Shared Memory Segments

I am trying to install the Oracle 8.1.6 database that came with the Solaris 8 Intel package. In the installation it is necessary to set the Shared Memory Segments. An example of how to do this is found in the Solaris 8 System Admin Guide Vol 2 on page 465. There is a line:
"set shmsys:shinfo_shmmax = 268435456".
My question is how is "268435456" computed or what is it related to? Can someone give me a formula to calculate this from megabytes?
The Oracle documentation was also vague in this area. Their example simply gave a number also, which is a minimal amount required for the database. There was no explanation of how is was actually computed.
Thanks in advance.
George R. Sealy
ISS

Hi,
As per
http://docs.sun.com/ab2/coll.707.1/SOLTUNEPARAMREF/%40Ab2PageView/6980?DwebQuery=shmmax&oqt=shmmax&Ab2Lang=C&Ab2Enc=iso-8859-1
its unit is bytes. Therefore above value is 256Mbytes.
Thanks
Kalpesh

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    [email protected]

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    Alan
    Sun Developer Technical Support
    http://www.sun.com/developers/support

  • Cannot attach data store shared-memory segment using JDBC (TT0837)

    I'm currently evaluating TimesTen during which I've encountered some problems.
    All of the sudden my small Java app fails to connect to the TT data source.
    Though I can still connect to the data source using ttisql.
    Everything worked without problems until I started poking around in the ODBC administrator (Windows 2K).
    I wanted to increase permanent data size so I changed some of the parameters.
    After that my Java app fails to connect with the following message:
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    trying driver[className=com.timesten.jdbc.TimesTenDriver,com.timesten.jdbc.TimesTenDriver@addbf1]
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    Peter,
    Not sure if you have resolved this issue or not. In any case, here are some information to look into.
    - On Windows 32-bit, the allocation of shared data segment doesn't work the same way like on Unix and Linux. As a result, the maximum TimesTen database size one can allocate is much smaller on the Windows platform than on other platforms.
    - Windows error 8 means ERROR_NOT_ENOUGH_MEMORY: not enough storage is available to process this command.
    - TimesTen TT0837 says the system was unable to attach a shared memory segment during a data store creation or data store connection operation.
    - What was the largest successful perm-size and temp-size you used when allocating the TimesTen database?
    * One explanation for why you were able to connect using ttIsql is that it doesn't use much of the DLLs, whereas your Java application typically has a lot more DLLs.
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    By the way the TimesTen documentation has been modified to document this error as follows:
    Unable to attach to a shared memory segment during a data store creation or data store connection operation.
    You will receive this error if a process cannot attach to the shared memory segment for the data store.
    On UNIX or Linux systems, the shmat call can fail due to one of:
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    - The system cannot allocate memory to keep track of the allocation, or there is not enough data space to fit the segment. In this case the system error code is ENOMEM.
    - The attach exceeds the system limit on the number of shared memory segments for the process. In this case the system error code is EMFILE.
    It is possible that some UNIX or Linux systems will have additional possible causes for the error. The shmat man page lists the possibilities.
    On Windows systems, the error could occur because of one of these reasons:
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    - The system has no handles available.
    - The segment cannot be fit into the data section
    Hope this helps.
    -scheung

  • 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

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