2
votes
1answer
479 views

3NF decomposition + database normalization

I am studying for a test and would like to know if I am on the right track to get the following into 3NF with minimal number of keys for R: Given relation R(A,B,C,D,E,F,G) and the functional ...
0
votes
1answer
970 views

WorkAround for PHP PDO(with libpq V 9.1.4) binding for use of CITEXT?

The scenario Two systems(not server) running PHP and PostgreSQL with the following versions Fedora 15: PHP PHP 5.3.13 (cli) (built: May 9 2012 14:38:35) Copyright (c) 1997-2012 The ...
2
votes
1answer
3k views

How to convert execution time to a specific format?

I am working on a report that allows people to print off data for physical signatures. Part of the requirement is to format the exectuion date in the format DDMONYY (27Aug12). I can not find a way ...
0
votes
2answers
535 views

Convert datetime to europe default without time

I have a datetime field that I need to convert into the format DDMONYY (27Aug12). I am currently using convert(nvarchar(30),DateToConvert,13), but that also spits out the time. How can I easily ...
4
votes
1answer
8k views

How To Optimize and Repair InnoDB tables? ALTER and OPTIMIZE table failed

I just switched my Wordpress databases to use the InnoDB engine. When using MyISAM, I used to run Optimize and Repair table. However, with InnoDB, these don't work. I manually ran OPTIMIZE TABLE ...
7
votes
2answers
471 views

Data Compression Through Base36 Encoding

I'm trying to store a lot of large numbers that truncate when stored as INT values. Unfortunately they are too large for this type. I'm thinking about using Base36 encoding to accomplish this. Are ...
4
votes
1answer
4k views

T-SQL: Convert XML to string without self-closing tags

We have a weirdo system we're integrating with which consumes XML, but it does not understand self-closing tags, so <BOOKING> <BOOKINGID>56812</BOOKINGID> <PERSONCODE /> ...
0
votes
2answers
1k views

configure remote connection for multiple instances sql server 2008

I've installed 2 instances of SQL Server 2008 R2 onto our local windows server. For the purposes of testing I've turned off the firewall. I'll get the firewall back up after I manage a successfull ...
6
votes
2answers
610 views

Performance tuning for gap analysis of table

I have a table which stores the sequence (counter) of data received from devices out in the field. At any rate, these sequences need to be in order within a configurable time span, but can come into ...
4
votes
1answer
3k views

Proper tuning for 30GB InnoDB table on server with 48GB RAM

I have a 30GB 15M rows InnoDB MySQL 5.5.15 table. It is running on a server with many other MyISAM tables (300GB db). The system has 48GB RAM. Besides the default configurations, I've changed the ...
5
votes
2answers
1k views

Vehicle spare parts inventory datadase model

I am modeling a database to be used for vehicle spare parts inventory management and I am stuck... Some spare parts can be broken down from a kit into component parts. I would like to create a model ...
1
vote
1answer
7k views

MySQL trigger - delete data from multiple tables

I would like to delete data in multiple tables, from a trigger but it seem like my syntax is incorrect. I got the error: "you've got a error in your MySQL syntax please check the manual". This ...
2
votes
2answers
3k views

Querying a database efficiently for a huge chunk of data

Here is my query SELECT * FROM ( SELECT a.*, rownum rnum FROM ( SELECT id, data FROM t ORDER BY id ) a ...
1
vote
1answer
255 views

Size of an empty database

Continuing with my school-project, now I have to estimate the size of the database from here to 5 years. They give me a formula, so, in that formula, one of the values is the size of the empty ...
0
votes
2answers
1k views

Secure way to connect: Windows Authentication or SQL Server Authentication and why?

Which is the best way to create a connection string for SQL Server? Should I be using a trusted connection string (windows authentication) or an untrusted connection string (sql server ...
7
votes
2answers
268 views

High rise in SQL Server CPU after adding a DB

I have just added a "new" DB to my Server (2005), I have restored from a dead SQL2000 server to my active one (2005), and changed the compatibility to 90 (SQL Server 2005). My average CPU was on 48% ...
6
votes
2answers
404 views

Correlated subquery and join: still the same exectution plan?

I have a correlated subquery like this (from BOL): SELECT DISTINCT c.LastName, c.FirstName, e.BusinessEntityID FROM Person.Person AS c JOIN HumanResources.Employee AS e ON e.BusinessEntityID = ...
2
votes
1answer
413 views

MySQL table locks solution -> InnoDb / Partitions

I'm experiencing many table locks in a MyISAM MySQL table that is pretty big (Constx10xGB and 15M rows). It's mainly caused due many heavy inserts. My current thoughts to optimize: Changing to ...
1
vote
1answer
392 views

MySQL table locks solution -> InnoDb / Partitions

I'm experiencing many table locks in a MyISAM MySQL table that is pretty big (Constx10xGB and 15M rows). It's mainly caused due many heavy inserts. My current thoughts to optimize: Changing to ...
3
votes
1answer
412 views

DB2 Express-C 10.1 database move to DB2 Work group Server/Enterprise Edition

I have not done such migration before and I want to know if I am going to face such issues when moving my database (tables,views,table-spaces,functions,procedures,etc.) to other DB2 distribution. If ...
3
votes
1answer
1k views

How far should bind variables go in Oracle?

I am currently examining all database users's SQL code in our department for not using bind variables. We do experience an ORA-04031 error within a constant period of time. Now, I have a quite firm ...
-1
votes
1answer
312 views

Database for an application similar to Chatroulette

I am making an app that is similar to Chatroulette. When a user starts the app it finds someone that is not currently talking to anyone and have them talk to each other. At any point a user could ...
4
votes
2answers
9k views

Estimate a Database Size

I have to do some project, and need to estimate the DB size. I'm gonna to use Oracle in the project, because will have a lot of transactions and size. But in the "presentation" I need to specify, in 5 ...
0
votes
1answer
2k views

Unable to select the records from specific partition in mysql?

I've created a table using the following query, CREATE TABLE employees ( id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, fname VARCHAR(25) NOT NULL, lname VARCHAR(25) NOT NULL, store_id ...
3
votes
2answers
2k views

Sub-query executes 1 time for a parent query or more?

If i apply a static data in where clause is it faster then applying a sub-query. Example: (The query returns 5 records as a result set) SELECT STARTDATE, ENDDATE FROM TEST WHERE STARTDATE = ...
2
votes
2answers
2k views

MySQL cluster - how many hosts are needed for full HA?

I need some clarification on MySQL-Cluster (NDB) setup I want to achieve full HA but I'm low on server budget and can't afford to rent a dozen of servers for simple solution that I'm working on. ...
0
votes
2answers
2k views

xp_cmdshell bcp wont save file

EXEC xp_cmdshell 'bcp "SELECT lastconnectip FROM RF_USER.dbo.tbl_UserAccount" queryout "C:\test.txt" -T -c' The command above runs, the output: NULL Starting copy... 1000 rows successfully ...
3
votes
1answer
3k views

How to disable case sensitivity in SQL Server 2005 for object name (Table name)?

I have created a new database in SQL Server 2005 and execute generated script from the old database. In that I have a table called MstCity When I try to execute the following query which has the ...
10
votes
4answers
4k views

Benefits of using backtick (`) in MySQL queries?

In MySQL we can create queries with or without the backtick (`) symbol. Example: SELECT * FROM TEST; SELECT * FROM `TEST`; Both works fine in mysql-console. Is there any technical difference ...
3
votes
2answers
9k views

Why database diagrams are not working when domain account is attached to database owner?

I was trying to use Database diagrams is SQL Server and got following error: Database diagram support objects cannot be installed because this database does not have a valid owner. To continue, first ...
4
votes
4answers
10k views

What's better/faster? MySql or FileSystem?

Let's imagine a web site that is a directory of people. For each person there may be a profile photo and a biography. I'll admit my SQL queries could be better but in general what would be faster and ...
2
votes
1answer
347 views

Schema for 1 <-> 0..1(+), many related but only one primary

Using tools available in SQL Server 2008 and Entity Framework, what is a solid way to represent a one-to-many relationship, where there is an underlying unique relation that I need to enforce? My ...
1
vote
1answer
308 views

SQL Server 2008 R2 - Weekly / Monthly Statistics

I'm new working with SQL Server 2008 R2 Express, and I´d like to gather some statistics every week / month for users who are connecting to this server. For instance, how many times they were ...
2
votes
0answers
106 views

SQL Server and updating windows firewall rules

Any ideas how should I proceed if I would like to update the firewall rules (essentially add ip-s to existing firewall rule). The step of exporting ip-s to text file and then using command line to ...
4
votes
1answer
201 views

SQL Server Mirroring kicks in before cluster has time to fail over

I have two clusters each with two nodes configured in active/passive; the two clusters take part in a high-availability mirroring session using a separate server as the witness. When a node fails in ...
1
vote
1answer
1k views

DynamoDB: searching with primary key or range key, which way is faster?

To those familiar with DynamoDB, I'm trying to make a table where items only have 2 entries. For example, . Most of the time I'll be searching the user_id with a facebook_id on hand. Amazon's ...
2
votes
1answer
209 views

SSMS Object Explorer Details causes deadlock while job is running

I have a problem with one of my SQL Server jobs. I've found that while the job is running, SQL Server Management Studio locks up. It always locks up while I'm looking at tables and sprocs within the ...
2
votes
1answer
2k views

SQL Server trigger (update or insert with inner join problem)

ALTER TRIGGER [dbo].[killertrigg] ON [dbo].[tbl_pvporderview] AFTER UPDATE AS IF (UPDATE([Kill])) BEGIN SET NOCOUNT ON; INSERT killer(serial,[Kill]) SELECT i.serial,i.[Kill] FROM ...
1
vote
1answer
1k views

Foreign key constraints failures

Given the following tables: CREATE TABLE `longdescs` ( `comment_id` int(11) NOT NULL AUTO_INCREMENT, `bug_id` mediumint(9) NOT NULL, `who` mediumint(9) NOT NULL, `bug_when` datetime NOT NULL, ...
3
votes
4answers
8k views

Is it possible to get SQL Server 2008 to download a file from a URL

I have a set of XML based services running on my network. The data in these services needs to be mirrored into a Table on an SQL Server 2008 instance. Getting the XML into a table is no problem I ...
2
votes
0answers
268 views

Strugling with updating a cassandra row in FluentCassandra

I have this problem with using Fluent Cassandra in a test application. All I want to do is set the IsOnline field to true inside the SignIn method, but I keep getting the exception supercolumn ...
0
votes
2answers
10k views

How to print out the query SQL text of a transaction by querying the “fn_dblog” or DBCC LOG('DataBaseName')?

At some point in the last 24 hours some changes were made to a customer SQL server 2008 (v 9.0 SP4) by one of a couple if possible applications that use the DB. Its not particular critical, but it ...
-2
votes
4answers
5k views

How can place SQL Server online on the internet?

I need some help i am working on a project and need to deploy my application which currently has a database running on SQL Server 2008 and my software is developed in VB.Net, The client needs to ...
0
votes
1answer
2k views

MySQL 5.5 not starting after master-master configuration

The following master-master configuration worked on MySQL Server 5.1.x(Ubuntu 10.04). Master1(192.168.2.80) ################################## #MySQL Replication ################################## ...
2
votes
2answers
289 views

How can I test sql scripts intended to run with sqlcmd -v in Sql Server Management Studio

From msdn I learn, that the Variable Precedence of :Setvar X Y is higher, than that of sqlcmd -v X=Y. I want to write a script, that uses the variables supplied to sqlcmd with the -v option, but ...
4
votes
2answers
1k views

Pros and Cons of virtualisation technology for database-server and datastorage

Yesterday we had a chat about performance and restorability and I realized how many good things a virtualisation environment can bring to me - but as I'm a little sceptic concerning performance I'm ...
6
votes
3answers
14k views

How to make multiple counts in one query?

I count records with queries like SELECT COUNT(col1) FROM table1 WHERE col1 LIKE '%something%' SELECT COUNT(col1) FROM table1 WHERE col1 LIKE '%another%' SELECT COUNT(col1) FROM table1 WHERE col1 ...
1
vote
1answer
710 views

Can the default minimum date range for 'datetime' be changed in SQL Server 2008 R2?

The minimum date range is set to somewhere in the 1750's. I need to store dates prior to 1750. One solution that came to mind is to store the dates in a particular format in a 'varchar' field, and ...
5
votes
2answers
468 views

Determining the optimal Column Widths from a .csv File

I want to import a .CSV file into a MySQL Table. I would like to determine the optimal column widths to use based on the actual data contained in the CSV file. Are there any scripts or utilities to ...
1
vote
1answer
206 views

What's the fastest way to replicate data?

I have a mongodb database data on my computer. I want to upload that into amazon.com server. The bottle neck is the internet connection. One way is to zip the file and then upload it to the server. ...

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