shared memory segment

Linux ways to set kernel parameters1 How to view kernel parametersUse the "sysctl-a" command to view all kernel parameters that are in use. Kernel parameters are more (generally up to 500 items), according to the prefix is divided into the following

Shared memory: A piece of memory reserved by the kernel space for interprocess communicationShared memory is one of the most efficient inter-process communication methods, because the process can read and write memory directly, does not require any

Introduction Configuring Hugepages Force Oracle to use Hugepages (use_large_pages) disabling Transparent hugepages (RHEL6/OL6) Configuring 1G Hugepagesize Introduction For large SGA sizes, hugepages can give substantial benefits

ORA-27102: out of memory fault recent UAT database migration, because multiple databases need to be migrated to the same machine, after part of the completion, start the subsequent database encountered a ORA-27102 error, prompt memory exceeds, view

Install Oracle10g notes on RedHat Enterprise 5.8. Note: Write ldquo In the first line of redhat Enterprise 5; 127.0.0.1 host name alias rdquo; check is not passed Install Oracle 10g notes on RedHat Enterprise 5.8. Note: Write ldquo In the first line

The latest UAT database migration, because multiple databases need to be migrated to the same machine, after part of the completion, start the subsequent database encountered a ORA-27102 error, prompt memory exceeds, check The latest UAT database

The installation of the OracleRAC database is more complex than that of a standalone database, because the entire installation process involves network, operating system, and storage. Improper configuration of one link may cause installation failure.

This is also the note I wrote on the millionaire forum. I will share it with you today:Http://www.delphibbs.com/keylife/iblog_show.asp? Xid = 6526 :--- Experience in installing oracle9.2.0 in RedHat Linux9 Author: jrq Abstract: This article

1) obtain the semaphore identifier int semget (key_t key, int nsems, int flag)2) operation semaphore (initialization, deletion, etc.) int semctl (INT Semid, int semnum, int cmd,/* Union semun */)3) increase or decrease the semaphores. The operation

  ========================= Inter-process communication ========================== ====== Review:1. Timer1. Struct itimerval {struct tiemval it_interval; // interval: returns a signal once at an interval of X. struct timeval xxx...; // start time:

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# Pragma data_seg Introduction Use # pragma data_seg to create a new data segment and define shared data. The specific format is:# Pragma data_seg ("shareddata ")Hwnd sharedwnd = NULL; // share data# Pragma data_seg ()Bytes -----------------

This article mainly introduces two sets of PHPAPC configuration files and detailed descriptions of parameters. For more information, see This article mainly introduces two sets of php apc configuration files and detailed descriptions of parameters.

Ask questions about memory sharing! The code is as follows: This code reports an error. what is the problem? PHP Warning: shmop_read (): no shared memory segment with an id of [1946257823] in/home/admin/codes/php/shmop/client. php on line

The following are common php shared memory functions used for inter-process communication. Shm_attach-Creates or open a shared memory segmentShm_detach-Disconnects from shared memory segmentShm_get_var-Returns a variable from shared

Inter-process communication (4)-shared memory, Process Communication shared memory I will use several blogs to summarize several methods of communication between processes in Linux. I will write the summary at the beginning in each blog of this

Recent UAT database migration, because multiple databases need to be migrated to the same machine, after part of the completion, start the subsequent database encountered a ORA-27102 error, prompting that the memory exceeds, view the system

Note: Que1: Generally, When configuring kernel parameters (gedit/etc/sysctl. conf), we only need to modify kernel. shmmax. 1 is half of the physical memory: Physical memory grep MemTotal/proc/meminfo The Unit is byte. (B) 3 It is recommended that

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Linux memory basic knowledge and related tuning solutions, linux TuningMemory is one of the important components in the computer and serves as a bridge to communicate with the CPU. All programs in the computer run in the memory, so the memory