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• Mysql replication, one database server process

  - by Jonny

  On my development box, I want to experiment with a replication setup. But I don't want to create several mysqld processes (is it even possible?). I figured I have the main database in the process - have this as the master, then in the same process create the slave databases, and have the master data replicated into the databases that exist in the same db server. Is this possible? Is there an easier way of achieving this without trying to set up replication? Maybe to put it more simply: I want my Mysql server to be both master and slave(s) at the same time.

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• Using Substring() in XML FLOWR Queries

  - by Jonathan Kehayias

  Tonight I was monitoring the #sqlhelp hashtag on Twitter for a response to a question I asked when Randy Knight ( Twitter ) asked a question about using SUBSTRING in FLOWR statements with XML. #sqlhelp Is there a way to do a SQL Type "LIKE" or "SUBSTRING" in the where clause of FLWOR statement? Need to evaluate just first n chars. By the time I posted a response, Randy had figured out how to use the contains() function to solve his problem, but I am going to blog this because...(read more)

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• Implementing Oracle Grid Infrastructure on virtualized IBM Power Systems

  - by didier.wojciechowski

  The Oracle / IBM Joint Solutions Center is organizing workshop which is designed to allow each of you to successfully start new Oracle 11gR2 projects at your customer on IBM Power platform. July 5th-9th This course is focused on the new features in Oracle 11R2 Grid Infrastructure as well as it explains how Oracle Grid Infrastructure can be combined with IBM Power Virtualization :

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• CD/DVD cataloging software?

  - by NoCanDo

  I'm looking for freeware, or preferably open source CD/DVD cataloging applications. Right now I'm testing http://www.gentibus.com/us/Download.htm, anyone got any other suggestions? I'd like the software to be actively maintained and not released and left behind. I'm looking for software which allows me to catalog, sort, search my DVDs/CDs into databases. Like I've 1 group of 10 dvds only with Fonts etc. I want to read the content into a Database called "Fonts'". Another group of 5 DVD's with Stockimages, and I want to read all 5 DVDs into the Database "Stock Images". Then I want this software to be able to open Database "Stock Images", I want to be able to browse DVD 1 - 5 and to see DVD 1 - 5's contents without having the DVD's in the optical drive.

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• What antivirus do you recommend for dev boxes

  - by David Pokluda

  What antivirus would you recommend for computers used for windows development. Would you use an antivirus for these users? These users compile quite often and therefore read and write tons of files. If I deploy a slow performing antivirus, they will not be happy.

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• terminal tools and logs for debugging TCP issues

  - by kellogs

  I have a server which I am testing for functionality (not load, not stress) with tsung. 50 users / second, 100 total users. Judging from tsung (tsung is the testing framework) graphs, there TCP connections (red line) drops to 0 while the commenced user sessions (green line) does not. Server logs show nothing to be gripping onto, so I am speculating some kind of TCP issue. Should this be the case ? Where would I look further on the server, any logs / tools to be looking at ? Only SSH available, no GUI. > root@XMPP:~# cat /etc/lsb-release > DISTRIB_ID=Ubuntu > DISTRIB_RELEASE=11.10 > DISTRIB_CODENAME=oneiric > DISTRIB_DESCRIPTION="Ubuntu 11.10" Thank you

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• The most dangerous SQL Script in the world!

  - by DrJohn

  In my last blog entry, I outlined how to automate SQL Server database builds from concatenated SQL Scripts. However, I did not mention how I ensure the database is clean before I rebuild it. Clearly a simple DROP/CREATE DATABASE command would suffice; but you may not have permission to execute such commands, especially in a corporate environment controlled by a centralised DBA team. However, you should at least have database owner permissions on the development database so you can actually do your job! Then you can employ my universal "drop all" script which will clear down your database before you run your SQL Scripts to rebuild all the database objects. Why start with a clean database? During the development process, it is all too easy to leave old objects hanging around in the database which can have unforeseen consequences. For example, when you rename a table you may forget to delete the old table and change all the related views to use the new table. Clearly this will mean an end-user querying the views will get the wrong data and your reputation will take a nose dive as a result! Starting with a clean, empty database and then building all your database objects using SQL Scripts using the technique outlined in my previous blog means you know exactly what you have in your database. The database can then be repopulated using SSIS and bingo; you have a data mart "to go". My universal "drop all" SQL Script To ensure you start with a clean database run my universal "drop all" script which you can download from here: 100_drop_all.zip By using the database catalog views, the script finds and drops all of the following database objects: Foreign key relationships Stored procedures Triggers Database triggers Views Tables Functions Partition schemes Partition functions XML Schema Collections Schemas Types Service broker services Service broker queues Service broker contracts Service broker message types SQLCLR assemblies There are two optional sections to the script: drop users and drop roles. You may use these at your peril, particularly as you may well remove your own permissions! Note that the script has a verbose mode which displays the SQL commands it is executing. This can be switched on by setting @debug=1. Running this script against one of the system databases is certainly not recommended! So I advise you to keep a USE database statement at the top of the file. Good luck and be careful!!

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• Sharepoint database connection issue after upgrade to SQL Server 2008 R2

  - by Neil Hoff

  I took a backup of all our Sharepoint WSS 3.0 databases and restored them to a new Windows 2008 R2 server. The new SQL server has the same name and IP address as the old one. The only difference between the two is the new one has SQL 2008 R2 and the old one has SQL 2005. When I navigate to the sharepoint url I get this error: Cannot connect to the configuration database. I checked the logs at this location: "%commonprogramfiles%/Microsoft Shared/web server extensions/12/Logs" and found this error: System.Data.SqlClient.SqlException: Login failed. The login is from an untrusted domain and cannot be used with Windows authentication. Any ideas?

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• How to handle interruptions in developer work without losing concentration? [closed]

  - by tomaszs

  I work as a developer for some years now. Mainly the issue why it's antisocial work is because you need to spend much time programming. I've been always the kind of developer who likes to cut off from any sources of distraction and spend several hours on project because in this way i (as i hope) do it faster. There are also other kinds of developers, more social that can chat, read, watch movies while development and they are ok with this and don't hesitate to be interrupted in their work in any time and come back to the project without any problem. For me any distraction is source of frustration because i need to spend substantial time to load my mind with all info about the project and to concentrate back on the tasks. I always thought it's better to do this that way because project is completed faster. But it makes some things difficult: it's hard to chat with someone who needs to have some important info: because you are a bit frustrated when you know you loose your Zen. And sometimes its more important to chat with someone than to loose Zen. Well.. mostly in any other kind of work the ability to be "multitask" is very important. But as a developer and as a person it's also very important to stay social. And i see now that the problem of concentration makes it difficult to make the right chose: the cost of maintaining concentration is just sometimes so damn high! So is it only me that i have so little concentration skills so any interruption is for me a big deal? Maybe it's just i have so bad memory so that i dont remember all issues of a project so long? Or maybe i develop the project in a fashion that requires me to store so much info on my mind only to be able to start working with code? Or should i just accept that being more social will make me finish project slower and in the fashion that i personally consider non 100% productive? And it's just normal thing and i should just accept it and start to live like any other person who has many works and don't assume that programming is in any case other than any other work and i just do fuzz about the whole concentration thing? This is question for mid-pro developers. I think you was having the same dillema in your life. I would be glad if you could help me take the right road here because it's just driving me and i suppose people i work with crazy for years.

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• Table and Column Checksums

  - by Ricardo Peres

  Following my last posts on Change Data Capture and Change Tracking, here is another tip regarding tracking changes: table and colum checksums. The concept is: each time a column value changes, the checksum also changes. You can use this simple method to see if a table has changed very easily, however, beware, different column values may generate the same checksum. Here's the SQL: -- table checksum SELECT CHECKSUM_AGG(BINARY_CHECKSUM(*)) FROM TableName -- column checksum SELECT CHECKSUM_AGG(BINARY_CHECKSUM(ColumnName)) FROM TableName -- integer column checksum SELECT CHECKSUM_AGG(IntegerColumnName) FROM TableName Here are the reference links on the CHECKSUM, CHECKSUM_AGG and BINARY_CHECKSUM functions: CHECKSUM CHECKSUM_AGG BINARY_CHECKSUM SyntaxHighlighter.config.clipboardSwf = 'http://alexgorbatchev.com/pub/sh/2.0.320/scripts/clipboard.swf'; SyntaxHighlighter.brushes.Xml.aliases = ['xml']; SyntaxHighlighter.all();

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• Guaranteed Restore Points as Fallback Method

  - by Mike Dietrich

  Thanks to the great audience yesterday in the Upgrade & Migration Workshop in Utrecht. That was really fun and I was amazed by our new facilities (and the  "wellness" lights surrounding the plenum room's walls). And another reason why I like to do these workshops is that often I learn new things from you So credits here to Rick van  Ek who has highlighted the following topic to me. Yesterday (and in some previous workshops) I did mention during the discussion about Fallback Strategies that you'll have to switch on Flashback Database beforehand to create a guaranteed restore point in case you'll encounter an issue during the database upgrade. I knew that we've made it possible since Oracle Database 11.2 to switch Flashback Database on without taking the database into MOUNT status (you could switch it off anyway while the database is open before in all releases). But before Oracle Database 11.2 that did require MOUNT status. SQL> create restore point rp1 guarantee flashback database ; create restore point rp1 guarantee flashback database * ERROR at line 1: ORA-38784: Cannot create restore point 'RP1'. ORA-38787: Creating the first guaranteed restore point requires mount mode when flashback database is off. But Rick did mention that I won't need to switch Flashback Database On to create a guaranteed restore point. And he's right - in older releases I would have had to go into MOUNT state to define the restore point which meant to restart the database. But in 11.2 that's no necessary anymore. And the same will apply when you upgrade your pre-11.2 database (e.g. an Oracle Database 10.2.0.4) to Oracle Database 11.2. As soon as you start your "old" not-yet-upgraded database in your 11.2 environment with STARTUP UPGRADE you can define a guaranteed restore point. If you tail the alert.log you'll see that the database will start the RVWR (Recovery Writer) background process - you'll just have to make sure that you'd define the values for db_recovery_file_dest_size and db_recovery_file_dest. SQL> startup upgrade ORACLE instance started. Total System Global Area  417546240 bytes Fixed Size                  2228944 bytes Variable Size             134221104 bytes Database Buffers          272629760 bytes Redo Buffers                8466432 bytes Database mounted. Database opened. SQL> create restore point grpt guarantee flashback database; Restore point created.SQL> drop restore point grpt; And don't forget to drop that restore point the sooner or later as it is guaranteed - and will fill up your Fast Recovery Area pretty quickly Just on the side: in any case archivelog mode is required if you'd like to work with restore points. - Mike

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• Speaking this week at Richmond SQL Server User Group

  - by drsql

  Thursday night, at 6:00 (or so) I will be speaking in Richmond ( http://richmondsql.org/cs2007/ ), talking about How to Implement a Hierarchy using SQL Server. The abstract is: One of the most common structures you will come across in the real world is a hierarchy (either a single parent "tree" or a multi-parent "graph"). Many systems will implement the obvious examples, such as a corporate managerial structure or a bill of materials. It turns out that almost any many-to-many relationship can be...(read more)

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• How to switch from developer to dba? [on hold]

  - by lamwaiman1988

  I am working as a developer for 3 years and I am thinking of switch to dba. I do not own any certificate nor received any training regarding the daily job of dba. My company also do not offer any chance of work/training related to a dba. If I want to be a dba ( because of the salary and a much stable job than developer ), should I go to get some oracle certificates? I've also heard that you can't be a good dba if you cannot get a good understanding about the working OS such as windows/unix ( and to do that you also need to get some certificate on windows administration or unix administration ) but they recommend book of Rich Stevens over certificate. I am confused on what should I do to make this happen.

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• Persisting natural language processing parsed data

  - by tjb1982

  I've recently started experimenting with natural language processing (NLP) using Stanford's CoreNLP, and I'm wondering what are some of the standard ways to store NLP parsed data for something like a text mining application? One way I thought might be interesting is to store the children as an adjacency list and make good use of recursive queries (Postgres supports this and I've found it works really well). But I assume there are probably many standard ways to do this depending on what kind of analysis is being done that have been adopted by people working in the field over the years. So what are the standard persistence strategies for NLP parsed data and how are they used?

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• Internal message system with SQL database

  - by laurens

  Hi all, I was asked to install a -rather basic- Internal message system with SQL database we could integrate with our websites. A user is logged onto the website and should then be able to go to its Inbox or outbox; of course they should be able to sent to other users. Important: It's not a smtp/pop mailserver system I'm looking for! I found something with similar functionalities with an access DB (also a possibility) http://www.planet-source-code.com/vb/scripts/ShowCode.asp?lngWId=4&txtCodeId=6859 Thanks in advance!

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• Any way to program a system which automatically restores home / sql database

  - by Mirage

  I have made two shell scripts Script 1: It does all Home directory backups with name username_home_date.tar.gz Script 2: It does SQL backups of all sites every 3 hrs. username_databse_date.sql.gz Now currently if I want to restore the site, I have to copy the tar file to /home/username and then untar there with all the permissions as well and then manually import the database. Is there any way (for instance a program, system or script) that I can just select which backup I want to restore and do automatically? Maybe like a cPanel addon thing.

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• Install postgresql. Why is initdb unavailable?

  - by Starkers

  I'm following these instructions, however I can only get to step 17.2. Despite installing postgresql successfully via the sudo apt-get install postgresql command, upon running initdb -D /usr/local/pgsql/data Ubuntu tells me that it 'initdb' isn't installed. The instructions tell me this command is installed by sudo apt-get install postgresql so what's going on? I can make initdb available by installing postgres-xc, but I think postgres-xc is just some weird third party rubbish, and it's not detailed in the instructions. Any ideas?

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• keeping connection open all time in sql

  - by Costi

  I have developed a Windows application in c# in which multiple users can add some numbers and their name and can view the data entered. The problem that I have is that the sever is on my laptop and every time I log off or close my laptop, they are losing connection to the DB and can not add or view any more. It seems that the port is closed or something. Is there a way to keep the port and their connection established all the time even when I'm logging out?

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• Determine Server specs for a Rails with MySQL database (on AWS)

  - by Rogier

  I developed a intranet applications with Rails (3.2) for one of my customers. There will be around 30-40 employees working with it. Backend is MySQL (5). What would be the best way to determine the servers specs needed? Given: max. load will be roughly 2400 (40*60) HTTP requests (mixed GET / POST) per hour. 15% of these calls are JSON calls (iOS) avg request will make between 5-10 database calls 500-800 SQL INSERTS per day webpages are fairly simple (no images, just text) avg webpage is 15 request (css/js/etc) and total size is 35-45 KB More specific, since they need access from multiple geographical locations, we are thinking of running a bitnami Ruby stack in the AWS cloud (uptime is important). Any thoughts on a AWS Instance (small/medium) and Utilization (light/medium/heavy) ? Thanks!

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• TechEd 2010 Followup

  - by AllenMWhite

  Last week I presented a couple of sessions at Tech Ed NA in New Orleans. It was a great experience, even though my demos didn't always work out as planned. Here are the sessions I presented: DAT01-INT Administrative Demo-Fest for SQL Server 2008 SQL Server 2008 provides a wealth of features aimed at the DBA. In this demofest of features we'll see ways to make administering SQL Server easier and faster such as Centralized Data Management, Performance Data Warehouse, Resource Governor, Backup Compression...(read more)

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• Implementing set of processes in a stored procedure or through the code?

  - by just_name

  I want to know what's the suitable method to implement the following case (best practice). If i make a set of processes like this : 1- select data from set of DB tables. 2- loop on the selected result . 3- Make some checks on each iteration . 4- Insert the result in another table . Implementing the previous steps in a stored procedure or in a transaction through my code (asp.net) . ? Concerning the performance , security and reliability issues .

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• How to migrate an SQLServer 2000 database from one machine to another

  - by Saiyine

  This January I'm migrating our main SQLServer 2000 based database to a beefier server. Is there any standard procedure or documentation on how to do it? I need to replicate all at the new server (databases, jobs, DTSs, vinculated servers, etc). Edit: I mean SQLServer 2000 on both ends! Edit: Be calm, people, I just crossed the versions from another software I posted about at the same time as this. Effectively, I even checked the wikipedia to be sure version 8 was 2000. Don't need to flame that much about what is just an errata.

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• Connect to MySQL EC2 Instance outside of VPC

  - by Brian W

  I have a VPC setup with a few EC2 instances inside. I'm attempting to connect to a MySQL database on an EC2 instance outside the VPC, with no luck. I have the security groups on the VPC EC2 instances set to outbound 0.0.0.0/0 which I assumed would let it connect to any outbound connection. I also followed a tutorial on creating a NAT, but wasn't exactly sure how to use it to connect to an external database. In any case, if anyone has experience and knows the proper way to connect to a database outside the VPC, it would be greatly appreciated!

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• What is the increase in developer productivity while using Hibernate?

  - by Tarun Kohli

  I was curious to find out the percentage increase in developer's productivity by using Hibernate. We use both Hibernate and NHibernate extensively and find them to be extremely elegant frameworks but haven't undertaken any study to find out the time savings by using them. IMHO, one could get a good 30 to 40% jump in developer productivity as one doesn't have to write the basic CRUD operations and bother about caching. But, are there are any formal case studies which prove that point? I would really appreciate if someone could direct me to a published white paper about some statistics about the productivity gains.

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• TDD with SQL and data manipulation functions

  - by Xophmeister

  While I'm a professional programmer, I've never been formally trained in software engineering. As I'm frequently visiting here and SO, I've noticed a trend for writing unit tests whenever possible and, as my software gets more complex and sophisticated, I see automated testing as a good idea in aiding debugging. However, most of my work involves writing complex SQL and then processing the output in some way. How would you write a test to ensure your SQL was returning the correct data, for example? Then, say if the data wasn't under your control (e.g., that of a 3rd party system), how can you efficiently test your processing routines without having to hand write reams of dummy data? The best solution I can think of is making views of the data that, together, cover most cases. I can then join those views with my SQL to see if it's returning the correct records and manually process the views to see if my functions, etc. are doing what they're supposed to. Still, it seems excessive and flakey; particularly finding data to test against...

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