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  • Perl daemon script for message queue hanging for 20 seconds after each process. Why?

    - by Mike Diena
    I have daemon script written in Perl that checks a database tables for rows, pulls them in one by one, sends the contents via HTTP post to another service, then logs the result and repeats (only a single child). When there are rows present, the first one is posted and logged immediately, but every subsequent one is delayed for around 20 seconds. There are no sleep()'s running, and I can't find any other obvious delays. Any ideas?

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  • How to resolve this PostgreSQL error on OS 10.6 (Snow Leopard)

    - by wgpubs
    I followed the instructions for setting up postgresql from this site All seems to go fine until I try: createuser --superuser myname -U postgres I get the following exception: createuser: could not connect to database postgres: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"? For the life of me I can't figure out how to resolve this. Any ideas???

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  • Mysql - datetime and date-range comparsion

    - by Ockonal
    Hello guys, I have datetime-row in mysql database. I have to check time between now and that date using php. If the range is bigger then 1 month - do somtething. I tried something like this: $dateFromMysql = strtotime($rowData); $currentDate = date("m/d/y g:i A"); And then comparsion by hands. It's ugly.

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  • Akka framework support for finding duplicate messages

    - by scala_is_awesome
    I'm trying to build a high-performance distributed system with Akka and Scala. If a message requesting an expensive (and side-effect-free) computation arrives, and the exact same computation has already been requested before, I want to avoid computing the result again. If the computation requested previously has already completed and the result is available, I can cache it and re-use it. However, the time window in which duplicate computation can be requested may be arbitrarily small. e.g. I could get a thousand or a million messages requesting the same expensive computation at the same instant for all practical purposes. There is a commercial product called Gigaspaces that supposedly handles this situation. However there seems to be no framework support for dealing with duplicate work requests in Akka at the moment. Given that the Akka framework already has access to all the messages being routed through the framework, it seems that a framework solution could make a lot of sense here. Here is what I am proposing for the Akka framework to do: 1. Create a trait to indicate a type of messages (say, "ExpensiveComputation" or something similar) that are to be subject to the following caching approach. 2. Smartly (hashing etc.) identify identical messages received by (the same or different) actors within a user-configurable time window. Other options: select a maximum buffer size of memory to be used for this purpose, subject to (say LRU) replacement etc. Akka can also choose to cache only the results of messages that were expensive to process; the messages that took very little time to process can be re-processed again if needed; no need to waste precious buffer space caching them and their results. 3. When identical messages (received within that time window, possibly "at the same time instant") are identified, avoid unnecessary duplicate computations. The framework would do this automatically, and essentially, the duplicate messages would never get received by a new actor for processing; they would silently vanish and the result from processing it once (whether that computation was already done in the past, or ongoing right then) would get sent to all appropriate recipients (immediately if already available, and upon completion of the computation if not). Note that messages should be considered identical even if the "reply" fields are different, as long as the semantics/computations they represent are identical in every other respect. Also note that the computation should be purely functional, i.e. free from side-effects, for the caching optimization suggested to work and not change the program semantics at all. If what I am suggesting is not compatible with the Akka way of doing things, and/or if you see some strong reasons why this is a very bad idea, please let me know. Thanks, Is Awesome, Scala

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  • get data from a querystring

    - by regwe
    i have this querystring that shall open up my page. http://www.a1-one.com/[email protected]&stuid=123456 Now when this page loads, on page_load, I want to pick up email and stuid in two different variables. So I can use them to insert into my database (sql server) how can this be done in vb.net

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  • Problem with setting text into a uneditable JTextField

    - by The Z
    I have a tabbed pane with a couple of uneditable JTextFields which I want to fill in with information from a database. However, when I set the text in the text fields to anything, it doesn't show up when I run the program. When I get the text and print it out, it does show. What could be the problem here?

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  • PHP MySQL Select multiple tables

    - by Jordan Pagaduan
    Is it posibble to select 3 tables at a time in 1 database? Table 1: employee -- employee_id -- first_name -- last_name -- middle_name -- birthdate -- address -- gender -- image -- salary Table 2: logs -- log_id -- full_name -- employee_id -- date -- time -- status Table 2: logout -- log_id -- full_name -- employee_id -- date -- time -- status I wanted to get the value of employee table where $id of selected. Then the $id also get the value of log.time, log.date, logout.time, and logout.date. I already try using UNION but nothing happens.

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  • Google Calendar feed api deleted events

    - by hsmit
    I'm syncing the Google Calendar with my application (I store events in a database). When an event is updated I can easily find the last updates by sorting the event feed on the 'updated' order. However, if an event is removed / deleted, how can I track this update from the feed?

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  • How can I create a Zerofilled value using JavaScript?

    - by Wilco
    What is the recommended way to zerofill a value in JavaScript? I imagine I could build a custom function to pad zeros on to a typecasted value, but I'm wondering if there is a more direct way to do this? Note: By "zerofilled" I mean it in the database sense of the word (where a 6-digit zerofilled representation of the number 5 would be "000005").

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  • Change date format (in DB or output) to dd/mm/yyyy - PHP MySQL

    - by Jess
    MySQL stores the date in my database (by default) as 'YYYY-MM-DD' The field type for my date is 'DATE' (I do not need any time storage).. Is there a simple way to change it by default to DD/MM/YYYY ? I call up different dates in 2 different tables, and no where in any of my code do I have anything resembling a date variable or anything! Hopefully this is a straight forward change?

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  • Serializing persistent/functional data structures

    - by Rob
    Persistent data structures depend on the sharing of structure for efficiency. For an example, see here. How can I preserve the structure sharing when I serialize the data structures and write them to a file or database? If I just naively traverse the datastructures, I'll store the correct values, but I'll lose the structure sharing. I'd like to be able to save data-structures with shared components to a file, restore them, and still have most of the structure shared in the restored data.

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  • Avoiding Zends Error Messages

    - by Kieran
    I am using the Zend Framework for ACL's in codeigniter but if something is not right in the database or there is an error with the code that interfaces with the framework then the framework displays its own error messages. Is there a way to suppress these?

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  • MS Access question

    - by Scott Jackson
    I've an access database table with 3 fields : Purchase date Warranty time Warranty expiry Warranty time has 1, 2, 3, 4, 5 in it which corresponds to years. How can I auto-populate the 'Warranty expiry' field (which is a date field) by looking at the 'Purchase date' and then adding on the 'Warranty time' (warranty time will be 1 = 365 days, 2 = 730 days, etc)?

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  • How do I create a safe local development environment?

    - by docgnome
    I'm currently doing web development with another developer on a centralized development server. In the past this has worked alright, as we have two separate projects we are working on and rarely conflict. Now, however, we are adding a third (possible) developer into the mix. This is clearly going to create problems with other developers changes affecting my work and vice versa. To solve this problem, I'm thinking the best solution would be to create a virtual machine to distribute between the developers for local use. The problem I have is when it comes to the database. Given that we all develop on laptops, simply keeping a local copy of the live data is plain stupid. I've considered sanitizing the data, but I can't really figure out how to replace the real data, with data that would be representative of what people actually enter with out repeating the same information over and over again, e.g. everyone's address becomes 123 Testing Lane, Test Town, WA, 99999 or something. Is this really something to be concerned about? Are there tools to help with this sort of thing? I'm using MySQL. Ideally, if I sanitized the db it should be done from a script that I can run regularly. If I do this I'd also need a way to reduce the size of the db itself. (I figure I could select all the records created after x and whack them and all the records in corresponding tables out so that isn't really a big deal.) The second solution I've thought of is to encrypt the hard drive of the vm, but I'm unsure of how practical this is in terms of speed and also in the event of a lost/stolen laptop. If I do this, should the vm hard drive file itself be encrypted or should it be encrypted in the vm? (I'm assuming the latter as it would be portable and doesn't require the devs to have any sort of encryption capability on their OS of choice.) The third is to create a copy of the database for each developer on our development server that they are then responsible to keep the schema in sync with the canonical db by means of migration scripts or what have you. This solution seems to be the simplest but doesn't really scale as more developers are added. How do you deal with this problem?

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  • about sql server merge statement

    - by George2
    Hello everyone, I am using SQL Server 2008 Enterprise DB and using the new Merge statement (when source and target are both SQL Server 2008 DB tables), and it works well. I have another database table which is hosted in SQL Server 2005 Enterprise DB. I want to know whether Merge statement could using one table of SQL Server 2008 as source, and another tableof SQL Server 2005 as target? The two databases may not exist on the same machine. thanks in advance, George

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  • running same query in different databases

    - by user316833
    I wrote a query that I want to run in several access databases. I have 1000+ access databases with the same tables (same names, same fields). So far, I have been manually copying this query from a txt file to the sql view in the access query design screen for each database and then run it. I did not need to change the query language - everything is the same for the 1000 databases. Is there a way to automate this?

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  • SQL Server: How to get a subitem of sp_helplanguage ?

    - by Quandary
    Question: I can get the SQL Server database language by querying: SELECT @@language And I can get further info via EXEC sp_helplanguage How can I query for a column of sp_helplanguage where name= @@language I do SELECT * FROM sp_helplanguage WHERE name='DEUTSCH' but that obviously doesn't work. What's the correct way to query it ?

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