system of the array machine, and the other layer is the range recognized by the operating system of the server. These two layers are relatively independent, because if we regard storage as a host, it naturally has its own device, target, Lun, and the server also has its own device, target and Lun. On the other hand, these two layers are interrelated. Most of the control systems of an array have virtualization
recently there are plans to assemble a computer friend, asked a small series of such a question: DIY assembly computer What brand good? In fact, DIY computer machine does not have any brand problems, unless the brand desktop computer. However, think about it, DIY computer contains the CPU, graphics, motherboards, memory, hard disk, chassis, power supply and monitor hardware, each individual DIY hardware
One, what is the system average load (load average)?In the Linux system, uptime, W, top and other commands will have the average load average output of the system, then what is the average system load?Load Average is the load of the CPU
Many of my friends may not know what is the difference between a 32-bit Windows 7 system and a 64-bit system. I will introduce it to you in detail.
The 64-bit Windows 7 system is selected because the memory size is larger than or equal to 4 GB. In 32-bit Windows 7, the memory usage may be 3.xxg. The addressable memory
What is the relationship between East-West traffic and SDN?
The relationship between East-West traffic in the data center and SDN is reflected in the fact that many SDN solutions are designed to address the challenges posed by such dynamic traffic. There is no shortage in the network industry to discuss the relationsh
is so large is that many companies are using Docker at an alarming rate. At this July's Open source Conference (OSCon), I encountered countless businesses that had already moved server applications from virtual machines (VMS) to containers. Indeed, James Turnbull, vice president of Docker's executive services and support, told me at the meeting that three of the big banks have been using Docker's beta vers
Sendmai and qmail services to build mail servers, using NFS and iSCSI to build network storage server, Linux in the enterprise application of a very wide range. Linux supports multiple users, each user has their own special rights to the file device, to ensure that the user does not affect each other. Multitasking is one of the most important features of computers now, and Linux allows multiple programs to run simultaneously and independently.In the
The system name is barebone or bare system. It is a brand new computer. It is different from a notebook or a desktop, and its size is between a desktop and a notebook. Generally, the admission system only has accessories such as chassis, motherboard power supply, and motherboard. There are no accessories with changing
This is summed up by colleagues, I added a number of items, not original, but this is not seen elsewhere, here right vote as original. There is a software architecture diagram behind it. See the missing classmate can add
What is it:information-Information technology-Technol
, to see if it is restored. If you do not know, Baidu to see what things, can end the process, there is no suggestion on the network.
5, good. Is there any fool-like real-time protection and cleaning system memory software? An optimization master can be applied to optimize the memory finishing function of
between them.
More threads require more memory space.
Threads may bring more "bugs" to your program, so use them with care.
The termination of a thread requires consideration of its impact on the program's operation.
Typically, block model data is shared across multiple threads, and it is necessary to prevent thread deadlock situations from occurring.
Summarize:the differ
1: To understand multi-threading, you must first understand the thread, and to understand the thread, you must first understand the process, because the thread is dependent on the process and exists.2: What is a process?Through the Task Manager we see the existence of the process.By observing, we find that only the running program will appear.Process:
sessions are running:
break on SID Skip 1
column SID format 99999
column Sql_text form A64
Select A.sid, A.last_call_et, B.sql_text
from V$session a
, V$sqltext b
where a.username is not null
and a.status = ' ACTIVE '
and a.sql_address = b.address
ORDER by A.last_call_et,a.sid,b.piece;
This gives us the statement and how long we are currently running, and you should be able to see which session you need to check.
,
Although this is a foreign translation article at the beginning of 99, many contents are also suitable for today's DBA.In recent years, I have been dealing with database administrators and have directly interviewed many DBA jobs. This article will summarize the requirements of the IT industry for DBAs and the new status of domestic DBAs. Certainly, it is a good job to be a senior DBA. If you want to becom
Tags: center how much gets through reads memory scheme sleep state CTI Thread_pool and Connection_pool When the client requests a large amount of data, using the thread pool can save a lot of system resources, so that more CPU time and memory can be effectively utilized. And the use of database connection pool will greatly improve the efficiency of the program, at the same time, we can through its own management mechanism to monitor the number of data
directly modify the class on the line, the modification of all guest Client software has been modified. shown in 2 14. 6. Is this deployment impeccable? The "service cluster" shown in Figure 2 14 looks "invulnerable", in fact, it is not a picture of the complete, we comeComplete the picture and see what the problem is
processes, the system returns a list of these:
Copy Code code as follows:
Handles NPM (k) PM (k) WS (k) VM (M) CPU (s) Id ProcessName
------- ------ ----- ----- ----- ------ -- -----------
318 8 12948 3872 1728 applemobiled
5 13816 13328 6920 AUDIODG
1315 11732 10988 108 2544 ccmexec
... ...
Although it appears to be a general format text, it is actually an array, and each array eleme
rich modular system that allows, combine and create a large set of illumination methods s Uch as Phong shading, point and directional lighting, cascading shadows, normal and specular mapping, global illumination, Fog and rimlighting effects and much, much more.Robust Scene Map (robust scenegraph)
The Away3d rendering pipeline implements a highly optimized scene map that allows you to easily create a complex, nested, multi-level scene. Its built-in cropping and culling algorithms ensure th
. As the theoretical basis of VR matures and the related industrial chain is becoming more and more complete, 2016 was defined as the age of virtual reality. In this connection, the CEO of Victor Koo in an interview at the Internet Conference, also that the virtual reality is an inevitable trend, the world to see the cultural entertainment, education, health care will have a great change. The dominance of W
This article is written for people who have not been exposed to a Linux system. Understanding the Linux system is necessary for a technology (even if it is not directly related to the computer), but for the general user, only to understand Windows is enough, but to understand the Linux system I think it
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