How create data store with PermSize = 4096MB on HP-UX 64-bit?

Hi!
I use TimesTen 7.0.2:
TimesTen Release 7.0.2.0.0 (64 bit HPUX/IPF) (tt70_1:17001) 2007-05-02T05:22:15Z
Instance admin: root
Instance home directory: /opt/TimesTen/tt70_1
Daemon home directory: /var/TimesTen/tt70_1
Access control enabled.
I set PermSize = 4096MB for my new data store. Then I tryid to create it:
ttIsql -connStr "DSN=tt_rddb1;UID=ttsys;PWD=ttsys;OraclePWD=ttsys;Overwrite=1" -e "exit;"
But operation was failed:
836: Cannot create data store shared-memory segment, error 22.
Can I create data store with such size on HP-UX 64-bit???

Is largefiles enabled? I believe you can check with fsadm -F vxfs /filesystem
Also please understand that 'PermSize' is not the only attribute affecting the size of the timesten shared memory segment. The actual resulting size is
PermSize + TempSize + LogBuffSize + Overhead
So you would need to configure shmmax to be > 4g. Have you tried setting it to (say) 8g (just for testing purposes to see if it eliminates the error).

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How create data store with PermSize 512MB on WIN32?

Hi!
How create data store with PermSize > 512MB on WIN32? If I set PermSize > 512MB on WIN32, then data store becomes invalid.

Thanks for the details. As I mentioned, due to issues with the way Windows manages memory and address space it is generally not possible to create a datastore larger than around 700 Mb on WIN32. Sometimes you may be lucky and get close to 1 GB but usually not. The issue is as follows; on Windows, a TimesTen datastore is a shared mapping created from memory backed by the paging file. This shared mapping must be mapped into the process address space as a contiguous range of addresses. So, if you have a 1 GB datastore then your process needs to have a contiguous 1 GB range of addresses free in order to be able to connect to (map) the datastore. Unfortunately the default behaviour of Windows is to map DLLs into a process address space all over the place and any process that uses any significant number of DLLs is very unlikely to have a contiguous free address range larger than 500-700 Mb.
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Cannot create data store shared-memory segment error

Hi,
Here is some background information:
[ttadmin@timesten-la-p1 ~]$ ttversion
TimesTen Release 11.2.1.3.0 (64 bit Linux/x86_64) (cmttp1:53388) 2009-08-21T05:34:23Z
Instance admin: ttadmin
Instance home directory: /u01/app/ttadmin/TimesTen/cmttp1
Group owner: ttadmin
Daemon home directory: /u01/app/ttadmin/TimesTen/cmttp1/info
PL/SQL enabled.
[ttadmin@timesten-la-p1 ~]$ uname -a
Linux timesten-la-p1 2.6.18-164.6.1.el5 #1 SMP Tue Oct 27 11:28:30 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
[root@timesten-la-p1 ~]# cat /proc/sys/kernel/shmmax
68719476736
[ttadmin@timesten-la-p1 ~]$ cat /proc/meminfo
MemTotal: 148426936 kB
MemFree: 116542072 kB
Buffers: 465800 kB
Cached: 30228196 kB
SwapCached: 0 kB
Active: 5739276 kB
Inactive: 25119448 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 148426936 kB
LowFree: 116542072 kB
SwapTotal: 16777208 kB
SwapFree: 16777208 kB
Dirty: 60 kB
Writeback: 0 kB
AnonPages: 164740 kB
Mapped: 39188 kB
Slab: 970548 kB
PageTables: 10428 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 90990676 kB
Committed_AS: 615028 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 274804 kB
VmallocChunk: 34359462519 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
Hugepagesize: 2048 kB
extract from sys.odbc.ini
[cachealone2]
Driver=/u01/app/ttadmin/TimesTen/cmttp1/lib/libtten.so
DataStore=/u02/timesten/datastore/cachealone2/cachealone2
PermSize=14336
OracleNetServiceName=ttdev
DatabaseCharacterset=WE8ISO8859P1
ConnectionCharacterSet=WE8ISO8859P1
[ttadmin@timesten-la-p1 ~]$ grep SwapTotal /proc/meminfo
SwapTotal: 16777208 kB
Though we have around 140GB memory available and 65GB on the shmmax, we are unable to increase the PermSize to any thing more than 14GB. When I changed it to PermSize=15359, I am getting following error.
[ttadmin@timesten-la-p1 ~]$ ttIsql "DSN=cachealone2"
Copyright (c) 1996-2009, Oracle. All rights reserved.
Type ? or "help" for help, type "exit" to quit ttIsql.
connect "DSN=cachealone2";
836: Cannot create data store shared-memory segment, error 28
703: Subdaemon connect to data store failed with error TT836
The command failed.
Done.
I am not sure why this is not working, considering we have got 144GB RAM and 64GB shmmax allocated! Any help is much appreciated.
Regards,
Raj

Those parameters look ok for a 100GB shared memory segment. Also check the following:
ulimit - a mechanism to restrict the amount of system resources a process can consume. Your instance administrator user, the user who installed Oracle TimesTen needs to be allocated enough lockable memory resource to load and lock your Oracle TimesTen shared memory segment.
This is configured with the memlock entry in the OS file /etc/security/limits.conf for the instance administrator.
To view the current setting run the OS command
$ ulimit -l
and to set it to a value dynamically use
$ ulimit -l <value>.
Once changed you need to restart the TimesTen master daemon for the change to be picked up.
$ ttDaemonAdmin -restart
Beware sometimes ulimit is set in the instance administrators "~/.bashrc" or "~/.bash_profile" file which can override what's set in /etc/security/limits.conf
If this is ok then it might be related to Hugepages. If TT is configured to use Hugepages then you need enough Hugepages to accommodate the 100GB shared memory segment. TT is configured for Hugepages if the following entry is in the /u01/app/oracle/EXALYTICS_MWHOME/TimesTen/tt1122/info/ttendaemon.options file:
-linuxLargePageAlignment 2
So if configured for Hugepages please see this example of how to set an appropriate Hugepages setting:
Total the amount of memory required to accommodate your TimesTen database from /u01/app/oracle/EXALYTICS_MWHOME/TimesTen/tt1122/info/sys.odbc.ini
PermSize+TempSize+LogBufMB+64MB Overhead
For example consider a TimesTen database of size:
PermSize=250000 (unit is MB)
TempSize=100000
LogBufMB=1024
Total Memory = 250000+100000+1024+64 = 351088MB
The Hugepages pagesize on the Exalytics machine is 2048KB or 2MB. Therefore divide the total amount of memory required above in MB by the pagesize of 2MB. This is now the number of Hugepages you need to configure.
351088/2 = 175544
As user root edit the /etc/sysctl.conf file
Add/modify vm.nr_hugepages= to be the number of Hugepages calculated.
vm.nr_hugepages=175544
Add/modify vm.hugetlb_shm_group = 600
This parameter is the group id of the TimesTen instance administrator. In the Exalytics system this is oracle. Determine the group id while logged in as oracle with the following command. In this example it’s 600.
$ id
$ uid=700(oracle) gid=600(oinstall) groups=600(oinstall),601(dba),700(oracle)
As user root edit the /etc/security/limits.conf file
Add/modify the oracle memlock entries so that the fourth field equals the total amount of memory for your TimesTen database. The unit for this value is KB. For example this would be 351088*1024=359514112KB
oracle hard memlock 359514112
oracle soft memlock 359514112
THIS IS VERY IMPORTANT in order for the above changes to take effect you to either shutdown the BI software environment including TimesTen and reboot or issue the following OS command to make the changes permanent.
$ sysctl -p
Please note that dynamic setting (including using 'sysctl -p') of vm.nr_hugepages while the system is up may not give you the full number of Hugepages that you have specified. The only guaranteed way to get the full complement of Hugepages is to reboot.
Check Hugepages has been setup correctly, look for Hugepages_Total
$ cat /proc/meminfo | grep Huge
Based on the example values above you would see the following:
HugePages_Total: 175544
HugePages_Free: 175544

925: Cannot create data store semaphores (Invalid argument)

I'm trying to connect to Timesten, but I'm getting this error.
I have looked at other similar discussions, but yet I could not solve the problem.
[timesten@atd info]$ ttisql "dsn=tpch"
Copyright (c) 1996, 2013, Oracle and/or its affiliates. All rights reserved.
Type ? or "help" for help, type "exit" to quit ttIsql.
connect "dsn=tpch";
925: Cannot create data store semaphores (Invalid argument)
703: Subdaemon connect to data store failed with error TT925
The command failed.
Done.
Here is my information.
[tpch]
Driver=/home_sata/timesten/TimesTen/tt1122/lib/libtten.so
DataStore=/home_sata/timesten/TimesTen/tt1122/tpch/tpch
LogDir=/home_sata/timesten/TimesTen/tt1122/tpch/logs
PermSize=1024
TempSize=512
PLSQL=1
DatabaseCharacterSet=US7ASCII
kernel.sem = 400 32000 512 5029
kernel.shmmax=68719476736
kernel.shmall=16777216
[timesten@atd info]$ cat /proc/meminfo
MemTotal:       297699764 kB
MemFree:        96726036 kB
Buffers:          582996 kB
Cached:         155831636 kB
SwapCached:            0 kB
Active:         115729396 kB
Inactive:       78767560 kB
Active(anon):   44040440 kB
Inactive(anon): 8531544 kB
Active(file):   71688956 kB
Inactive(file): 70236016 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:      112639992 kB
SwapFree:       112639992 kB
Dirty:               160 kB
Writeback:             0 kB
AnonPages:      38082348 kB
Mapped:         15352480 kB
Shmem:          14489676 kB
Slab:            3993152 kB
SReclaimable:    3826768 kB
SUnreclaim:       166384 kB
KernelStack:       18344 kB
PageTables:       245352 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    261457104 kB
Committed_AS:   74033552 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      903384 kB
VmallocChunk:   34205870424 kB
HardwareCorrupted:     0 kB
AnonHugePages: 35538944 kB
HugePages_Total:      32
HugePages_Free:       32
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        6384 kB
DirectMap2M:     2080768 kB
DirectMap1G:    299892736 kB
------ Shared Memory Limits --------
max number of segments = 4096
max seg size (kbytes) = 67108864
max total shared memory (kbytes) = 67108864
min seg size (bytes) = 1

The error message suggests that the system is running out of semaphores although plenty seem to be configured:
kernel.sem = 400 32000 512 5029
Could it be that there are other programs on this machine as this user using semaphores?
Have you made changes to the kernel parameters and haven't made them permanent with
# /sbin/sysctl -p
or a re-boot?
If you've done a # /sbin/sysctl -p have you recycled the TT daemon
$ ttDaemonAdmin -restart
So TT takes up the new settings?
Tim

836: Cannot create data store shared-memory segment, error 22

Hi,
I am hoping that there is an active TimesTen user community out there who could help with this, or the TimesTen support team who hopefully monitor this forum.
I am currently evaluating TimesTen for a global investment organisation. We currently have a large Datawarehouse, where we utilise summary views and query rewrite, but have isolated some data that we would like to store in memory, and then be able to
report on it through a J2EE website.
We are evaluating TimesTen versus developing our own custom cache. Obviously, we would like to go with a packaged solution but we need to ensure that there are no limits in relation to maximum size. Looking through the documentation, it appears that the
only limit on a 64bit system is the actual physical memory on the box. Sounds good, but we want to prove it since we would like to see how the application scales when we store about 30gb (the limit on our UAT environment is 32gb). The ultimate goal is to
see if we can store about 50-60gb in memory.
Is this correct? Or are there any caveats in relation to this?
We have been able to get our Data Store store 8gb of data, but want to increase this. I am assuming that the following error message is due to us not changing the /etc/system on the box:
     836: Cannot create data store shared-memory segment, error 22
     703: Subdaemon connect to data store failed with error TT836
Can somebody from the User community, or an Oracle Times Ten support person recommend what should be changed above to fully utilise the 32gb of memory, and the 12 processors on the box.
Its quite a big deal for us to bounce the UAT unix box, so l want to be sure that l have factored in all changes that would ensure the following:
* Existing Oracle Database instances are not adversely impacted
* We are able to create a Data Store which is able fully utilise the physical memory on the box
* We don't need to change these settings for quite some time, and still be able to complete our evaluation
We are currently in discussion with our in-house Oracle team, but need to complete this process before contacting Oracle directly, but help with the above request would help speed this process up.
The current /etc/system settings are below, and l have put in the current machines settings as comments at the end of each line.
Can you please provide the recommended settings to fully utilise the existing 32gb on the box?
Machine
## I have contrasted the minimum prerequisites for TimesTen and then contrasted it with the machine's current settings:
SunOS uatmachinename 5.9 Generic_118558-11 sun4us sparc FJSV,GPUZC-M
FJSV,SPARC64-V
System Configuration: Sun Microsystems sun4us
Memory size: 32768 Megabytes
12 processors
/etc/system
set rlim_fd_max = 1080                # Not set on the machine
set rlim_fd_cur=4096               # Not set on the machine
set rlim_fd_max=4096                # Not set on the machine
set semsys:seminfo_semmni = 20           # machine has 0x42, Decimal = 66
set semsys:seminfo_semmsl = 512      # machine has 0x81, Decimal = 129
set semsys:seminfo_semmns = 10240      # machine has 0x2101, Decimal = 8449
set semsys:seminfo_semmnu = 10240      # machine has 0x2101, Decimal = 8449
set shmsys:shminfo_shmseg=12           # machine has 1024
set shmsys:shminfo_shmmax = 0x20000000     # machine has 8,589,934,590. The hexidecimal translates into 536,870,912
$ /usr/sbin/sysdef | grep -i sem
sys/sparcv9/semsys
sys/semsys
* IPC Semaphores
66 semaphore identifiers (SEMMNI)
8449 semaphores in system (SEMMNS)
8449 undo structures in system (SEMMNU)
129 max semaphores per id (SEMMSL)
100 max operations per semop call (SEMOPM)
1024 max undo entries per process (SEMUME)
32767 semaphore maximum value (SEMVMX)
16384 adjust on exit max value (SEMAEM)

Hi,
I work for Oracle in the UK and I manage the TimesTen pre-sales support team for EMEA.
Your main problem here is that the value for shmsys:shminfo_shmmax in /etc/system is currently set to 8 Gb therby limiting the maximum size of a single shared memory segment (and hence Timesten datastore) to 8 Gb. You need to increase this to a suitable value (maybe 32 Gb in your case). While you are doing that it would be advisable to increase ny of the other kernel parameters that are currently lower than recommended up to the recommended values. There is no harm in increasing them other possibly than a tiny increase in kernel resources, but with 32 GB of RAM I don't think you need be concerned about that...
You should also be sure that the system has enough swap space configured to supprt a shared memory segment of this size. I would recommend that you have at least 48 GB of swap configured.
TimesTen should detect that you have a multi-CPU machine and adjust its behaviour accordingly but if you want to be absolutely sure you can set SMPOptLevel=1 in the ODBC settings for the datastore.
If you want more direct assistance with your evaluation going forward then please let me know and I will contact you directly. Of course, you are free to continue using this forum if you would prefer.
Regards, Chris

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Hello Experts,
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Solved!
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Hello,
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How create data store with PermSize = 4096MB on HP-UX 64-bit?

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