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• PHP/Zend: How to remove all chars from a string and keep only numbers.

  - by Awan

  I want to keep only numbers and remove all characters from a variable. For example: input: +012-(34).56.(ASD)+:"{}|78*9 output: 0123456789

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• Is there a method / system / program to keep track of diffirent stages and changes in writing the co

  - by Luay

  forgive me, but I don't know the technical term to know what to search for. I am trying to find a way to keep track of changes in my code during the development of my program. something that would allow me to go back to a section of code that I deleted. I am not talking about "undo". But rather a way that would let me keep track or be able to retrieve a section of my code that I deleted but now want it back. Is there such a way. If there is, then what is this whole system/procedure called? Is there something that integrates with visual studio 2010? Many thanks for your help.

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• How can keep track of the index path of a button in a tableview cell?

  - by Jake

  I have a table view where each cell has a button accessory view. The table is managed by a fatchedresults controller and is frequently reordered. I want to be able to press a button and be able to obtain the index path of the pressed button's tableviewcell. I've been trying to get this working for days by storing the row of the button in it's tag, but when the table get's reordered the row becomes incorrect and I keep failing at reordering the tags correctly when a change is made. Any new ideas on how to keep track of the button's cell's index path? Thanks so much for any help.

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• How to keep statefull web clients in sync, when multiple clients are looking at the same data?

  - by Hilbrand

  In a RIA web client, created with GWT, the state is maintained in the web client, while the server is (almost) stateless (this is the preferred technique to keep the site scalable). However, if multiple users looking at the same data in their browser and one user changes something, which is send to the server and stored in the database, the other users still have the old data in their browser state. For example a tree is shown and one of the users adds/removes an item from the tree. Since there can be a lot of state in the client, what is the best technique to keep the state in the clients in sync? Are there any java frameworks that take care of this?

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• How can I keep up to date on the latest web development standards?

  - by Structure

  First off, I know that this question begs the other question - should the latest web development standards be followed and further will they remain relevant? That aside, I am focused on GUI development, usability, etc. Front-end web development that utilizes XHTML, CSS, JavaScript, etc. I know there are many gurus and thought leaders out there but with my projects I simply do not always have time to follow them all and keep up with the latest development standards. However, this is obviously very important. So how can I keep myself up to date on the latest web development standards while maintaining productivity? Are there any specific groups or organizations to monitor for this? Best practices that one might follow?

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• How to keep the first result of a function from Prolog?

  - by zuhakasa

  I need to write a customized function that will be called many times by other fixed functions. In this function, at the first called time, it will return the total number of lines of a file. The second called time of this function, forward, will return the number of lines in small sections of this file. My question is how I keep the first returned result(total number of lines of a file) and use it for the next called times of my function. I need to write or declare any thing only in this function(not in the caller). Something like this: myFunction(Input, MyResult, FirstResult) :- calculateInputFunction(Input, Result), !, MyResult is Result, ... . The problem is, every time myFunction is called, it receives different Input and returns different MyResult. But I would like to keep the first MyResult to use for next called times of myFunction. How can I do that? Thanks very much for your answer in advance.

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• Should i keep #wrapper{ width:100%} in print css?

  - by metal-gear-solid

  Should i keep #wrapper{ width:100%} in print css? because on screen my design is a fixed width design 960 px. but there are so many paper type and sizes in the world and anybody can take print on any size paper, bigger and smaller. So if in print css i do not specify relative width then i think print of page will cut of from right size if user will take print on the paper size which can smaller or larger width than my site #wrapper width (960px). then it can create problem. http://www.dpandi.com/paper/index.html printer also leave some margin when printing. So should keep everything is relative size in print css?

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• TCP RST Reset Every 5 Minutes on Windows 2003 sp2

  - by Dan

  Hey, Recently I had a web developer come to me and ask why he was receiving connection errors in his app that was accessing a sql database. So, I went through my normal trouble shooting steps to isolate or reproduce the issue. I discovered that if I connected to the database using Query Analyzer and let the connection idle for 5 minutes it would disconnect. Meaning... I would no longer be able to refresh my tables or any other object/node within the object browser in Query Analyzer. I would have to right click on the instance and refresh for it to re-establish the connection. Next I went to wireshark and ran a capture on the client pc's nic card. Sure enough it was receiving a TCP RST reset every 5 min if the connection idled longer than 5 min. I also ran a capture on the SQL Server and noticed the TCP RST reset command as well. Attached below is the capture from the client Machine. If someone could please assist... That would be great. -I checked all settings within SQL Server 2000 against another server and they all seem to be the same. -Issue does not occur if I connect to any other SQL server 2000 server. -Issue does not occur if connecting to SQL on the server itself... so only over the network. -I consulted with network team and this is the response back: There are no firewalls or proxies in between SQL Server and your desktop. The traffic flows like this: Desktop-Access Switch-Distro Switch-Core Switch-Datacenter Switch-SQL Server None of the switches have security ACL’s configured on them. Also they stated that NAT was not turned on. -Issue does not occur with SQL server Enterprise Manager. -Ran SQL Profiler at the same time and did not see anything out of the ordinary during the RST I HAVE SEARCHED HIGH AND LOW ON GOOGLE FOR A RESOLUTION FOR THIS ISSUE. NO LUCK! My questions are: What could be causing this? Wrong Sequence number? setting in a router or switch the network team may have over looked? Setting within Windows? Setting within SQL Server 2000 that I have over looked? Better way to utilize Wireshark to find more answers? RST is about 10 from the bottom. No. Time Source Destination Protocol Info 258 24.390708 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [SYN] Seq=0 Len=0 MSS=1260 259 24.401679 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [SYN, ACK] Seq=0 Ack=1 Win=64240 Len=0 MSS=1460 260 24.401729 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [ACK] Seq=1 Ack=1 Win=65535 [TCP CHECKSUM INCORRECT] Len=0 261 24.402212 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [PSH, ACK] Seq=1 Ack=1 Win=65535 [TCP CHECKSUM INCORRECT] Len=42 262 24.413335 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [PSH, ACK] Seq=1 Ack=43 Win=64198 Len=37 285 24.466512 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [ACK] Seq=43 Ack=38 Win=65498 [TCP CHECKSUM INCORRECT] Len=1260 286 24.466536 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [PSH, ACK] Seq=1303 Ack=38 Win=65498 [TCP CHECKSUM INCORRECT] Len=437 289 24.478168 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [ACK] Seq=38 Ack=1740 Win=64240 Len=0 290 24.480078 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [PSH, ACK] Seq=38 Ack=1740 Win=64240 Len=385 293 24.493629 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [PSH, ACK] Seq=1740 Ack=423 Win=65113 [TCP CHECKSUM INCORRECT] Len=60 294 24.504637 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [PSH, ACK] Seq=423 Ack=1800 Win=64180 Len=17 295 24.533197 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [PSH, ACK] Seq=1800 Ack=440 Win=65096 [TCP CHECKSUM INCORRECT] Len=44 296 24.544098 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [PSH, ACK] Seq=440 Ack=1844 Win=64136 Len=17 297 24.544524 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [PSH, ACK] Seq=1844 Ack=457 Win=65079 [TCP CHECKSUM INCORRECT] Len=58 298 24.558033 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [PSH, ACK] Seq=457 Ack=1902 Win=64078 Len=31 299 24.558493 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [PSH, ACK] Seq=1902 Ack=488 Win=65048 [TCP CHECKSUM INCORRECT] Len=92 300 24.569984 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [PSH, ACK] Seq=488 Ack=1994 Win=63986 Len=70 301 24.577395 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [PSH, ACK] Seq=1994 Ack=558 Win=64978 [TCP CHECKSUM INCORRECT] Len=448 303 24.589834 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [PSH, ACK] Seq=558 Ack=2442 Win=63538 Len=64 304 24.590122 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [FIN, ACK] Seq=2442 Ack=622 Win=64914 [TCP CHECKSUM INCORRECT] Len=0 305 24.601094 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [ACK] Seq=622 Ack=2443 Win=63538 Len=0 306 24.601659 x.x.x.10 x.x.x.99 TCP 2226 > 14488 [FIN, ACK] Seq=622 Ack=2443 Win=63538 Len=0 307 24.601686 x.x.x.99 x.x.x.10 TCP 14488 > 2226 [ACK] Seq=2443 Ack=623 Win=64914 [TCP CHECKSUM INCORRECT] Len=0 321 25.839371 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [SYN] Seq=0 Len=0 MSS=1260 322 25.850291 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [SYN, ACK] Seq=0 Ack=1 Win=64240 Len=0 MSS=1460 323 25.850321 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [ACK] Seq=1 Ack=1 Win=65535 [TCP CHECKSUM INCORRECT] Len=0 324 25.850660 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=1 Ack=1 Win=65535 [TCP CHECKSUM INCORRECT] Len=42 325 25.861573 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=1 Ack=43 Win=64198 Len=37 326 25.863103 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [ACK] Seq=43 Ack=38 Win=65498 [TCP CHECKSUM INCORRECT] Len=1260 327 25.863130 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=1303 Ack=38 Win=65498 [TCP CHECKSUM INCORRECT] Len=463 328 25.874417 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [ACK] Seq=38 Ack=1766 Win=64240 Len=0 329 25.876315 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=38 Ack=1766 Win=64240 Len=385 330 25.876905 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=1766 Ack=423 Win=65113 [TCP CHECKSUM INCORRECT] Len=60 331 25.887773 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=423 Ack=1826 Win=64180 Len=17 332 25.888299 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=1826 Ack=440 Win=65096 [TCP CHECKSUM INCORRECT] Len=44 333 25.899169 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=440 Ack=1870 Win=64136 Len=17 334 25.899574 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=1870 Ack=457 Win=65079 [TCP CHECKSUM INCORRECT] Len=58 335 25.910618 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=457 Ack=1928 Win=64078 Len=31 336 25.911051 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=1928 Ack=488 Win=65048 [TCP CHECKSUM INCORRECT] Len=92 337 25.922068 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=488 Ack=2020 Win=63986 Len=70 338 25.922500 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2020 Ack=558 Win=64978 [TCP CHECKSUM INCORRECT] Len=34 339 25.933621 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=558 Ack=2054 Win=63952 Len=29 340 25.941165 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2054 Ack=587 Win=64949 [TCP CHECKSUM INCORRECT] Len=54 341 25.952164 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=587 Ack=2108 Win=63898 Len=17 342 25.952993 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2108 Ack=604 Win=64932 [TCP CHECKSUM INCORRECT] Len=72 343 25.963889 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=604 Ack=2180 Win=63826 Len=17 344 25.964366 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2180 Ack=621 Win=64915 [TCP CHECKSUM INCORRECT] Len=52 345 25.975253 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=621 Ack=2232 Win=63774 Len=17 346 25.975590 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2232 Ack=638 Win=64898 [TCP CHECKSUM INCORRECT] Len=32 347 25.986588 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=638 Ack=2264 Win=63742 Len=167 348 25.987262 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2264 Ack=805 Win=64731 [TCP CHECKSUM INCORRECT] Len=512 349 25.998464 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=805 Ack=2776 Win=63230 Len=89 350 25.998861 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2776 Ack=894 Win=64642 [TCP CHECKSUM INCORRECT] Len=46 351 26.009849 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=894 Ack=2822 Win=63184 Len=17 352 26.010175 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2822 Ack=911 Win=64625 [TCP CHECKSUM INCORRECT] Len=80 353 26.021220 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=911 Ack=2902 Win=63104 Len=33 354 26.022613 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [PSH, ACK] Seq=2902 Ack=944 Win=64592 [TCP CHECKSUM INCORRECT] Len=498 355 26.034018 x.x.x.10 x.x.x.99 TCP 2226 > 14492 [PSH, ACK] Seq=944 Ack=3400 Win=64240 Len=89 356 26.046501 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [SYN] Seq=0 Len=0 MSS=1260 357 26.057323 x.x.x.10 x.x.x.99 TCP 2226 > 14493 [SYN, ACK] Seq=0 Ack=1 Win=64240 Len=0 MSS=1460 358 26.057355 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [ACK] Seq=1 Ack=1 Win=65535 [TCP CHECKSUM INCORRECT] Len=0 359 26.057661 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [PSH, ACK] Seq=1 Ack=1 Win=65535 [TCP CHECKSUM INCORRECT] Len=42 361 26.068606 x.x.x.10 x.x.x.99 TCP 2226 > 14493 [PSH, ACK] Seq=1 Ack=43 Win=64198 Len=37 362 26.070087 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [ACK] Seq=43 Ack=38 Win=65498 [TCP CHECKSUM INCORRECT] Len=1260 363 26.070113 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [PSH, ACK] Seq=1303 Ack=38 Win=65498 [TCP CHECKSUM INCORRECT] Len=485 364 26.081336 x.x.x.10 x.x.x.99 TCP 2226 > 14493 [ACK] Seq=38 Ack=1788 Win=64240 Len=0 365 26.083330 x.x.x.10 x.x.x.99 TCP 2226 > 14493 [PSH, ACK] Seq=38 Ack=1788 Win=64240 Len=385 366 26.083943 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [PSH, ACK] Seq=1788 Ack=423 Win=65113 [TCP CHECKSUM INCORRECT] Len=46 368 26.094921 x.x.x.10 x.x.x.99 TCP 2226 > 14493 [PSH, ACK] Seq=423 Ack=1834 Win=64194 Len=17 369 26.095317 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [PSH, ACK] Seq=1834 Ack=440 Win=65096 [TCP CHECKSUM INCORRECT] Len=48 370 26.107553 x.x.x.10 x.x.x.99 TCP 2226 > 14493 [PSH, ACK] Seq=440 Ack=1882 Win=64146 Len=877 371 26.241285 x.x.x.99 x.x.x.10 TCP 14492 > 2226 [ACK] Seq=3400 Ack=1033 Win=64503 [TCP CHECKSUM INCORRECT] Len=0 372 26.241307 x.x.x.99 x.x.x.10 TCP 14493 > 2226 [ACK] Seq=1882 Ack=1317 Win=65535 [TCP CHECKSUM INCORRECT] Len=0 653 55.913838 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 > 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 654 55.924547 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 > 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 910 85.887176 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 > 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 911 85.898010 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 > 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 1155 115.859520 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 1156 115.870285 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 1395 145.934403 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 1396 145.945938 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 1649 175.906767 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 1650 175.917741 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 1887 205.881080 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 1888 205.891818 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 2112 235.854408 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 2113 235.865482 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 2398 265.928342 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 2399 265.939242 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 2671 295.900714 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 2672 295.911590 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 2880 315.705029 x.x.x.10 x.x.x.99 TCP 2226 14493 [RST] Seq=1317 Len=0 2973 325.975607 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive] 14492 2226 [ACK] Seq=3399 Ack=1033 Win=64503 Len=1 2974 325.986337 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive ACK] 2226 14492 [ACK] Seq=1033 Ack=3400 Win=64240 Len=0 2975 326.154327 x.x.x.10 x.x.x.99 TCP [TCP Keep-Alive] 2226 14492 [ACK] Seq=1032 Ack=3400 Win=64240 Len=1 2976 326.154350 x.x.x.99 x.x.x.10 TCP [TCP Keep-Alive ACK] 14492 2226 [ACK] Seq=3400 Ack=1033 Win=64503 [TCP CHECKSUM INCORRECT] Len=0

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• How do I keep a table up to date across 4 db's to be used in SQL Replication Filtering?

  - by Refracted Paladin

  I have a Win Form, Data Entry, application that uses 4 seperate Data Bases. This is an occasionally connected app that uses Merge Replication (SQL 2005) to stay in Sync. This is working just fine. The next hurdle I am trying to tackle is adding Filters to my Publications. Right now we are replicating 70mbs, compressed, to each of our 150 subscribers when, truthfully, they only need a tiny fraction of that. Using Filters I am able to accomplish this(see code below) but I had to make a mapping table in order to do so. This mapping table consists of 3 columns. A PrimaryID(Guid), WorkerName(varchar), and ClientID(int). The problem is I need this table present in all FOUR Databases in order to use it for the filter since, to my knowledge, views or cross-db query's are not allowed in a Filter Statement. What are my options? Seems like I would set it up to be maintained in 1 Database and then use Triggers to keep it updated in the other 3 Databases. In order to be a part of the Filter I have to include that table in the Replication Set so how do I flag it appropriately. Is there a better way, altogether? SELECT <published_columns> FROM [dbo].[tblPlan] WHERE [ClientID] IN (select ClientID from [dbo].[tblWorkerOwnership] where WorkerID = SUSER_SNAME()) Which allows you to chain together Filters, this next one is below the first one so it only pulls from the first's Filtered Set. SELECT <published_columns> FROM [dbo].[tblPlan] INNER JOIN [dbo].[tblHealthAssessmentReview] ON [tblPlan].[PlanID] = [tblHealthAssessmentReview].[PlanID] P.S. - I know how illogical the DB structure sounds. I didn't make it. I inherited it and was then told to make it a "disconnected app."

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• What is causing the unusual high load average?

  - by James

  I noticed on Tuesday night of last week, the load average went up sharply and it seemed abnormal since the traffic is small. Usually, the numbers usually average around .40 or lower and my server stuff (mysql, php and apache) are optimized. I noticed that the IOWait is unusually high even though the processes is barely using any CPU. top - 01:44:39 up 1 day, 21:13, 1 user, load average: 1.41, 1.09, 0.86 Tasks: 60 total, 1 running, 59 sleeping, 0 stopped, 0 zombie Cpu0 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu1 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu2 : 0.0%us, 0.3%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu3 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu4 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu5 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu6 : 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Cpu7 : 0.0%us, 0.0%sy, 0.0%ni, 91.5%id, 8.5%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1048576k total, 331944k used, 716632k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2468 1376 1140 S 0 0.1 0:00.92 init 1656 root 15 0 13652 5212 664 S 0 0.5 0:00.00 apache2 9323 root 18 0 13652 5212 664 S 0 0.5 0:00.00 apache2 10079 root 18 0 3972 1248 972 S 0 0.1 0:00.00 su 10080 root 15 0 4612 1956 1448 S 0 0.2 0:00.01 bash 11298 root 15 0 13652 5212 664 S 0 0.5 0:00.00 apache2 11778 chikorit 15 0 2344 1092 884 S 0 0.1 0:00.05 top 15384 root 18 0 17544 13m 1568 S 0 1.3 0:02.28 miniserv.pl 15585 root 15 0 8280 2736 2168 S 0 0.3 0:00.02 sshd 15608 chikorit 15 0 8280 1436 860 S 0 0.1 0:00.02 sshd Here is the VMStat procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 1 0 0 768644 0 0 0 0 14 23 0 10 1 0 99 0 IOStat - Nothing unusal Total DISK READ: 67.13 K/s | Total DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO COMMAND 19496 be/4 chikorit 11.85 K/s 0.00 B/s 0.00 % 0.00 % apache2 -k start 19501 be/4 mysql 3.95 K/s 0.00 B/s 0.00 % 0.00 % mysqld 19568 be/4 chikorit 11.85 K/s 0.00 B/s 0.00 % 0.00 % apache2 -k start 19569 be/4 chikorit 11.85 K/s 0.00 B/s 0.00 % 0.00 % apache2 -k start 19570 be/4 chikorit 11.85 K/s 0.00 B/s 0.00 % 0.00 % apache2 -k start 19571 be/4 chikorit 7.90 K/s 0.00 B/s 0.00 % 0.00 % apache2 -k start 19573 be/4 chikorit 7.90 K/s 0.00 B/s 0.00 % 0.00 % apache2 -k start 1 be/4 root 0.00 B/s 0.00 B/s 0.00 % 0.00 % init 11778 be/4 chikorit 0.00 B/s 0.00 B/s 0.00 % 0.00 % top 19470 be/4 mysql 0.00 B/s 0.00 B/s 0.00 % 0.00 % mysqld Load Average Chart - http://i.stack.imgur.com/kYsD0.png I want to be sure if this is not a MySQL problem before making sure. Also, this is a Ubuntu 10.04 LTS Server on OpenVZ. Edit: This will probably give a good picture on the IO Wait top - 22:12:22 up 17:41, 1 user, load average: 1.10, 1.09, 0.93 Tasks: 33 total, 1 running, 32 sleeping, 0 stopped, 0 zombie Cpu(s): 0.6%us, 0.2%sy, 0.0%ni, 89.0%id, 10.1%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1048576k total, 260708k used, 787868k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 15 0 2468 1376 1140 S 0 0.1 0:00.88 init 5849 root 15 0 12336 4028 668 S 0 0.4 0:00.00 apache2 8063 root 15 0 12336 4028 668 S 0 0.4 0:00.00 apache2 9732 root 16 0 8280 2728 2168 S 0 0.3 0:00.02 sshd 9746 chikorit 18 0 8412 1444 864 S 0 0.1 0:01.10 sshd 9747 chikorit 18 0 4576 1960 1488 S 0 0.2 0:00.24 bash 13706 chikorit 15 0 2344 1088 884 R 0 0.1 0:00.03 top 15745 chikorit 15 0 12968 5108 1280 S 0 0.5 0:00.00 apache2 15751 chikorit 15 0 72184 25m 18m S 0 2.5 0:00.37 php5-fpm 15790 chikorit 18 0 12472 4640 1192 S 0 0.4 0:00.00 apache2 15797 chikorit 15 0 72888 23m 16m S 0 2.3 0:00.06 php5-fpm 16038 root 15 0 67772 2848 592 D 0 0.3 0:00.00 php5-fpm 16309 syslog 18 0 24084 1316 992 S 0 0.1 0:00.07 rsyslogd 16316 root 15 0 5472 908 500 S 0 0.1 0:00.00 sshd 16326 root 15 0 2304 908 712 S 0 0.1 0:00.02 cron 17464 root 15 0 10252 7560 856 D 0 0.7 0:01.88 psad 17466 root 18 0 1684 276 208 S 0 0.0 0:00.31 psadwatchd 17559 root 18 0 11444 2020 732 S 0 0.2 0:00.47 sendmail-mta 17688 root 15 0 10252 5388 1136 S 0 0.5 0:03.81 python 17752 teamspea 19 0 44648 7308 4676 S 0 0.7 1:09.70 ts3server_linux 18098 root 15 0 12336 6380 3032 S 0 0.6 0:00.47 apache2 18099 chikorit 18 0 10368 2536 464 S 0 0.2 0:00.00 apache2 18120 ntp 15 0 4336 1316 984 S 0 0.1 0:00.87 ntpd 18379 root 15 0 12336 4028 668 S 0 0.4 0:00.00 apache2 18387 mysql 15 0 62796 36m 5864 S 0 3.6 1:43.26 mysqld 19584 root 15 0 12336 4028 668 S 0 0.4 0:00.02 apache2 22498 root 16 0 12336 4028 668 S 0 0.4 0:00.00 apache2 24260 root 15 0 67772 3612 1356 S 0 0.3 0:00.22 php5-fpm 27712 root 15 0 12336 4028 668 S 0 0.4 0:00.00 apache2 27730 root 15 0 12336 4028 668 S 0 0.4 0:00.00 apache2 30343 root 15 0 12336 4028 668 S 0 0.4 0:00.00 apache2 30366 root 15 0 12336 4028 668 S 0 0.4 0:00.00 apache2 This is the free ram as of today. total used free shared buffers cached Mem: 1024 302 721 0 0 0 -/+ buffers/cache: 302 721 Swap: 0 0 0 Update: Looking into the logs, particularly the PHP5-FPM, which is causing the CPU spike. I found that its segment faulting for some apparent reason. [03-Jun-2012 06:11:20] NOTICE: [pool www] child 14132 started [03-Jun-2012 06:11:25] WARNING: [pool www] child 13664 exited on signal 11 (SIGSEGV) after 53.686322 seconds from start [03-Jun-2012 06:11:25] NOTICE: [pool www] child 14328 started [03-Jun-2012 06:11:25] WARNING: [pool www] child 14132 exited on signal 11 (SIGSEGV) after 4.708681 seconds from start [03-Jun-2012 06:11:25] NOTICE: [pool www] child 14329 started [03-Jun-2012 06:11:58] WARNING: [pool www] child 14328 exited on signal 11 (SIGSEGV) after 32.981228 seconds from start [03-Jun-2012 06:11:58] NOTICE: [pool www] child 15745 started [03-Jun-2012 06:12:25] WARNING: [pool www] child 15745 exited on signal 11 (SIGSEGV) after 27.442864 seconds from start [03-Jun-2012 06:12:25] NOTICE: [pool www] child 17446 started [03-Jun-2012 06:12:25] WARNING: [pool www] child 14329 exited on signal 11 (SIGSEGV) after 60.411278 seconds from start [03-Jun-2012 06:12:25] NOTICE: [pool www] child 17447 started [03-Jun-2012 06:13:02] WARNING: [pool www] child 17446 exited on signal 11 (SIGSEGV) after 36.746793 seconds from start [03-Jun-2012 06:13:02] NOTICE: [pool www] child 18133 started [03-Jun-2012 06:13:48] WARNING: [pool www] child 17447 exited on signal 11 (SIGSEGV) after 82.710107 seconds from start I'm thinking that this might be causing the problem. If that is the cause, probably switching it off that to fastcgi/fcgid might resolve it... but still, I want to see if something else might be causing it to do this.

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• Is it possible to setup an internal test email server to keep all mail sent to it?

  - by MattGrommes

  We have a need at my work to setup a test email server that will take all mail sent to it for delivery and instead just dump it into an account for later retrieval. I've been out of the email server configuration game long enough that I think that's possible but I don't know for sure. As a more specific example of what we need: We have code that sends emails to outside clients in certain cases. We want to point our code to a test server that will accept those emails, but not let them get to the outside world (yes, it's happened before, oops). We then need to be able to verify that Email X would have gotten sent to Client Y if we had sent to the real server. As a bonus, we have a error email alias on our real server that goes to the programmers that we would like to keep getting email from. So anything sent to that alias on the test server would forward to our real server for delivery. My preference is for postfix but our IT staff seems set on using sendmail (or Exchange) for everything so hints/pointers for either server would be helpful. Thanks a lot.

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• Tutorial: Getting Started with the NoSQL JavaScript / Node.js API for MySQL Cluster

  - by Mat Keep

  Tutorial authored by Craig Russell and JD Duncan  The MySQL Cluster team are working on a new NoSQL JavaScript connector for MySQL. The objectives are simplicity and high performance for JavaScript users: - allows end-to-end JavaScript development, from the browser to the server and now to the world's most popular open source database - native "NoSQL" access to the storage layer without going first through SQL transformations and parsing. Node.js is a complete web platform built around JavaScript designed to deliver millions of client connections on commodity hardware. With the MySQL NoSQL Connector for JavaScript, Node.js users can easily add data access and persistence to their web, cloud, social and mobile applications. While the initial implementation is designed to plug and play with Node.js, the actual implementation doesn't depend heavily on Node, potentially enabling wider platform support in the future. Implementation The architecture and user interface of this connector are very different from other MySQL connectors in a major way: it is an asynchronous interface that follows the event model built into Node.js. To make it as easy as possible, we decided to use a domain object model to store the data. This allows for users to query data from the database and have a fully-instantiated object to work with, instead of having to deal with rows and columns of the database. The domain object model can have any user behavior that is desired, with the NoSQL connector providing the data from the database. To make it as fast as possible, we use a direct connection from the user's address space to the database. This approach means that no SQL (pun intended) is needed to get to the data, and no SQL server is between the user and the data. The connector is being developed to be extensible to multiple underlying database technologies, including direct, native access to both the MySQL Cluster "ndb" and InnoDB storage engines. The connector integrates the MySQL Cluster native API library directly within the Node.js platform itself, enabling developers to seamlessly couple their high performance, distributed applications with a high performance, distributed, persistence layer delivering 99.999% availability. The following sections take you through how to connect to MySQL, query the data and how to get started. Connecting to the database A Session is the main user access path to the database. You can get a Session object directly from the connector using the openSession function: var nosql = require("mysql-js"); var dbProperties = {     "implementation" : "ndb",     "database" : "test" }; nosql.openSession(dbProperties, null, onSession); The openSession function calls back into the application upon creating a Session. The Session is then used to create, delete, update, and read objects. Reading data The Session can read data from the database in a number of ways. If you simply want the data from the database, you provide a table name and the key of the row that you want. For example, consider this schema: create table employee (   id int not null primary key,   name varchar(32),   salary float ) ENGINE=ndbcluster; Since the primary key is a number, you can provide the key as a number to the find function. function onSession = function(err, session) {   if (err) {     console.log(err);     ... error handling   }   session.find('employee', 0, onData); }; function onData = function(err, data) {   if (err) {     console.log(err);     ... error handling   }   console.log('Found: ', JSON.stringify(data));   ... use data in application }; If you want to have the data stored in your own domain model, you tell the connector which table your domain model uses, by specifying an annotation, and pass your domain model to the find function. var annotations = new nosql.Annotations(); function Employee = function(id, name, salary) {   this.id = id;   this.name = name;   this.salary = salary;   this.giveRaise = function(percent) {     this.salary *= percent;   } }; annotations.mapClass(Employee, {'table' : 'employee'}); function onSession = function(err, session) {   if (err) {     console.log(err);     ... error handling   }   session.find(Employee, 0, onData); }; Updating data You can update the emp instance in memory, but to make the raise persistent, you need to write it back to the database, using the update function. function onData = function(err, emp) {   if (err) {     console.log(err);     ... error handling   }   console.log('Found: ', JSON.stringify(emp));   emp.giveRaise(0.12); // gee, thanks!   session.update(emp); // oops, session is out of scope here }; Using JavaScript can be tricky because it does not have the concept of block scope for variables. You can create a closure to handle these variables, or use a feature of the connector to remember your variables. The connector api takes a fixed number of parameters and returns a fixed number of result parameters to the callback function. But the connector will keep track of variables for you and return them to the callback. So in the above example, change the onSession function to remember the session variable, and you can refer to it in the onData function: function onSession = function(err, session) {   if (err) {     console.log(err);     ... error handling   }   session.find(Employee, 0, onData, session); }; function onData = function(err, emp, session) {   if (err) {     console.log(err);     ... error handling   }   console.log('Found: ', JSON.stringify(emp));   emp.giveRaise(0.12); // gee, thanks!   session.update(emp, onUpdate); // session is now in scope }; function onUpdate = function(err, emp) {   if (err) {     console.log(err);     ... error handling   } Inserting data Inserting data requires a mapped JavaScript user function (constructor) and a session. Create a variable and persist it: function onSession = function(err, session) {   var data = new Employee(999, 'Mat Keep', 20000000);   session.persist(data, onInsert);   } }; Deleting data To remove data from the database, use the session remove function. You use an instance of the domain object to identify the row you want to remove. Only the key field is relevant. function onSession = function(err, session) {   var key = new Employee(999);   session.remove(Employee, onDelete);   } }; More extensive queries We are working on the implementation of more extensive queries along the lines of the criteria query api. Stay tuned. How to evaluate The MySQL Connector for JavaScript is available for download from labs.mysql.com. Select the build: MySQL-Cluster-NoSQL-Connector-for-Node-js You can also clone the project on GitHub Since it is still early in development, feedback is especially valuable (so don't hesitate to leave comments on this blog, or head to the MySQL Cluster forum). Try it out and see how easy (and fast) it is to integrate MySQL Cluster into your Node.js platforms. You can learn more about other previewed functionality of MySQL Cluster 7.3 here

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• php file downloads instead of being processed with ajax on apache

  - by eagleon

  I have a small website where some content is displayed within a HTML tag using AJAX. The content is simply taken from another page on the same web site. However, sometimes instead of loading the parsed PHP file, the browser displays a download box instead. I downloaded the file and this is what it looks like a text file mixed with binary or gzipped data. I can't paste the binary stuff here, but here are some of the headers: Jul 2012 18:52:16 GMT Server: Apache/2 X-Powered-By: PHP/5.3.10 Content-Encoding: gzip Vary: Accept-Encoding,User-Agent Keep-Alive: timeout=1, max=95 Connection: Keep-Alive Transfer-Encoding: chunked Content-Type: text/html HTTP/1.1 304 Not Modified Date: Sun, 01 Jul 2012 18:52:16 GMT Server: Apache/2 Connection: Keep-Alive Keep-Alive: timeout=1, max=93 ETag: "2fc857-409-4c39691c59b40" HTTP/1.1 304 Not Modified Date: Sun, 01 Jul 2012 18:52:16 GMT Server: Apache/2 Connection: Keep-Alive Keep-Alive: timeout=1, max=92 ETag: "2fc854-3e5-4c39691b65900" HTTP/1.1 304 Not Modified Date: Sun, 01 Jul 2012 18:52:16 GMT Server: Apache/2 Connection: Keep-Alive Keep-Alive: timeout=1, max=91 ETag: "2fc847-3e3-4c3969197d480" and large blocks of stuff like this: µàl]&BaËÜk#ìÏ

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• How do I keep a table in sync across multiple SQL Databases?

  - by Refracted Paladin

  I have a Win Form, Data Entry, application that uses 4 seperate Data Bases. This is an occasionally connected app that uses Merge Replication (SQL 2005) to stay in Sync. This is working just fine. The next hurdle I am trying to tackle is adding Filters to my Publications. Right now we are replicating 70mbs, compressed, to each of our 150 subscribers when, truthfully, they only need a tiny fraction of that. Using Filters I am able to accomplish this(see code below) but I had to make a mapping table in order to do so. This mapping table consists of 3 columns. A PrimaryID(Guid), WorkerName(varchar), and ClientID(int). The problem is I need this table present in all FOUR Databases in order to use it for the filter since, to my knowledge, views or cross-db query's are not allowed in a Filter Statement. What are my options? Seems like I would set it up to be maintained in 1 Database and then use Triggers to keep it updated in the other 3 Databases. In order to be a part of the Filter I have to include that table in the Replication Set so how do I flag it appropriately. Is there a better way, altogether? SELECT <published_columns> FROM [dbo].[tblPlan] WHERE [ClientID] IN (select ClientID from [dbo].[tblWorkerOwnership] where WorkerID = SUSER_SNAME()) Which allows you to chain together Filters, this next one is below the first one so it only pulls from the first's Filtered Set. SELECT <published_columns> FROM [dbo].[tblPlan] INNER JOIN [dbo].[tblHealthAssessmentReview] ON [tblPlan].[PlanID] = [tblHealthAssessmentReview].[PlanID] P.S. - I know how illogical the DB structure sounds. I didn't make it. I inherited it and was then told to make it a "disconnected app." Go figure!

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• How do I keep the keyword.url setting in firefox to default when you restart the browser without del

  - by user34801

  I am on the latest version of Firefox (not beta or anything like that) and currently my keyword.url is stuck on search.google.com (which I don't remember setting even though the about:config says it's a user setting. Can someone tell me how to set it back to default and keep it at default when I reset my browser? I do not want to delete prefs.js as I do not want to go thru setting up all the extension settings I have just to have my location bar search google (if this is the only way then I'll stick with searching from the search bar instead). I've checked all my extensions that may effect the location bar but could not find anything that says it would change the default search engine for this. I've also tried to open the prefs.js in wordpad or notepad but it just ends up freezing when trying to edit it at all (yes the browser is closed at the time). I also deleted the prefs-1.js (along with 2 others) that were older (after trying to rename those to prefs.js and see if this corrects it. It might have but had such old extension settings I went back to my latest prefs.js with this one issue instead of the issue of setting back up a ton of extensions. I can give any other info if needed, someone please help me fix this issue if possible.

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• How do I keep a table in Sync across 4 db's to be used in SQL Replication Filtering?

  - by Refracted Paladin

  I have a Win Form, Data Entry, application that uses 4 seperate Data Bases. This is an occasionally connected app that uses Merge Replication (SQL 2005) to stay in Sync. This is working just fine. The next hurdle I am trying to tackle is adding Filters to my Publications. Right now we are replicating 70mbs, compressed, to each of our 150 subscribers when, truthfully, they only need a tiny fraction of that. Using Filters I am able to accomplish this(see code below) but I had to make a mapping table in order to do so. This mapping table consists of 3 columns. A PrimaryID(Guid), WorkerName(varchar), and ClientID(int). The problem is I need this table present in all FOUR Databases in order to use it for the filter since, to my knowledge, views or cross-db query's are not allowed in a Filter Statement. What are my options? Seems like I would set it up to be maintained in 1 Database and then use Triggers to keep it updated in the other 3 Databases. In order to be a part of the Filter I have to include that table in the Replication Set so how do I flag it appropriately. Is there a better way, altogether? SELECT <published_columns> FROM [dbo].[tblPlan] WHERE [ClientID] IN (select ClientID from [dbo].[tblWorkerOwnership] where WorkerID = SUSER_SNAME()) Which allows you to chain together Filters, this next one is below the first one so it only pulls from the first's Filtered Set. SELECT <published_columns> FROM [dbo].[tblPlan] INNER JOIN [dbo].[tblHealthAssessmentReview] ON [tblPlan].[PlanID] = [tblHealthAssessmentReview].[PlanID] P.S. - I know how illogical the DB structure sounds. I didn't make it. I inherited it and was then told to make it a "disconnected app."

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• Migrating from one linux install to another: How to keep the second disk around?

  - by Jim Miller

  I've got a linux box running Fedora 19 that I want to move to CentOS 6.4. Rather than trying to do something fancy with the current disk (which has also accumulated a lot of sludge over the years), I'm going to get a new disk, put CentOS on that, and then move the to-be-preserved bits of stuff from the old disk to the new one. I haven't done this yet, but I presume it should be semi-straightforward -- do the CentOS install on the new disk, mount the old disk on /olddisk or somesuch, and start copying. However, I'm not sure how to handle getting the machine to recognize the new empty disk as the target of the CentOS install (I suppose I can just pull the old disk during the installation), remember that this is the intended boot disk once the install has happened), and tweak /etc/fstab (right?) to set up the old disk on the desired mount point. (Both disks are, or will be, SATA.) I could probably hack it together without losing too much hair or doing too much damage, but could anyone offer some advice that would get/keep me on the right track? Thanks!

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• How to keep multiple servers in sync file wise?

  - by GForceSys

  I'm currently managing a cluster of PHP-FPM servers, all of which tend to get out of sync with each other. The application that I'm using on top of the app servers (Magento) allows for admins to modify various files on the system, but now that the site is in a clustered set up modifying a file only modifies it on a single instance (on one of the app servers) of the various machines in the cluster. Is there an open-source application for Linux that may allow me to keep all of these servers in sync? I have no problem with creating a small VM instance that can listen for changes from machines to sync. In theory, the perfect application would have small clients that run on each machine to be synced, which would talk to the master server which would then decide how/what to sync from each machine. I have already examined the possibilities of running a centralized file server, but unfortunately my app servers are spread out between EC2 and physical machines, which makes this unfeasible. As there are multiple app servers (some of which are dynamically created depending on the load of the site), simply setting up a rsync cron job is not efficient as the cron job would have to be modified on each machine to send files to every other machine in the cluster, and that would just be a whole bunch of unnecessary data transfers/ssh connections.

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• What Good way to keep some different data in Cookies in asp.net?

  - by Dmitriy

  Hello! I want to keep some different data in one cookie file and write this class, and want to know - is this good? For example - user JS enable.When user open his first page on my site, i write to session his GMT time and write with this manager JS state. (GMT time is ajax request with js). And i want to keep some data in this cookie (up to 10 values). Have any advices or tips? /// <summary> /// CookiesSettings /// </summary> internal enum CookieSetting { IsJsEnable = 1, } internal class CookieSettingValue { public CookieSetting Type { get; set; } public string Value { get; set; } } /// <summary> /// Cookies to long time of expire /// </summary> internal class CookieManager { //User Public Settings private const string CookieValueName = "UPSettings"; private string[] DelimeterValue = new string[1] { "#" }; //cookie daat private List<CookieSettingValue> _data; public CookieManager() { _data = LoadFromCookies(); } #region Save and load /// <summary> /// Load from cookie string value /// </summary> private List<CookieSettingValue> LoadFromCookies() { if (!CookieHelper.RequestCookies.Contains(CookieValueName)) return new List<CookieSettingValue>(); _data = new List<CookieSettingValue>(); string data = CookieHelper.RequestCookies[CookieValueName].ToString(); string[] dels = data.Split(DelimeterValue, StringSplitOptions.RemoveEmptyEntries); foreach (string delValue in dels) { int eqIndex = delValue.IndexOf("="); if (eqIndex == -1) continue; int cookieType = ValidationHelper.GetInteger(delValue.Substring(0, eqIndex), 0); if (!Enum.IsDefined(typeof(CookieSetting), cookieType)) continue; CookieSettingValue value = new CookieSettingValue(); value.Type = (CookieSetting)cookieType; value.Value = delValue.Substring(eqIndex + 1, delValue.Length - eqIndex-1); _data.Add(value); } return _data; } public void Save() { CookieHelper.SetValue(CookieValueName, ToCookie(), DateTime.UtcNow.AddMonths(6)); } #endregion #region Get value public bool Bool(CookieSetting type, bool defaultValue) { CookieSettingValue inList = _data.SingleOrDefault(x => x.Type == type); if (inList == null) return defaultValue; return ValidationHelper.GetBoolean(inList.Value, defaultValue); } #endregion #region Set value public void SetValue(CookieSetting type, int value) { CookieSettingValue inList = _data.SingleOrDefault(x => x.Type == type); if (inList == null) { inList = new CookieSettingValue(); inList.Type = type; inList.Value = value.ToString(); _data.Add(inList); } else { inList.Value = value.ToString(); } } public void SetValue(CookieSetting type, bool value) { CookieSettingValue inList = _data.SingleOrDefault(x => x.Type == type); if (inList == null) { inList = new CookieSettingValue(); inList.Type = type; inList.Value = value.ToString(); _data.Add(inList); } else { inList.Value = value.ToString(); } } #endregion #region Private methods private string ToCookie() { StringBuilder sb = new StringBuilder(); for (int i = 0; i < _data.Count; i++) { sb.Append((int)_data[i].Type); sb.Append("="); sb.Append(_data[i].Value); sb.Append(DelimeterValue[0]); } return sb.ToString(); } /// <summary> /// Cookie length in bytes. Max - 4 bytes /// </summary> /// <returns></returns> private int GetLength() { return System.Text.Encoding.UTF8.GetByteCount(ToCookie()); } #endregion } P.S. i want to keep many data in one cookies file to compress data and decrease cookies count.

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• Can you use gzip over SSL? And Connection: Keep-Alive headers

  - by magenta

  I'm evaluating the front end performance of a secure (SSL) web app here at work and I'm wondering if it's possible to compress text files (html/css/javascript) over SSL. I've done some googling around but haven't found anything specifically related to SSL. If it's possible, is it even worth the extra CPU cycles since responses are also being encrypted? Would compressing responses hurt performance? Also, I'm wanting to make sure we're keeping the SSL connection alive so we're not making SSL handshakes over and over. I'm not seeing Connection: Keep-Alive in the response headers. I do see Keep-Alive: 115 in the request headers but that's only keeping the connection alive for 115 milliseconds (seems like the app server is closing the connection after a single request is processed?) Wouldn't you want the server to be setting that response header for as long as the session inactivity timeout is? I understand browsers don't cache SSL content to disk so we're serving the same files over and over and over on subsequent visits even though nothing has changed. The main optimization recommendations are reducing the number of http requests, minification, moving scripts to bottom, image optimization, possible domain sharding (though need to weigh the cost of another SSL handshake), things of that nature.

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• How to avoid user keep trying login using Ruby on Rails?

  - by Tattat

  I want to create a login page, it can easy implement using Ruby on Rails. But the login is very simple, but I want more security. I want to stop the user keep trying the password. So, I have some ideas on that. First, stop login feature if the user keep trying the password for 15 mins. After the user login fail 5 times in 15 mins, the system should not allow the user login again in next 15 mins, ever his/her password is correct. Second, I want to add a human verification, after the user tried 5 times. After the user wait for 15 mins to login, I want to add an addition verification to the user. I want the user click the password, and the CAPTCHA image. If one of them is failed, they still can't login the system. He/She have 5 times to try, if he / she failed again, he/she need to want another 15 mins. Third, After the user tried 15 times, and still can't get into the system. I want to lock the user account, the user will receive an email, with a link to assign the password again. So, the question is "Is there any library to implement such authorization easily?" I know it can be implemented using code, but using library is much convenient. Also, I want to ask is there any security suggestion for that? thank u.

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• What is the best Design/Way to keep user connected ?

  - by Fasih Hansmukh

  Am working on a POC for self learning in which I want to keep my user connected in LIVE pattern. For example, A game in which 4 user can play at a time , here I need to keep this user connected to my game . M not good at Socket type of programming and love to do that in Services way.What i wana know is 'What is the best way of doing this'. According to my initial Brain Storming, I have decided that I will use SilverLight(In Browser Or Out of Browser) as Front end [I have no issue in that]. I m more concern in back end. Either I make an handler or make a WCF service or use full duplex service and use pooling mechanism for that. As a random thought I come up with a Timer type logic that will fire every after 10 seconds at clients end and get status like Is it now Its turn to roll a dice Home many user left (in case if some of them left) What are connected user status in game like there score/points ect and update game view according to this at his end Kindly place your best answers here that will help me to learn this. Regards and thanks in Advance EDIT: Starting Bounty as i need more feedback. FH

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• How to keep the CPU usage down while running an SDL program?

  - by budwiser

  I've done a very basic window with SDL and want to keep it running until I press the X on window. #include "SDL.h" const int SCREEN_WIDTH = 640; const int SCREEN_HEIGHT = 480; int main(int argc, char **argv) { SDL_Init( SDL_INIT_VIDEO ); SDL_Surface* screen = SDL_SetVideoMode( SCREEN_WIDTH, SCREEN_HEIGHT, 0, SDL_HWSURFACE | SDL_DOUBLEBUF ); SDL_WM_SetCaption( "SDL Test", 0 ); SDL_Event event; bool quit = false; while (quit != false) { if (SDL_PollEvent(&event)) { if (event.type == SDL_QUIT) { quit = true; } } SDL_Delay(80); } SDL_Quit(); return 0; } I tried adding SDL_Delay() at the end of the while-clause and it worked quite well. However, 80 ms seemed to be the highest value I could use to keep the program running smoothly and even then the CPU usage is about 15-20%. Is this the best way to do this and do I have to just live with the fact that it eats this much CPU already on this point?

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• Is there a better way to keep track of session variable creation/access throughout different pages?

  - by Brandon

  Here's what I am working on. At my website I have multiple processes with each one containing multiple steps. Now in one of the processes, there is an error checking routine executed before proceeding to the next step of that process. A session var is set indicating the error status and it will either redirect back to the referrer or display the next page's contents. Now this kind of functionality, I believe, is common throughout web development. The issue that is occurring is that session vars are left around and are not being cleaned up properly. At times this introduces undesired behavior. My website is growing and I find that I am requiring more and more session vars to keep track of different system and error states. So I was thinking about creating a kind of "session variable keeper" to keep track of session var usage. The idea is fairly simple. It will have the notion of a context (e.g. registration process) and allow access to a predefined set of session vars within that context. In addition, the var and context will be paired with an action to proceed to some form of event handling. So if you haven't noticed I'm new to web development. Any thoughts or comments on the idea that I am proposing would be greatly appreciated. The back-end is written in PHP/MySQL.

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• Where to create/keep secret files for license information/trials on Windows/Mac OS X/Linux?

  - by BastiBense

  I'm writing a commercial product which uses a simple registration mechanism and allows the user to use the application for a demo period before purchasing. My application must somewhere store the registration information (if entered) and/or the date of the first launch to calculate if the user is still within the demo/trail period. While I'm pretty much finished with the registration mechanism itself, I now have to find a good way to store the registration information on the user's disk. The most obvious idea would be to store the trial period in the preferences file, but since user tend to delete/tinker with those from time to time, it might be a good idea to keep the registration information in a separate, more hidden file. So here's my question: What is the best place/strategy to keep and create such hidden files on Windows, Mac OS X and Linux? Here is what came to my mind so far: Linux/Mac OS X Most Unix-like systems are rather locked down when it comes to places a user can write files to. In most cases this is only the /tmp directory and the user's home directory. I guess the easiest here is probably to create a file with a dot-prefix to make it less visible, then give it a name that won't make it obvious that it's associated with my application. Windows Probably much like Linux/Mac OS X - more recent Windows versions become more restrictive when it comes to file system permissions. Anyway, I'd like to hear your ideas and thoughs. Even better if you have already implemented something similar in the past. Thanks! Update For me the places for such files is more relevant than the discussion of the question if this way for copy protection is good or bad.

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