Search Results

Search found 33569 results on 1343 pages for 'sql backup and restore'.

Page 41/1343 | < Previous Page | 37 38 39 40 41 42 43 44 45 46 47 48  | Next Page >

• New version of SQL Server Data Tools is now available

  - by jamiet

  If you don’t follow the SQL Server Data Tools (SSDT) blog then you may not know that two days ago an updated version of SSDT was released (and by SSDT I mean the database projects, not the SSIS/SSRS/SSAS stuff) along with a new version of the SSDT Power Tools. This release incorporates a an updated version of the SQL Server Data Tier Application Framework (aka DAC Framework, aka DacFX) which you can read about on Adam Mahood’s blog post SQL Server Data-Tier Application Framework (September 2012) Available. DacFX is essentially all the gubbins that you need to extract and publish .dacpacs and according to Adam’s post it incorporates a new feature that I think is very interesting indeed: Extract DACPAC with data – Creates a database snapshot file (.dacpac) from a live SQL Server or Windows Azure SQL Database that contains data from user tables in addition to the database schema. These packages can be published to a new or existing SQL Server or Windows Azure SQL Database using the SqlPackage.exe Publish action. Data contained in package replaces the existing data in the target database. In short, .dacpacs can now include data as well as schema. I’m very excited about this because one of my long-standing complaints about SSDT (and its many forebears) is that whilst it has great support for declarative development of schema it does not provide anything similar for data – if you want to deploy data from your SSDT projects then you have to write Post-Deployment MERGE scripts. This new feature for .dacpacs does not change that situation yet however it is a very important pre-requisite so I am hoping that a feature to provide declaration of data (in addition to declaration of schema which we have today) is going to light up in SSDT in the not too distant future. Read more about the latest SSDT, Power Tools & DacFX releases at: Now available: SQL Server Data Tools - September 2012 update! by Janet Yeilding New SSDT Power Tools! Now for both Visual Studio 2010 and Visual Studio 2012 by Sarah McDevitt SQL Server Data-Tier Application Framework (September 2012) Available by Adam Mahood @Jamiet

  Read the article

• "Oracle", "Sybase", "SQL Server" vs just "SQL/JDBC" in the CV

  - by bobah

  How would you define a testable measure of the expertise that, if you're honest with yourself, lets you write in your CV words "Oracle", "Sybase", or "SQL Server" and not just "Relational Databases, SQL, JDBC" in your software developer's CV? What every XXX-developer (XXX - a vendor name) should know? The question is similar to http://stackoverflow.com/questions/2119859/questions-every-good-database-sql-developer-should-be-able-to-answer but is vendor-specific. Below is a start of the list as an example, demonstrate what kind of answers I am hoping to get. If you are expert in X then you know that Y (X - Y below): Sybase/SQL Server - they are very similar, Sybase is much more expensive Sybase/SQL Server - for Java you can use either native Sybase/JSQLDB driver or jTDS that is using TDS protocol and can connect to SQL Server as well, TDS traffic can be dumped and analyzed with hexdump command Sybase/SQL Server - for C++ you can use FreeTDS to connect to any, for Perl - same Sybase/SQL Server - a query can return multiple result sets and return codes, all need to be processes otherwise errors can happen Sybase/SQL Server - sp_help, sp_helptext Sybase/SQL Server - your tables/views/procedures are under DBName/dbo/... Sybase - for C++ on Linux you can use Sybase client API to connect (at least until recently) SQL Server - JDBC driver has a configurable transparent failover capability Oracle - for C++ Linux one can use OTLv4 that is a very powerful yet lightweight wrapper around Oracle client API Oracle compilation (contributors: ammoQ) PLSQL Java Stored Procedures '' is null Hierarchical Query Analytic Functions Oracle Text

  Read the article

• Restore Bak File created on Windows XP pro in Windows XP Pro 64

  - by Kobojunkie

  I have a situation that I need help with. I backed up my Files on Windows XP using the System BackUp utility/wizard, and then Installed a new operating system on the machine. Now I want to restore my old files via the .bak file but it is not being recognized at all. Did I do this wrong or is there a way to still get back my old files on my new OS ? Thanks in advance!

  Read the article

• Replication: SQL Server 2008 Publisher with SQL Server Express 2005 Subscriber

  - by Jeremy

  Here is the setup: SQL Server 2008 Enterprise Server with a Merge Publication. SQL Server 2005 Express with pull subscription. There is no web or ftp setup. This is direct merge replication. Using the RMO objects from C#, I get a "class cannot be found." COM Error when accessing the MergePullSubscription.SynchronizationAgent property. I've tried with both the 2008 RMO dll's (version 10 dll's) and the 2005 RMO dll's (version 9 dll's). When trying to use replmerge.exe, I get the following: 2010-04-10 04:12:05.263 Microsoft SQL Server Merge Agent 9.00.1399.06 2010-04-10 04:12:05.294 Copyright (c) 2000 Microsoft Corporation 2010-04-10 04:12:05.294 2010-04-10 04:12:05.294 The timestamps prepended to the output lines are express ed in terms of UTC time. 2010-04-10 04:12:05.294 User-specified agent parameter values: -Publisher SUN -PublisherDB PRIMROSE -PublisherSecurityMode 1 -Publication PRIMROSE -Distributor SUN -DistributorSecurityMode 1 -Subscriber PVILLE\SQLEXPRESS -SubscriberSecurityMode 1 -SubscriberDB PRIMROSE -SubscriptionType 1 -DistributorLogin sa -DistributorPassword ********** -DistributorSecurityMode 0 -PublisherLogin sa -PublisherPassword ********** -PublisherSecurityMode 0 -SubscriberLogin sa -SubscriberPassword ********** -SubscriberSecurityMode 0 2010-04-10 04:12:05.325 Connecting to Subscriber 'PVILLE\SQLEXPRESS' 2010-04-10 04:12:05.481 Connecting to Distributor 'SUN' 2010-04-10 04:12:05.513 The version of SQL Server running at the Distributor(10. 0.2531.??????????????????) is not compatible with the version of SQL Server runn ing at the Subscriber(9.00.1399.???????L?L?LHL?L?L?L?,?). 2010-04-10 04:12:05.513 Category:NULL Source: Merge Process Number: -2147200979 Message: The version of SQL Server running at the Distributor(10.0.2531.???????? ??????????) is not compatible with the version of SQL Server running at the Subs criber(9.00.1399.???????L?L?LHL?L?L?L?,?). Any ideas?

  Read the article

• Oracle SQL Developer is for Oracle Database

  - by thatjeffsmith

  What is Oracle SQL Developer? Well, according to this document on OTN… What is SQL Developer? Date: May 2014 Oracle SQL Developer is the Oracle Database IDE. A free graphical user interface, Oracle SQL Developer allows database users and administrators to do their database tasks in fewer clicks and keystrokes. A productivity tool, SQL Developer’s main objective is to help the end user save time and maximize the return on investment in the Oracle Database technology stack. Ok, sounds pretty straightforward. Where does the confusion lie then? Some People Use SQL Developer to Connect to 3rd Party Databases SQL Developer allows you to register 3rd party database JDBC drivers. The 3rd party being a company OTHER than Oracle that makes a database product. You know who they are (SAP, MSFT, IBM, etc.) Registering 3rd party JDBC drivers in SQL Developer But maybe you don’t understand why we support these types of connections? It’s for one driving reason. To Help You Migrate to Oracle Database Yes, you get a worksheet and a tree to query and browse those systems. But, the real meat and bones there are around our migration projects and our translation scratch editor. At the end of the day, it’s there so you can move your data from say Sybase ASE to Oracle Database. On a side note, the migration technology was previously available in a separate application, the Migration Workbench. The technology and the awesome people behind it were folded into SQL Developer. So when asked what SQL Developer is, I say it’s the Database IDE and the official 3rd party database migration to Oracle platform. So anyways, when you ask for better support for another 3rd party provider, we deliver that support based on that business driver. If another 3rd party database jdbc driver is introduced, it’s because we have a lot of customers migrating from that platform. We’re not adding it to make it easier for you to work with SQL Server on your Mac. But, if you find that useful – that is cool. It’s just not why we’ve got the support for SQL Server connections in SQL Developer.

  Read the article

• T-SQL Dynamic SQL and Temp Tables

  - by George

  It looks like #temptables created using dynamic SQL via the EXECUTE string method have a different scope and can't be referenced by "fixed" SQLs in the same stored procedure. However, I can reference a temp table created by a dynamic SQL statement in a subsequence dynamic SQL but it seems that a stored procedure does not return a query result to a calling client unless the SQL is fixed. A simple 2 table scenario: I have 2 tables. Let's call them Orders and Items. Order has a Primary key of OrderId and Items has a Primary Key of ItemId. Items.OrderId is the foreign key to identify the parent Order. An Order can have 1 to n Items. I want to be able to provide a very flexible "query builder" type interface to the user to allow the user to select what Items he want to see. The filter criteria can be based on fields from the Items table and/or from the parent Order table. If an Item meets the filter condition including and condition on the parent Order if one exists, the Item should be return in the query as well as the parent Order. Usually, I suppose, most people would construct a join between the Item table and the parent Order tables. I would like to perform 2 separate queries instead. One to return all of the qualifying Items and the other to return all of the distinct parent Orders. The reason is two fold and you may or may not agree. The first reason is that I need to query all of the columns in the parent Order table and if I did a single query to join the Orders table to the Items table, I would be repoeating the Order information multiple times. Since there are typically a large number of items per Order, I'd like to avoid this because it would result in much more data being transfered to a fat client. Instead, as mentioned, I would like to return the two tables individually in a dataset and use the two tables within to populate a custom Order and child Items client objects. (I don't know enough about LINQ or Entity Framework yet. I build my objects by hand). The second reason I would like to return two tables instead of one is because I already have another procedure that returns all of the Items for a given OrderId along with the parent Order and I would like to use the same 2-table approach so that I could reuse the client code to populate my custom Order and Client objects from the 2 datatables returned. What I was hoping to do was this: Construct a dynamic SQL string on the Client which joins the orders table to the Items table and filters appropriate on each table as specified by the custom filter created on the Winform fat-client app. The SQL build on the client would have looked something like this: TempSQL = " INSERT INTO #ItemsToQuery OrderId, ItemsId FROM Orders, Items WHERE Orders.OrderID = Items.OrderId AND /* Some unpredictable Order filters go here */ AND /* Some unpredictable Items filters go here */ " Then, I would call a stored procedure, CREATE PROCEDURE GetItemsAndOrders(@tempSql as text) Execute (@tempSQL) --to create the #ItemsToQuery table SELECT * FROM Items WHERE Items.ItemId IN (SELECT ItemId FROM #ItemsToQuery) SELECT * FROM Orders WHERE Orders.OrderId IN (SELECT DISTINCT OrderId FROM #ItemsToQuery) The problem with this approach is that #ItemsToQuery table, since it was created by dynamic SQL, is inaccessible from the following 2 static SQLs and if I change the static SQLs to dynamic, no results are passed back to the fat client. 3 around come to mind but I'm look for a better one: 1) The first SQL could be performed by executing the dynamically constructed SQL from the client. The results could then be passed as a table to a modified version of the above stored procedure. I am familiar with passing table data as XML. If I did this, the stored proc could then insert the data into a temporary table using a static SQL that, because it was created by dynamic SQL, could then be queried without issue. (I could also investigate into passing the new Table type param instead of XML.) However, I would like to avoid passing up potentially large lists to a stored procedure. 2) I could perform all the queries from the client. The first would be something like this: SELECT Items.* FROM Orders, Items WHERE Order.OrderId = Items.OrderId AND (dynamic filter) SELECT Orders.* FROM Orders, Items WHERE Order.OrderId = Items.OrderId AND (dynamic filter) This still provides me with the ability to reuse my client sided object-population code because the Orders and Items continue to be returned in two different tables. I have a feeling to, that I might have some options using a Table data type within my stored proc, but that is also new to me and I would appreciate a little bit of spoon feeding on that one. If you even scanned this far in what I wrote, I am surprised, but if so, I woul dappreciate any of your thoughts on how to accomplish this best.

  Read the article

• Restore data from one Windows edition to another

  - by Lindhe94

  I have a Swedish Windows 7 Home Premium on my PC, and I really want to change system language to English. I know that Home Premium can't change system language (only W7 Ultimate does that), so I consider buying an English version and make a clean install. However I do have many settings, programs etc that I don't want to lose. I therefore have two questions: Can I take a backup of my Swedish W7 Home Premium, install the English W7 Home Premium and then restore everything back to normal, except the system language is now English? Can I take a backup of my Swedish W7 Home Premium, install W7 Ultimate and then restore everything back to normal (now with the option to change system language)? Thanks!

  Read the article

• How can I detect which version of SQL (eg SQL 2008 or SQL Azure)

  - by Mark Redman

  I need to detect which version of SQL I am dealing with to perorm various tasks, I need specifically detect if I am on SQL 2008 or SQL Azure. How can I do this with detection code written in SQL?

  Read the article

• Exchange backup verification shows no files

  - by Olaf

  [SBS2003SP2] If i read the exhange log it shows the backup contains no files just folders and the total size seems to be Ok. I i try to restore the folders are empty... But the 14 files that where backupped dissapeared in the verification log?! Other backups on the same medium turned out to be fine. Any idea what's wrong here? This is my log: Backup Status Operation: Backup Active backup destination: File Media name: "testbackup.bkf created 2-6-2010 at 11:25" Volume shadow copy creation: Attempt 1. Backup of "SERVER1\Microsoft Information Store\First Storage Group" Backup set #1 on media #1 Backup description: "Set created 2-6-2010 at 11:25" Media name: "testbackup.bkf created 2-6-2010 at 11:25" Backup Type: Normal Backup started on 2-6-2010 at 11:26. Backup completed on 2-6-2010 at 12:21. Directories: 4 Files: 14 Bytes: 26.842.932.104 Time: 55 minutes and 38 seconds Verify Status Operation: Verify After Backup Active backup destination: File Active backup destination: \backup\Server1\Backup Files\testbackup.bkf Verify of "SERVER1\Microsoft Information Store\First Storage Group" Backup set #1 on media #1 Backup description: "Set created 2-6-2010 at 11:25" Verify started on 2-6-2010 at 12:21. Verify completed on 2-6-2010 at 12:47. Directories: 4 Files: 0 Different: 0 Bytes: 26.842.932.104 Time: 25 minutes and 46 seconds

  Read the article

• Sql Server 2005 database lost, How to recover all records. MDF/LDF size is same as it should be

  - by Shantanu Gupta

  Few months back, I installed a sql server 2005 on one of my client machine. I gave him a backup option to take backup timely but he never took any backup. Today he called me that "i m not able to see any record of mine." I visited at my clients system and saw that none of the record was present on the tables. There was not even a single row in any of the tables. Then I checked if he has any backup file which i found to be absent. I asked him the reason what could be the possible cause. He said it might be due to virus. After this I checked the size of mdf and ldf file and found it should be what it is. when i created his server mdf ldf file had 2MB of database now it is 83 MB and 193Mb mdf/ldf respectively. This shows the data is still present in it but it is not being displayed. What could be the possible cause and how can i restore all data back to my tables ?

  Read the article

• Windows Server 2008 System State Backup

  - by MJ

  What I'm looking for, is info on what is contained in the server 2008 system state backup. It is incredibly large (10+ G), and annoying to backup remotely. is there a way to take a full system state, and then do like a weekly incremental? I know the wbadmin tool, but its options are limited. I'm also looking for the option to remove the 2nd or 3rd oldest backup.

  Read the article

• Backup Exec 2010 throwing error trying to restore Exchange mailbox

  - by Mindflux

  Error category : Resource ErrorsError : e000848c - Unable to attach to a resource. Make sure that all selected resources exist and are online, and then try again. If the server or resource no longer exists, remove it from the selection list. Edit the selection list properties, click the View Selection DFor additional information regarding this error refer to link V-79-57344-33932 I've got the Exchange agent loaded on the Exchange server. Through talking with some other folks I've added the Exchange Management Console to the Media(Backup) server. None of this has helped. I can back up Exchange all day long, however I cannot restore from it. I've followed the link given (V-79-57344-33923) which goes here and none of that has helped either. Server is running: Win Server 2008 w/ SP2 (64 bit) Backup Exec 2010 I am backing up to a Tandberg T24 tape library.

  Read the article

• why is rdiff-backup not compatible with encfs ---reverse

  - by user330273

  I'm trying to use encfs with rdiff-backup to ensure that my backups to a remote server are encrypted. The easiest way to do this would be to use encfs --reverse - which means encfs will create a virtual encrypted file system, which I can then backup using rdiff-backup. Except that it doesn't work. Rdiff-backup fails every time with an "input/output error" on the encfs virtual filesystem. It seems I'm not the only one with this problem, but no one has said what the problem is: this person reported the same issue, but was just told to use sshfs instead (see below on that); in this question on serverfault, one of the answers just states that "rdiff-backup seems to have trouble accessing the EncFS-reverse filesystem." There's an open bug report on the Debian bug tracker(bug 731413, I can't post the link) on this bug, but it's been open since December 2013 with no response. Does anyone know what the problem actually is? Is there a workaround? I can't use the two most commonly suggested alternatives - sshfs and then running encfs on that, or using Duplicity - as both require a much higher bandwidth connection than I have access to (Duplicity requires regular full backups).

  Read the article

• How to restore a windows 7 system from a secondary drive

  - by Klas Mellbourn

  I have a stationary computer with Windows 7 Ultimate 64 bit. The primary (SSD) hard drive seems to have stopped working completely, it is not even visible in BIOS. The computer has a secondary hard drive (non-SSD, NTFS, 2TB). I have had Windows backup running and saving backups to that secondary drive. I am planning to buy a new SSD drive to replace the faulty one. I want to restore the backup to this new SSD drive. What is the most straightforward way to do this? A step-by-step description would be greatly appreciated. Further information: I have a Windows install DVD and the computer has a DVD-drive. The secondary drive is not bootable, so I cannot currently access it. The new SSD drive will probably not be identical to the original, so it might need different drivers

  Read the article

• How to backup a remote VPS machine?

  - by morpheous

  I am considering opting for a VPS solution, with the server running Ubuntu server. I am pretty new to this, and I need to come up with a backup policy for my server data. Initial data is likely to be about 80Mb, and I expect the data to grow at approximately 5Mb to 10 Mb a day. Can anyone recommend: A backup/restore policy (best practises for a small startup) Which tools to use for backup? Another thing that is not clear to me is - where are the files backed up to normally (in the case of remote servers). If the files are backed up to the same machine (or even to another machine but with the same host), there is potentially, a single point of failure). How do people normally backup their server data, and is the probability of machine meltdown or the host company server farm "catching fire" so remote as not to be worth worrying about - especially for a small (read one man) startup like me?

  Read the article

• How do I secure Sql Server 2008 R2

  - by Mark Tait

  I have both a dedicated and a VPS (from Fasthosts) virtual server - the web sites/applications I run on these, access Sql Server stored on the same web server. Until now, I have logged onto Sql Server on both the deidicated and VPS server, from Sql Server Management Studio - until I noticed in my server application logs, multiple attempts to logon to Sql Server using the 'sa' username, but failed password. So someone/bot is trying hard (repeatedly every couple of hours, for approx 20 attempts during each instance) to log on... so obviously I have to lock down access to Sql Sever remotely. What I have done is gone into Configuration Manager, and in Sql Server Network Configuration - Protocols for Sql2008 and also in Sql Native Client 10.0 Configuration - Client Protocols - I have diabled Named Pipes, TCP/IP (and VIA by default). I have left Shared Memory enabled. I also disabled in Sql Server Services, the Sql Server Browser. Now the only way I can manage the databases on these servers, is by logging on to them via Remote Desktop. Can anyone confirm if this is the correct way of stopping anyone maliciously logging on to Sql Server? (I'm not a DBA or security expert - and there are hundreds of articles advising all different ways - but I was hoping for the experts here to confirm, or otherwise, if what I've done is correct) Thank you, Mark

  Read the article

• One-Way Backup Service? [closed]

  - by Jon Rodriguez

  Up until a month ago, my girlfriend has used MobileMe to backup all the files on her MacBook. This turned out terribly when a quirk of MobileMe caused it to erase all of her files on MobileMe, and then sync the newly-erased MobileMe down to her computer, erasing everything. A week's worth of college essays and CS homework were gone. Now, I am terrified of any commercial cloud-backup solutions because of the possibility of this happening. Going off the list provided in these answers, could you please help me find a good backup service that is completely one-way? I want a service where there is literally not a single line of code that has the possibility of writing to my computer's drive. I want a pure one-way backup service.

  Read the article

• Backup strategies for linux based file servers

  - by iceman

  I want to know some enterprise-wide backup strategies used for linux based file servers. What are the tools and techniques used when making a backup. for e.g when a backup fails on a machine, it should email the admin about the failure and also a log file. This won't happen incase the HDD fails and the system is completely out of work, but in other cases where a backup didn't take place, the admin should be able to know. What tool/scripts can be used for this particular scenarios?

  Read the article

• Problem with importing an mdf created with SQL Server Express 2008 into SQL Server 2005

  - by user252160

  The question is probably extremely easy to resolve, but I need to resolve it because I need to carry on with my project. I am using SQL Server Express 2008 at home, and I've been working on an ASP.NET MVC app that stores my DB in an mdf file in the project's folder. The problem is that the SQL Server in the Uni labs is SQL Server 2005, and when I try to open the mdf file with the VS Server Explorer,It says that the version of the mdf file is more than the server can accept. The only option that comes to my mind is exporting the DB as an sql file, just like I've done it thousand times with phpmyadmin. the thing is that the SQL Management Studio Express is not the most usable tool in the world, and for some strange reason all the articles I could find in Google were irrelevant. Please, help.

  Read the article

• Difference between Detach/Attach and Restore/BackUp a DB

  - by SAMIR BHOGAYTA

  Transact-SQL BACKUP/RESTORE is the normal method for database backup and recovery. Databases can be backed up while online. The backup file size is usually smaller than the database files since only used pages are backed up. Also, in the FULL or BULK_LOGGED recovery model, you can reduce potential data loss by performing transaction log backups. Detaching a database removes the database from SQL Server while leaving the physical database files intact. This allows you to rename or move the physical files and then re-attach. Although one could perform cold backups using this technique, detach/attach isn't really intended to be used as a backup/recovery process. Commonly it is recommended that you use BACKUP/RESTORE for disaster recovery (DR) scenario and copying data from one location to another. But this is not absolute, sometimes for a very large database, if you want to move it from one location to another, backup/restore process may spend a lot of time which you do not like, in this case, detaching/attaching a database is a better way since you can attach a workable database very fast. But you need to aware that detaching a database will bring it offline for a short time and detaching/attaching does not provide DR function. For more information about detaching and attaching databases, you can refer to: Detaching and Attaching Databases http://technet.microsoft.com/en-us/library/ms190794.aspx

  Read the article

• Cumulative Updates for SQL Server 2005 SP3 and 2008 R2 are available

  - by AaronBertrand

  After releasing SQL Server 2005 SP4 on Friday (you can read more about it here ), the release services team did not hang up their hats for the Christmas holiday, but continued working on other releases. KB #2438344 : Cumulative update package 13 for SQL Server 2005 Service Pack 3 This brings your SQL Server 2005 SP3 build number to 9.00.4315 KB #2438347 : Cumulative Update package 5 for SQL Server 2008 R2 This brings your SQL Server 2008 R2 build number to 10.5.1753 NOTES: You will not be able to...(read more)

  Read the article

• Recap - SQL Saturday 151 in Orlando

  - by KKline

  It's always a feel-good experience for me to return to SQL Saturday in Orlando, the place where SQL Saturdays were started by Andy Warren ( Twitter | Blog ). On this trip, I delivered a full-day, pre-conference seminar on Troubleshooting and Performance Tuning SQL Server. I also delivered a session on SQL Server Internals and Architecture to a totally packed house. For those of you who emailed me directly, here's the link for the special SQL Sentry offer . I got to attend the extended events session...(read more)

  Read the article

• SQL Azure Federations and Semantic Search by the SQL product team in London tonight (Monday)

  - by simonsabin

  Don’t forget that tonight we have Michael Rys from the SQL Server Product Team presenting on the Federation support coming to SQL Azure and the Semantic search coming in SQL Server Denali. This is a must attend evening for anyone that is serious about scaling SQL or doing search in SQL Server. Michael also has a few other hats including Microsoft’s representative on the W3C XML Query Working Group. To register go to http://sqlsocial20110613.eventbrite.com/   Ps Beer and Pizza will be laid on...(read more)

  Read the article

• SQL 2014 does data the way developers want

  - by Rob Farley

  A post I’ve been meaning to write for a while, good that it fits with this month’s T-SQL Tuesday, hosted by Joey D’Antoni (@jdanton) Ever since I got into databases, I’ve been a fan. I studied Pure Maths at university (as well as Computer Science), and am very comfortable with Set Theory, which undergirds relational database concepts. But I’ve also spent a long time as a developer, and appreciate that that databases don’t exactly fit within the stuff I learned in my first year of uni, particularly the “Algorithms and Data Structures” subject, in which we studied concepts like linked lists. Writing in languages like C, we used pointers to quickly move around data, without a database in sight. Of course, if we had a power failure all this data was lost, as it was only persisted in RAM. Perhaps it’s why I’m a fan of database internals, of indexes, latches, execution plans, and so on – the developer in me wants to be reassured that we’re getting to the data as efficiently as possible. Back when SQL Server 2005 was approaching, one of the big stories was around CLR. Many were saying that T-SQL stored procedures would be a thing of the past because we now had CLR, and that obviously going to be much faster than using the abstracted T-SQL. Around the same time, we were seeing technologies like Linq-to-SQL produce poor T-SQL equivalents, and developers had had a gutful. They wanted to move away from T-SQL, having lost trust in it. I was never one of those developers, because I’d looked under the covers and knew that despite being abstracted, T-SQL was still a good way of getting to data. It worked for me, appealing to both my Set Theory side and my Developer side. CLR hasn’t exactly become the default option for stored procedures, although there are plenty of situations where it can be useful for getting faster performance. SQL Server 2014 is different though, through Hekaton – its In-Memory OLTP environment. When you create a table using Hekaton (that is, a memory-optimized one), the table you create is the kind of thing you’d’ve made as a developer. It creates code in C leveraging structs and pointers and arrays, which it compiles into fast code. When you insert data into it, it creates a new instance of a struct in memory, and adds it to an array. When the insert is committed, a small write is made to the transaction to make sure it’s durable, but none of the locking and latching behaviour that typifies transactional systems is needed. Indexes are done using hashes and using bw-trees (which avoid locking through the use of pointers) and by handling each updates as a delete-and-insert. This is data the way that developers do it when they’re coding for performance – the way I was taught at university before I learned about databases. Being done in C, it compiles to very quick code, and although these tables don’t support every feature that regular SQL tables do, this is still an excellent direction that has been taken. @rob_farley

  Read the article

• rsync & rdiff backup combination giving erros

  - by Maikel van Leeuwen

  On the server I'm making every day a backup with rdiff-backup like: rdiff-backup /home/ /backup/home Then every week I want to make a rsync backup offside with sshfs like: rsync -avz /home/server/backup/home /backup/server-home/ This is giving me the following errors: Fatal Error: Previous backup to /backup/server-home/. seems to have failed. Rerun rdiff-backup with --check-destination-dir option to revert directory to state before unsuccessful session. Does anybody have a good solution to deal with this errors/situation? *2x edit for typo's

  Read the article

< Previous Page | 37 38 39 40 41 42 43 44 45 46 47 48  | Next Page >