wlc 4400

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Implement websocket protocol based on node _ node. js

and all files, see the attachment) 1. node server code: Var http = require ('http'); var url = require ('url'); // var mime = require ('mime '); var crypto = require ('crypto'); var port = 4400; var server = http. createServer (); server. listen (port, function () {console. log ('server is running on localhost: ', port); server. on ('connection', function (s) {console. log ('on connection', s );}). on ('request', onrequest ). on ('upgrade', onupgra

Buffercache and sharedpool (5. problem diagnosis summary)

memory to meet the request. This may cause serious performance degradation, set the shared_pool_reserved_size parameter and use the shared_pool_reserved_min_alloc parameter to avoid performance degradation. The ideal value of this parameter should be large enough to meet any memory requests to the reserved list.Instead of refreshing objects from the shared pool. The default value of this parameter is 5% of shared_pool_size. The recommended value of this parameter is 10% ~ of shared_pool_size ~

[Aha! Algorithm: algorithm 2: Bubble Sorting

The running result is 0 1 6 8 15 22 50 100 999 1000 By slightly modifying the code above, you can solve the problems left behind in section 1st, as shown below. # Include Struct student {char name [21]; char score ;}; // a struct is created here to store the name and score int main () {struct student a [100], t; int I, j, n; scanf ("% d", n); // enter a number n for (I = 1; I You can enter the following data for verification: 5huhu 5ha

Group by Table GROUP usage

Group by: group by (EXPRESSION) You can use the group by clause to divide a table into smaller groups. Note: 1. all columns or expressions in the selelct list must appear in the group by clause or group function, but the group by clause can contain columns or expressions not in the select list. The columns in the select list are in the group by clause and group function, so they are successfully executed. SQL> select department_id, avg (salary) from employees 2 group by department_id 3 order by

New Network threat routing attack becomes a network killer

does not affect the normal operation of the network. Through observation, Xiao Zhang found that the computer and switch with a backup database are in a CIDR block. In principle, it should be accessible. This is true after a small remote test. It seems that we need to use this backup database to "peek" the password.After finding a reason, John easily enters the backup database, opens the FTP port, and then easily installs a proxy server. Now let's do something else. John went back to his machine

Watch out for Route attacks and become the network killer

as it does not affect the normal operation of the network. Through observation, Xiao Zhang found that the computer and switch with a backup database are in a CIDR block. In principle, it should be accessible. This is true after a small remote test. It seems that we need to use this backup database to "peek" the password. After finding a reason, John easily enters the backup database, opens the FTP port, and then easily installs a proxy server. Now let's do something else. John went back to his

The Ubuntu touch notebook of System76 can be reserved now!

UbuntuPC manufacturer System76 has released a touch notebook equipped with Ubuntu13.10. DarterUltraThin14.1-inch high-definition notebook equipped with Ubuntu multi-point touch display, with a thickness of 0.9 inch and a weight of about 4.60 (about 2 kilograms ). Surprisingly, although affected by the Linux battery management defect, the battery actually supports 5 hours. In addition to touch screens, traditional input devices such as multi-point touchpad and chocolate keyboard are also provided

MongoDB2.0.3 released

. [SERVER-3817]-Increment opcounters for bulk insert [SERVER-3939]-Rollback is trying to log something in the oplog [SERVER-4115]-copyCollectionFromRemote needs to authenticate [SERVER-4238]-Make sure authentication always happens when a ScopedConn connects [SERVER-4387]-command shocould force reload of config data after multiple stale config exceptions [SERVER-4399]-mongos doesn' t always update shards in response to replica set changes [SERVER-4400]

Self-built high-performance intrusion detection and defense system

MB in size. Ii. Hardware requirements Strata guard has high performance requirements on the dependent hardware, mainly to ensure sufficient network forwarding performance while detecting all network traffic. For the free version of strata guard, we can use the following hardware to customize a hardware platform for the intrusion detection and defense system: Processor: AMD 4400 + Memory: DDR2 667 2 GB Hard Disk: SATA 80 GB NIC: strata guard requires

Oracle default port list

Oracle9iAS Web Cache admin Port 4000 Oracle Application Server Webcache admin GUI or webcache. xml Oracle9iAS Web Cache invalidation Port 4001 Oracle Application Server Webcache admin GUI or webcache. xml Oracle9iAS Web Cache statistics Port 4002 Oracle Application Server Webcache admin GUI or webcache. xml Oracle Internet Directory (SSL)

Programming beauty-2.20 (Program understanding and Time Analysis)

cannot be divisible by one and other numbers. A prime number X can only be divisible by the power below the N-1 of X, and 1 and its own number. Therefore, in the request of A, B, C, D, E ,..., For the minimum public multiples of Z, you only need to divide these numbers into the product between the nth power of the prime number, and take the product of the highest power of each prime factor, that is, the minimum public multiple of these numbers. Example: What are the minimum public multiples of,

Three free PHP accelerators: APC, eaccelerator, and xcache

Environment Hardware: AMD athlon 64x2 dual core processor 4400 + @ 2.2 GHz CPU, 2 GB memory. 160 gb sata hard drive Software: Linux Ubuntu server gutsy 7.10, Apache 2.2.4, MySQL 5.0.45, and PHP 5.2.3 Test command: AB-C5-n3000 http://example.com/(we are using the Apache benchmark (AB) tool with concurrent connections of 5 to requests) 2. Test Results No accelerators: Document path :/Document length: 21757 bytesConcurrency level: 5Time taken

Introduction to ADSL principles and composition

local program-controlled switch.* Service-provided telephone lines: currently, the ADSL service uses a common analog telephone line to provide services that support both voice and data. Some customers once asked if the ISDN line can be converted into an ADSL line. In fact, ISDN provides digital transmission, and ADSL must rely on analog lines.* Voice and data separation/integrator: this is an important part. When the local DSLAM outputs the ADSL line, it is integrated with the local voice line

Windows Phone development environment configuration experience

Although Windows Phone has been released for a long time, I have never tried to configure the development environment. The configuration process has been recorded in the past two days, for more information, see :) Hardware configuration System: Windows 7 Memory: 1.5 GB Video Card: Integrated Video Card nForce 6150SE (6100-430) Hard Disk: ST350041 8AS CPU: AMD Athlon (tm) 64X2 Dual Core Processor 4400 + (Dual Core) Software installed:Microsoft Visual

Debian 6.0.6

Debian 6.0.6 local non-free source creation process description: My work environment cannot be on the Internet, so we need to build a local debian source through DVD burning. Debian can be engraved with main and contrib, and non-free does not have an iso image, because Debian Developer is clean, :-) I have worked hard to cut 8 + 6 disks, it is a sad reminder that the main and contrib are both local and non-free. Here, the creation process of main and contrib local sources is ignored. Www.2cto.co

How to view memory consumption of a single process at the OS level in AIX/LINUX

5696 5904 32768 518 208 0.0/usr/sb3014794-A 01 55 5672 5892 32768 394 220 0.0/usr/sb3145838-A 32 5540 5668 32768 164 128 0.0/usr/sb3080322-A 24 5472 5528 32768 43 56 0.0 0.0/usr/sb4194350-A 412 4708 5248 xx 555 540 0.0 0.0/usr/sb3407976-A 144 4180 5244 32768 1213 1064 0.0 0.0 sendmai3866866-A 129 3792 4400 32768 524 608 0.0 0.0/usr/sb2424972-A 76 4204 4384 32768 151 180 0.0/usr/sb $ Aix, linux --------------- this is recommended $ Ps aux | head-1;

Shared pool 2: free lists/shared pool lru list

greatly reduced. Note: If a large number of small free chunks appear in the shared pool, the share pool latch contention will occur, even if the size of the shared pool is increased, this problem may occur over time.Reserved free lists:The number of buckets on the reserved free lists is 15.Keep free lists. When the CHUNK required by the SQL statement is greater than 4400bytes, the idle CHUNK will be searched in RESERVED FREE LISTS.If the CHUNK required by the SQL statement is no greater than 44

Oracle DB groups rows-group by and having

; SELECT department_id, AVG (salary) FROM employees group by department_id order by avg (salary );DEPARTMENT_ID AVG (SALARY)------------------------50 3475.5555630 415010 440060 576040 65007000100 8601.3333380 8955.8823520 950070 10000110 1015490 19333.333312 rows selected. Group by multiple columns Sometimes, you need to view the results of each group in the group.Hr @ TEST0924> SELECT department_id, job_id, sum (salary) FROM employees group by department_id, job_id order by job_i

Determination of large data volume in SQL

In the design of database applications, we often need to obtain the total number of records in some tables to determine whether the total number of records in the table is too large and whether data needs to be backed up. Our common practice is: Select count (*) as C from tablea. However, for tables with a large number of records, the above practice will be very time-consuming. In a test on a Dell 4400 server, the MS sqlserver 2000 database executes t

Cordova 3.x BASICS (3) -- debug the debug tool

Cordova 3.x BASICS (3) -- debug the debug tool (1) ripple emulatorIt is a mobile application Simulator Based on Google Chrome and has been donated to ASF. Apache ripple: http://ripple.incubator.apache.org/Chrome WebStore installation address:Https://chrome.google.com/webstore/detail/geelfhphabnejjhdalkjhgipohgpdnocInstall ripple emulator Reference NPM install-G ripple-emulator Create an android test project app1 Reference Cordova create app1CD app1Cordova platform add android Start ripple

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