Error Creating Semaphore Solaris
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or outdated Difficult to follow Other Comments:(Max 1000 chars) Would you like a response? Email is required. Email: KB00463 - APIBUFFER: Error creating semaphore handle - solaris 10 semaphore errno is 28 on UNIX Solaris Product: API Buffer Server /
Solaris Semaphore Limit
PI API Version(s): N/A Platform: UNIX Issue How do I resolve the following error on UNIX (Solaris)? bufutil>PI-API> linux semaphore APIBUFFER: Error creating semaphore handle - errno is 28 Solution Increase the maximum number of semaphores or decrease the number of active semaphores. You can remove orphan shared memory
Unix Semaphore
segments and semaphores with the ipcrm command. ipcs (Inter-Process Communication Status) is a resource checking tool on UNIX systems. ipcrm -m
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/dev/ksyms /dev/mem
parameter-name/D
^D (to exit) In Solaris 10, most of the shared memory, semaphore and message queue parameters have been https://www.princeton.edu/~unix/Solaris/troubleshoot/ipc.html removed and the remaining controls moved to project-based resource controls. (See the project, http://www.dba-oracle.com/unix_linux/semaphore_management.htm prctl and getrctl man pages for detailed information.) Many of the maximum parameter values discussed below represent 32-bit limits on integer size for Solaris 2.6 and 2.5.1. In Solaris 7+, these limits have been lifted somewhat. In theory, the maximums for Solaris 7+ would be in the 16 EB (exabytes) range rather error creating than 2 GB (for Solaris 2.6 and 2.5.1). In practice, implementation details limit the range to something like 16 TB (terabytes). Due to the memory used by the kernel to set up space for the structures governed by these parameters, it is important to think about the useage of the resource before tuning it. In most cases, the 32-bit limits provide more than adequate head room error creating semaphore for growth. Shared memory, semaphores and message queues are only enabled if the appropriate kernel modules are loaded. These are automatically loaded if certain IPC functions are called, but they can also be forced to load via /etc/system forceload commands or root modload commands. Each of these three facilities runs on top of the /kernel/misc/ipc module. Shared memory connects to the ipc module via /kernel/sys/shmsys, semaphores connect via /kernel/sys/semsys and message queues connect via /kernel/sys/msgsys. For Solaris 2.5.1-9, the module names will need to be included when setting these parameters in the /etc/system file. For example: set shmsys:parameter=value Solaris 10 sets the parameters for these facilities via the project interface. Other IPC mechanisms exist (such as named pipes), but they are not tuneable in the sense of this discussion. Each IPC resource has at least these attributes: key (identifies this instance of the resource), creator (UID/GID of the creating process), owner (UID/GID of the resource owner), and permissions (similar to filesystem read/write/execute owner/group/other permissions). Each object is created by calling the appropriate *get function ( shmget / semget / msgget ) with the desired key. If no objects of that type with that key exi
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Oracle Semaphore Management in UNIX Administration Oracle UNIX/Linux Tips by Burleson Consulting Semaphores and Oracle 11g Semaphores are data structures within the operating system that function like signals for memory process communications. For Oracle, semaphores tell the Oracle processes when to stop, wait or start operations. In addition, semaphores tell Oracle processes when they are to resume processing. Each Oracle process has its own semaphore assigned to it. For example, DBWR (Database Writer process) needs to flush the database buffer cache to write to the data files on disk. When it is time for DBWR to perform this task, DBWR semaphore signals to DBWR to flush the data from the buffer out to disk. With System V implementations and variations of the UNIX and LINUX operating system, some of the key parameters that manage the use and allocation of semaphores with Oracle 11g exist in the following operating system level parameters: SEMMNS: number of semaphores in the operating system. SEMMSL: size limit for a single semaphore set. SEMMNI: number of semaphore set identifiers in the operating system. SEMMNU: number of semaphore undo structures in the operating system. The output of semaphores can be viewed by using the ipcs command for UNIX and Linux platforms as will be observed in the following section on shared memory and Oracle 11g. Semaphore Management in UNIX A semaphore is a term used for a signal flag used by the Navy to communicate between ships. In some dialects of UNIX, semaphores are used by Oracle to serialize internal Oracle processes and guarantee that one thin