from the moment we're using close to 262144 for private
memory that new private sorts will get less sortheap and thus higher
change to overflow.
But even if we would be using 262144 for private heap, we could then
still use 262144 for shared sorts correct?
If this is so, then how come we did not get SQL955 errors before we
increased the values?
Also, the statement it failed on was a small statement. The OPT level
for this statement is 5 and Parallelism is set to NO.
The estimated bufferpool numbers for the SORT in the explain is 2.
So this looks to me to have a very high chance to be a private sort and
if so, why do we get the SQL0955 on this?
Thank you.
No, we did not. But we have no messages in the db2diag.log file either.
"Philip Nelson" <te*****@scotdb .com> wrote in message
news:dX******** **************@ news.easynews.c om... Erik,
Did you increase you DBHEAP in line with the increase in SORTHEAP ?
Phil
Erik Hendrix wrote:
I also need to add that INTRA_PARALLEL is set to YES but DFT_DEGREE is
set to 1 annd
the application is for this statement using DEGREE 1.
"Erik Hendrix" <he**********@h otmail.com> wrote in message
news:19******** *************** *******@news.te ranews.com... Hi,
I've got a question. We just increased our SORTHEAP from 4096 to 25600
and our SHEAPTHRESH from 80000 to 262144.
Now we saw a SQL955 error occuring but no reason code attached to it.
According to the help, this error occurs if there is insufficient
private process memory (there are no errors in /var/adm/messages
regarding running out of memory and no messages in db2diag.log).
Or if there is insufficient shared memory in the database-wide shared
memory area.
Now the SHEAPTHRESH is supposed to be a soft limit for private sorts
and as I understand we should not get SQL0955 back for private sorts since it
will just mean that our sort will overflow.
This leaves that this is for shared sorts. But from what I
understand,the shared sort is a hard limit but is seperate from the private sort
correct?
Meaning that from the moment we're using close to 262144 for private
memory that new private sorts will get less sortheap and thus higher
change to overflow.
But even if we would be using 262144 for private heap, we could then
still use 262144 for shared sorts correct?
If this is so, then how come we did not get SQL955 errors before we
increased the values?
Also, the statement it failed on was a small statement. The OPT level
for this statement is 5 and Parallelism is set to NO.
The estimated bufferpool numbers for the SORT in the explain is 2.
So this looks to me to have a very high chance to be a private sort and
if so, why do we get the SQL0955 on this?
Thank you.
Check you current query optimization level. It is probably defaulting to 7.
Try setting it to 5 for the troublesome query.
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