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тАО08-25-2003 03:56 AM
тАО08-25-2003 03:56 AM
We have got a RP 5470 running HPUX 11i with a oracle 7.3 database. Recently due to an migration of an application from an old server, the number of concurrent users logged in has increased and has slowed down the system drastically. I doubt on some of the Oracle related tuable kernel parameters which has never been set. Can i get a list of those parameters and their recommended values.
Thanks in Advance
Naveej
Solved! Go to Solution.
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тАО08-25-2003 05:36 AM
тАО08-25-2003 05:36 AM
Re: HPUX 11.11 tunable kernal parameters for HPUX 11.11
Increasing 'nstrtel' and 'nproc' parameters may help u.
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тАО08-26-2003 05:51 PM
тАО08-26-2003 05:51 PM
Re: HPUX 11.11 tunable kernal parameters for HPUX 11.11
The following table documents Unix kernel parameters that should be monitored and possibly increased after changes are made to the related init.ora parameter.
Init.ora Parameter Unix Kernel Parameter
db_block_buffers shmmax
db_files maxdatafiles) nfile,
maxfiles
large_pool_size shmmax
log_buffer shmmax
processes nproc, semmsl, semmns
shared_pool_size shmmax
As you have more number of concurrent users now, you will be set the process and sessins parameter and may be you want to make sure that the parameters related to number of processes (nproc) and the number of file descriptors as well.
The following Kernel Parameters tend to be generic
maxfiles - Soft file limit per process.
maxuprc - Maximum number of simultaneous user processes per userid.
nfile - Maximum number of simultaneously open files systemwide at any given time.
nproc - Maximum number of processes that can exist simultaneously in the system.
shmmax - The maximum size(in bytes) of a single shared memory segment.
shmmin - The minimum size(in bytes) of a single shared memory segment.
shmmni - The number of shared memory identifiers.
shmseg - The maximum number of shared memory segments that can be attached by a process.
semmns - The number of semaphores in the system.
semmni - The number of semaphore set identifiers in the system; determines the number of semaphore sets that can be created at any one time.
semmsl - The maximum number of sempahores that can be in one semaphore set. It should be same size as maximum number of Oracle processes.
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тАО08-26-2003 06:13 PM
тАО08-26-2003 06:13 PM
Re: HPUX 11.11 tunable kernal parameters for HPUX 11.11
Why not post your system file and swapinfo -tam output. And provide an estimate on average number of concurrent users.
Tim
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тАО08-27-2003 10:40 PM
тАО08-27-2003 10:40 PM
Re: HPUX 11.11 tunable kernal parameters for HPUX 11.11
Thanks and regards
Naveej
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тАО08-27-2003 10:54 PM
тАО08-27-2003 10:54 PM
SolutionYou have explicitly set nbuf to 6552. This means you have a buffer cache of about 25Mb. No wonder performance sucks.
Remove that line from the system file.
Add dbc_max_pct and set it to 15 (for a start anyway).
nflocks also looks small in comparison to nfile.
You will need to regenerate the kernel and reboot.
Performance will improve.
Tim