IDS Forum

Re: help me with Log files matters

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Date:

----- Original Message -----
To: bernard_kam2002@yahoo.com
At: 3/19 8:30

First problem, NEVER us CPU VPs for tcp listener NETTYPE settings. If you want
to know the reasoning then search the IIUG archive of the CDI newsgroup. I
posted a rather extensive explanation last month. Meantime, change the NETTYPE
to:

NETTYPE soctcp,1,50,NET

Likewise one should not run shard memory listeners in NET VPs so any ipcshm
NETTYPE should look like this:

NETTYPE ipcshm,1,50,CPU

Polling the network for requests and connections is what is causing the CPU VP
to spin and run up so much cpu time. Now to your real problem. Yes, if you are
inserting a HUGE record into a table (even more so if you are updating an
existing BLOB row but even for an INSERT) and you only have one CPU VP, other
queries and updates will seem to stall until this one transaction is completed.
Your ONLY solution is more CPUS and more CPU VPs. IFF you have fast processors
(above 550MHZ for most or about 750MHZ for Intel) you can try to run a second
CPU VP on the one CPU. It will certainly improve things during the BLOB loads
but you will have to test and see if the load on your one CPU is too much.

Art S. Kagel

----- Original Message -----
From: Kam Bernard <bernard_kam2002@yahoo.com>
At: 3/19 7:55

>
> Hi Friends,
> Any know this problem, pls help me to correct it.
> It's OK When i inserted big data file into BLOB field in my database from one
> apb application via browser at the SAME machine running IDS 9.3 under WinNT,
but
> this work failed when i did insert as above from other machine
> at the same SubNET, when upload transaction uploaded about 30-40 percent of
> data file, then it stalled or stopped and issued error mesg "Long transaction
> aborted"
> but the mysterious thing here is that DB server was seemly trying to process
> this aborted transaction, this made CPU is very tired of processing this
> transaction
> and maybe hang during transaction, consequently all new transactions will be
> waiting or can not done.
>
> I took a look closely at column titled USERCPU of VP CPU when i ran onstat -g
> glo command
> and saw that value of it was up to more 200 or higher, otherwise this value is
> around 20 to 30 when i did the same upload via browser at Server machine.
> Basically, I set NETTYPE line to soctcp,1,50,CPU in file ONCONFIG (server
> machine X86 has one CPU intel 800 MHZ, 500 Mb RAM).
> Therefore, pls teach me know why i could not insert big data into BLOB field
via
> LAN network ?, in while this can do
> successfully at the same machine with DB server.
> Thanks,
> Bernard.
>
>
>
> "ART KAGEL, BLOOMBERG/ 65E 55TH" <KAGEL@bloomberg.net> wrote:----- Original
> Message -----
> From: Kam Bernard
> At: 3/18 7:53
>
> >
> > Hi,
> > I am running IDS 9.3 on WinNT, when i insert or upload big sizing data files
> > into Blob field in one database, so data files is big that it needs much log
> > spaces (Log files) to help long transaction successfully, i must often add
> much
> > log files as i insert big data file into database, the problem here is that
> > cooked Log files could not be freed by IDS, consequently that next insert
> > activity will be stucked by lack of log spaces needed and then transaction
> will
> > be interrupted when transaction TIME_OUT values expired. To free log files
> > physically, i often drop cooked log files and then add new log files for
next
> > transaction.
>
> ALL logical logs are freed AUTOMATICALLY when they are backed up UNLESS there
is
> an active transaction with records in that log, the log contains the current
> checkpoint record, or the log is the current log. Indeed the logical log files
> you are dropping and readding MUST be free for reuse or onparams would not
> permit you to drop them. Whatever problems you are having with your large BLOB
> transaction, logical logs not being freed is not it. This is a red herring.
> Now, your first problem is that your BLOB field is in table space. You should
> move that column into a BLOB space so that it is not logged the same way as
> table space BLOB columns are that will reduce the need for so much logical log
> space. Second, in the meantime, or if you do not want to move the BLOB to
> blobspace, change your load to commit the transaction after every insert or
> update that will release the logical log files for reuse immediately after
they
> are backed up. Third, add more logical log space and try to move all of your
> logical logs to RAW file space which is up to 40% faster then COOKED
filesystem
> space.
>
> Art S. Kagel
>
> > Question: How to free automatically cooked log files (Log files backed up
for
> > any transaction) ?, i used to use onparams utility to add or drop Log files.
> > Thanks,
> > Bernard.
> >
> >
> >
> >
> >
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