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  • Easiest solution to sync an offline (local desktop application) database with a central server and multiple pc's?

    - by tyfius
    I have a desktop application which uses a local database. (This can be SQLite, SqlCe, PostgreSQL or any other database I will be able to install locally, I haven't decided which one to use yet.) The plan is to achieve the following: A user can subscribe to some kind of cloud service. If he does his local database should be synced with the online database (one for all users, or one per user, whatever the easiest solution is) so he will be able to sync his local database data between multiple PC's, can access his data online. (Much like dropbox does for files.) What is the best, easiest (and preferably cheapest) solution to achieve this? I am looking into DataObjects.net but I can't find much documentation about their Sync feature. Or, are there other alternatives? For example, I start with some kind of cloud service which allows local caching and use the local caching for users who do not subscribe to the service. Any pointers, tips or experiences are welcome.

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  • Too many columns to index - use mySQL Partitions?

    - by Christopher Padfield
    We have an application with a table with 20+ columns that are all searchable. Building indexes for all these columns would make write queries very slow; and any really useful index would often have to be across multiple columns increasing the number of indexes needed. However, for 95% of these searches, only a small subset of those rows need to be searched upon, and quite a small number - say 50,000 rows. So, we have considered using mySQL Partition tables - having a column that is basically isActive which is what we divide the two partitions by. Most search queries would be run with isActive=1. Most queries would then be run against the small 50,000 row partition and be quick without other indexes. Only issue is the rows where isActive=1 is not fixed; i.e. it's not based on the date of the row or anything fixed like that; we will need to update isActive based on use of the data in that row. As I understand it that is no problem though; the data would just be moved from one partition to another during the UPDATE query. We do have a PK on id for the row though; and I am not sure if this is a problem; the manual seemed to suggest the partition had to be based on any primary keys. This would be a huge problem for us because the primary key ID has no basis on whether the row isActive.

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  • Event Log time when Computer Start up / boot up

    - by Param
    Client OS - Window XP Domain Controller:- Window server 2008 Standard R2 I had one Window XP system, i want to find out when the system has started or boot ( at what time and at which date ). I don't know which parameter / word should i search in Event Log. For finding out shutdown time, i simply find the word "Shutdown" in Event Log. Can you guide me which word should i find for finding Start up or boot time

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  • Adding/Removing Users For Permissions in XP

    - by Brian
    Hello, I have some specific folders that I grant members of my team permissions to. So I'll share a specific folder and add them as permissions. But after they are done I usually remove them from the list of permitted users. I was wondering if it's possible to setup a bat file to achieve this, to make my life easier. I was wondering if WMI or powershell has those kinds of capabilities. Just curious. Thanks.

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  • Batch file installing executable only gives SYSTEM permissions

    - by Alex
    So, I have a couple of batch files that install some executables and they work, but when the executables setup shortcuts on the desktop only SYSTEM has access to them. Is there a way I can prevent that or make it so it adds Domain Users access or something like that. I realize that the batch files are ran under the SYSTEM context, but I'd like to find a way to clean up after them. Thanks in advance!

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  • Remotely Administer Workgroup Computers

    - by Steven
    At work, I can remotely administer other computers by first adding my domain account as a local admistrator on another computer. After that, I can use remote registry, computer management, and file sharing (\\computer\c$). How can I setup a remote user to be a local administrator on a simple home network without a domain (just a workgroup)?

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  • Network location is not on the Domain

    - by Kyle Brandt
    I have a computer joined to the domain, but it doesn't view the network "location" as being part of the domain. I have tried removing and rejoining the domain and this doesn't help: Other computers in the same network don't have this problem. I have also tried several different icons, including both the train and the airplane which doesn't seem to make a difference. At least using nslookup, the server seems to have connectivity with the DCs in the same site. There also seem to be some errors that suggest a NULL domain: Computer: OR-WEB05.ds.stackexchange.com Description: NtpClient was unable to set a domain peer to use as a time source because of failure in establishing a trust relationship between this computer and the '' domain in order to securely synchronize time. NtpClient will try again in 3473457 minutes and double the reattempt interval thereafter. The error was: The trust relationship between this workstation and the primary domain failed. (0x800706FD)

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  • Foreign keys and NULL in mySQL

    - by Industrial
    Hi everyone, Can I have a column in my values table (value) referenced as a foreign key to knownValues table, and let it be NULL whenever needed, like in the example: Table: values product type value freevalue 0 1 NULL 100 1 2 NULL 25 3 3 1 NULL Table: types id name prefix 0 length cm 1 weight kg 2 fruit NULL Table: knownValues id Type name 0 2 banana Note: The types in the table values & knownValues are of course referenced into the types table. Thanks!

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  • which is better, creating a view or a new table?

    - by Carson
    I have some demanding mysql queries that are needed to grap same datasets from several mysql tables. I am thinking of creating a table or view to gather all demanding columns from other tables, so as to increase performance. If I create that table, I may need to do extra insert / update / delete operation each time other tables updated. if I create view, I am worrying if the performance can be greatly improved. Because data from other tables are changing very frequently. Most likely, the view may need to be created first everytime before selecting it. Any ideas? e.g. how to cache? other extra measures I can do?

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  • Error 1069 the service did not start due to a logon failure

    - by Si.
    Our CruiseControl.NET service on Win2003 Server (VMWare Virtual) was recently changed from a service account to a user account to allow for a new part of our build process to work. The new user has "Log on as a service" rights, verified by checking Local Security Settings - Local Policies - User Rights Assignment, and the user password is set to never expire. The problem I'm facing is every time the service is restarted, I get the 1069 error as described in this questions subject. I have to go into the properties of the service (log on tab) and re-enter the password, even though it hasn't changed, and the user already has the appropriate rights. Once I enter the password apply the changes, a prompt appears telling me that the user has been granted log on as a service rights. The service will then start will no problems. Not a show stopper, but a pain none-the-less. Why isn't the password persisting with the service?

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  • GridView edit problem If primary key is editable (design problem)

    - by Nassign
    I would like to ask about the design of table based on it's editability in a Grid View. Let me explain. For example, I have a table named ProductCustomerRel. Method 1 CustomerCode varchar PK ProductCode varchar PK StoreCode varchar PK Quantity int Note text So the combination of the CustomerCode, StoreCode and ProductCode must be unique. The record is displayed on a gridview. The requirement is that you can edit the customer, product and storecode but when the data is saved, the PK constraint must still persist. The problem here is it would be natural for a grid to be able to edit the 3 primary key, you can only achieve the update operation of the grid view by first deleting the row and then inserting the row with the updated data. An alternative to this is to just update the table and add a SeqNo, and just enforce the unique constraint of the 3 columns when inserting and updating in the grid view. Method 2 SeqNo int PK CustomerCode varchar ProductCode varchar StoreCode varchar Quantity int Note text My question is which of the two method is better? or is there another way to do this?

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  • Shared printer can't be added

    - by Sandokan
    We have a small training network with server 2003, and XP clients and users in a AD domain. A printer is connected to a client with USB. We are trying to share the printer to all the users but it's not working. We come so far as the users can see the printer when they search for it. But when they try to add it, there appears a pop up window for user name and password. No matter what user name we try it doesn't work. We have checked the shared printer's security settings and they are all in order. Everyone has printer rights. But even with full rights it doesn't work. The only ones it works for are Domain Admins. Anyone have any ideas?

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  • how to store data with many categories and many properties efficiently?

    - by Mickey Shine
    We have a large number of data in many categories with many properties, e.g. category 1: Book properties: BookID, BookName, BookType, BookAuthor, BookPrice category 2: Fruit properties: FruitID, FruitName, FruitShape, FruitColor, FruitPrice We have many categories like book and fruit. Obviously we can create many tables for them (MySQL e.g.), and each category a table. But this will have to create too many tables and we have to write many "adapters" to unify manipulating data. The difficulties are: 1) Every category has different properties and this results in a different data structure. 2) The properties of every categoriy may have to be changed at anytime. 3) Hard to manipulate data if each category a table (too many tables) How do you store such kind of data?

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  • Application got shut down in WinXP if I close the 2nd window of that application.

    - by kinopyo
    I'm using WinXP and here is my question: I run an application, such as Chrome, there would be one app in the task bar, and it's fine. Suppose a new window of Chrome opened(so there would be 2 window and 2 in the task bar), and when I close that,the 2nd one, the whole application just shutdown. And so does chrome, firefox, evernote, Becky!(the email client), even TortoiseSVN. So I think there should be a generic problem cause these applications shutdown, such as the platform - WinXP. Please give me some advice or hint, anything comes to your mind would be helpful!

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  • Speeding up a group by date query on a big table in postgres

    - by zaius
    I've got a table with around 20 million rows. For arguments sake, lets say there are two columns in the table - an id and a timestamp. I'm trying to get a count of the number of items per day. Here's what I have at the moment. SELECT DATE(timestamp) AS day, COUNT(*) FROM actions WHERE DATE(timestamp) >= '20100101' AND DATE(timestamp) < '20110101' GROUP BY day; Without any indices, this takes about a 30s to run on my machine. Here's the explain analyze output: GroupAggregate (cost=675462.78..676813.42 rows=46532 width=8) (actual time=24467.404..32417.643 rows=346 loops=1) -> Sort (cost=675462.78..675680.34 rows=87021 width=8) (actual time=24466.730..29071.438 rows=17321121 loops=1) Sort Key: (date("timestamp")) Sort Method: external merge Disk: 372496kB -> Seq Scan on actions (cost=0.00..667133.11 rows=87021 width=8) (actual time=1.981..12368.186 rows=17321121 loops=1) Filter: ((date("timestamp") >= '2010-01-01'::date) AND (date("timestamp") < '2011-01-01'::date)) Total runtime: 32447.762 ms Since I'm seeing a sequential scan, I tried to index on the date aggregate CREATE INDEX ON actions (DATE(timestamp)); Which cuts the speed by about 50%. HashAggregate (cost=796710.64..796716.19 rows=370 width=8) (actual time=17038.503..17038.590 rows=346 loops=1) -> Seq Scan on actions (cost=0.00..710202.27 rows=17301674 width=8) (actual time=1.745..12080.877 rows=17321121 loops=1) Filter: ((date("timestamp") >= '2010-01-01'::date) AND (date("timestamp") < '2011-01-01'::date)) Total runtime: 17038.663 ms I'm new to this whole query-optimization business, and I have no idea what to do next. Any clues how I could get this query running faster?

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  • Windows8.1 create shortcuts with a custom group in My Computer

    - by user222010
    I have did many research about this. And what I could gather is something like this http://lifehacker.com/add-any-shortcut-to-my-computer-with-this-simple-tweak-479751317. The problem with that is it put the shortcuts under the Network Shortcuts, and this is not what I want. I want to create a shortcut in the My Computer explorer under a specific group such as Important Apps. So, how can I get that?

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