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  • Mimicking Google's Persistant Disks -- Is this a logical FreeBSD disaster recovery strategy?

    - by Casey Jordan
    I am looking into FreeBSD to provide a more comprehensive backup and disaster recovery strategy for database servers. Ideally I want to mimic what google is doing with "Persistant disks" https://developers.google.com/compute/docs/disks#snapshots I am hoping someone who knows more about FreeBSD can validate these ideas/questions: I have read that FreeBSD can take instant disk snapshots, therefore if our databases trigger a consistent state (Block all writes, and flush buffers to disk), I would assume I could take snapshots every hour without service interruption for more than a few seconds. Is this true? Is there a way to take snapshots and back them up offsite easily? Can this be done incrementally as to save how much disk space is actually used? If a rollback needed to be done, how long does this typically take? Is a rollback also instantaneous? Thanks!

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  • Uptime concerns in case of AWS outage

    - by Aditya Patawari
    I am running an Elastic Load Balancer backup by 2 instances in different Availability Zones in US East. I am using Multi-AZ RDS as well. Ideally this should ensure that if one AZ goes down, it should not effect the app because everything is spread across multiple AZs. But the recent AWS outage took the app down for a long time. I am not sure how this can happen. It would be great if someone can point out what went wrong. Major question here I have is how can I avoid this in future? I can setup app servers across different regions or even providers and use DNS for load balancing but what do I do with MySQL? Read Replicas will introduce some lag which I would want to avoid.

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  • Uninstall grub from logical partition

    - by Andrew Fleenor
    I'm multi-booting with Windows 7 x64 and (at least) Linux Mint. Because I hadn't yet made a backup of my MBR, when I installed Linux mint on a logical partition, I told the installer to put GRUB on the partition instead of in the MBR. This turned out to be useless, as I need to use GRUB from a boot disk to get into the GRUB I installed... Before installing it in the MBR, I'd like to get it out of the partition, preferably without wiping and reinstalling Linux. I don't relish the prospect of going through two layers of GRUB when I want to boot Linux. How do I get it out, or what other options are available to me?

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  • Dynamically resizing CFWINDOW to fit content

    - by Ryan French
    Hi all, Am currently working on a site that uses a lot of cfwindow objects and I was wondering if anyone knows of a way to dynamically resize the window so that all the content fits in without the need for scroll bars. I have tried using the overflow=visible configuration but it doesnt seem to make a difference. Thanks in advance for any advice.

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  • SSIS Permissions issue

    - by Dave
    Hi All, How can we set permissions for users to only allow them to download SSIS packages from the production server and but deny them permissions to run any package in the Server. http://msdn.microsoft.com/en-us/library/ms141053(SQL.90).aspx If i assign users to any of the DB roles db_dtsadmin, db_dtsltduser, and db_dtsoperator they will automatically have permission to run the package. Appreciate your inputs. Thanks!

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  • Php framework for fast developing

    - by nucleartux
    Please advise a php framework for fast developing and for don't digress to write often using code(auth, db/orm,etc..). Requrements: Active community Easy to use simple many to many and many to one relations auth. mechanism RoR like Please sorry for english.

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  • Query having 2 Where Clause

    - by Harsha M V
    i am trying to login and want to validate username and password against the records in the database. I am not sure how to pass two Where clause public Boolean login(String username, String password) throws SQLException { Cursor mCursor = db.query(TABLE_USERS, new String[] { ID, KEY_NAME, KEY_USERNAME}, KEY_USERNAME + "=" + "'"+username+"'", KEY_PASSWORD + "=" + "'"+password+"'", null, null, null, null, null); if (mCursor.moveToFirst()) { return true; } return false; } Am getting a Syntax Error.

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  • Using Variables for Class Names in Python?

    - by Sam McAfee
    I want to know how to use variables for objects and function names in Python. In PHP, you can do this: $className = "MyClass"; $newObject = new $className(); How do you do this sort of thing in Python? Or, am I totally not appreciating some fundamental difference with Python, and if so, what is it?

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  • Does SQL Server guarantee sequential inserting of an identity column?

    - by balpha
    In other words, is the following "cursoring" approach guaranteed to work: retrieve rows from DB save the largest ID from the returned records for later, e.g. in LastMax later, "SELECT * FROM MyTable WHERE Id > {0}", LastMax In order for that to work, I have to be sure that every row I didn't get in step 1 has an Id greater than LastMax. Is this guaranteed, or can I run into weird race conditions?

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  • Example of xargs' -x option in action

    - by Ole Tange
    GNU xargs has option '-x'. The man page says: -x Exit if the size (see the -s option) is exceeded. But xargs seems to not care if -x is set or not. I have been unable to make an example in which the -x has any effect at all. Please provide two examples in which the only difference is an added -x and that produce different output.

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  • Pop Up to enter credentials

    - by user320969
    When I open my SharePoint site collection everytime I am getting the pop up to enter the credential. How I can get rid off this. I checked in the alternate access mapping but I couldnt figure out anything difference,as the internal URL and external URL s are same. Can anyone help me regarding this??

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  • SQL Complex Select - Trouble forming query

    - by JoshSpacher
    I have three tables, Customers, Sales and Products. Sales links a CustomerID with a ProductID and has a SalesPrice. select Products.Category, AVG(SalePrice) from Sales inner join Products on Products.ProductID = Sales.ProductID group by Products.Category This lets me see the average price for all sales by category. However, I only want to include customers that have more than 3 sales records or more in the DB. I am not sure the best way, or any way, to go about this. Ideas?

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  • Reference Paramters in C++: VERY basic example please.

    - by Sagistic
    I am trying to understand how to use reference parameters. There are several examples in my text, however they are too complicated for me to understand why and how to use them. Could anyone give me the MOST basic example of how/why to use one, and perhaps the difference with or without it (what would happen if you didn't attach the '&'). for example, if I've created a function: int doSomething(int& a, int& b), what would be the consequences of not putting in that '&.' I understand that reference variables are used in order to change a formal-reference, which then allows a two-way exchange of parameters. However, that is the extent of my knowledge, and a more concrete example would be of much help. Thank you.

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  • When should I think about implementing my User authentication / session?

    - by Jason N
    After spending some time wireframing my ideas, I want to start building my rails app. However, I'm well aware that later down the line I'd like to consider multiple user accounts. Should I be thinking about the implementation of this from this early stage, or is this something I can implement without too much fuss later? It seems like something that would be stupid to attempt later, but part of me just wants to get the guts of the thing working - a couple of simply forms and writing/reading some stuff from the db.

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  • Emacs bulk indent for Python

    - by Vernon
    Working with Python in Emacs if I want to add a try/catch to a block of code, I often find that I am having to indent the whole block, line by line. In Emacs, how do you indent the whole block at once. I am not an experienced Emacs user, but just find it is the best tool for working through ssh. I am using Emacs on the command line(Ubuntu), not as a gui, if that makes any difference.

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  • Page rendering time are not steady in IE6

    - by dan
    I have to support IE6 and I calculate rendering time by creating a timestamp in javascript at the beginning of the page and doing the difference when document.ready is fired in jQuery. If I do 3 pages load, the rendering times in milliseconds can look like this : page 1 : 735, 2672, 734 page 2 : 3063, 1516, 3375 page 3 : 8281, 2531, 3703 Why is that? How can I have more consistency?

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  • Python `if x is not None` or `if not x is None`?

    - by orokusaki
    I've always thought of the if not x is None version to be more clear, but Google's style guide implies (based on this excerpt) that they use if x is not None. Is there any minor performance difference (I'm assuming not), and is there any case where one really doesn't fit (making the other a clear winner for my convention)?* *I'm referring to any singleton, rather than just None. ...to compare singletons like None. Use is or is not.

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