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  • load balance timeout SQL connection string

    - by george9170
    It seems that if there is a sql memory leak somewhere and you dont have time to find it you can use the load balance timeout option in a sql connection string to destory the connection after x seconds. Am i right in assuming I can set the load balance time out to 30-40 seconds and then hunt for the leak latter, while in the mean time the leak will not affect my application too much.

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  • Simple aggregating query very slow in PostgreSql, any way to improve?

    - by Ash
    HI I have a table which holds files and their types such as CREATE TABLE files ( id SERIAL PRIMARY KEY, name VARCHAR(255), filetype VARCHAR(255), ... ); and another table for holding file properties such as CREATE TABLE properties ( id SERIAL PRIMARY KEY, file_id INTEGER CONSTRAINT fk_files REFERENCES files(id), size INTEGER, ... // other property fields ); The file_id field has an index. The file table has around 800k lines, and the properties table around 200k (not all files necessarily have/need a properties). I want to do aggregating queries, for example find the average size and standard deviation for all file types. But it's very slow - around 70 seconds for the latter query. I understand it needs a sequential scan, but still it seems too much. Here's the query SELECT f.filetype, avg(size), stddev(size) FROM files as f, properties as pr WHERE f.id = pr.file_id GROUP BY f.filetype; and the explain HashAggregate (cost=140292.20..140293.94 rows=116 width=13) (actual time=74013.621..74013.954 rows=110 loops=1) -> Hash Join (cost=6780.19..138945.47 rows=179564 width=13) (actual time=1520.104..73156.531 rows=179499 loops=1) Hash Cond: (f.id = pr.file_id) -> Seq Scan on files f (cost=0.00..108365.41 rows=1140941 width=9) (actual time=0.998..62569.628 rows=805270 loops=1) -> Hash (cost=3658.64..3658.64 rows=179564 width=12) (actual time=1131.053..1131.053 rows=179499 loops=1) -> Seq Scan on properties pr (cost=0.00..3658.64 rows=179564 width=12) (actual time=0.753..557.171 rows=179574 loops=1) Total runtime: 74014.520 ms Any ideas why it is so slow/how to make it faster?

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  • How to change file contents in PHP ?

    - by Misha Moroshko
    I save in a file some info about users (like number of times user passed the login page, last visited time, and so on). I want to read this info from the file, and update it (add 1 to the counter, and change the last visited time). My question is: can I do it without opening the file twice ? I open the first time to read the contents, and then open it again to overwrite the contents with the updated ones. Thanks !

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  • Understanding omission failure in distributed systems

    - by karthik A
    The following text says this which I'm not able to quite agree : client C sends a request R to server S. The time taken by a communication link to transport R over the link is D. P is the maximum time needed by S to recieve , process and reply to R. If omission failure is assumed ; then if no reply to R is received within 2(D+P) , then C will never recieve a reply to R . Why is the time here 2(D+P). As I understand shouldn't it be 2D+P ?

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  • Setting timeout for embedded Lua

    - by skyeagle
    I have embedded Lua in a C/C+= application. I want to be able to set a timeout value to prevent getting trapped with badly written scripts that can result in infinite loops (or even string searches that take an infinite time to complete). Basically, I want to be able to set a time interval and if the script fails to complete running at the end of that time interval, I want to be able to kill the Lua script engine (gracefully, if possible). Anyone knows of best practise way to do this?

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  • Making alarm clock with NSTimer

    - by Alex G
    I just went through trying to make an alarm clock app with local notifications but that didn't do the trick because I needed an alert to appear instead of it going into notification centre in iOS 5+ So far I've been struggling greatly with nstimer and its functions so I was wondering if anyone could help out. I want when the user selects a time (through UIDatePicker, only time) for an alert to be displayed at exactly this time. I have figured out how to get the time from UIDatePicker but I do not know how to properly set the firing function of nstimer. This is what I have attempted so far, if anyone could help... be much appreciated. Thank you Example (it keeps going into the function every second opposed to a certain time I told it too... not what I want): NSDate *timestamp; NSDateComponents *comps = [[[NSDateComponents alloc] init] autorelease]; [comps setHour:2]; [comps setMinute:8]; timestamp = [[NSCalendar currentCalendar] dateFromComponents:comps]; NSTimer *f = [[NSTimer alloc] initWithFireDate:timestamp interval:0 target:self selector:@selector(test) userInfo:nil repeats:YES]; NSRunLoop *runner = [NSRunLoop currentRunLoop]; [runner addTimer:f forMode: NSDefaultRunLoopMode];

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  • Why can't I rename a data frame column inside a list?

    - by Moreno Garcia
    I would like to rename some columns from CPU_Usage to the process name before I merge the dataframes in order to make it more legible. names(byProcess[[1]]) # [1] "Time" "CPU_Usage" names(byProcess[1]) # [1] "CcmExec_3344" names(byProcess[[1]][2]) <- names(byProcess[1]) names(byProcess[[1]][2]) # [1] "CPU_Usage" names(byProcess[[1]][2]) <- 'test' names(byProcess[[1]][2]) # [1] "CPU_Usage" lapply(byProcess, names) # $CcmExec_3344 # [1] "Time" "CPU_Usage" # # ... (removed several entries to make it more readable) # # $wrapper_1604 # [1] "Time" "CPU_Usage"

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  • Problem with loop MATLAB

    - by Jessy
    no time scores 1 10 123 2 11 22 3 12 22 4 50 55 5 60 22 6 70 66 . . . . . . n n n Above a the content of my txt file (thousand of lines). 1st column - number of samples 2nd column - time (from beginning to end ->accumulated) 3rd column - scores I wanted to create a new file which will be the total of every three sample of the scores divided by the time difference of the same sample. e.g. (123+22+22)/ (12-10) = 167/2 = 83.5 (55+22+66)/(70-50) = 143/20 = 7.15 new txt file 83.5 7.15 . . . n so far I have this code: fid=fopen('data.txt') data = textscan(fid,'%*d %d %d') time = (data{1}) score= (data{2}) for sample=1:length(score) ..... // I'm stucked here .. end ....

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  • Simple php statement, I can't get it to work!

    - by eberswine
    How to get $schedule = true and $schedule = true to work??? I know this is easy and I'm overlooking something simple! else { if($schedule){ $where[] = 'date > '.(time() + $config_date_adjust * 60 - 432000); } else{ $where[] = 'date < '.(time() + $config_date_adjust * 60); } $schedule = false; } else { if($schedule2){ $where[] = 'date > '.(time() + $config_date_adjust * 60 - 86400); } else{ $where[] = 'date < '.(time() + $config_date_adjust * 60); } $schedule2 = false; }

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  • Makefile rule depending on change of number of files instead of change in content of files.

    - by goathens
    I'm using a makefile to automate some document generation. I have several documents in a directory, and one of my makefile rules will generate an index page of those files. The list of files itself is loaded on the fly using list := $(shell ls documents/*.txt) so I don't have to bother manually editing the makefile every time I add a document. Naturally, I want the index-generation rule to trigger when number/title of files in the documents directory changes, but I don't know how to set up the prerequisites to work in this way. I could use .PHONY or something similar to force the index-generation to run all the time, but I'd rather not waste the cycles. I tried piping ls to a file list.txt and using that as a prerequisite for my index-generation rule, but that would require either editing list.txt manually (trying to avoid it), or auto-generating it in the makefile (this changes the creation time, so I can't use list.txt in the prerequisite because it would trigger the rule every time).

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  • Error 401 when login twitter by twitter4j

    - by user1060362
    I am doing an app android to login and upload photo to twitter. I used twitter4j to login and reference some tutorial..I extract that consumer key and consumer secret key are filled correct.But I encountered an error"401: Authentication credential...".Have a solution to fix it is sync time my server with time twitter server..But I don't understand what sync time here and how to extractly.. Can you help me.

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  • How can i limit parsing and display the previously parsed contents in iphone?

    - by Warrior
    I am new to iphone development.I parsing a url and displayed its content in the table.On clicking a row it plays a video.When i click a done button, i once again call the tableview.When i call the table view it parse the url once again to display the contents .I want to limit the parsing for 1 time and for the next time i want to display the contents which are parsed at the first time.How can i achieve it ?Please help me out.Thanks.

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  • How to profiling my C++ application on linux

    - by richard
    HI, I would like to profile my c++ application on linux. I would like to find out how much time my application spent on CPU processing vs time spent on block by IO/being idle. I know there is a profile tool call valgrind on linux. But it breaks down time spent on each method, and it does not give me an overall picture of how much time spent on CPU processing vs idle? Or is there a way to do that with valgrind. Thank you.

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  • How do I keep connection in object explorer

    - by dotnet-practitioner
    This is regarding SQL server 2008 management studio.. I connect to different environment DB and every time I launch the Sql management console, I have to sign up every time to get those connections back in object explorer. Is there a way I could persist the connection so I don't have to login every time to different environments?

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  • Sleep Function Error In C

    - by Arman
    I have a file of data Dump, in with different timestamped data available, I get the time from timestamp and sleep my c thread for that time. But the problem is that The actual time difference is 10 second and the data which I receive at the receiving end is almost 14, 15 second delay. I am using window OS. Kindly guide me. Sorry for my week English.

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  • http connection timeout issues

    - by Mark
    I'm running into an issue when i try to use the HttpClient connecting to a url. The http connection is taking a longer time to timeout, even after i set a connection timeoout. int timeoutConnection = 5000; HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection); int timeoutSocket = 5000; HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket); It works perfect most of the time. However, every once in while, the http connection runs for ever and ignore the setconnectiontimeout, especailly when the phone is connected to wifi, and the phone was idling. So after the phone is idling, the first time i try to connect, the http connection ignores the setconnectiontimeout and runs forever, after i cancel it and try again, it works like charm everytime. But that one time that doesn't work it creates a threadtimeout error, i tried using a different thread, it works, but i know that the thread is running for long time. I understand that the wifi goes to sleep on idle, but i dont understand why its ignoring the setconnectiontimeout. Anyone can help, id really appreciated.

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  • Always get the correct datetime?

    - by Jesper Mansa
    I was wandering if there is a way/site/link whith the correct time? Not the servers datetime or the clients datetime. I'm using datetime to count down on my gaming site for when it is the users time to make a play. Users come from all ower the world so using the users client time would not match if its from the US to Europe. Then normally I would use the servers time, but somehow it skips 1.2 hours sometimes? I would like to make sure that everbody makes a timestamp from the same source and that source always is correct! Hoping for help and thanks in advance.

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  • Arduino TimeSerial

    - by user541597
    I am working with the TimeSerial sketch (an example in the Arduino Time library). Everything works fine, and I can get it to output the time continuously. I am trying to set a switch which will read in a serial.read(). For example, I send 1 through the serial monitor, my sketch reads the one and runs a function I've created called resetfunc() which all it does is end serial and go back up to setup. It then asks me to enter the T and time stamp but doesn't wait and just keeps printing time. Why is it still doing this? When I haven't sent it the T and timestamp through serial yet?

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  • Do I have to hash twice in C#?

    - by Joe H
    I have code like the following: class MyClass { string Name; int NewInfo; } List<MyClass> newInfo = .... // initialize list with some values Dictionary<string, int> myDict = .... // initialize dictionary with some values foreach(var item in newInfo) { if(myDict.ContainsKey(item.Name)) // 'A' I hash the first time here myDict[item.Name] += item.NewInfo // 'B' I hash the second (and third?) time here else myDict.Add(item.Name, item.NewInfo); } Is there any way to avoid doing two lookups in the Dictionary -- the first time to see if contains an entry, and the second time to update the value? There may even be two hash lookups on line 'B' -- one to get the int value and another to update it.

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  • How can I (reasonably) precisely perform an action every N milliseconds?

    - by Jon Cage
    I have a machine which uses an NTP client to sync up to internet time so it's system clock should be fairly accurate. I've got an application which I'm developing which logs data in real time, processes it and then passes it on. What I'd like to do now is output that data every N milliseconds aligned with the system clock. So for example if I wanted to do 20ms intervals, my oututs ought to be something like this: 13:15:05:0000 13:15:05:0020 13:15:05:0040 13:15:05:0060 I've seen suggestions for using the stopwatch class, but that only measures time spans as opposed to looking for specific time stamps. The code to do this is running in it's own thread, so should be a problem if I need to do some relatively blocking calls. Any suggestions on how to achieve this to a reasonable (close to or better than 1ms precision would be nice) would be very gratefully received.

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  • xdebug profiler output strange results

    - by nic28
    I'm using xdebug to profile some PHP code on Windows and using WinCacheGrind/Webgrind to analyse the output, but I'm getting some strange results. Specifically, the total cumulative time for a single method is greater than 100%! How is it possible that more time is spent executing this function's code and all the functions that it calls than the total time it took to execute the whole script? What am I missing here?

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