Maximum session reached. Y at - it report any with PGA and SGA?

Friends,

OS: RHEL AS 3
DB: 9iR2

Currently...
Process = 150
sessions = 170

now, I want to be
Process = 250
sessions = 280

my current sysctl.conf is...
# Oracle 9i kernel parameters
#
kernel.sem = 250 32000 100 150
kernel.shmmax = 4294967295
kernel.shmmni = 4096
kernel.shmseg = 4096
kernel.shmall = 3279547
fs.file-max = 327679
kernel.msgmni = 2878
kernel.msgmnb = 65536
net.ipv4.ip_local_port_range = 1024 65536
#
# End of parameters
SQL> select * from v$sga;

NAME                      VALUE
-------------------- ----------
Fixed Size               452164
Variable Size         268435456
Database Buffers      369098752
Redo Buffers             667648
and our server ram is 2 GB.

is that the values above are sufficient to improve processes and sessions for 250 and 280?
What are the limits to improve processes and sessions?
I think also, long back I asked the same question. but here, I searched is not here. After the upgrade of this forum this thread has been deleted.

Thank you

VPS wrote:
Friends,

Currently...
Process = 150
sessions = 170

now, I want to be
Process = 250
sessions = 280

The process parameter controls a number of allowances in the SGA heap table - (which is the array of sessions, by default, processes * 1.1 + 5). An increase in the process automatically increases the variable size in 9i.

But here are some numbers to a 32-bit process = 150 Windows startup
125829120 variable size bytes

then, with the process = 250
Variable 134217728 bytes size

As you can see, the additional allowance is only about 8.5 MB - and this does not to cause any problems with your settings in memory.

There is an informal indication of 10g, you should have a db_cache_size which is at least 1 MB per process - and you are already experiencing this figure - even after the increase.

In a reasonable manner for the pga_aggregate_target for systems OLTP is put somewhere between 1 MB and 4 MB per process - depending on the nature and the amount of SQL statements used. If you do have enough memory to deal with it (as long as you don't get too close to the end of 4 MB of the scale - v$ v sql_workarea_histogramand $ pgastat to see how your current pga_aggregate_target is to check).

Process more means more open cursors, however, you may have a relatively small increase in the shared_pool_size if your application is good for sharing SQL - but a larger increase if your code is not very common.

You can also look at an article and a presentation by Christo Kutrowski of the Pythian Group which deals related to Oracle o/s overhead, its SGA and the number of process - and how to minimize.
See: http://www.pythian.com/blogs/741/pythian-goodies-free-memory-swap-oracle-and-everything

Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
http://www.jlcomp.demon.co.UK

"The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge." Stephen Hawking.

Tags: Database

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