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Oracle11g AMM memory management mode is to use devshm, so sometimes modify MEMORY_TARGET or MEMORY_MAX_TARGET will have a ORA-00845 error, in the security Oracle 11g AMM memory management mode is to use/dev/shm, so sometimes modify MEMORY_TARGET or MEMORY_MAX_TARGET will have a ORA-00845 error, in the security In Linux, the following error occurs when Oracle 11.2.0.4 starts an instance:SQL> startup nomount pfile =/u03/app/oracle/11.2.0/db/dbs/ini
Yum Server LVM expansion, the data directory is Yum storage rpm package directory, only 20G, need to add disk expansion to 80G # DF-LH Filesystem Size used Avail use% mounted on /dev/mapper/vg_node5-root 20G 479M 18G 3%/ Tmpfs 935M 0 935M 0%/dev/shm /DEV/SDA1 485M 39M 421M 9%/boot /dev/mapper/vg_node5-data 20G 172M 1
Excerpt from: http://miaozk2006.blog.163.com/blog/static/3824705820111028183996/First,/dev/shm/Introduction:/dev/shm/is a very useful directory for Linux because it is not on the hard disk, but in memory. Therefore, under Linux, it is not necessary to build RAMDisk, the direct use of/dev/shm/can achieve a good optimization effect.One of the/
This article goes from http://www.kissyu.org/backgroundWe can often find such statements in a shell script >/dev/null 2>1 . Before I did not go into the role of this command, copy replicable, until last week I wrote this order accidentally 2>1 >/dev/null , a little problem, I began to understand the "mystery" behind the order.Shell Redirection IntroductionJust like the program we write, a program handles th
A gb storage space is shared on the storage and mapped to the Linux system. The environment consists of two nodes. I. Test 1: Mount directly Format with fdisk as follows: [Root @ Rac1 u01] # fdisk-l ...... Disk/dev/SDK: 536.8 GB, 536870912000 bytes 255 heads, 63 sectors/track, 65270 Cylinders Units = cylinders of 16065*512 = 8225280 bytes Device boot start end blocks ID system /Dev/sdk1 1 65270 524281243 +
A 500G space is shared on the storage, mapped to the Linux system offering, and the environment is made up of 2 nodes. one. Test one: Direct Mount After the format of Fdisk is as follows: [Root@rac1 u01]# Fdisk-l ...... disk/dev/sdk:536.8 GB, 536870912000 bytes 255 heads, Sectors/track, 65270cylinders Units = Cylinders of 16065 * 8225280bytes Device Boot Start End Blocks Id System /DEV/SDK1 1 65270 5242812
Control terminal (/dev/tty) The console terminal (/dev/ttyn,/dev/console) can be switched using ALT + [F1-F6] keys Virtual terminal (/dev/pts/n) Pseudo Terminal in xwindows Mode Q: What is/dev/console?A:/dev/console refers to
Standard output input device stdinDetailed analysis of Linux shell data redirection (input redirection and output redirection). They correspond to several special file descriptors, FD0,FD1,FD2 (Stdin,stdout,stderr)Such as:[Email protected] shell]$ Cat>teststdinTest#ctrl +d#cat从/dev/stdin get the data and then the standard output, the input to the Teststdin file[email protected] shell]$ cat TeststdinTest[Email protected] shell]$ Cat>teststdinTest#ctrl
The shell can often be seen: >/dev/null 2>1The result of the command can be defined in the form of a%> output/dev/null represents an empty device fileWhere does the > delegate redirect to, for example: echo "123" >/home/123.txt1 means stdout standard output, the system default is 1, so ">/dev/null" is equivalent to "1>/dev
Transfer from http://blog.chinaunix.net/uid-25100840-id-3271224.html a few days ago interview has such a question, more strange: Explain the meaning of >/dev/null 2>1: I was scratching, also did not think out, wrote a clear buffer, hehe online search, as follows: http://wangqiaowqo.iteye.com/blog/1354226 but I only looked at the following paragraph, the back did not see {shell may often see: >/dev/null 2>1T
Under Linux, the/dev directory is important and the various devices are below. Here's a brief summary:DEV is the acronym for Devices./dev This directory is important for all users. Because this directory contains all the external devices that are used in Linux systems . But this is not the driver for the external device , This is not the same as the Window,dos operating system . It is actually a port that a
Dev is the abbreviation of device. The/dev directory is very important to all users. This directory contains all external devices used in Linux. However, this is not the driver of the external device, which is different from the windows and DOS operating systems. It is actually a port that accesses these external devices. We can easily access these external devices, and there is no difference between access
Under Linux, the/dev directory is important and the various devices are below. Dev is the abbreviation for device, which means devices. /dev This directory is important for all users, because this directory contains all the external devices used in the Linux system.But here is not the driver for the external device, which is not the same as windows, it is actuall
[Step 1] Welcome to Dev-C ++ install program. Please do not install this version of Dev-C ++ over an existing installation. [OK] Welcome to develop the dev-C ++ installer. Do not overwrite the existing installation with Dev-C ++ of this version. [OK] ========================================================== =========
Name Random, urandom-kernel random number source DevicesDescription The character special files/Dev/randomAnd/Dev/urandom(Present since Linux 1.3.30) provide an interface to the kernel's random number generator. File/Dev/randomHas Major device number 1 and minor device number 8. File/Dev/urandomHas Major device number
reduce the file system and free the VM resources, of course, when the file is created in the dynamic allocation of VM resources. In addition, the TMPFS does not have persistence, and the data is not retained after rebooting, for obvious reasons, it is memory-based.When compiling the kernel, enable Virtual memory file system support to use Tmpfs,linux kernel to start supporting TMPFS from 2.4 onwards. The current mainstream Linux system is enabled by default TMPFS, such as Redhat.What is/
One,/DEV/SHM concept /DEV/SHM is a TMPFS file system, a temporary file system, is a memory-based file system, which means that files in/dev/shm are written directly into memory without taking up hard disk space. Under CentOS and Redhat, the/DEV/SHM directory is a link to the/RUN/SHM directory, under the Ub
Install Gtkmm 1. First install dev-cpp 2. then install the latest gtkmm2.4 from http://www.pcpm.ucl.ac.be /~ Gustin/win32_ports/index.html The development environment without gtk2.4 is automatically detected during the installation process, and the installation program is automatically downloaded. Note: Install both environments in the main directory of dev-cpp, for example, d:/
The device under/proc/devices/is generated by the driver, which can generate a major for mknod as the parameter.The devices under/dev/are added by mknod. You can use this device name to access the driver.The following script, scull_load, is part of the scull distribution. The user of a driver that is distributed in the form of a module can invoke such a script from the system'sRC. LocalFile or call it manually whenever the module is needed.#! /Bin/shM
Use the Linux server/dev/shm/to release the disk pressure Browse:646 | Updated: 2013-06-18 18:08 | Tags: disk TMPFS is a memory-based file system on the Linux/unix system. TMPFS can use your memory or swap partition to store files. Thus, TMPFS primarily stores staged files. It has the following 2 advantages: 1. The size of the dynamic file system. 2. Another major benefit of TMPFS is its lightning-fast speed. Because a t
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